泼尼松 、
5-norbornene-endo-2-carbonyl chloride 在
吡啶 作用下,
反应 0.5h,
以60%的产率得到2-((8S,9S,10R,13S,14S,17R)-17-hydroxy-10,13-dimethyl-3,11-dioxo-6,7,8,9,10,11,12,13,14,15,16,17-dodecahydro-3H-cyclopenta[a]phenanthren-17-yl)-2-oxoethyl bicyclo[2.2.1]hept-5-ene-2-carboxylate