Olefination with Sulfonyl Halides and Esters: Scope, Limitations, and Mechanistic Studies of the Hawkins Reaction
作者:Bartosz Górski、Alicja Talko、Tymoteusz Basak、Michał Barbasiewicz
DOI:10.1021/acs.orglett.7b00517
日期:2017.4.7
Carbanions of alkanesulfonyl halides and esters react with nonenolizable carbonyl compounds to give olefins. Mechanistic studies reveal that initial aldol-type addition of the carbanions is followed by cyclization–fragmentation to alkenes, and the leaving group on the sulfonyl moiety (RSO2X) controls carbanion stability and rate of the olefin formation.
链烷磺酰基卤化物和酯的碳负离子与不可烯化的羰基化合物反应生成烯烃。机理研究表明,最初的碳氢化合物以醛醇缩合形式加成环基后再裂解成烯烃,而磺酰基部分上的离去基团(RSO 2 X)控制着碳负离子的稳定性和烯烃形成的速率。