Search results
Search for "one-pot three-component reaction" in Full Text gives 24 result(s) in Beilstein Journal of Organic Chemistry.
Synthesis of novel alkynyl imidazopyridinyl selenides: copper-catalyzed tandem selenation of selenium with 2-arylimidazo[1,2-a]pyridines and terminal alkynes
- Mio Matsumura,
- Kaho Tsukada,
- Kiwa Sugimoto,
- Yuki Murata and
- Shuji Yasuike
Beilstein J. Org. Chem. 2022, 18, 863–871, doi:10.3762/bjoc.18.87
- attention [15][19][20][21][22][23][24][25][26]. This method involves a transition-metal-catalyzed one-pot, three-component reaction in which two functional groups are simultaneously introduced on the Se atom via double selenation. As examples, the following Cu-catalyzed one-pot reactions have been reported
Graphical Abstract
Figure 1: Biologically active selenides having alkynyl or imidazopyridinyl groups.
Figure 2: (a) ORTEP drawing of 4aa and (b) its stacking structure.
Scheme 1: Control reactions.
Figure 3: Proposed mechanism.
Scheme 2: Transformation from 4aa.
Bifunctional thiourea-catalyzed asymmetric [3 + 2] annulation reactions of 2-isothiocyanato-1-indanones with barbiturate-based olefins
- Jiang-Song Zhai and
- Da-Ming Du
Beilstein J. Org. Chem. 2022, 18, 25–36, doi:10.3762/bjoc.18.3
- through a gram-scale synthesis, one-pot three-component reactions and further transformation experiments of the products. Keywords: asymmetric catalysis; cyclization reaction; Michael addition; one-pot three-component reaction; spirobarbiturates; Introduction Indane scaffolds exist in various
- % ee) could still be maintained (Scheme 6b). This one-pot three-component reaction would be more convenient for potential industrial applications. Finally, in order to understand the enantioselective formation process of product 3, we proposed the possible mechanisms for the [3 + 2] cyclization
- residue was purified by flash column chromatography on silica gel (petroleum ether/ethyl acetate 4:1) to give pure compound 5 as white solid (44.0 mg, 95% yield). 6. One-pot three-component reaction for the synthesis of 3aa 1,3-Dimethylpyrimidine-2,4,6(1H,3H,5H)-trione (15.6 mg, 0.10 mmol) and
Graphical Abstract
Figure 1: Selected examples of natural products and drugs possessing the indane scaffold.
Scheme 1: Known strategies and conceptual advance of this contribution.
Figure 2: Selected examples of bioactive spirobarbiturates.
Figure 3: The screened organocatalysts.
Scheme 2: Substrate scope of 2-isothiocyanato-1-indanones. The reactions were carried out with 1 (0.12 mmol), ...
Scheme 3: Substrate scope of barbiturate-based olefins. The reactions were carried out with 1a (0.12 mmol), 2...
Figure 4: X-ray crystal structure of 3ae (displacement ellipsoids are drawn at the 50% probability level).
Scheme 4: Gram-scale synthesis of 3ah.
Scheme 5: Further transformation of 3ah.
Scheme 6: One-pot three-component reaction.
Scheme 7: Proposed reaction mechanism.
Microwave-assisted multicomponent reactions in heterocyclic chemistry and mechanistic aspects
- Shivani Gulati,
- Stephy Elza John and
- Nagula Shankaraiah
Beilstein J. Org. Chem. 2021, 17, 819–865, doi:10.3762/bjoc.17.71
- min in the absence of TMSCl. This indicates the importance of microwave in the construction of such pharmacologically relevant molecules under benign conditions. Similarly, the same group [100] explored an one-pot three-component reaction involving cyanamide (110), 2-amino-4-phenylimidazole 114 and
Graphical Abstract
Figure 1: Marketed drugs with acridine moiety.
Scheme 1: Synthesis of 4-arylacridinediones.
Scheme 2: Proposed mechanism for acridinedione synthesis.
Scheme 3: Synthesis of tetrahydrodibenzoacridinones.
Scheme 4: Synthesis of naphthoacridines.
Scheme 5: Plausible mechanism for naphthoacridines.
Figure 2: Benzoazepines based potent molecules.
Scheme 6: Synthesis of azepinone.
Scheme 7: Proposed mechanism for azepinone formation.
Scheme 8: Synthesis of benzoazulenen-1-one derivatives.
Scheme 9: Proposed mechanism for benzoazulene-1-one synthesis.
Figure 3: Indole-containing pharmacologically active molecules.
Scheme 10: Synthesis of functionalized indoles.
Scheme 11: Plausible mechanism for the synthesis of functionalized indoles.
Scheme 12: Synthesis of spirooxindoles.
Scheme 13: Synthesis of substituted spirooxindoles.
Scheme 14: Plausible mechanism for the synthesis of substituted spirooxindoles.
Scheme 15: Synthesis of pyrrolidinyl spirooxindoles.
Scheme 16: Proposed mechanism for pyrrolidinyl spirooxindoles.
Figure 4: Pyran-containing biologically active molecules.
Scheme 17: Synthesis of functionalized benzopyrans.
Scheme 18: Plausible mechanism for synthesis of benzopyran.
Scheme 19: Synthesis of indoline-spiro-fused pyran derivatives.
Scheme 20: Proposed mechanism for indoline-spiro-fused pyran.
Scheme 21: Synthesis of substituted naphthopyrans.
Figure 5: Marketed drugs with pyrrole ring.
Scheme 22: Synthesis of tetra-substituted pyrroles.
Scheme 23: Mechanism for silica-supported PPA-SiO2-catalyzed pyrrole synthesis.
Scheme 24: Synthesis of pyrrolo[1,10]-phenanthrolines.
Scheme 25: Proposed mechanism for pyrrolo[1,10]-phenanthrolines.
Figure 6: Marketed drugs and molecules containing pyrimidine and pyrimidinones skeletons.
Scheme 26: MWA-MCR pyrimidinone synthesis.
Scheme 27: Two proposed mechanisms for pyrimidinone synthesis.
Scheme 28: MWA multicomponent synthesis of dihydropyrimidinones.
Scheme 29: Proposed mechanism for dihydropyrimidinones.
Figure 7: Biologically active fused pyrimidines.
Scheme 30: MWA- MCR for the synthesis of pyrrolo[2,3-d]pyrimidines.
Scheme 31: Proposed mechanism for pyrrolo[2,3-d]pyrimidines.
Scheme 32: Synthesis of substituted pyrrolo[2,3-d]pyrimidine-2,4-diones.
Scheme 33: Probable pathway for pyrrolo[2,3-d]pyrimidine-2,4-diones.
Scheme 34: Synthesis of pyridopyrimidines.
Scheme 35: Plausible mechanism for the synthesis of pyridopyrimidines.
Scheme 36: Synthesis of dihydropyridopyrimidine and dihydropyrazolopyridine.
Scheme 37: Proposed mechanism for the formation of dihydropyridopyrimidine.
Scheme 38: Synthesis of thiopyrano[4,3-d]pyrimidines.
Scheme 39: Plausible mechanism for the synthesis of thiopyrano[4,3-d]pyrimidines.
Scheme 40: Synthesis of decorated imidazopyrimidines.
Scheme 41: Proposed mechanism for imidazopyrimidine synthesis.
Figure 8: Pharmacologically active molecules containing purine bases.
Scheme 42: Synthesis of aza-adenines.
Scheme 43: Synthesis of 5-aza-7-deazapurines.
Scheme 44: Proposed mechanism for deazapurines synthesis.
Figure 9: Biologically active molecules containing pyridine moiety.
Scheme 45: Synthesis of steroidal pyridines.
Scheme 46: Proposed mechanism for steroidal pyridine.
Scheme 47: Synthesis of N-alkylated 2-pyridones.
Scheme 48: Two possible mechanisms for pyridone synthesis.
Scheme 49: Synthesis of pyridone derivatives.
Scheme 50: Postulated mechanism for synthesis of pyridone.
Figure 10: Biologically active fused pyridines.
Scheme 51: Benzimidazole-imidazo[1,2-a]pyridines synthesis.
Scheme 52: Mechanism for the synthesis of benzimidazole-imidazo[1,2-a]pyridines.
Scheme 53: Synthesis of pyrazolo[3,4-b]pyridine-5-spirocycloalkanedione derivatives.
Scheme 54: Proposed mechanism for spiro-pyridines.
Scheme 55: Functionalized macrocyclane-fused pyrazolo[3,4-b]pyridine derivatives.
Scheme 56: Mechanism postulated for macrocyclane-fused pyrazolo[3,4-b]pyridine.
Scheme 57: Generation of pyrazolo[3,4-b]pyridines.
Scheme 58: Proposed mechanism for the synthesis of pyrazolo[3,4-b]pyridines.
Scheme 59: Proposed mechanism for the synthesis of azepinoindole.
Figure 11: Pharmaceutically important molecules with quinoline moiety.
