2-[(3R,4S,5S,8S,9S,10S,11R,13R,14S,16S)-3-Acetoxy-11-hydroxy-16-(2-hydroxy-ethylsulfanyl)-4,8,10,14-tetramethyl-hexadecahydro-cyclopenta[a]phenanthren-(17Z)-ylidene]-6-methyl-hept-5-enoic acid 4-nitro-benzyl ester 在
dimethyl-phenoxymethylene-ammonium bromide 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
生成 2-[(3R,4S,5S,8S,9S,10S,11R,13R,14S,16S)-3-Acetoxy-16-(2-bromo-ethylsulfanyl)-11-hydroxy-4,8,10,14-tetramethyl-hexadecahydro-cyclopenta[a]phenanthren-(17Z)-ylidene]-6-methyl-hept-5-enoic acid 4-nitro-benzyl ester