Asymmetric epoxidation of α,β-unsaturated ketones via an amine-thiourea dual activation catalysis
作者:Lu-Wen Zhang、Li Wang、Nan Ji、Si-Yang Dai、Wei He
DOI:10.1016/j.tetlet.2021.152941
日期:2021.3
A simple asymmetric epoxidation method is developed to effectively synthesize chiral α-carbonyl epoxides through an amine-thiourea dual activation catalysis. In this method, TBHP, as an oxidant, determined the reaction rate, and the chiral amine-thiourea catalyst effectively controlled the stereoselectivity of the reaction, and KOH promoted deprotonation. 22 examples of α,β-unsaturated ketones with
开发了一种简单的不对称环氧化方法,通过胺-硫脲双重活化催化有效合成手性α-羰基环氧化物。在该方法中,TBHP作为氧化剂确定了反应速率,手性胺-硫脲催化剂有效地控制了反应的立体选择性,而KOH促进了去质子化。具有各种取代基的22个α,β-不饱和酮的实例被平滑地转化为具有中等至优异对映体过量的α-羰基环氧化物。