Scheme 60: Povarov-mediated quinoline synthesis.
Scheme 61: Proposed mechanism for Povarov reaction.
Scheme 62: Synthesis of pyrazoloquinoline.
Scheme 63: Plausible mechanism for pyrazoloquinoline synthesis.
Figure 12: Quinazolinones as pharmacologically significant scaffolds.
Scheme 64: Four-component reaction for dihydroquinazolinone.
Scheme 65: Proposed mechanism for dihydroquinazolinones.
Scheme 66: Synthesis purine quinazolinone and PI3K-δ inhibitor.
Scheme 67: Synthesis of fused benzothiazolo/benzoimidazoloquinazolinones.
Scheme 68: Proposed mechanism for fused benzothiazolo/benzoimidazoloquinazolinones.
Scheme 69: On-water reaction for synthesis of thiazoloquinazolinone.
Scheme 70: Proposed mechanism for the thiazoloquinazolinone synthesis.
Scheme 71: β-Cyclodextrin-mediated synthesis of indoloquinazolinediones.
Scheme 72: Proposed mechanism for synthesis of indoloquinazolinediones.
Figure 13: Triazoles-containing marketted drugs and pharmacologically active molecules.
Scheme 73: Cu(I) DAPTA-catalyzed 1,2,3-triazole formation.
Scheme 74: Mechanism for Cu(I) DAPTA-catalyzed triazole formation.
Scheme 75: Synthesis of β-hydroxy-1,2,3-triazole.
Scheme 76: Proposed mechanism for synthesis of β-hydroxy-1,2,3-triazoles.
Scheme 77: Synthesis of bis-1,2,4-triazoles.
Scheme 78: Proposed mechanism for bis-1,2,4-triazoles synthesis.
Figure 14: Thiazole containing drugs.
Scheme 79: Synthesis of a substituted thiazole ring.
Scheme 80: Synthesis of pyrazolothiazoles.
Figure 15: Chromene containing drugs.
Scheme 81: Magnetic nanocatalyst-mediated aminochromene synthesis.
Scheme 82: Proposed mechanism for the synthesis of chromenes.
Microwave-assisted efficient one-pot synthesis of N2-(tetrazol-5-yl)-6-aryl/heteroaryl-5,6-dihydro-1,3,5-triazine-2,4-diamines
- Moustafa Sherief Moustafa,
- Ramadan Ahmed Mekheimer,
- Saleh Mohammed Al-Mousawi,
- Mohamed Abd-Elmonem,
- Hesham El-Zorba,
- Afaf Mohamed Abdel Hameed,
- Tahany Mahmoud Mohamed and
- Kamal Usef Sadek
Beilstein J. Org. Chem. 2020, 16, 1706–1712, doi:10.3762/bjoc.16.142
- sample synthesized by a conventional method. Conclusion The synthesis of biologically relevant 6-aryl/heteroaryl-N2-(5H-tetrazole-5-yl)-5,6-dihydro-1,3,5-triazine-2,4-diamines was achieved under controlled microwave heating via a simple one-pot, three-component reaction of cyanamide 1, aldehydes 2, and 5
Graphical Abstract
Scheme 1: Previously reported methods for the synthesis of 1,3,5-triazine-2,4-diamine derivatives.
Scheme 2: One-pot synthesis of N2-(tetrazol-5-yl)-6-aryl/heteroaryl-5,6-dihydro-1,3,5-triazine-2,4-diamines 4a...
Figure 1: ORTEP diagram of compound 4i.
Scheme 3: Plausible different routes to account for the formation of products 4.
A systematic review on silica-, carbon-, and magnetic materials-supported copper species as efficient heterogeneous nanocatalysts in “click” reactions
- Pezhman Shiri and
- Jasem Aboonajmi
Beilstein J. Org. Chem. 2020, 16, 551–586, doi:10.3762/bjoc.16.52
Graphical Abstract
Scheme 1: Chemical structure of the catalysts 1a and 1b and their catalytic application in CuAAC reactions.
Scheme 2: Synthetic route to the catalyst 11 and its catalytic application in CuAAC reactions.
Scheme 3: Synthetic route of dendrons, illustrated using G2-AMP 23.
Scheme 4: The catalytic application of CuYAu–Gx-AAA–SBA-15 in a CuAAC reaction.
Scheme 5: Synthetic route to the catalyst 36.
Scheme 6: Application of the catalyst 36 in CuAAC reactions.
Scheme 7: The synthetic route to the catalyst 45 and catalytic application of 45 in “click” reactions.
Scheme 8: Synthetic route to the catalyst 48 and catalytic application of 48 in “click” reactions.
Scheme 9: Synthetic route to the catalyst 58 and catalytic application of 58 in “click” reactions.
Scheme 10: Synthetic route to the catalyst 64 and catalytic application of 64 in “click” reactions.
Scheme 11: Chemical structure of the catalyst 68 and catalytic application of 68 in “click” reactions.
Scheme 12: Chemical structure of the catalyst 69 and catalytic application of 69 in “click” reactions.
Scheme 13: Synthetic route to, and chemical structure of the catalyst 74.
Scheme 14: Application of the cayalyst 74 in “click” reactions.
Scheme 15: Synthetic route to, and chemical structure of the catalyst 78 and catalytic application of 78 in “c...
Scheme 16: Synthetic route to the catalyst 85.
Scheme 17: Application of the catalyst 85 in “click” reactions.
Scheme 18: Synthetic route to the catalyst 87 and catalytic application of 87 in “click” reactions.
Scheme 19: Chemical structure of the catalyst 88 and catalytic application of 88 in “click” reactions.
Scheme 20: Synthetic route to the catalyst 90 and catalytic application of 90 in “click” reactions.
Scheme 21: Synthetic route to the catalyst 96 and catalytic application of 96 in “click” reactions.
Scheme 22: Synthetic route to the catalyst 100 and catalytic application of 100 in “click” reactions.
Scheme 23: Synthetic route to the catalyst 102 and catalytic application of 23 in “click” reactions.
Scheme 24: Synthetic route to the catalysts 108–111.
Scheme 25: Catalytic application of 108–111 in “click” reactions.
Scheme 26: Synthetic route to the catalyst 121 and catalytic application of 121 in “click” reactions.
Scheme 27: Synthetic route to 125 and application of 125 in “click” reactions.
Scheme 28: Synthetic route to the catalyst 131 and catalytic application of 131 in “click” reactions.
Scheme 29: Synthetic route to the catalyst 136.
Scheme 30: Application of the catalyst 136 in “click” reactions.
Scheme 31: Synthetic route to the catalyst 141 and catalytic application of 141 in “click” reactions.
Scheme 32: Synthetic route to the catalyst 144 and catalytic application of 144 in “click” reactions.
Scheme 33: Synthetic route to the catalyst 149 and catalytic application of 149 in “click” reactions.
Scheme 34: Synthetic route to the catalyst 153 and catalytic application of 153 in “click” reactions.
Scheme 35: Synthetic route to the catalyst 155 and catalytic application of 155 in “click” reactions.
Scheme 36: Synthetic route to the catalyst 157 and catalytic application of 157 in “click” reactions.
Scheme 37: Synthetic route to the catalyst 162.
Scheme 38: Application of the catalyst 162 in “click” reactions.
Scheme 39: Synthetic route to the catalyst 167 and catalytic application of 167 in “click” reactions.
Scheme 40: Synthetic route to the catalyst 169 and catalytic application of 169 in “click” reactions.
Scheme 41: Synthetic route to the catalyst 172.
Scheme 42: Application of the catalyst 172 in “click” reactions.
Rapid, two-pot procedure for the synthesis of dihydropyridinones; total synthesis of aza-goniothalamin
- Thomas J. Cogswell,
- Craig S. Donald and
- Rodolfo Marquez
Beilstein J. Org. Chem. 2020, 16, 135–139, doi:10.3762/bjoc.16.15
- and co-workers, who developed a one-pot, three-component reaction to produce protected homoallylic amines 4 (Scheme 1) [19]. It was reasoned that adaptation of the Veenstra protocol would allow us to introduce a second alkene unit during the same process, thus generating a ring-closing metathesis
Graphical Abstract
Figure 1: Aza-goniothalamin 1, (R)-(+)-goniothalamin 2 and acylated aza-goniothalamin analogue 3 [14-18].
Scheme 1: One pot synthesis of benzyl carbamate 4 reported by Veenstra and co-workers [19].
Scheme 2: Formation of diene 5 in 66% through a one pot, three component coupling.
Scheme 3: Optimized conditions for the synthesis of diene 5.
Scheme 4: Ring-closing metathesis reaction of diene 5 to yield dihydropyridone 7 [20-23].
Figure 2: Extension of the two-pot methodology to include a variety of different aldehyde starting materials.
Scheme 5: Total synthesis of aza-goniothalamin 1.
