Asymmetric Reaction of <i>p</i>-Quinone Diimide: Organocatalyzed Michael Addition of α-Cyanoacetates
作者:Sivakumar N. Reddy、Venkatram R. Reddy、Shrabani Dinda、Jagadeesh Babu Nanubolu、Rajesh Chandra
DOI:10.1021/acs.orglett.8b00771
日期:2018.5.4
Hitherto unknown catalytic enantioselective transformation of p-quinone diimides is achieved using chiral bifunctional organic molecules. Bifunctional thiourea compounds catalyze the Michael addition of cyanoacetates with excellent yields and enantioselectivities. The initially formed Michael adducts undergo cyclization to yield functionally rich, fused cyclic imidines bearing a quaternary benzylic
使用手性双官能有机分子可实现对-醌二酰亚胺的迄今未知的催化对映选择性转化。双官能硫脲化合物以优异的产率和对映选择性催化氰基乙酸酯的迈克尔加成。最初形成的迈克尔加合物进行环化,生成功能丰富的稠合环状亚胺,其带有季苄基手性中心。竞争过渡态(TSs)的密度泛函理论计算被用来解释观察到的立体化学结果。