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。