One-pot synthesis of substituted pyrrolo[3,4-b]pyridine-4,5-diones based on the reaction of N-(1-(4-hydroxy-6-methyl-2-oxo-2H-pyran-3-yl)-2-oxo-2-arylethyl)acetamide with amines
- Valeriya G. Melekhina,
- Andrey N. Komogortsev,
- Boris V. Lichitsky,
- Vitaly S. Mityanov,
- Artem N. Fakhrutdinov,
- Arkady A. Dudinov,
- Vasily A. Migulin,
- Yulia V. Nelyubina,
- Elizaveta K. Melnikova and
- Michail M. Krayushkin
Beilstein J. Org. Chem. 2019, 15, 2840–2846, doi:10.3762/bjoc.15.277
- amines 3 did not only furnish the desired scaffolds in satisfactory yields but also allowed to use a variety of readily available substituted substrates (Scheme 1). Results and Discussion The published synthesis of acetamides 2 includes a one-pot three-component reaction of 4-hydroxy-6-methyl-2H-pyran-2
Graphical Abstract
Scheme 1: General synthetic pathway to 1.
Scheme 2: Synthesis of acetamides 2.
Scheme 3: Possible reaction pathways for the formation of enaminone 7.
Scheme 4: Possible reaction pathways for the formation of pyrrolo[3,4-b]pyridin-5-one derivatives 1.
Figure 1: View of the structure of 1e in the crystal (CCDC: 1921613). Thermal ellipsoids indicate 50% probabi...
Scheme 5: Tautomeric equilibrium of pyrrolo[3,4-b]pyridin-5-one derivatives 1 in solution.
Recent advances on the transition-metal-catalyzed synthesis of imidazopyridines: an updated coverage
- Gagandeep Kour Reen,
- Ashok Kumar and
- Pratibha Sharma
Beilstein J. Org. Chem. 2019, 15, 1612–1704, doi:10.3762/bjoc.15.165
- reaction (2-CR) by using 2-AP and chalcone 146 (Scheme 52) and another by using a one-pot three-component reaction (3-CR) of 2-AP, aldehydes, and ketones (without the isolation of chalcone) (Scheme 53). The method has utilized a mixed solvent system comprising of Cl2CHCHCl2 (1,1,2,2-tetrachloroethane) and
Graphical Abstract
Figure 1: Various drugs having IP nucleus.
Figure 2: Participation percentage of various TMs for the syntheses of IPs.
Scheme 1: CuI–NaHSO4·SiO2-catalyzed synthesis of imidazo[1,2-a]pyridines.
Scheme 2: Experimental examination of reaction conditions.
Scheme 3: One-pot tandem reaction for the synthesis of 2-haloimidazopyridines.
Scheme 4: Mechanistic scheme for the synthesis of 2-haloimidazopyridine.
Scheme 5: Copper-MOF-catalyzed three-component reaction (3-CR) for imidazo[1,2-a]pyridines.
Scheme 6: Mechanism for copper-MOF-driven synthesis.
Scheme 7: Heterogeneous synthesis via titania-supported CuCl2.
Scheme 8: Mechanism involving oxidative C–H functionalization.
Scheme 9: Heterogeneous synthesis of IPs.
Scheme 10: One-pot regiospecific synthesis of imidazo[1,2-a]pyridines.
Scheme 11: Vinyl azide as an unprecedented substrate for imidazo[1,2-a]pyridines.
Scheme 12: Radical pathway.
Scheme 13: Cu(I)-catalyzed transannulation approach for imidazo[1,5-a]pyridines.
Scheme 14: Plausible radical pathway for the synthesis of imidazo[1,5-a]pyridines.
Scheme 15: A solvent-free domino reaction for imidazo[1,2-a]pyridines.
Scheme 16: Cu-NPs-mediated synthesis of imidazo[1,2-a]pyridines.
Scheme 17: CuI-catalyzed synthesis of isoxazolylimidazo[1,2-a]pyridines.
Scheme 18: Functionalization of 4-bromo derivative via Sonogashira coupling reaction.
Scheme 19: A plausible reaction pathway.
Scheme 20: Cu(I)-catalyzed intramolecular oxidative C–H amidation reaction.
Scheme 21: One-pot synthetic reaction for imidazo[1,2-a]pyridine.
Scheme 22: Plausible reaction mechanism.
Scheme 23: Cu(OAc)2-promoted synthesis of imidazo[1,2-a]pyridines.
Scheme 24: Mechanism for aminomethylation/cycloisomerization of propiolates with imines.
Scheme 25: Three-component synthesis of imidazo[1,2-a]pyridines.
Figure 3: Scope of pyridin-2(1H)-ones and acetophenones.
Scheme 26: CuO NPS-promoted A3 coupling reaction.
Scheme 27: Cu(II)-catalyzed C–N bond formation reaction.
Scheme 28: Mechanism involving Chan–Lam/Ullmann coupling.
Scheme 29: Synthesis of formyl-substituted imidazo[1,2-a]pyridines.
Scheme 30: A tandem sp3 C–H amination reaction.
Scheme 31: Probable mechanistic approach.
Scheme 32: Dual catalytic system for imidazo[1,2-a]pyridines.
Scheme 33: Tentative mechanism.
Scheme 34: CuO/CuAl2O4/ᴅ-glucose-promoted 3-CCR.
Scheme 35: A tandem CuOx/OMS-2-based synthetic strategy.
Figure 4: Biomimetic catalytic oxidation in the presence of electron-transfer mediators (ETMs).
Scheme 36: Control experiment.
Scheme 37: Copper-catalyzed C(sp3)–H aminatin reaction.
Scheme 38: Reaction of secondary amines.
Scheme 39: Probable mechanistic pathway.
Scheme 40: Coupling reaction of α-azidoketones.
Scheme 41: Probable pathway.
Scheme 42: Probable mechanism with free energy calculations.
Scheme 43: MCR for cyanated IP synthesis.
Scheme 44: Substrate scope for the reaction.
Scheme 45: Reaction mechanism.
Scheme 46: Probable mechanistic pathway for Cu/ZnAl2O4-catalyzed reaction.
Scheme 47: Copper-catalyzed double oxidative C–H amination reaction.
Scheme 48: Application towards different coupling reactions.
Scheme 49: Reaction mechanism.
Scheme 50: Condensation–cyclization approach for the synthesis of 1,3-diarylated imidazo[1,5-a]pyridines.
Scheme 51: Optimized reaction conditions.
Scheme 52: One-pot 2-CR.
Scheme 53: One-pot 3-CR without the isolation of chalcone.
Scheme 54: Copper–Pybox-catalyzed cyclization reaction.
Scheme 55: Mechanistic pathway catalyzed by Cu–Pybox complex.
Scheme 56: Cu(II)-promoted C(sp3)-H amination reaction.
Scheme 57: Wider substrate applicability for the reaction.
Scheme 58: Plausible reaction mechanism.
Scheme 59: CuI assisted C–N cross-coupling reaction.
Scheme 60: Probable reaction mechanism involving sp3 C–H amination.
Scheme 61: One-pot MCR-catalyzed by CoFe2O4/CNT-Cu.
Scheme 62: Mechanistic pathway.
Scheme 63: Synthetic scheme for 3-nitroimidazo[1,2-a]pyridines.
Scheme 64: Plausible mechanism for CuBr-catalyzed reaction.
Scheme 65: Regioselective synthesis of halo-substituted imidazo[1,2-a]pyridines.
Scheme 66: Synthesis of 2-phenylimidazo[1,2-a]pyridines.
Scheme 67: Synthesis of diarylated compounds.
Scheme 68: CuBr2-mediated one-pot two-component oxidative coupling reaction.
Scheme 69: Decarboxylative cyclization route to synthesize 1,3-diarylimidazo[1,5-a]pyridines.
Scheme 70: Mechanistic pathway.
Scheme 71: C–H functionalization reaction of enamines to produce diversified heterocycles.
Scheme 72: A plausible mechanism.
Scheme 73: CuI-promoted aerobic oxidative cyclization reaction of ketoxime acetates and pyridines.
Scheme 74: CuI-catalyzed pathway for the formation of imidazo[1,2-a]pyridine.
Scheme 75: Mechanistic pathway.
Scheme 76: Mechanistic rationale for the synthesis of products.
Scheme 77: Copper-catalyzed synthesis of vinyloxy-IP.
Scheme 78: Regioselective product formation with propiolates.
Scheme 79: Proposed mechanism for vinyloxy-IP formation.
Scheme 80: Regioselective synthesis of 3-hetero-substituted imidazo[1,2-a]pyridines with different reaction su...
Scheme 81: Mechanistic pathway.
Scheme 82: CuI-mediated synthesis of 3-formylimidazo[1,2-a]pyridines.
Scheme 83: Radical pathway for 3-formylated IP synthesis.
Scheme 84: Pd-catalyzed urea-cyclization reaction for IPs.
Scheme 85: Pd-catalyzed one-pot-tandem amination and intramolecular amidation reaction.
