dibutyl diazomalonate 、 Formic acid (5R,7R,10S,12S,13R,17R)-12-formyloxy-10,13-dimethyl-17-((R)-1-methyl-allyl)-3-oxo-hexadecahydro-cyclopenta[a]phenanthren-7-yl ester 在
copper(l) iodide 、
dibutylstibine 作用下,
以
苯 为溶剂,
生成 3-
-7α,12α-bisformyloxy-24-nor-5β-cholan-3(4),22(23)-diene 、 3--7α,12α-bisformyloxy-24-nor-5β-cholan-2(3),22(23)-diene 、 3-[(5S,7R,10S,12S,13R,17R)-7,12-Diformyloxy-10,13-dimethyl-17-((R)-1-methyl-allyl)-hexadecahydro-cyclopenta[a]phenanthren-3-ylidene]-pentanedioic acid di-tert-butyl ester