地塞米松 、
5-norbornene-endo-2-carbonyl chloride 在
吡啶 作用下,
反应 0.5h,
以55%的产率得到[2-[(8S,9R,10S,11S,13S,14S,16R,17R)-9-fluoro-11,17-dihydroxy-10,13,16-trimethyl-3-oxo-6,7,8,11,12,14,15,16-octahydrocyclopenta[a]phenanthren-17-yl]-2-oxoethyl] bicyclo[2.2.1]hept-5-ene-2-carboxylate