Asymmetric base hydrolysis of α-chiral esters with synthetic small-molecule catalysts is described. Quaternary ammonium salts derived from quinine were used as chiral phase-transfer catalysts to promote the base hydrolysis of N-protected aminoacid hexafluoroisopropyl esters in a CHCl3/NaOH (aq) via dynamic kinetic resolution, providing the corresponding products in moderate to good yields (up to 99%)
Discovery of a series of novel compounds with moderate anti-hepatitis C virus NS3 protease activity in vitro
作者:Fangyuan Shi、Yingjie Zhang、Wenfang Xu
DOI:10.1016/j.bmc.2015.07.032
日期:2015.9
The hepatitis C virus (HCV) NS3/4A protease that plays an important role in the viral life cycle has been proven to be an excellent target for the discovery of anti-HCV drugs. Enlightened by some P2-triazole and amide compounds, which had been found as HCV NS3 protease inhibitors, we designed and synthesized a series of novel compounds by incorporating different amino acid residues in P1/P1' and P3/P3' position to develop novel antiviral agents. The result of enzyme inhibition assay indicated that all the designed compounds showed moderate anti-HCV NS3 protease activity. On the basis of the biological result, a detailed structure-activity relationship (SAR) was derived and discussed. (C) 2015 Elsevier Ltd. All rights reserved.
Pd-Catalyzed Enantioselective C–H Iodination: Asymmetric Synthesis of Chiral Diarylmethylamines
作者:Ling Chu、Xiao-Chen Wang、Curtis E. Moore、Arnold L. Rheingold、Jin-Quan Yu
DOI:10.1021/ja408864c
日期:2013.11.6
An enantioselective C-H iodination reaction using a mono-N-benzoyl-protected amino acid has been developed for the synthesis of chiral diarylmethylamines. The reaction uses iodine as the sole oxidant and proceeds at ambient temperature and under air.