Enantioselective synthesis of functionalized 2-amino-4H-chromenes via the o-quinone methides generated from 2-(1-tosylalkyl)phenols
作者:Bo Wu、Xiang Gao、Zhong Yan、Wen-Xue Huang、Yong-Gui Zhou
DOI:10.1016/j.tetlet.2015.05.076
日期:2015.7
An efficient bifunctional squaramide-catalyzed Michael addition/cyclization reaction of o-quinone methides generated in situ from 2-(1-tosylalkyl)phenols with active methylene compounds bearing a cyano group has been realized to synthesize chiral 2-amino-4H-chromenes with excellent enantioselectivities and broad substrate scope.
已经实现了由2-(1-甲苯磺基烷基)苯酚与带有氰基的活性亚甲基化合物就地生成的邻苯二甲酰基甲烷的高效双官能方酰胺催化的迈克尔加成/环化反应,以合成手性2-氨基-4 H-色烯具有出色的对映选择性和广泛的底物范围。