An efficient one-pot conversion of carboxylic acids into benzimidazoles <i>via</i> an HBTU-promoted methodology
作者:Leonard Barasa、Sabesan Yoganathan
DOI:10.1039/c8ra07773h
日期:——
Benzimidazole is a privileged, and routinely used pharmacophore in the drug discovery process. Herein, we report a mild, acid-free and one-potsynthesis of indole, alkyl and alpha-amino benzimidazoles through a novel HBTU-promoted methodology. An extensive library of indole-carboxylic acids, alkyl carboxylic acids and N-protected alpha-amino acids has been converted into the corresponding benzimidazoles
Highly diastereo- and enantioselective direct aldol reactions promoted by water-compatible organocatalysts bearing a pyrrolidinyl-camphor structural scaffold
the presence of water. The aldol reaction proceeded smoothly with excellent chemical yields (up to 99%), enantioselectivities (up to 99% ee), and anti-diastereoselectivities (up to 99:1) with a catalytical amount of the bifunctional organocatalysts (20 mol %) under optimal reaction conditions. Mechanistic transition models are proposed and the stereochemical bias of the asymmetric aldol reaction is
Highly enantioselective aldol reactions using N-arylprolinamides with enhanced acidity and double H-bonding potential
作者:Satyajit Saha、Jarugu Narasimha Moorthy
DOI:10.1016/j.tetlet.2009.12.014
日期:2010.2
binding of electrophilicaldehydes via two N–H⋯O hydrogen bonds for application in organocatalytic aldol reactions. The catalyst 10 is shown to afford aldol products in excellent isolated yields with very high diastereo- and enantioselectivites. In addition to enhanced acidity and double hydrogen bonding, the stacking interactions of the p-toluenesulfonyl ring in 10 with the electrophilicaldehyde are proposed
Bacterial peptide deformylase (PDF) belongs to a subfamily of metalloproteases catalyzing the removal of the N-terminal formyl group from newly synthesized proteins. We report the synthesis and biological activity of highly potent inhibitors of Mycobacterium tuberculosis (Mtb) PDF enzyme as well as the first X-ray crystal structure of Mtb PDF. Structure-activity relationship and crystallographic data clarified the structural requirements for high enzyme potency and cell based potency. Activities against single and multi-drug-resistant Mtb strains are also reported.