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- Published 30 Jun 2022
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Scheme 1: Baeyer–Mills reaction of AB (1a) involving nucleophilic attack of aniline (2a) to nitrosobenzene (3...
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Figure 1: Flow setup for optimization of the Baeyer–Mills reaction with aniline (2a) and nitrosobenzene (3). ...
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Figure 2: Optimization of the Baeyer–Mills reaction of nitrosobenzene (3) with aniline (2a) to AB (1a). The n...
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Figure 3: Flow setup after prior optimization with unsubstituted aniline (2a) and nitrosobenzene (3) to AB (1a...
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Scheme 2: Large-scale synthesis of AB 1t from aniline 2t and nitrosobenzene (3) in >99% yield within 3 days.
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- Published 29 Jun 2022
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Scheme 1: Early studies concerning cyclopropene cycloadditions to azomethine ylides and cycloaddition reactio...
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Scheme 2: The pilot experiment aimed at studying the cycloaddition reaction between the protonated form of Ru...
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Scheme 3: Synthesis of meso-3'-azadispiro[indene-2,2'-bicyclo[3.1.0]hexane-4',2''-indene] derivatives 3b–g vi...
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Figure 1: ORTEP representation of the molecular structure of 3e.
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Scheme 4: The reaction of protonated Ruhemann's purple (1) with 3-methyl-3-phenylcyclopropene (2j).
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Scheme 5: Attempts to carry out the cycloaddition reactions between 3,3-disubstituted cyclopropenes 2k,l and ...
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Scheme 6: The reactions of protonated Ruhemann's purple (1) with unstable cyclopropenes 2m–p.
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Scheme 7: The acid–base reaction of Ruhemann's purple with hydrochloric acid and relative Gibbs free energy c...
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Scheme 8: Plausible mechanism of the 1,3-DC reaction of protonated Ruhemann's purple (1) with 3-methyl-3-phen...
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Scheme 9: Plausible mechanism of the 1,3-DC reaction of protonated Ruhemann's purple (1) with 1-chloro-2-phen...
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- Published 27 Jun 2022
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Figure 1: The olfactory spectrum wheel ordering different types of odorants from fruity to musky.
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Figure 2: Classification of odorants as “top note”, “middle note” and “base note” depending on their substant...
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Scheme 1: Synthesis of raspberry ketone (5) and raspberry ketone methyl ether (6) in two steps in flow.
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Scheme 2: Autoxidation of (+)-valencene (7) to (+)-nootkatone (8) under catalyst and solvent-free conditions ...
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Scheme 3: Enzyme-catalyzed acetylation of isoamyl alcohol (9) in a biphasic n-heptane/water mixture utilizing...
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Scheme 4: Esterification of alcohols by transesterification, catalyzed by immobilized acyltransferase in a pa...
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Scheme 5: Synthesis of homologated alcohols 20 by iterative homologation of terpenyl boronate esters 17 follo...
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Scheme 6: Sequential three-step synthesis of (S)-α-phellandrene (30) from (R)-carvone (25) via selective hydr...
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Scheme 7: Selective hydrogenation of alkyne 31 to “leaf alcohol” 32 employing a solid-supported palladium cat...
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Scheme 8: A) Synthesis of jasmonal (35) by crossed aldol condensation of benzaldehyde (33) and heptanal (34) ...
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Scheme 9: Synthesis of thymol (41) from m-cresol (39) and isopropyl alcohol via Fries-type rearrangement of e...
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Scheme 10: Preparation of coumarin (46) by reaction of salicylaldehyde (44) with potassium acetate, acetic aci...
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Scheme 11: Synthesis of phthalide (50) by photoinduced decatungstate catalysis.
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Scheme 12: Synthesis of woody acetate (54) by reduction of cyclohexanone 51 and subsequent acetylation; ADH200...
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Scheme 13: Synthesis of juniper lactone (56) by pyrolysis of triperoxide 55 generated by oxidation of cyclohex...
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Scheme 14: Synthesis of macrocyclic olefine 60 by ring-closing metathesis of diene 58 in a continuously stirre...
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Scheme 15: Synthesis of macrocycles 65 and 66 by ring-closing metathesis of dienes 62 or 63, respectively, in ...
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Scheme 16: Z-Selective synthesis of civetone (69) enabled by metathesis catalyst 68 in a tube-in-tube reactor.
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Scheme 17: Synthesis of macrocyclic olefine 72 by ring-closing metathesis of diene 70.
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- Published 24 Jun 2022
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Figure 1: Highly reactive dienophiles.
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Figure 2: Dibromide substrates and product 12.
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Scheme 1: Mechanochemical reaction of 10 with anthracene.
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Figure 3: Scope of the Zn/Cu reaction with dibromide 10 (dienes are colored in red).
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Scheme 2: Mechanochemical reaction of 11 with furan.
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Scheme 3: Reactivity of bicyclo[2.2.2] dibromide 42 with dienes.
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- Published 23 Jun 2022
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Scheme 1: Approaches to the synthesis of alkyl 4-oxo-1,4-dihydropyridine-3-carboxylates.
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Scheme 2: Synthesis of 4-oxo-1,4-dihydropyridine-3-carboxylates.
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Scheme 3: Synthesis of Isoxazoles 11–13.
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Scheme 4: Synthesis of isoxazoles 1.
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Scheme 5: Synthesis of pyridones 2.
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Scheme 6: Transformations of pyridones 2.
