Enantioselective synthesis of the piperidine alkaloids, (-)-adaline (1) and (-)-euphococcinine (2), were achieved from 7 in a six-step sequence through stepwise allylic transfer reactions. Dramatic additive effect of Bu3SnF for the conversion of 3 into 9 was observed to expedite the process to afford the cyclized products in good yields.
通过逐步烯丙基转移反应,以 7 为原料,分六步实现了
哌啶生物碱 (-)-adaline (1) 和 (-)-euphococcinine (2) 的对映选择性合成。在将 3 转化为 9 的过程中,观察到 Bu3SnF 具有显著的加成效应,可加快这一过程,从而以良好的产率获得环化产物。