三氟乙酸乙酯 、
24-phenylsulphonylchol-5-en-3β-ol 3-tetrahydropyranyl ether 以
四氢呋喃 为溶剂,
反应 1.5h,
以78%的产率得到(R)-3-Benzenesulfonyl-6-[(3S,8S,9S,10R,13R,14S,17R)-10,13-dimethyl-3-(tetrahydro-pyran-2-yloxy)-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]-1,1,1-trifluoro-heptan-2-one