Studies on structurally simple αβ-butenolides. IV. behaviour of protoanemonin as electrophile towards alcohols and thiols
作者:A. Calderon、J. Font、R.M. Ortun¯o
DOI:10.1016/s0040-4020(01)88808-6
日期:1984.1
Protoanemonin, reacts in different ways with thiolate and alkoxide anions. Thus, while the very soft nucleophile benzenethiolate attacks exclusively the olefinic carbons of 1, alkoxides always attack the carbonyl group in the first step of the reaction. In intermediate cases, when neither very hard nor very soft nucleophiles are used, regioselectivity is not observed. Mechanisms are discussed to explain
原烟碱与硫醇盐和醇盐阴离子发生不同的反应。因此,尽管非常柔软的亲核试剂苯硫醇盐仅攻击1的烯烃碳,但是在反应的第一步中,醇盐总是攻击羰基。在中间情况下,当既不使用非常硬也不是非常柔软的亲核试剂时,则没有观察到区域选择性。讨论了解释这种差异反应性的机制。