N-Heterocyclic Carbene-Catalyzed Enantioselective Synthesis of N-Fused Polycyclic Dihydropyrido[1,2-α]-indolones
作者:Ting Yao、Jia Li、Changgui Zhao
DOI:10.1021/acs.orglett.3c01756
日期:2023.7.14
An NHC-catalyzed enantioselective annulation reaction of enals with an activated ketone is disclosed. The approach proceeds from a formal [3 + 2] annulation of homoenolate with activated ketone and a subsequent ring expansion of γ-lactone by the nitrogen atom of indole. This strategy features a broad substrate scope, affording the corresponding DHPIs in moderate to good yields and with excellent levels
公开了烯醛与活化酮的NHC催化的对映选择性成环反应。该方法从高烯醇化物与活化酮的正式[3 + 2]环化以及随后通过吲哚氮原子对γ-内酯进行环扩展开始。该策略具有广泛的底物范围,以中等至良好的产率提供相应的 DHPI,并具有出色的对映选择性水平。已经进行了对照实验来阐明合理的机制。