The first stereoselective synthesis of a trans-threo-trans-threo-trans terpyrrolidine was achieved. A bidirectional strategy involving double acetylide coupling of two trans-N-BOC-pyrrolidine-aldehydes 3, epimerisation-free hydrogenation and ring closure via a seven-membered cyclic sulfate gives access to the terpyrrolidine scaffold.
反式-反式-反式-反式-反式
吡咯烷的第一个立体选择性合成得以实现。双向策略涉及两个反式-N-BOC-
吡咯烷-醛3的
乙炔双偶联,无差向异构化的加氢反应和通过七元环
硫酸盐的闭环,使得进入
吡咯烷骨架成为可能。