(8S,11R,13S,14S,17S)-17-hydroxy-11-[4-((RS)-1-hydroxyethyl)phenyl]-13-methyl-17-pentafluoroethyl-1,2,6,7,8,11,12,13,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-3-one 、
溴乙酸叔丁酯 在
四丁基硫酸氢铵 、 potassium hydroxide 作用下,
以
二氯甲烷 为溶剂,
反应 2.0h,
以21%的产率得到{(1RS)-1-[4-((8S,11R,13S,14S,17S)-17-hydroxy-13-methyl-3-oxo-17-pentafluoroethyl-2,3,6,7,8,11,12,13,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-11-yl)-phenyl]ethoxy}acetic acid tert-butyl ester