3-O-benzyl-1,2-O-isopropylidene-5-O-propargyl-α-D-xylofuranose 、
3β-acetoxy-16α-nitromethyl-5-pregnan-20-one 在
异氰酸苯酯 、
三乙胺 作用下,
以
苯 为溶剂,
以62%的产率得到[(3S,8S,9S,10R,13S,14S,16R,17S)-16-[5-[[(3aR,5R,6S,6aR)-2,2-dimethyl-6-phenylmethoxy-3a,5,6,6a-tetrahydrofuro[2,3-d][1,3]dioxol-5-yl]methoxymethyl]-1,2-oxazol-3-yl]-17-acetyl-10,13-dimethyl-2,3,4,7,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3-yl] acetate