ent-3β,10β-dihydroxy-13-methyl-16-oxo-17,20-bisnor-8,13-isogibberellane-7,19-dioic acid 19,10β-lactone 7-methyl ester 在
四氯化碳 、
三苯基膦 作用下,
反应 4.0h,
以790 mg的产率得到ent-3α-chloro-10β-hydroxy-13-methyl-16-oxo-17,20-bisnor-8,13-isogibberellane-7,19-dioic acid 19,10β-lactone 7-methyl ester