Synthesis and deprotonation of 1-(p-toluenesulfonyl)-2-al-kenyl carbamates. Dichotomous achiral d1 and chiral d3 reagents for carbonyl addition directed by metal exchange
作者:Michael Reggelin、Petra Tebben、Dieter Hoppe
DOI:10.1016/s0040-4039(00)99157-3
日期:1989.1
title compounds 3 were prepared by electrophilic sulfonylation of allylic carbamates 1. The achiral lithium anions 4 add to carbonyl compounds with the α-position, thus permitting nucleophilic alkenoylation, whereas the chiral titanium derivates 8 undergo completely regioselective γ-addition, representing a new class of homoenolate reagents.