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Search for "library" in Full Text gives 327 result(s) in Beilstein Journal of Organic Chemistry. Showing first 200.
Activity assays of NnlA homologs suggest the natural product N-nitroglycine is degraded by diverse bacteria
Beilstein J. Org. Chem. 2024, 20, 830–840, doi:10.3762/bjoc.20.75
- ]. The discovery of the nnlA gene resulted from screening a JS1663 genomic library by monitoring for E. coli transformants that produced nitrite (NO2−) in the presence of NNG. Analysis of the mass balance via in vitro experiments showed that NnlA degraded NNG into NO2−, ammonium (NH4+), and glyoxylate
Methodology for awakening the potential secondary metabolic capacity in actinomycetes
Beilstein J. Org. Chem. 2024, 20, 753–766, doi:10.3762/bjoc.20.69
- have been no exhaustive analyses of high-temperature culture of actinomycetes. Thus, Saito et al. decided to test on a large scale whether high-temperature culture of actinomycetes can activate silent genes. First, an in-house library of 3,160 strains of actinomycetes widely isolated from Japanese soil
Chemoenzymatic synthesis of macrocyclic peptides and polyketides via thioesterase-catalyzed macrocyclization
Beilstein J. Org. Chem. 2024, 20, 721–733, doi:10.3762/bjoc.20.66
- possible and provides a potential to construct the analogs library of these bioactive macrocycles for further biological investigations. This review presents representative examples of chemoenzymatic approaches for macrocyclic peptides, polyketides, and their hybrids employing TE domains, and particular
- -like hexapeptides and also working on the cyclization of penta- and tetrapeptides [64]. The findings illustrated that PBP-type discrete TEs would become potent tools for the construction of a noncanonical macrocyclic peptides library. Macrocyclic polyketides and PKS/NRPS hybrids In contrast to the
New variochelins from soil-isolated Variovorax sp. H002
Beilstein J. Org. Chem. 2024, 20, 692–700, doi:10.3762/bjoc.20.63
- sequencing. For the short-lead sequencing, the library was prepared using 100 ng of the gDNA with an MGIEasy FS DNA Library Prep Set (MGI), following the manufacturer’s protocol. The gDNA was fragmented enzymatically to approximately 400 bp. As a result of sequencing (150 bp × 2) and quality filtering (Q
- library preparation with a Ligation Sequencing Kit (SQK-LSK 109), following the 1D genomic DNA by ligation protocol. The library was applied to a MinION flowcell (FLO MIN106 R9.41revD) operated by the MinKNOW (20.06.9) software, and then processed by Guppy basecaller (4.0.11) in the high accuracy mode. As
Metal-catalyzed coupling/carbonylative cyclizations for accessing dibenzodiazepinones: an expedient route to clozapine and other drugs
Beilstein J. Org. Chem. 2024, 20, 193–204, doi:10.3762/bjoc.20.19
- via a cross-coupling reaction with NH3 [13]. The reaction was undertaken in the presence of a catalytic amount of a palladium catalyst and afforded a library of dibenzodiazepinones in good to excellent yields (Scheme 1a). In 2013, Zhang et al. developed a synthetic route leading to structurally
GlAIcomics: a deep neural network classifier for spectroscopy-augmented mass spectrometric glycans data
Beilstein J. Org. Chem. 2023, 19, 1825–1831, doi:10.3762/bjoc.19.134
- each monosaccharide unit is measured, and subsequently identified by comparison with a library of reference spectra of synthetic monosaccharide standards. In the early days of MS–IR spectroscopy, ca. one hour was necessary to record the IR fingerprint of a single molecule and the identification was
- made by visual inspection, which was shortly automated by introducing a score derived from the convolution between the spectrum of the analyte of interest and the library of reference spectra. Despite the advantage of being automated, this later approach remains biased: for each molecular species, a
Synthesis and biological evaluation of Argemone mexicana-inspired antimicrobials
Beilstein J. Org. Chem. 2023, 19, 1511–1524, doi:10.3762/bjoc.19.108
- microorganisms. To do this, we are building a library of structural variants of phytochemicals isolated from the A. mexicana plant to evaluate against the following 12 microorganisms, which were previously identified as being present on the ISS [5]: five Gram-positive bacteria (Staphylococcus aureus, Bacillus
