The Thionium/N-Acyliminium Ion Cyclization Cascade as a Strategy for the Synthesis of Azapolycyclic Ring Systems
作者:Albert Padwa、Alex G. Waterson
DOI:10.1016/s0040-4020(00)00861-9
日期:2000.12
thiophenyl lactams with BF3·2AcOH which resulted in the generation of an N-acyliminiumion. Cyclization of the iminium ion onto the tethered aromatic ring led to various azapolycyclic ring systems. A related cyclization sequence also occurred with amidosulfoxides that possess simple olefinic tethers. The method was applied toward the synthesis of a member of the protoberberine alkaloid family.