Figure 5: Scope of aniline nucleophiles.
Scheme 86: Pd–Cu-catalyzed Sonogashira coupling reaction.
Scheme 87: One-pot amide coupling reaction for the synthesis of imidazo[4,5-b]pyridines.
Scheme 88: Urea cyclization reaction for the synthesis of two series of pyridines.
Scheme 89: Amidation reaction for the synthesis of imidazo[4,5-b]pyridines.
Figure 6: Amide scope.
Scheme 90: Pd NPs-catalyzed 3-component reaction for the synthesis of 2,3-diarylated IPs.
Scheme 91: Plausible mechanistic pathway for Pd NPs-catalyzed MCR.
Scheme 92: Synthesis of chromenoannulated imidazo[1,2-a]pyridines.
Scheme 93: Mechanism for the synthesis of chromeno-annulated IPs.
Scheme 94: Zinc oxide NRs-catalyzed synthesis of imidazo[1,2-a]azines/diazines.
Scheme 95: Zinc oxide-catalyzed isocyanide based GBB reaction.
Scheme 96: Reaction pathway for ZnO-catalyzed GBB reaction.
Scheme 97: Mechanistic pathway.
Scheme 98: ZnO NRs-catalyzed MCR for the synthesis of imidazo[1,2-a]azines.
Scheme 99: Ugi type GBB three-component reaction.
Scheme 100: Magnetic NPs-catalyzed synthesis of imidazo[1,2-a]pyridines.
Scheme 101: Regioselective synthesis of 2-alkoxyimidazo[1,2-a]pyridines catalyzed by Fe-SBA-15.
Scheme 102: Plausible mechanistic pathway for the synthesis of 2-alkoxyimidazopyridine.
Scheme 103: Iron-catalyzed synthetic approach.
Scheme 104: Iron-catalyzed aminooxygenation reaction.
Scheme 105: Mechanistic pathway.
Scheme 106: Rh(III)-catalyzed double C–H activation of 2-substituted imidazoles and alkynes.
Scheme 107: Plausible reaction mechanism.
Scheme 108: Rh(III)-catalyzed non-aromatic C(sp2)–H bond activation–functionalization for the synthesis of imid...
Scheme 109: Reactivity and selectivity of different substrates.
Scheme 110: Rh-catalyzed direct C–H alkynylation by Li et al.
Scheme 111: Suggested radical mechanism.
Scheme 112: Scandium(III)triflate-catalyzed one-pot reaction and its mechanism for the synthesis of benzimidazo...
Scheme 113: RuCl3-assisted Ugi-type Groebke–Blackburn condensation reaction.
Scheme 114: C-3 aroylation via Ru-catalyzed two-component reaction.
Scheme 115: Regioselective synthetic mechanism.
Scheme 116: La(III)-catalyzed one-pot GBB reaction.
Scheme 117: Mechanistic approach for the synthesis of imidazo[1,2-a]pyridines.
Scheme 118: Synthesis of imidazo[1,2-a]pyridine using LaMnO3 NPs under neat conditions.
Scheme 119: Mechanistic approach.
Scheme 120: One-pot 3-CR for regioselective synthesis of 2-alkoxy-3-arylimidazo[1,2-a]pyridines.
Scheme 121: Formation of two possible products under optimization of the catalysts.
Scheme 122: Mechanistic strategy for NiFe2O4-catalyzed reaction.
Scheme 123: Two-component reaction for synthesizing imidazodipyridiniums.
Scheme 124: Mechanistic scheme for the synthesis of imidazodipyridiniums.
Scheme 125: CuI-catalyzed arylation of imidazo[1,2-a]pyridines.
Scheme 126: Mechanism for arylation reaction.
Scheme 127: Cupric acetate-catalyzed double carbonylation approach.
Scheme 128: Radical mechanism for double carbonylation of IP.
Scheme 129: C–S bond formation reaction catalyzed by cupric acetate.
Scheme 130: Cupric acetate-catalyzed C-3 formylation approach.
Scheme 131: Control experiments for signifying the role of DMSO and oxygen.
Scheme 132: Mechanism pathway.
Scheme 133: Copper bromide-catalyzed CDC reaction.
Scheme 134: Extension of the substrate scope.
Scheme 135: Plausible radical pathway.
Scheme 136: Transannulation reaction for the synthesis of imidazo[1,5-a]pyridines.
Scheme 137: Plausible reaction pathway for denitrogenative transannulation.
Scheme 138: Cupric acetate-catalyzed C-3 carbonylation reaction.
Scheme 139: Plausible mechanism for regioselective C-3 carbonylation.
Scheme 140: Alkynylation reaction at C-2 of 3H-imidazo[4,5-b]pyridines.
Scheme 141: Two-way mechanism for C-2 alkynylation of 3H-imidazo[4,5-b]pyridines.
Scheme 142: Palladium-catalyzed SCCR approach.
Scheme 143: Palladium-catalyzed Suzuki coupling reaction.
Scheme 144: Reaction mechanism.
Scheme 145: A phosphine free palladium-catalyzed synthesis of C-3 arylated imidazopyridines.
Scheme 146: Palladium-mediated Buchwald–Hartwig cross-coupling reaction.
Figure 7: Structure of the ligands optimized.
Scheme 147: Palladium acetate-catalyzed direct arylation of imidazo[1,2-a]pyridines.
Scheme 148: Palladium acetate-catalyzed mechanistic pathway.
Scheme 149: Palladium acetate-catalyzed regioselective arylation reported by Liu and Zhan.
Scheme 150: Mechanism for selective C-3 arylation of IP.
Scheme 151: Pd(II)-catalyzed alkenylation reaction with styrenes.
Scheme 152: Pd(II)-catalyzed alkenylation reaction with acrylates.
Scheme 153: A two way mechanism.
Scheme 154: Double C–H activation reaction catalyzed by Pd(OAc)2.
Scheme 155: Probable mechanism.
Scheme 156: Palladium-catalyzed decarboxylative coupling.
Scheme 157: Mechanistic cycle for decarboxylative arylation reaction.
Scheme 158: Ligand-free approach for arylation of imidazo[1,2-a]pyridine-3-carboxylic acids.
Scheme 159: Mechanism for ligandless arylation reaction.
Scheme 160: NHC-Pd(II) complex assisted arylation reaction.
Scheme 161: C-3 arylation of imidazo[1,2-a]pyridines with aryl bromides catalyzed by Pd(OAc)2.
Scheme 162: Pd(II)-catalyzed C-3 arylations with aryl tosylates and mesylates.
Scheme 163: CDC reaction for the synthesis of imidazo[1,2-a]pyridines.
Scheme 164: Plausible reaction mechanism for Pd(OAc)2-catalyzed synthesis of imidazo[1,2-a]pyridines.
Scheme 165: Pd-catalyzed C–H amination reaction.
Scheme 166: Mechanism for C–H amination reaction.
Scheme 167: One-pot synthesis for 3,6-di- or 2,3,6-tri(hetero)arylimidazo[1,2-a]pyridines.
Scheme 168: C–H/C–H cross-coupling reaction of IPs and azoles catalyzed by Pd(II).
Scheme 169: Mechanistic cycle.
Scheme 170: Rh-catalyzed C–H arylation reaction.
Scheme 171: Mechanistic pathway for C–H arylation of imidazo[1,2-a]pyridine.
Scheme 172: Rh(III)-catalyzed double C–H activation of 2-phenylimidazo[1,2-a]pyridines and alkynes.
Scheme 173: Rh(III)-catalyzed mechanistic pathway.
Scheme 174: Rh(III)-mediated oxidative coupling reaction.
Scheme 175: Reactions showing functionalization of the product obtained by the group of Kotla.
Scheme 176: Mechanism for Rh(III)-catalyzed oxidative coupling reaction.
Scheme 177: Rh(III)-catalyzed C–H activation reaction.
Scheme 178: Mechanistic cycle.
Scheme 179: Annulation reactions of 2-arylimidazo[1,2-a]pyridines and alkynes.
Scheme 180: Two-way reaction mechanism for annulations reaction.
Scheme 181: [RuCl2(p-cymene)]2-catalyzed C–C bond formation reaction.
Scheme 182: Reported reaction mechanism.
Scheme 183: Fe(III) catalyzed C-3 formylation approach.
Scheme 184: SET mechanism-catalyzed by Fe(III).
Scheme 185: Ni(dpp)Cl2-catalyzed KTC coupling.
Scheme 186: Pd-catalyzed SM coupling.
Scheme 187: Vanadium-catalyzed coupling of IP and NMO.
Scheme 188: Mechanistic cycle.
Scheme 189: Selective C3/C5–H bond functionalizations by mono and bimetallic systems.
Scheme 190: rGO-Ni@Pd-catalyzed C–H bond arylation of imidazo[1,2-a]pyridine.
Scheme 191: Mechanistic pathway for heterogeneously catalyzed arylation reaction.
