(1R,2R,8S,9R,10R,13R,14S,17S)-17-Acetyl-4,4,9,13,14-pentamethyl-1,4,7,8,9,10,12,13,14,15,16,17-dodecahydro-2H-20-oxa-cyclopropa[1,2]cyclopenta[a]phenanthrene-3,11-dione 在
氢溴酸 作用下,
以
氯仿 为溶剂,
生成
1β-Brom-2α-hydroxy-4,4,14α-trimethyl-19(10->9β)-abeo-10α-pregn-5-en-3,11,20-trion