Trifluoro-acetic acid (8R,9S,10R,13S,14S,17R)-17-acetyl-10,13-dimethyl-3-oxo-2,3,6,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl ester 在
1,5-Diazabicyclo[5.4.0]undec-5-ene 作用下,
以
苯 为溶剂,
反应 24.0h,
以80%的产率得到5'-(trifluoromethyl)-(17R)-spiro
-3,3'-dione