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- Published 22 Jun 2022
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Scheme 1: Historic synthetic approaches.
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Figure 1: Resonance forms of isocyanides.
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Scheme 2: Comparison between the previous mechanochemical synthetic pathway [24] and the new adapted one in this ...
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Scheme 3: The scope of our isocyanide synthesis using aliphatic and aromatic primary formamides. Reaction con...
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Figure 2: The purification process of a brownish isocyanide on a short silica pad.
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Scheme 4: Suggested proton transfer mechanism.
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- Published 22 Jun 2022
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Figure 1: Prenylated aromatic metabolites are involved in cellular processes like cell respiration (coenzyme Q...
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Figure 2: Homology clustering of Ptases encoded in marine Flavobacteria and Saccharomonospora species (G1–G4,...
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Figure 3: Regional alignment of ubiA-297 of Maribacter sp. MS6 (EU359911.1) and homologous genes in Z. uligin...
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Figure 4: A) Amino acid alignment and binding residues of UbiA-297. G2-Ptases are illustrated in the grey box...
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Figure 5: Evaluation of substrate specificity of UbiA-297. Accepted substrates are shown in red, while no pro...
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Figure 6: A) Reaction scheme of UbiA-297 catalyzing the assumed para-directed farnesylation of 8-HQA; B) calc...
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- Published 21 Jun 2022
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Figure 1: Examples of endoperoxide-containing natural products.
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Scheme 1: Reactions of COXs.
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Figure 2: Structures of COXs [52,53]. (A) The overall structure of ovine COX-1. (B and C) Comparison of the cyclooxy...
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Scheme 2: Proposed reaction mechanisms of COXs [24].
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Scheme 3: General reaction mechanism of Fe/2OG oxygenases.
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Scheme 4: Reaction of FtmOx1 [68-71].
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Figure 3: Structure of FtmOx1 [71]. (A) The FtmOx1 binary structure in complex with 2OG. (B and C) Comparison of ...
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Scheme 5: Proposed COX-like mechanism of FtmOx1 [68].
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Scheme 6: Proposed CarC-like mechanism of FtmOx1 [70].
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Scheme 7: Reaction of NvfI [28].
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Scheme 8: Possible reaction pathways leading to fumigatonoid A [28].
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Figure 4: Structure of NvfI [28]. (A–C) Conformational changes of loop regions: (A) open conformation, (B) partia...
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Scheme 9: Another possible reaction pathway for the formation of fumigatonoid A [28].
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- Review
- Published 20 Jun 2022
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Figure 1: Inductive heating, a powerful tool in industry and the Life Sciences.
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Figure 2: Electric displacement field of a ferromagnetic and superparamagnetic material.
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Figure 3: Temperature profiles of reactors heated conventionally and by RF heating (Figure 3 redrawn from [24]).
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Scheme 1: Continuous flow synthesis of isopulegol (2) from citronellal (1).
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Scheme 2: Dry (reaction 1) and steam (reaction 2) methane reforming.
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Scheme 3: Calcination and RF heating.
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Scheme 4: The continuously operated “Sabatier” process.
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Scheme 5: Biofuel production from biomass using inductive heating for pyrolysis.
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Scheme 6: Water electrolysis using an inductively heated electrolysis cell.
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Scheme 7: Dimroth rearrangement (reaction 1) and three-component reaction (reaction 2) to propargyl amines 8 ...
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Figure 4: A. Flow reactor filled with magnetic nanostructured particles (MagSilicaTM) and packed bed reactor ...
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Scheme 8: Claisen rearrangement in flow: A. comparison between conventional heating (external oil bath), micr...
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Scheme 9: Continuous flow reactions and comparison with batch reaction (oil bath). A. Pd-catalyzed transfer h...
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Scheme 10: Continuous flow reactions and comparison with batch reaction (oil bath). A. pericyclic reactions an...
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Scheme 11: Reactions under flow conditions using inductively heated fixed-bed materials serving as stoichiomet...
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Scheme 12: Reactions under flow conditions using inductively heated fixed-bed materials serving as catalysts: ...
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Scheme 13: Two step flow protocol for the preparation of 1,1'-diarylalkanes 77 from ketones and aldehydes 74, ...
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Scheme 14: O-Alkylation, the last step in the multistep flow synthesis of Iloperidone (80) accompanied with a ...
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Scheme 15: Continuous two-step flow process consisting of Grignard reaction followed by water elimination bein...
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Scheme 16: Inductively heated continuous flow protocol for the synthesis of Iso E Super (88) [91,92].
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Scheme 17: Three-step continuous flow synthesis of macrocycles 89 and 90 with musk-like olfactoric properties.
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- Published 15 Jun 2022
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Figure 1: Molecular structures of the monomeric cyclopalladated intermediate and brominated product observed ...
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Scheme 1: Halogenation of azobenzenes with strong electron-donating substituents.
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Figure 2: a) Two-dimensional (2D) plot of the time-resolved Raman monitoring of NG of L2 (0.50 mmol) with NBS...
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Figure 3: Experimental X-ray molecular structure of succinimide product L4-III.
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Scheme 2: PdII-catalyzed halogenation of azobenzene and its para-halogenated derivatives.
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Figure 4: Experimental X-ray molecular structure of the intermediate I6-I.
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Figure 5: a) In situ observation of I6-I during the time-resolved Raman monitoring of LAG of L6 (0.50 mmol) w...
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