(1R,3S,4R,5R,9R,10R,13R,14R,17R)-1-[tert-butyl(dimethyl)silyl]oxy-17-[(2R)-5-[tert-butyl(dimethyl)silyl]oxypentan-2-yl]-4,10,13,14-tetramethyl-4-(phenylmethoxymethyl)-2,3,5,6,9,11,12,15,16,17-decahydro-1H-cyclopenta[a]phenanthren-3-ol 、
苯甲酰氯 在
4-二甲氨基吡啶 作用下,
以
二氯甲烷 为溶剂,
反应 3.0h,
以85%的产率得到[(1R,3S,4R,5R,9R,10R,13R,14R,17R)-1-[tert-butyl(dimethyl)silyl]oxy-17-[(2R)-5-[tert-butyl(dimethyl)silyl]oxypentan-2-yl]-4,10,13,14-tetramethyl-4-(phenylmethoxymethyl)-2,3,5,6,9,11,12,15,16,17-decahydro-1H-cyclopenta[a]phenanthren-3-yl] benzoate