3β-acetoxy-5,6β-epoxy-5β-cholan-24-oic acid methyl ester 在
chromium(VI) oxide 作用下,
以
丙酮 为溶剂,
以91%的产率得到(R)-4-[(1R,3aS,4S,5S,7aR)-5-((1R,4S)-4-Acetoxy-1-methyl-2-oxo-cyclohexyl)-4-carboxymethyl-7a-methyl-octahydro-inden-1-yl]-pentanoic acid methyl ester