3β-acetoxy-16α-nitromethyl-5-pregnan-20-one 、
1,2:3,4-di-O-isopropylidene-6-O-(prop-2-ynyl)-α-D-galactopyranoside 在
异氰酸苯酯 、
三乙胺 作用下,
以
苯 为溶剂,
以64%的产率得到[(3S,8S,9S,10R,13S,14S,16R,17S)-17-acetyl-10,13-dimethyl-16-[5-[[(1S,2R,6R,8R,9S)-4,4,11,11-tetramethyl-3,5,7,10,12-pentaoxatricyclo[7.3.0.02,6]dodecan-8-yl]methoxymethyl]-1,2-oxazol-3-yl]-2,3,4,7,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3-yl] acetate