alcohols. This tactic, in conjunction with a one-flask sequential cyclization, constitutes an effective general strategy for the construction of indolizidine and related alkaloids, illustrated here with the total syntheses of (−)-indolizidine 223AB (1) and alkaloid (−)-205B (2).
N-
甲苯磺酰基
氮丙啶在甲
硅烷基二
噻吩的溶剂控制的三组分链环连接中包含有效的第二亲电试剂,用于立体控制的会聚精制被保护的1,5-
氨基醇。此策略与一个烧瓶的连续环化反应一起构成了构建
吲哚利西定和相关
生物碱的有效一般策略,在此举例说明了(-)-
吲哚利西定223AB(1)和
生物碱(-)-205B的总合成(2)。