Acetic acid (3S,5S,8S,13R,14S,17R)-17-((R)-1,5-dimethyl-hexyl)-4,4,5,13-tetramethyl-6-oxo-2,3,4,5,6,7,8,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-3-yl ester 在
methyltriphenylammonium bromide 作用下,
以
四氢呋喃 为溶剂,
反应 0.08h,
以325 mg的产率得到acetoxy-3β trimethyl-4,4,5β nor-19 bromo-7α <*>
9(10)-cholestenone-6