The total synthesis of racemic tubotaiwine 8 has been achieved from the tetracyclic intermediate 1, the key steps being the construction of the C(7)-quaternary centre by cyclization of a thionium ion upon the indole 3-position and the introduction of the C(16)-methoxycarbonyl substituent by photochemical rearrangement of the N-methoxycarbonylenamine 7.
已经从四环中间体1中实现了消旋性 tubotaiwine 8 的总合成,其关键步骤是通过在
吲哚3位上的环化反应构建C(7)-季
铵中心,以及通过N-甲氧基羰基胺7的光
化学重排引入C(16)-甲氧基羰基取代基。