Tackling Reactivity and Selectivity within a Strained Architecture: Construction of the [6–6–5–7] Tetracyclic Core of <i>Calyciphylline</i> Alkaloids
作者:Chen Xu、Lu Wang、Xiaojiang Hao、David Zhigang Wang
DOI:10.1021/jo300776d
日期:2012.7.20
A stereochemically controlled route to the enantiopure [6–6–5–7] tetracyclic core of Calyciphylline A class alkaloids was established, which involves Overman rearrangement, [2 + 2] photochemical cycloaddition, Grob fragmentation, C–N bond-forming nucleophilic displacement, and ring strain-directed hydrogenation as strategic steps.
建立了立体化学控制的途径,形成对映体纯的[6–6–5–7]茶碱A类生物碱,涉及超载重排,[2 + 2]光化学环加成,Grob断裂,C–N键形成亲核取代,以及将环应变定向氢化作为战略性步骤。