Microwave-assisted synthesis and antimicrobial screening of new imidazole derivatives bearing 4-thiazolidinone nucleus
摘要:
A new series of compounds 2-((1-(4-(4-arylidene-2-methyl-5-oxo-4,5-dihydro-1H-imidazol-1-yl)phenyl)ethylidene)hydrazono)thiazolidin-4-ones (4a-o) have been synthesized under conventional and microwave irradiation method. All compounds were characterized by IR, H-1 NMR, C-13 NMR and mass spectra. Newly synthesized compounds were screened for their antibacterial and antifungal activities on Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, Staphylococcus pyogenes, Candida albicans, Aspergillus niger and Aspergillus clavatus by bioassays, namely serial broth dilution. The synthesized compounds showed potent antimicrobial activity against tested microorganisms. Compounds 4h, 4j, 4m and 4n were the most potent amongst tested compounds.
An<i>Atropos</i>Biphenyl Bisphosphine Ligand with 2,2′-<i>tert</i>-Butylmethylphosphino Groups for the Rhodium-Catalyzed Asymmetric Hydrogenation of Enol Esters
calculations described in our previous work. This P‐stereogenic bisphosphine ligand possessing a biphenyl backbone and 2,2′‐tert‐butylmethylphosphino groups has been applied to the Rh‐catalyzedasymmetric hydrogenation of enol esters, which has not been widely studied and can be used for the synthesis of several important bioactive compounds. Although there is room for further improvement in enantioselectivity
An asymmetric domino reaction was developed utilizing readily available cyclic α-dehydroamino ketones and aldehydes, which when subjected a 2-iodoxybenzoic acid (IBX)-mediated oxidation gives pyrrolidinone-containing tricyclic derivatives. trans-Perhydroindolic acid proved to be an efficient organocatalyst in this reaction (up to 94% yield, 99% ee, and >20:1 dr). The product could be conveniently converted
Single-Biocatalyst Synthesis of Enantiopure<scp>d</scp>-Arylalanines Exploiting an Engineered<scp>d</scp>-Amino Acid Dehydrogenase
作者:Fabio Parmeggiani、Syed T. Ahmed、Matthew P. Thompson、Nicholas J. Weise、James L. Galman、Deepankar Gahloth、Mark S. Dunstan、David Leys、Nicholas J. Turner
DOI:10.1002/adsc.201600682
日期:2016.10.20
A practical and efficient biocatalytic synthesis of aromatic d‐amino acids has been developed, based on the reductive amination of the corresponding α‐keto acids via a recombinant whole cell system composed of an engineered dehydrogenase and cofactor recycling apparatus. The reaction was shown to give excellent enantioselectivity (≥98%) and good yields at the preparative scale across a broad range