Catalytic enantioselective construction of quaternary stereocenters by direct vinylogous Michael addition of deconjugated butenolides to nitroolefins
作者:Madhu Sudan Manna、Vikas Kumar、Santanu Mukherjee
DOI:10.1039/c2cc31700a
日期:——
A direct vinylogous Michael reaction of gamma-substituted deconjugated butenolides with nitroolefins has been developed with the help of a newly identified quinine-derived bifunctional catalyst, allowing the synthesis of densely functionalized products with contiguous quaternary and tertiary stereocenters in excellent yield with perfect diastereoselectivity (>20:1 dr) and high enantioselectivity (up
借助新鉴定的奎宁衍生的双官能催化剂,开发了γ-取代的共轭丁烯内酯与硝基烯烃的直接乙烯基迈克尔反应,可合成具有连续四级和三级立体中心的致密功能化产物,并具有出色的非对映选择性(> 20:1 dr)和高对映选择性(高达99:1 er)。