4β-acetoxy-3'α,4'-epoxy-1-formyl-3-hydroxy-16-methoxy-(4'α
H)-22-nor-vincaleukoblast-6-ene-23,22'-dioic acid dimethyl ester 在
碘 、
碳酸氢钠 作用下,
以
四氢呋喃 为溶剂,
生成
4β-acetoxy-3'α,4'-epoxy-1-formyl-3-hydroxy-16-methoxy-19'-oxo-(4'αH)-22-nor-vincaleukoblast-6-ene-23,22'-dioic acid dimethyl ester