Diphenylprolinol Silyl Ether as a Catalyst in an Asymmetric, Catalytic, and Direct Michael Reaction of Nitroethanol with α,β-Unsaturated Aldehydes
作者:Hiroaki Gotoh、Daichi Okamura、Hayato Ishikawa、Yujiro Hayashi
DOI:10.1021/ol901483x
日期:2009.9.17
Diphenylprolinol silyl ether was found to be an effective organocatalyst in the enantioselective and direct Michael reaction of nitroethanol and α,β-unsaturated aldehydes, affording the 1-hydroxy-trans-3,4-disubstituted tetrahydropyrans after isomerization. The generated Michael addition products are useful synthetic intermediates, which can be converted into chiral tetrahydropyran with a quaternary
发现二苯基脯氨醇甲硅烷基醚是硝基乙醇和α,β-不饱和醛的对映选择性和直接迈克尔反应的有效有机催化剂,异构化后得到1-羟基-反式-3,4-二取代的四氢吡喃。产生的迈克尔加成产物是有用的合成中间体,可以将其转化为具有季立体中心,3-取代的顺-和反-脯氨酸以及α-氨基酸衍生物的手性四氢吡喃。