Asymmetric Reduction of 2-Chloro-3-oxo Esters by Transfer Hydrogenation
作者:Jinjin Bai、Shifeng Miao、Yun Wu、Yawen Zhang
DOI:10.1002/cjoc.201180419
日期:2011.11
Asymmetric reduction of 2‐chloro‐3‐oxoesters was achieved by catalytic transfer hydrogenation using [RuCl2(p‐cymene)](S,S)‐TsDPEN as the chiral catalyst and HCOOH‐Et3N as the hydrogen source. Moderate to good yields (up to 85%) and good enantioselectivities (up to 98% ee) were obtained.
[EN] SUBSTITUTED THIAZOLES FOR USE AS ANTIVIRAL AGENTS<br/>[FR] THIAZOLES SUBSTITUÉS UTILISÉS EN TANT QU'AGENTS ANTIVIRAUX
申请人:PURDUE RESEARCH FOUNDATION
公开号:WO2012109573A1
公开(公告)日:2012-08-16
Described herein are substituted thiazoles. Also described herein are preparations of substituted thiazoles, and the use of substituted thiazoles as antiviral agents.
Highly Diastereoselective and Enantioselective Synthesis of α-Hydroxy β-Amino Acid Derivatives: Lewis Base Catalyzed Hydrosilylation of α-Acetoxy β-Enamino Esters
By design: A series of α‐acetoxy‐β‐enamino esters 1 were synthesized and then subjected to catalytic asymmetric hydrosilylation. In the presence of a chiral Lewisbase catalyst, the reactions proceeded smoothly to provide a wide range of chiral α‐acetoxy β‐amino acid derivatives in high yields with good diastereoselectivities and enantioselectivities.
Design, Synthesis, and Biological Evaluation of Thiazoles Targeting Flavivirus Envelope Proteins
作者:Abdelrahman S. Mayhoub、Mansoora Khaliq、Richard J. Kuhn、Mark Cushman
DOI:10.1021/jm1013538
日期:2011.3.24
A series of third-generation analogues of methyl 4-(dibromomethyl)-2-(4-chlorophenyl)thiazole-5-carboxylate (1), which had the most potent antiviral activity among the first- and second-generation compounds, have been synthesized and tested against yellow fever virus using a cell-based assay. The compounds were designed with the objectives of improving metabolic stability, therapeutic index, and antiviral potency. The biological effects of C4 and C5 substitution were examined. The methylthio ester and the dihydroxpropylamide analogues had the best antiviral potencies and improved therapeutic indices and metabolic stabilities relative to the parent compound 1.