Efficient Baylis–Hillman reactions promoted by mild cooperative catalysts and their application to catalytic asymmetric synthesis
作者:Yoichi M.A Yamada、Shiro Ikegami
DOI:10.1016/s0040-4039(00)00125-8
日期:2000.3
Baylis–Hillmanreactions were promoted by mild cooperative catalysts of tributylphosphine with phenols such as (±)-1,1′-bi-2-naphthol (BINOL) in THF to give α-methylene-β-hydroxyalkanones in high yield. The reactions proceeded much faster in the presence of 1,1′-bi-2-naphthol than in its absence. The 1H NMR studies suggested that 1,1′-bi-2-naphthol functions as a Brønsted acid to activate the carbonyl
三丁基膦与酚类的温和协同催化剂(例如(±)-1,1'-联-2-萘酚(BINOL)在THF中)促进了Baylis-Hillman反应,从而以高收率得到α-亚甲基-β-羟基链烷酮。在有1,1'-联-2-萘酚存在下,该反应进行得比在没有它的情况下进行得快得多。的1项1 H NMR研究表明,1,1'-联-2-萘酚用作布朗斯台德酸来激活醛和偏振烯烃的羰基。通过使用三丁基膦与钙手性催化剂的协同催化剂来检查反应在催化不对称合成中的应用,以相当好的收率得到具有相当好的%ee的所需产物。