By using an N-heterocyclic carbene catalyst bearing a hydroxyl moiety, the asymmetric formal (3 + 2) cyclization of aryl 3-bromoenals and isatins was achieved to produce a series of chiral spirooxindole–butenolides including an alkenyl-substituted compound, which underwent benzannulations with benzynes to form intriguing spirocyclic scaffolds.
通过使用带有羟基部分的N-杂环卡宾催化剂,芳基3-
溴烯醛和isatins的不对称形式(3 + 2)环化反应产生了一系列手性螺环
吲哚-
丁烯内酯,其中包括被烯基取代的烯基取代化合物。与苯并炔形成有趣的螺环骨架。