Radical Cyclisation Reactions Leading to Polycyclics Related to the Amaryllidaceae and Erythrina Alkaloids
作者:Andrew F Parsons、David A.J Williams
DOI:10.1016/s0040-4020(00)00646-3
日期:2000.9
precursors bearing unsaturated side-chains in tandem cyclisations. An octahydroindolone has been converted to the ring skeleton of γ-lycorane using samarium(II) iodide while reaction with manganese(III) acetate has been shown to yield a novel tetracyclic ring system bearing a 7-membered ring. Finally, a new tandem cyclisation of a cyclohexenone aryl halide has been shown to provide a quick approach to a 5
已经探索了由氢化三丁基锡,碘化sa(II)或乙酸锰(III)介导的新型自由基环化反应,以形成与金莲花科或刺桐相关的三环和四环系统生物碱家族。已显示具有环己烯酮环的卤代氨基甲酰胺前体可形成八氢吲哚酮,并且在串联环合反应中,由带有不饱和侧链的前体可形成赤藓烷型系统。已使用碘化((II)将八氢吲哚酮转化为γ-二十烷的环骨架,同时已显示与乙酸锰(III)的反应可产生带有7元环的新型四环系统。最后,已证明环己烯酮芳基卤化物的新串联环化为与赤藓烷天然产物有关的5,5,6,6-四环化合物提供了快速方法。