[(8S,9S,10R,13R,14S,17R)-10,13-dimethyl-17-[(2R)-6-methylheptan-2-yl]-2,3,4,7,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3-yl] N-(2-bromoethyl)carbamate 在
吡啶 、 potassium hydroxide 作用下,
以
二氯甲烷 、
N,N-二甲基甲酰胺 为溶剂,
反应 21.5h,
生成 2-[[(8S,9S,10R,13R,14S,17R)-10,13-dimethyl-17-[(2R)-6-methylheptan-2-yl]-2,3,4,7,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3-yl]oxycarbonylamino]ethyl 5-methyl-2-oxo-1,3-dioxane-5-carboxylate