A modular approach to a wide range of 1-cyano-3-(hetero)arylindolizines through aldol-cyclopropanation-oxidative cycloisomerization is described where DDQ was utilized for the regioselective synthesis of the pyrrole units from cyclopropyl pyridines for the first time. A key to success is regioselective oxidation of benzylic position by DDQ, which enabled us to access to one regioisomer out of two possible
描述了一种通过醛醇-
环丙烷化-氧化环异构化制备各种 1-
氰基-3-(杂)芳基
吲哚嗪的模块化方法,其中
DDQ 首次用于从环丙基
吡啶中区域选择性合成
吡咯单元。成功的关键是
DDQ 对苄基位置的区域选择性氧化,这使我们能够从两种可能的区域异构体中获得一种。在
DDQ 存在下,中氮
茚 C2、C5 或 C7 位点的同源二聚化也首次被发现。