- cell lines. Conclusion Motivated by our prior isolation of three phytochemicals from the extracts of the Argemone mexicana plant, a library of structural variants of berberine and chelerythrine were prepared. Due to a greater synthetic ease, a larger number of berberine derivatives were explored. The
Functional characterisation of twelve terpene synthases from actinobacteria
Beilstein J. Org. Chem. 2023, 19, 1386–1398, doi:10.3762/bjoc.19.100
- (18), linalool (19), cis-p-ment-2-en-1-ol (20), terpinen-4-ol (21) and α-terpineol (22). All these compounds were identified by comparison of their mass spectra to library spectra and of their gas chromatographic retention indices to literature data (Table S5, Supporting Information File 1). This
Consecutive four-component synthesis of trisubstituted 3-iodoindoles by an alkynylation–cyclization–iodination–alkylation sequence
Beilstein J. Org. Chem. 2023, 19, 1379–1385, doi:10.3762/bjoc.19.99
- Nadia Ledermann Alae-Eddine Moubsit Thomas J. J. Muller Heinrich-Heine Universität Düsseldorf, Institut für Organische Chemie und Makromolekulare Chemie, Universitätsstraße 1, D-40225 Düsseldorf, Germany 10.3762/bjoc.19.99 Abstract A library of 19 differently substituted 3-iodoindoles is
Radical ligand transfer: a general strategy for radical functionalization
Beilstein J. Org. Chem. 2023, 19, 1225–1233, doi:10.3762/bjoc.19.90
- system was found to be compatible with unactivated alkenes bearing a wide range of functionalities, including more-substituted alkenes, and a wide range of alkyl halide reagents, permitting a library of difunctionalized products to be prepared from a single alkene. RLT can also be used to deliver
Enabling artificial photosynthesis systems with molecular recycling: A review of photo- and electrochemical methods for regenerating organic sacrificial electron donors
Beilstein J. Org. Chem. 2023, 19, 1198–1215, doi:10.3762/bjoc.19.88
Aromatic C–H bond functionalization through organocatalyzed asymmetric intermolecular aza-Friedel–Crafts reaction: a recent update
Beilstein J. Org. Chem. 2023, 19, 956–981, doi:10.3762/bjoc.19.72
- substrate scope was achieved by varying the substituents in the C3 position of the isoxazoles 82 and the carbocyclic ring substituents in ketimines 49. Few more products were added to the library by altering the substituents of the amine in 82 and the ring nitrogen in 49 (Scheme 20a) [48]. The
- π-nucleophiles in combination with β,γ-alkynyl-α-imino esters 93 acting as the electrophilic reagent. Chiral phosphoric acid P16 was the catalytic agent to access a series of enantioenriched α-amino esters 94 containing 5-aminopyrazolyl and alkynyl substituents at the α-carbon. A library of products
- nitrogen and ring nitrogen of 49 were screened under optimal reaction conditions where Cbz and benzyl were the best protecting groups in terms of enantioselectivities. A product library was prepared by varying sterically and electronic divergent functionalities in the carbocyclic rings of both reactants
Photoredox catalysis enabling decarboxylative radical cyclization of γ,γ-dimethylallyltryptophan (DMAT) derivatives: formal synthesis of 6,7-secoagroclavine
Beilstein J. Org. Chem. 2023, 19, 918–927, doi:10.3762/bjoc.19.70
- ][32][33], modification of biomacromolecules [34], and relatively complex pharmaceutical agents [35][36][37][38]. Photocatalysis tremendously enriches the synthetic compound library, providing a precious alternative to directly modify abundant natural substrates, including biomass, which usually
Pyridine C(sp2)–H bond functionalization under transition-metal and rare earth metal catalysis
Beilstein J. Org. Chem. 2023, 19, 820–863, doi:10.3762/bjoc.19.62
- yields generating a library of isonicotinic and nicotinic acid derivatives. Another inexpensive and non-toxic iron-catalyzed C–H arylation of pyridines has been reported by DeBeof and co-workers [98]. Using the imine in 147 as directing group, afforded the arylated pyridine products 150 in good to high
Synthesis of imidazo[1,2-a]pyridine-containing peptidomimetics by tandem of Groebke–Blackburn–Bienaymé and Ugi reactions
