One-step Direct Conversion of Heterocyclic Aldehydes to Esters
作者:Shyamaprosad Goswami、Anita Hazra
DOI:10.1246/cl.2009.484
日期:2009.5.5
One-step direct conversion of a series of heterocyclic aldehydes to heterocyclic esters is reported here by the use of thiamine hydrochloride as a catalyst in the absence of nitrogen atmosphere in ...
Sodium Cyanoborohydride–Mediated Direct Conversion of Some Heterocyclic Aldehydes to Esters
作者:Shyamaprosad Goswami、Anita Hazra、Jia Hao Goh、Hoong-Kun Fun
DOI:10.1080/00397911.2010.502988
日期:2011.9.1
An exceptional oxidizing behavior of sodium cyanoborohydride is observed where electron-withdrawing heterocyclic aldehydes are directly converted to their corresponding esters on treatment of sodium cyanoborohydride in methanol. The spectral analysis and single-crystal structure confirm the formation of esters.
[EN] A PROCESS FOR SYNTHESIS OF SYN AZIDO EPOXIDE AND ITS USE AS INTERMEDIATE THE SYNTHESIS OF AMPRENAVIR & SAQUINAVIR<br/>[FR] PROCÉDÉ POUR LA SYNTHÈSE D' AZIDO-ÉPOXYDE SYNTHÉTIQUE ET SON UTILISATION EN TANT QU'INTERMÉDIAIRE DE LA SYNTHÈSE D'AMPRÉNAVIR ET DE SAQUINAVIR
申请人:COUNCIL SCIENT IND RES
公开号:WO2013105118A1
公开(公告)日:2013-07-18
Disclosed herein is a novel route of synthesis of syn azide epoxide of formu 5, which is used as a common intermdeiate for asymmetric synthesis of HIV protease inhibitors such as Amprenavir, Fosamprenavir, Saquinavir and formal synthesis of Darunavir and Palinavir obtained by Cobalt- catalyzed hydrolyti kinetic resolution of racemic anti-(2SR, 3SR) - 3 -azido - 4 -phenyl - 1, 2- epoxybutane (azido-epoxide).