Scheme 192: Zinc triflate-catalyzed coupling reaction of substituted propargyl alcohols.
DABCO- and DBU-promoted one-pot reaction of N-sulfonyl ketimines with Morita–Baylis–Hillman carbonates: a sequential approach to (2-hydroxyaryl)nicotinate derivatives
- Soumitra Guin,
- Raman Gupta,
- Debashis Majee and
- Sampak Samanta
Beilstein J. Org. Chem. 2018, 14, 2771–2778, doi:10.3762/bjoc.14.254
- construction of pyridines bearing a carboxylate or CN group at C3 position has been a lucrative target for chemists due to the pharmaceutically privileged status (Figure 1). In this context, Rodriguez’s group successfully established a one-pot three-component reaction between β,γ-unsaturated α-ketoesters, 1,3
Graphical Abstract
Figure 1: Drugs and agrochemicals having a nicotinic acid derivative.
Scheme 1: One-pot access to (2-hydroxyaryl)pyridines.
Scheme 2: A possible mechanism for this sequential reaction.
Scheme 3: Substrate scope for (2-hydroxyaryl)nicotinates syntheses. The reaction was performed with 1a–e (0.2...
Scheme 4: One-pot synthesis of (2-hydroxyaryl)nicotinonitriles 5ak–5am.
An overview on recent advances in the synthesis of sulfonated organic materials, sulfonated silica materials, and sulfonated carbon materials and their catalytic applications in chemical processes
- Hashem Sharghi,
- Pezhman Shiri and
- Mahdi Aberi
Beilstein J. Org. Chem. 2018, 14, 2745–2770, doi:10.3762/bjoc.14.253
- , catalyst 53 was utilized for the synthesis of 2H-indazolo[2,1-b]phthalazine-1,6,11(13H)-trione derivatives 55 via a one-pot, three-component reaction of phthalhydrazide (54), aldehydes 7, and dimedone (20) or cyclohexane-1,3-dione (for R3 = H, 20) under solvent-free conditions (Scheme 9). To check the
Graphical Abstract
Figure 1: Different types of sulfonated materials as acid catalysts.
Scheme 1: Synthetic route of 3-methyl-1-sulfo-1H-imidazolium metal chloride ILs and their catalytic applicati...
Scheme 2: Synthetic route of 1,3-disulfo-1H-imidazolium transition metal chloride ILs and their catalytic app...
Scheme 3: Synthetic route of 1,3-disulfoimidazolium carboxylate ILs and their catalytic applications in the s...
Scheme 4: Synthetic route of [BiPy](HSO3)2Cl2 and [Dsim]HSO4 ILs and their catalytic applications for the syn...
Scheme 5: The catalytic applications of (C4(DABCO-SO3H)2·4Cl) IL for the synthesis of spiro-isatin derivative...
Scheme 6: The catalytic applications of (C4(DABCO-SO3H)2·4Cl) IL for the synthesis of bis 2-amino-4H-pyran de...
Scheme 7: The synthetic route of N,N-disulfo-1,1,3,3-tetramethylguanidinium carboxylate ILs and their catalyt...
Scheme 8: The catalytic application of 1-methyl-3-sulfo-1H-imidazolium tetrachloroferrate IL in the synthesis...
Scheme 9: The synthetic route of 3-sulfo-1H-imidazolopyrimidinium hydrogen sulfate IL and its catalytic appli...
Scheme 10: The results for the synthesis of bis(indolyl)methanes and di(bis(indolyl)methyl)benzenes in the pre...
Scheme 11: The catalytic applications of 1-(1-sulfoalkyl)-3-methylimidazolium chloride acidic ILs for the hydr...
Scheme 12: The synthetic route of immobilized 1,4-diazabicyclo[2.2.2]octanesulfonic acid chloride on SiO2 and ...
Scheme 13: The catalytic application of a silica-bonded sulfoimidazolium chloride for the synthesis of 12-aryl...
Scheme 14: The synthetic route of the SBA-15-Ph-SO3H and its catalytic applications for the synthesis of 2H-in...
Scheme 15: The synthetic route for heteropolyanion-based ionic liquids immobilized on mesoporous silica SBA-15...
Scheme 16: Some mechanism aspects of SSA catalyst for the protection of amine derivatives.
Scheme 17: The synthetic route for MWCNT-SO3H and its catalytic application for the synthesis of N-substituted...
Scheme 18: The sulfonic acid-functionalized polymers (P-SO3H) covalently grafted on multi-walled carbon nanotu...
Scheme 19: The transesterification reaction in the presence of S-MWCNTs.
Scheme 20: The synthetic route for the new hypercrosslinked supermicroporous polymer via the Friedel–Crafts al...
Scheme 21: The synthetic route for a new microporous copolymer via the Friedel–Crafts alkylation reaction of t...
Scheme 22: The synthetic route for sulfonated polynaphthalene and its catalytic application for the amidoalkyl...
Scheme 23: The synthetic route of the acidic carbon material and its catalytic application in the etherificatio...
Scheme 24: The synthetic route of the acidic carbon materials and their catalytic applications for the esterif...
Scheme 25: The sulfonated MWCNTs.
Scheme 26: The sulfonated nanoscaled diamond powder for the dehydration of D-xylose into furfural.
Scheme 27: The synthetic route and catalytic application of the GR-SO3H.
Assembly of fully substituted triazolochromenes via a novel multicomponent reaction or mechanochemical synthesis
- Robby Vroemans,
- Yenthel Verhaegen,
- My Tran Thi Dieu and
- Wim Dehaen
Beilstein J. Org. Chem. 2018, 14, 2689–2697, doi:10.3762/bjoc.14.246
- the development of a metal-free sequential one-pot three-component reaction and the mechanochemically assisted 3-nitrochromene synthesis towards fully substituted triazolochromenes, without the isolation of the intermediate 3-nitrochromenes, have not been reported until now. Results and Discussion To
- prove the plausibility of the one-pot three-component reaction, we commenced our trials with the synthesis and isolation of 3-nitro-2H-chromene (3) as reported in the literature [15], followed by the 1,3-dipolar cycloaddition of the nitroalkene moiety with organic azides. We based the 1,3-dipolar
- reaction was further optimized using salicylaldehyde (1a), β-nitrostyrene (2a) and benzyl azide (3a) as model substrates (see Supporting Information File 1, pages S4–S8 for full description of the optimization study). The optimized conditions for the one-pot three-component reaction were determined to be 1
Graphical Abstract
Scheme 1: Two-step reaction towards triazolochromene 5a and obtained oxidized side product 6.
Scheme 2: Reaction pathways leading to the different regioisomers.
Figure 1: Scope with respect to various salicylaldehydes 1a–f, nitroalkenes 2a–d and organic azides 4a–g. aRe...
Scheme 3: Synthesis of bis-chromenotriazole 5p.
Figure 2: Generality of products obtained via the two-pot mechanochemical procedure, varying the salicylaldeh...
Scheme 4: Scale-up of the one-pot three-component reaction and two-step ball milling procedure.
Scheme 5: Postfunctional transformations of triazolochromenes.
One-pot three-component route for the synthesis of S-trifluoromethyl dithiocarbamates using Togni’s reagent
- Azim Ziyaei Halimehjani,
- Martin Dračínský and
- Petr Beier
Beilstein J. Org. Chem. 2017, 13, 2502–2508, doi:10.3762/bjoc.13.247
- Discussion We started our investigation with a one-pot, three-component reaction of piperidine, CS2, and a cyclic hypervalent iodane (Togni's reagent I) as a model reaction to find the optimal reaction conditions for the preparation of S-trifluoromethyl dithiocarbamates (Table 1). In the first run, we
- dithiocarbamate in THF, water or DMF the product ratio increased to 5:1 (Table 1, entries 13–15), the yield of 4a remained low compared to our one-pot three-component reaction in THF. In summary, stirring piperidine (1.5 equiv) and CS2 (1.5 equiv) in THF at room temperature for 10 min, followed by cooling to −78
Graphical Abstract
Scheme 1: Synthetic routes for the preparation of trifluoromethyl dithiocarbamates.
Scheme 2: Synthesis of S-trifluoromethyl dithiocarbamates. Isolated yields are given in parentheses.
Scheme 3: Formation of benzyl isothiocyanate in a reaction with benzylamine.
Figure 1: Variable temperature 1H NMR spectra of compound 4c (CH2 region on the left and CH3 region on the ri...
Figure 2: The Eyring plot obtained for the rotation around the N–C bond in compound 4c.
Figure 3: The optimized structure of compound 4b (left) and the transition state structure for the rotation a...