Beilstein J. Org. Chem. 2023, 19, 727–735, doi:10.3762/bjoc.19.53
- ]pyridine and peptidomimetic moieties as pharmacophores with four diversity points introduced from readily available starting materials, including scaffold diversity. A small focused compound library of 20 Ugi products was prepared and screened for antibacterial activity. Keywords: Groebke–Blackburn
- manner. A method for the synthesis of the desired compounds was developed, and a small library of 20 Ugi products was prepared. The study also demonstrated that the use of a CH2O linker between the carboxyl group and the aryl ring in the Ugi reaction enhanced the reactivity of the acid component. The
- of new acids containing a substituted imidazo[1,2-a]pyridine fragment without CH2O linker fragment. Library of peptidomimetics 7a–t containing a substituted imidazo[1,2-a]pyridine fragment. Screening conditions for synthesis of peptidomimetic 9а and 9b. Antibacterial activity results. Supporting
Discrimination of β-cyclodextrin/hazelnut (Corylus avellana L.) oil/flavonoid glycoside and flavonolignan ternary complexes by Fourier-transform infrared spectroscopy coupled with principal component analysis
Beilstein J. Org. Chem. 2023, 19, 380–398, doi:10.3762/bjoc.19.30
- FAME standard mixture. Moreover, the experimental MS spectra were compared with those from the NIST/EPA/NIH Mass Spectral Library 2.0 (2011). Acquisition and handling of the GC–MS data were performed using the Enhanced MSD ChemStation D.02.00.275 (Agilent Technologies, Santa Clara, CA, USA), while the
- MS identification was performed with the NIST Mass Spectral Search Program for the NIST/EPA/NIH Mass Spectral Library 2.0 (Gaithersburg, MD, USA). Determinations were performed in duplicate and the main findings reveal a high oleic acid relative content (as methyl ester) of 69.91(± 4.14) % at a RI of
Synthesis, α-mannosidase inhibition studies and molecular modeling of 1,4-imino-ᴅ-lyxitols and their C-5-altered N-arylalkyl derivatives
Beilstein J. Org. Chem. 2023, 19, 282–293, doi:10.3762/bjoc.19.24
- than parent DIM [15]. Also, screening of a large library of N-alkyl and N-arylalkyl DIMs revealed that they are less effective inhibitors of JBMan than DIM, indicating that N-alkylation might lead to better selectivity profiles. However, this library has not been assayed for GMII and LM, therefore the
- -imino-ᴅ-lyxitol which configurationally better resembles swainsonine or DIM. The most promising N-substituents from the previous study were selected and a small library of N-substituted 1,4-imino-ᴅ-lyxitols was prepared [22] (Figure 1). In addition, more relevant Caenorhabditis elegans α-mannosidase II
An efficient metal-free and catalyst-free C–S/C–O bond-formation strategy: synthesis of pyrazole-conjugated thioamides and amides
Beilstein J. Org. Chem. 2023, 19, 231–244, doi:10.3762/bjoc.19.22
- , due to various biological activities [36][37][38][39]. Accordingly, a broad spectrum of effective and useful methods has been acknowledged in the literature for their preparation [40][41][42]. In this regard, a review article by Jagodzinski et al. based on the examination of a massive virtual library
Synthesis and characterisation of new antimalarial fluorinated triazolopyrazine compounds
Beilstein J. Org. Chem. 2023, 19, 107–114, doi:10.3762/bjoc.19.11
- yields. This paper reports additional and more thorough Diversinate™ studies on three phenethyl ether substituted triazolopyrazine scaffolds, with a particular focus on incorporating the fluoro fragments -CF3, -CF2H and -CF2Me into the OSM Series 4 structures via LSF chemistry. The new library of
Combining the best of both worlds: radical-based divergent total synthesis
Beilstein J. Org. Chem. 2023, 19, 1–26, doi:10.3762/bjoc.19.1
- libraries. But how big should this chemical space be, so as to actually address our needs? A general consensus has emerged, supporting that “it is not actually the library size but rather the library diversity in terms of molecular structure and function which is fundamental for a successful drug discovery
Using UHPLC–MS profiling for the discovery of new sponge-derived metabolites and anthelmintic screening of the NatureBank bromotyrosine library
