雌酚酮 、
tetraethyl 2-(2,2-dimethyl-1,3-dioxane-4,6-dione)ethylene bisphosphonate 以
甲苯 为溶剂,
反应 2.5h,
以77%的产率得到4,4-Bis-(diethoxy-phosphoryl)-butyric acid (8R,9S,13S,14S)-13-methyl-17-oxo-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthren-3-yl ester