Methanesulfonic acid (1S,2S,4R,8S,9S,11R,12S)-8-(tert-butyl-dimethyl-silanyloxy)-1-hydroxy-11-(4-methoxy-benzyloxy)-9,15,15-trimethyl-5-methylene-10-oxo-tricyclo[10.2.1.04,9]pentadec-2-yl ester 在
1,8-二氮杂双环[5.4.0]十一碳-7-烯 作用下,
以
苯 为溶剂,
反应 32.0h,
以65%的产率得到(Z)-(1S,2R,4S,5S,9R,12R)-5-(tert-Butyl-dimethyl-silanyloxy)-12-hydroxy-2-(4-methoxy-benzyloxy)-4,15,15-trimethyl-8-methylene-tricyclo[10.2.1.0
4,9]pentadec-10-en-3-one