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,