Ynamide Preactivation Allows a Regio- and Stereoselective Synthesis of α,β-Disubstituted Enamides
作者:Lucas L. Baldassari、Aurélien de la Torre、Jing Li、Diogo S. Lüdtke、Nuno Maulide
DOI:10.1002/anie.201709128
日期:2017.12.4
Activate first, attack later: Thanks to an ynamide preactivation strategy, otherwise incompatible reagents can be used to prepare α,β-disubstituted enamides with high regio- and stereoselectivity. Mechanistic analysis reveals the intermediacy of a triflate-bound species as a solution-stable, effective keteniminium reservoir, which is amenable to the subsequent addition of organometallic reagents.
首先激活,然后攻击:由于采用了乙酰胺预激活策略,否则可以使用不相容的试剂来制备具有高区域和立体选择性的α,β-二取代的乙酰胺。机理分析表明,三氟甲磺酸盐结合的物种作为溶液稳定的有效酮亚胺储存库的中间产物,适于随后添加有机金属试剂。