(E)-2-(11-Acetylamino-4,11-dimethyl-2-methylene-3-aza-tricyclo[5.3.1.0
4,9]undec-3-yl)-but-2-enedioic acid dimethyl ester 在
silica gel 作用下,
以
二氯甲烷 为溶剂,
以95%的产率得到methyl (E)-(exo-11-acetamino-9a,endo-11-dimethyl-2-oxo-1,2,3,4,4a,6,7,8,9,9a-decahydro-4,7-methanopyrrolo[1,2-a]quinolin-1-ylidene)ethanoate