Multicomponent synthesis of spiropyrrolidine analogues derived from vinylindole/indazole by a 1,3-dipolar cycloaddition reaction
- Manjunatha Narayanarao,
- Lokesh Koodlur,
- Vijayakumar G. Revanasiddappa,
- Subramanya Gopal and
- Susmita Kamila
Beilstein J. Org. Chem. 2016, 12, 2893–2897, doi:10.3762/bjoc.12.288
- in the construction of functionalized spiro compounds. We report herein the facile synthesis of novel spiropyrrolidine compounds through a one-pot three-component reaction involving N-substituted vinylindole/indazole, ninhydrin and sarcosine/L-proline. The present multicomponent reaction (MCR) leads
- acetate mixture. The resulting 5-bromo-N-alkyl derivatives 2 were then treated with potassium vinyltrifluoroborate and PdCl2(dppf)CH2Cl2 in DMF at 90 °C to afford the vinyl-substituted products 3 in excellent yields (Scheme 1) [21][22]. In the next step, the one-pot three component reaction was carried
Graphical Abstract
Scheme 1: Synthesis of N-alkyl vinylindoles and N-alkyl vinylindazoles (3).
Scheme 2: Retrosynthetic strategy used for the synthesis of 7 and 8.
Figure 1: NOE interactions in compound 8c supporting the stereochemical assignments for 8a–k. H1 and H2 on th...
Figure 2: ORTEP representation of compounds 7a and 7f obtained by single crystal XRD study.
Multicomponent reactions: A simple and efficient route to heterocyclic phosphonates
- Mohammad Haji
Beilstein J. Org. Chem. 2016, 12, 1269–1301, doi:10.3762/bjoc.12.121
- modifications The one-pot three-component reaction between aldehydes 19 (or ketones), amines 20 and dialkyl phosphonates 21 to afford α-aminophosphonates 22 is traditionally known as the Kabachnik–Fields reaction. This reaction was first reported in 1952 by Kabachnik, Medved and Fields (Scheme 6) [29][30]. Due
- and the structure of the dialkyl phosphite and isatin (Scheme 9) [35]. In this way a one-pot three-component reaction between 1-tosylpiperidine-4-one (34), aromatic amines 35 and diethyl phosphonate in the presence of magnesium perchlorate as a catalyst, under neat conditions at 80 °C afforded α
- attention from organic chemists. The best procedure for the preparation of these compounds involves a one-pot three-component reaction between salicylaldehydes 157, malononitrile (145) and trialkyl phosphite that was first reported by Perumal et al. (Scheme 34) [57]. The desired (2-amino-3-cyano-4H-chromen
Graphical Abstract
Scheme 1: The Biginelli condensation.
Scheme 2: The Biginelli reaction of β-ketophosphonates catalyzed by ytterbium triflate.
Scheme 3: Trimethylchlorosilane-mediated Biginelli reaction of diethyl (3,3,3-trifluoropropyl-2-oxo)phosphona...
Scheme 4: Biginelli reaction of dialkyl (3,3,3-trifluoropropyl-2-oxo)phosphonate with trialkyl orthoformates ...
Scheme 5: p-Toluenesulfonic acid-promoted Biginelli reaction of β-ketophosphonates, aryl aldehydes and urea.
Scheme 6: General Kabachnik–Fields reaction for the synthesis of α-aminophosphonates.
Scheme 7: Phthalocyanine–AlCl catalyzed Kabachnik–Fields reaction of N-Boc-piperidin-4-one with diethyl phosp...
Scheme 8: Kabachnik–Fields reaction of isatin with diethyl phosphite and benzylamine.
Scheme 9: Magnetic Fe3O4 nanoparticle-supported phosphotungstic acid-catalyzed Kabachnik–Fields reaction of i...
Scheme 10: The Mg(ClO4)2-catalyzed Kabachnik–Fields reaction of 1-tosylpiperidine-4-one.
Scheme 11: An asymmetric version of the Kabachnik–Fields reaction for the synthesis of α-amino-3-piperidinylph...
Scheme 12: A classical Kabachnik–Fields reaction followed by an intramolecular ring-closing reaction for the s...
Scheme 13: Synthesis of (S)-piperidin-2-phosphonic acid through an asymmetric Kabachnik–Fields reaction.
Scheme 14: A modified diastereoselective Kabachnik–Fields reaction for the synthesis of isoindolin-1-one-3-pho...
Scheme 15: A microwave-assisted Kabachnik–Fields reaction toward isoindolin-1-ones.
Scheme 16: The synthesis of 3-arylmethyleneisoindolin-1-ones through a Horner–Wadsworth–Emmons reaction of Kab...
Scheme 17: An efficient one-pot method for the synthesis of ethyl (2-alkyl- and 2-aryl-3-oxoisoindolin-1-yl)ph...
Scheme 18: FeCl3 and PdCl2 co-catalyzed three-component reaction of 2-alkynylbenzaldehydes, anilines, and diet...
Scheme 19: Three-component reaction of 6-methyl-3-formylchromone (75) with hydrazine derivatives or hydroxylam...
Scheme 20: Three-component reaction of 6-methyl-3-formylchromone (75) with thiourea, guanidinium carbonate or ...
Scheme 21: Three-component reaction of 6-methyl-3-formylchromone (75) with 1,4-bi-nucleophiles in the presence...
Scheme 22: One-pot three-component reaction of 2-alkynylbenzaldehydes, amines, and diethyl phosphonate.
Scheme 23: Lewis acid–surfactant combined catalysts for the one-pot three-component reaction of 2-alkynylbenza...
Scheme 24: Lewis acid catalyzed cyclization of different Kabachnik–Fields adducts.
Scheme 25: Three-component synthesis of N-arylisoquinolone-1-phosphonates 119.
Scheme 26: CuI-catalyzed three-component tandem reaction of 2-(2-formylphenyl)ethanones with aromatic amines a...
Scheme 27: Synthesis of 1,5-benzodiazepin-2-ylphosphonates via ytterbium chloride-catalyzed three-component re...
Scheme 28: FeCl3-catalyzed four-component reaction for the synthesis of 1,5-benzodiazepin-2-ylphosphonates.
Scheme 29: Synthesis of indole bisphosphonates through a modified Kabachnik–Fields reaction.
Scheme 30: Synthesis of heterocyclic bisphosphonates via Kabachnik–Fields reaction of triethyl orthoformate.
Scheme 31: A domino Knoevenagel/phospha-Michael process for the synthesis of 2-oxoindolin-3-ylphosphonates.
Scheme 32: Intramolecular cyclization of phospha-Michael adducts to give dihydropyridinylphosphonates.
Scheme 33: Synthesis of fused phosphonylpyrans via intramolecular cyclization of phospha-Michael adducts.
Scheme 34: InCl3-catalyzed three-component synthesis of (2-amino-3-cyano-4H-chromen-4-yl)phosphonates.
Scheme 35: Synthesis of phosphonodihydropyrans via a domino Knoevenagel/hetero-Diels–Alder process.
Scheme 36: Multicomponent synthesis of phosphonodihydrothiopyrans via a domino Knoevenagel/hetero-Diels–Alder ...
Scheme 37: One-pot four-component synthesis of 1,2-dihydroisoquinolin-1-ylphosphonates under multicatalytic co...
Scheme 38: CuI-catalyzed four-component reactions of methyleneaziridines towards alkylphosphonates.
Scheme 39: Ruthenium–porphyrin complex-catalyzed three-component synthesis of aziridinylphosphonates and its p...
Scheme 40: Copper(I)-catalyzed three-component reaction towards 1,2,3-triazolyl-5-phosphonates.
Scheme 41: Three-component reaction of acylphosphonates, isocyanides and dialkyl acetylenedicarboxylate to aff...
Scheme 42: Synthesis of (4-imino-3,4-dihydroquinazolin-2-yl)phosphonates via an isocyanide-based three-compone...
Scheme 43: Silver-catalyzed three-component synthesis of (2-imidazolin-4-yl)phosphonates.
Scheme 44: Three-component synthesis of phosphonylpyrazoles.
Scheme 45: One-pot three-component synthesis of 3-carbo-5-phosphonylpyrazoles.
Scheme 46: A one-pot two-step method for the synthesis of phosphonylpyrazoles.
Scheme 47: A one-pot method for the synthesis of (5-vinylpyrazolyl)phosphonates.
Scheme 48: Synthesis of 1H-pyrrol-2-ylphosphonates via the [3 + 2] cycloaddition of phosphonate azomethine yli...
Scheme 49: Three-component synthesis of 1H-pyrrol-2-ylphosphonates.
Scheme 50: The classical Reissert reaction.
Scheme 51: One-pot three-component synthesis of N-phosphorylated isoquinolines.
Scheme 52: One-pot three-component synthesis of 1-acyl-1,2-dihydroquinoline-2-phosphonates and 2-acyl-1,2-dihy...
Scheme 53: Three-component reaction of pyridine derivatives with ethyl propiolate and dialkyl phosphonates.
Scheme 54: Three-component reactions for the phosphorylation of benzothiazole and isoquinoline.
Scheme 55: Three-component synthesis of diphenyl [2-(aminocarbonyl)- or [2-(aminothioxomethyl)-1,2-dihydroisoq...
