Acetic acid (1S,6R,7R,8R,8aR)-6-acetoxy-8-benzyloxy-7-bromo-5-oxo-octahydro-indolizin-1-yl ester 在
氯化亚砜 、 2-tert-butylamino-2-diethylamino-1,3-dimethylperhydro-1,3,2-diazaphosphorine 作用下,
生成
(1S,6S,7S,8R,8aS)-8-(Benzyloxy)-6,7-epoxy-1-hydroxyoctahydroindolizidin-5-one