Intramolecular Conjugate Displacement: A General Route to Hexahydroquinolizines, Hexahydroindolizines, and Related [<i>m</i>,<i>n</i>,0]-Bicyclic Structures with Nitrogen at a Bridgehead
作者:Derrick L. J. Clive、Zhiyong Li、Maolin Yu
DOI:10.1021/jo070664s
日期:2007.7.1
classical Morita−Baylis−Hillman reaction (cf. 2 → 3) or by condensation with selenium-stabilized carbanions, followed by oxidation (cf. 2 → 8 → 3). The derived acetates undergo cyclization when the nitrogen protecting group is removed, affording [m,n,0]-bicyclic structures with nitrogen at a bridgehead (cf. 4 → 5 → 6). Formation of bicyclic structures via the reactions of Schemes 1 and 2 is general,
通过经典的森田-贝利斯-希尔曼反应(参见2 → 3)或与硒稳定的碳负离子缩合,然后氧化(参见2 → 8 → 3),可以将N-保护的氨基醛转化为烯丙醇。当除去氮保护基时,衍生的乙酸酯进行环化,在桥头处提供具有氮的[ m,n,0]双环结构(参见4 → 5 → 6)。通常通过方案1和2的反应形成双环结构,并且保留了起始氨基醛的立体化学。