Scheme 56: Three-component stereoselective synthesis of 1,2-dihydroquinolin-2-ylphosphonates and 1,2-dihydrois...
Scheme 57: Diphosphorylation of diazaheterocyclic compounds via a tandem 1,4–1,2 addition of dimethyl trimethy...
Scheme 58: Multicomponent reaction of alkanedials, acetamide and acetyl chloride in the presence of PCl3 and a...
Scheme 59: An oxidative domino three-component synthesis of polyfunctionalized pyridines.
Scheme 60: A sequential one-pot three-component synthesis of polysubstituted pyrroles.
Scheme 61: Three-component decarboxylative coupling of proline with aldehydes and dialkyl phosphites for the s...
Scheme 62: Three-component domino aza-Wittig/phospha-Mannich sequence for the phosphorylation of isatin deriva...
Scheme 63: Stereoselective synthesis of phosphorylated trans-1,5-benzodiazepines via a one-pot three-component...
Scheme 64: One-pot three-component synthesis of phosphorylated 2,6-dioxohexahydropyrimidines.
Synthesis of bi- and bis-1,2,3-triazoles by copper-catalyzed Huisgen cycloaddition: A family of valuable products by click chemistry
- Zhan-Jiang Zheng,
- Ding Wang,
- Zheng Xu and
- Li-Wen Xu
Beilstein J. Org. Chem. 2015, 11, 2557–2576, doi:10.3762/bjoc.11.276
- corresponding azide for the next CuAAC reaction to give the desired bistriazoles. In 2007, Wang and co-workers demonstrated that the one-pot three-component reaction of ortho- and meta-bis(chloromethyl)benzene (62), sodium azide, and terminal alkynes, catalyzed by CuX in water could provide the corresponding
Graphical Abstract
Scheme 1: The synthesis of triazoles through the Huisgen cycloaddition of azides to alkynes.
Scheme 2: The synthesis of symmetrically substituted 4,4'-bitriazoles.
Scheme 3: The synthesis of unsymmetrically substituted 4,4'-bitriazoles.
Scheme 4: The stepwise preparation of unsymmetrical 4,4'-bitriazoles.
Scheme 5: The synthesis of 5,5'-bitriazoles.
Scheme 6: The synthesis of bistriazoles and cyclic 5,5’-bitriazoles under different catalytic systems.
Scheme 7: The double CuAAC reaction between helicenequinone and 1,1’-diazidoferrocene.
Scheme 8: The synthesis of 1,2,3-triazoles and 5,5’-bitriazoles from acetylenic amide.
Scheme 9: The amine-functionalized polysiloxane-mediated divergent synthesis of trizaoles and bitriazoles.
Scheme 10: The cyclic BINOL-based 5,5’-bitriazoles.
Scheme 11: The one-pot click–click reactions for the synthesis of bistriazoles.
Scheme 12: The synthesis of bis(indolyl)methane-derivatized 1,2,3-bistriazoles.
Scheme 13: The sequential, chemoselective preparation of bistriazoles.
Scheme 14: The sequential SPAAC and CuAAC reaction for the preparation of bistriazoles.
Scheme 15: The synthesis of D-mannitol-based bistriazoles.
Scheme 16: The synthesis of ester-linked and amide-linked bistriazoles.
Scheme 17: The synthesis of acenothiadiazole-based bistriazoles.
Scheme 18: The pyrene-appended thiacalix[4]arene-based bistriazole.
Scheme 19: The synthesis of triazole-based tetradentate ligands.
Scheme 20: The synthesis of phenanthroline-2,9-bistriazoles.
Scheme 21: The three-component reaction for the synthesis of bistriazoles.
Scheme 22: The one-pot synthesis of bistriazoles.
Scheme 23: The synthesis of polymer-bearing 1,2,3-bistriazole.
Scheme 24: The synthesis of bistriazoles via a sequential one-pot reaction.
New highlights of the syntheses of pyrrolo[1,2-a]quinoxalin-4-ones
- Emilian Georgescu,
- Alina Nicolescu,
- Florentina Georgescu,
- Florina Teodorescu,
- Daniela Marinescu,
- Ana-Maria Macsim and
- Calin Deleanu
Beilstein J. Org. Chem. 2014, 10, 2377–2387, doi:10.3762/bjoc.10.248
- from benzimidazoles unsubstituted at the five membered ring, alkyl bromoacetates and non-symmetrical electron-deficient alkynes in the molar ratio of 1:2:1, in 1,2-epoxybutane at reflux temperature, led directly to pyrrolo[1,2-a]quinoxalin-4-ones in fair yield by an one-pot three-component reaction
- ][9][10][11][12][13]. The development of more efficient synthetic methods towards these compounds is an active research area [14][15][16]. Recently, we reported on the formation of pyrrolo[1,2-a]benzimidazoles along with pyrrolo[1,2-a]quinoxalines in the one-pot three-component reaction of 1
- starting from benzimidazole derivatives unsubstituted at the five membered ring, alkyl bromoacetates and non-symmetrical electron-deficient alkynes in the molar ratio of 1:2:1, in 1,2-epoxybutane at reflux temperature. Results and Discussion The one-pot three-component reaction of 1-substituted
Graphical Abstract
Scheme 1: Synthesis of pyrrolo[1,2-a]quinoxalin-4-ones 4 and pyrrolo[1,2-a]benzimidazoles 5.
Scheme 2: Reaction pathway leading to the formation of pyrrolo[1,2-a]quinoxalin-4-ones 4 and pyrrolo[1,2-a]be...
Scheme 3: Novel synthetic pathway towards pyrrolo[1,2-a]quinoxalin-4-ones 10.
Figure 1: Undecoulpled H,C-HSQC spectrum for compound 5h.
Figure 2: Individual 1H signal assignments based on 13C traces from H,C-undecoulpled-HSQC spectrum around the...
Figure 3: NOE response as cross peaks between carbethoxy group protons and protons from positions 2 and 8 of ...
Efficient synthesis of dihydropyrimidinones via a three-component Biginelli-type reaction of urea, alkylaldehyde and arylaldehyde
- Haijun Qu,
- Xuejian Li,
- Fan Mo and
- Xufeng Lin
Beilstein J. Org. Chem. 2013, 9, 2846–2851, doi:10.3762/bjoc.9.320
- ). The variation of the alkyl substituent of acetaldehydes 2 is well tolerated to provide the desired products 4o–4q in 48–55% isolated yields. Finally, N-ethylurea 1b was also investigated in the one-pot three-component reaction, and the reactions proceeded smoothly to give the corresponding
Graphical Abstract
Figure 1: X-ray crystal structure of 4a.
Scheme 1: Possible mechanism.
Figure 2: Scope of the enantioselective reaction. Reaction conditions: 5a (10 mol %, 0.02 mmol), 1 (0.2 mmol)...
From bead to flask: Synthesis of a complex β-amido-amide for probe-development studies
- Kevin S. Martin,
- Cristian Soldi,
- Kellan N. Candee,
- Hiromi I. Wettersten,
- Robert H. Weiss and
- Jared T. Shaw
Beilstein J. Org. Chem. 2013, 9, 260–264, doi:10.3762/bjoc.9.31
- studies of this compound as a biological probe [14][15]. The synthesis of 1 emanates from a one-pot, three-component reaction (3CR) of an arylaldehyde, malonic acid (5), and ammonium acetate, which assembles the β-amino acid core (Figure 2) [14][15][18]. In the reported synthesis of 1, a protected β-amino
Graphical Abstract
Figure 1: p21 determines the fate of DNA-damaged [13] cells.
Figure 2: Retrosynthetic analysis of LLW62 (1) from acid 7 (A) or aldehyde 11 (B).
Scheme 1: Attempted synthesis of aldehyde 4 from nitrile 6.
Scheme 2: (A) Synthesis of 4 from acid 7 and (B) attempted β-amino acid-forming 3CRs.
Scheme 3: Synthesis of LLW62 by using an early stage 3CR.
Synthesis of spiro[dihydropyridine-oxindoles] via three-component reaction of arylamine, isatin and cyclopentane-1,3-dione
- Yan Sun,
- Jing Sun and
- Chao-Guo Yan
Beilstein J. Org. Chem. 2013, 9, 8–14, doi:10.3762/bjoc.9.2
- arylamine played an important factor. The inactive arylamine bearing electron-withdrawing groups could not react with carbonium ion B, thus could not give the expected spiro compound. Conclusion In conclusion, we have described a one-pot three-component reaction of arylamine, isatin and cyclopentane-1,3
Graphical Abstract
Scheme 1: The four-component reactions containing dimedone (a) and cyclopentane-1,3-dione (b).
Figure 1: Molecular structure of spiro[dihydropyridine-oxindole] 1b.
Figure 2: The two kinds of spiro compounds from reactions of isatins with arylamines and cyclic 1,3-diketones....
Figure 3: Molecular structure of spiro[dihydropyridine-oxindole] 2f.