Beilstein J. Org. Chem. 2022, 18, 1544–1552, doi:10.3762/bjoc.18.164
- , 3010, Australia Biodiversity and Geosciences, Queensland Museum, Grey Street, Brisbane, 4101, Australia 10.3762/bjoc.18.164 Abstract In order to further expand the NatureBank open access compound library, chemical investigations of the Australian marine sponge, Ianthella basta, were undertaken since
- marine natural product, ianthesine E (2). The chemical structure of the new compound was determined following detailed spectroscopic and spectrometric data analysis. These two compounds (1 and 2) along with seven previously reported marine bromotyrosine alkaloids from the NatureBank open access library
- ], antibacterial [7][8], antimalarial [9], anti-HIV [10] and antifouling activities [11]. Due to our continuing interest in the identification of new secondary metabolites from Australian marine sources, in addition to further expanding the NatureBank [12] open access compound library, we have recently embarked on
Microelectrode arrays, electrosynthesis, and the optimization of signaling on an inert, stable surface
Beilstein J. Org. Chem. 2022, 18, 1488–1498, doi:10.3762/bjoc.18.156
- -time data on binding events appear ideal for such an iterative study. However, to use a microelectrode array in this fashion requires that the molecules being synthesized be added to the surface of an array as they become available, and then the growing library analyzed in a manner that allows the
Oxa-Michael-initiated cascade reactions of levoglucosenone
Beilstein J. Org. Chem. 2022, 18, 1457–1462, doi:10.3762/bjoc.18.151
- ]. These types of oxa-Michael initiated aldol condensations were also of interest to us due to the previous work conducted on aldol adducts of 1 [14][21], and the potential to generate bio-derived chiral materials with reactive functional groups. We envisaged that the development of a larger library of
Mechanochemical synthesis of unsymmetrical salens for the preparation of Co–salen complexes and their evaluation as catalysts for the synthesis of α-aryloxy alcohols via asymmetric phenolic kinetic resolution of terminal epoxides
Beilstein J. Org. Chem. 2022, 18, 1416–1423, doi:10.3762/bjoc.18.147
- as an enantioselective catalyst for the asymmetric ring opening of terminal epoxides by phenols. A library of α-aryloxy alcohols 3 was thereafter synthesized in good yield and high ee using 2f via the phenolic KR of epichlorohydrin. Keywords: α-aryloxy alcohols; chiral Co–salen; HKR
- in both techniques and probably pressure-induced activation and shearing deformation of reactant particles are more efficient using the grinding. We next examined the chelating effect of the above salens 1 with different transition metals. A library of metal–salen complexes was synthesized as
- intimate affinity of unsymmetrical salens chelating with metals. The HKR of epichlorohydrin with water catalyzed by Co–salens 2 was studied and chiral 2f showed an outstanding catalytic ability to afford the diol product in high ee (98%). A library of α-aryloxy alcohols was thereafter synthesized through
On drug discovery against infectious diseases and academic medicinal chemistry contributions
Beilstein J. Org. Chem. 2022, 18, 1355–1378, doi:10.3762/bjoc.18.141
- considering the results of academic as well as industrial screening campaigns. Keywords: antibacterials; frequent hitters; hit to lead chemical library; medicinal chemistry; virtual docking; Introduction The current state of affairs in the academia and two problems for medicinal chemists Across the world
- experiments following the screening of a library [51][52]. However, many of these compounds, often of natural origin [53]; polyphenols and curcumin being emblematic [54], are the bread and butter of quack medicine. Indeed, these will be found active on many biochemical or cellular assays [46] and will thus
- with a structural diversity are also prominent factors chosen for the ESCulab library made available by the European Lead Factory initiative [99]. Concerning this minimum of related compounds to include in an assay, it is likely stemming from Ulf Norinder’s probability-based illustration of the issues
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