Synthesis of enantiopure triazolium salts from pyroglutamic acid and their evaluation in the benzoin condensation
作者:Dieter Enders、Jianwei Han
DOI:10.1016/j.tetasy.2008.05.017
日期:2008.6
A family of enantiopure 1,2,4-triazolium salts were prepared starting from the inexpensive (S)-pyroglutamic acid. After treatment with base, the corresponding N-heterocyclic carbenes were tested as organo-catalysts in the asymmetric benzoin condensation and gave good yields and up to 95% ee. (C) 2008 Elsevier Ltd. All rights reserved.