Scheme 2: Condensation reactions of isatins with cyclopentane-1,3-dione.
Figure 4: Molecular structure of compound 3d.
Scheme 3: Proposed reaction mechanism for the three-component reaction.
Enaminones in a multicomponent synthesis of 4-aryldihydropyridines for potential applications in photoinduced intramolecular electron-transfer systems
- Nouria A. Al-Awadi,
- Maher R. Ibrahim,
- Mohamed H. Elnagdi,
- Elizabeth John and
- Yehia A. Ibrahim
Beilstein J. Org. Chem. 2012, 8, 441–447, doi:10.3762/bjoc.8.50
- in the mapping of enzyme kinetics by means of the fluorescence similarity to NADH [11][12][13]. Moreover, there has been recent interest in the synthesis of dihydropyridine derivatives, due to their wide range of biological activity [14][15], by a one-pot three-component reaction with aliphatic
- . This is a one-pot three-component reaction; on the other hand, the reported method involves two steps starting with the reaction of phenylpropynone with a primary amine, followed by reaction with different aldehydes. The synthesis of suitable substituted derivatives, such as 6 and 7, possessing
Graphical Abstract
Scheme 1: 2,6-Dihydropyridine-3,5-dicarboxylates as useful organic dyads.
Scheme 2: Synthesis of dihydropyridine derivatives from enaminones.
Scheme 3: Dihydropyridine derivatives 4–7 and enaminone 8.
Figure 1: ORTEP of compounds 4b, 6d, 6f and 7a.
Figure 2: Absorption spectra of compounds 2j, 6a–f and 7a,b in acetonitrile (1 × 10−4 M).
Figure 3: Emission spectra of compounds 4a, 6a–f and 7a,b after excitation at their absorption λmax in the ra...
Figure 4: Emission spectra of compounds 2j, 4a, 6a–f and 7a,b after excitation at their absorption λmax in th...
Scheme 4: Synthesis of dihydropyridines from an enamino aldehyde, an enamino ester and an enaminonitrile.
Scheme 5: Nitric acid oxidation of dihydropyridines 2a–c and 6a.
Figure 5: ORTEP of compound 15d.
Regioselectivity in the multicomponent reaction of 5-aminopyrazoles, cyclic 1,3-diketones and dimethylformamide dimethylacetal under controlled microwave heating
- Kamal Usef Sadek,
- Ramadan Ahmed Mekheimer,
- Tahany Mahmoud Mohamed,
- Moustafa Sherief Moustafa and
- Mohamed Hilmy Elnagdi
Beilstein J. Org. Chem. 2012, 8, 18–24, doi:10.3762/bjoc.8.3
- triethylamine as base produces the more thermodynamically stable dihydropyridine (Hantzsch-type product). In addition, the nature of the catalyst plays an important role [20]. A one-pot three component reaction of 5-amino-1H-pyrazole-4-carbonitrile, dimedone and triethylorthoesters in toluene under reflux was
Graphical Abstract
Scheme 1: Microwave-assisted synthesis of 4 and 6.
Figure 1: ORTEP diagram of compound 6a.
Figure 2: ORTEP diagram of compound 5.
Figure 3: ORTEP diagram of compound 6e.
Figure 4: ORTEP diagram of compound 6g.
Scheme 2: A proposed mechanism to account for the formation of products 6. The factors that determine the nat...
Amines as key building blocks in Pd-assisted multicomponent processes
- Didier Bouyssi,
- Nuno Monteiro and
- Geneviève Balme
Beilstein J. Org. Chem. 2011, 7, 1387–1406, doi:10.3762/bjoc.7.163
- , oxidative addition of the aryl halide to the Pd(0) catalyst generates an organopalladium reagent, which activates the alkyne moiety towards nucleophilic attack of the amino group. A reductive elimination generates the indole derivatives 59. In this one-pot three-component reaction, the same palladium
Graphical Abstract
Scheme 1: Synthesis of substituted amides.
Scheme 2: Synthesis of ketocarbamates and imidazolones.
Scheme 3: Access to β-lactams.
Scheme 4: Access to β-lactams with increased structural diversity.
Scheme 5: Synthesis of imidazolinium salts.
Scheme 6: Access to the indenamine core.
Scheme 7: Synthesis of substituted tetrahydropyridines.
Scheme 8: Synthesis of more substituted tetrahydropyridines.
Scheme 9: Synthesis of chiral tetrahydropyridines.
Scheme 10: Preparation of α-aminonitrile by a catalyzed Strecker reaction.
Scheme 11: Synthesis of spiroacetals.
Scheme 12: Synthesis of masked 3-aminoindan-1-ones.
Scheme 13: Synthesis of homoallylic amines and α-aminoesters.
Scheme 14: Preparation of 1,2-dihydroisoquinolin-1-ylphosphonates.
Scheme 15: Pyrazole elaboration by cycloaddition of hydrazines with alkynones generated in situ.
Scheme 16: An alternative approach to pyrazoles involving hydrazine cycloaddition.
Scheme 17: Synthesis of pyrroles by cyclization of propargyl amines.
Scheme 18: Isoindolone and phthalazone synthesis by cyclization of acylhydrazides.
Scheme 19: Sultam synthesis by cyclization of sulfonamides.
Scheme 20: Synthesis of sulfonamides by aminosulfonylation of aryl iodides.
Scheme 21: Pyrrolidine synthesis by carbopalladation of allylamines.
Scheme 22: Synthesis of indoles through a sequential C–C coupling/desilylation–coupling/cyclization reaction.
Scheme 23: Synthesis of indoles by a site selective Pd/C catalyzed cross-coupling approach.
Scheme 24: Synthesis of isoindolin-1-one derivatives through a sequential Sonogashira coupling/carbonylation/h...
Scheme 25: Synthesis of pyrroles through an allylic amination/Sonogashira coupling/hydroamination reaction.
Scheme 26: Synthesis of indoles through a Sonogashira coupling/cyclofunctionalization reaction.
Scheme 27: Synthesis of indoles through a one-pot two-step Sonogashira coupling/cyclofunctionalization reactio...
Scheme 28: Synthesis of α-alkynylindoles through a Pd-catalyzed Sonogashira/double C–N coupling reaction.
Scheme 29: Synthesis of indoles through a Pd-catalyzed sequential alkenyl amination/C-arylation/N-arylation.
Scheme 30: Synthesis of N-aryl-2-benzylpyrrolidines through a sequential N-arylation/carboamination reaction.
Scheme 31: Synthesis of phenothiazine derivatives through a one-pot palladium-catalyzed double C–N arylation i...
Scheme 32: Synthesis of substituted imidazolidinones through a palladium-catalyzed three-component reaction of...
Scheme 33: Synthesis of 2,3-diarylated amines through a palladium-catalyzed four-component reaction involving ...
Scheme 34: Synthesis of rolipram involving a Pd-catalyzed three-component reaction.
Scheme 35: Synthesis of seven-membered ring lactams through a Pd-catalyzed amination/intramolecular cyclocarbo...
New acylides: synthesis of 3-O-[γ-(4-oxo-2-aryl- thiazolidin- 3-yl)butyryl]erythromycin A derivatives
- Deepa Pandey,
- Wahajul Haq and
- Seturam B. Katti
Beilstein J. Org. Chem. 2008, 4, No. 14, doi:10.3762/bjoc.4.14
- -thiazolidin-3-yl)butyryl]erythromycin A derivatives have been synthesized. The 3-hydroxy group was derivatised to a primary amine and subsequently the thiazolidinone nucleus was generated at the amino functionality through DCC mediated one-pot three-component reaction in good yields. Background Second
Graphical Abstract
Figure 1: Second generation macrolides.
Figure 2: Ketolides and acylides.
Scheme 1: Synthesis of 3-O-[γ-(4-oxo-2-aryl-thiazolidin-3-yl)butyryl]-6-O-methylerythromycin A derivatives 4a–...
Scheme 2: Synthesis of 3-O-[γ-(4-oxo-2-aryl-thiazolidin-3-yl)butyryl]erythromycin A derivatives 4a–f (Method ...
An efficient synthesis of novel pyrano[2,3-d]- and furopyrano[2,3-d]pyrimidines via indium- catalyzed multi- component domino reaction
- Dipak Prajapati and
- Mukut Gohain
Beilstein J. Org. Chem. 2006, 2, No. 11, doi:10.1186/1860-5397-2-11
- -nitrobenzaldehyde 2a, ethyl vinyl ether 4 in acetonitrile:water (3:1) and in presence of 1 mol% indium(III) trichloride, a one-pot three-component reaction proceeded spontaneously at room temperature. After completion and usual work-up the corresponding pyrano [2,3-d]pyrimidine derivative 5a was obtained in 99
Graphical Abstract
Scheme 1: Reagents and conditions: i) 1 mol% InCl3, acetonitrile:water (3:1)
Scheme 2: Reagents and conditions: i) 1 mol% InCl3, room temperature
