Acetic acid 2-((2R,5R,6R,8S,9S,10R,11R,13S,14S,16R,17R)-2,6-difluoro-5,11,17-trihydroxy-10,13,16-trimethyl-3-oxo-hexadecahydro-cyclopenta[a]phenanthren-17-yl)-2-oxo-ethyl ester 在
lithium carbonate 、 lithium bromide 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
生成 Acetic acid (2R,6R,8S,9R,10S,11S,13S,14S,16R,17R)-17-(2-acetoxy-acetyl)-9-bromo-2,6-difluoro-11-hydroxy-10,13,16-trimethyl-3-oxo-2,3,6,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl ester