ent-13-acetoxy-3α-bromo-10-hydroxy-16-oxo-17,20-dinorgibberellane-7,19-dioic acid 19,10-lactone 7-methyl ester 在
吡啶 、
1,8-二氮杂双环[5.4.0]十一碳-7-烯 作用下,
反应 1.0h,
以10 mg的产率得到ent-13-acetoxy-10-hydroxy-16-oxo-17,20-dinorgibberell-2-ene-7,19-dioic acid 19,10-lactone 7-methyl ester