Stereoselective synthesis of α-phenylchalcogeno-α,β-unsaturated esters
摘要:
Ethyl alpha-phenylchalcogeno alphabeta-unsaturated esters were prepared in a stereoselective manner by the reaction of ethyl propiolates with organocuprates, followed by the reaction with the appropriate electrophilic organosulfur, organoselenium or organotellurium source. (C) Elsevier Science Ltd. All rights reserved.
tetrasubstituted alkynes. Preliminary mechanistic investigations revealed a plausible radicalprocess involving a sulfur‐centered radical intermediate via iron‐mediated homolysis of the ClS bond. The resulting chlorothiolation adducts can be readily transformed to the structurally complex alkenyl sulfides by cross‐coupling reactions. The present reaction can also be applied to the complementary synthesis of the
Stereoselective synthesis of α-phenylchalcogeno-α,β-unsaturated esters
作者:Claudio C. Silveira、Antonio L. Braga、Robson B. Guerra
DOI:10.1016/s0040-4039(02)00477-x
日期:2002.4
Ethyl alpha-phenylchalcogeno alphabeta-unsaturated esters were prepared in a stereoselective manner by the reaction of ethyl propiolates with organocuprates, followed by the reaction with the appropriate electrophilic organosulfur, organoselenium or organotellurium source. (C) Elsevier Science Ltd. All rights reserved.