((2R,4aR,4bR,7S,8S,8aR,10R)-7-Acetoxy-8-acetoxymethyl-10-hydroxy-2,4b,8-trimethyl-2,3,4,4a,4b,5,6,7,8,8a,9,10-dodecahydro-phenanthren-2-yl)-acetic acid methyl ester 、
原乙酸三乙酯 在
丙酸 作用下,
反应 6.0h,
以400 mg的产率得到((1S,2R,4aR,4bR,7S,8S,8aR)-7-Acetoxy-8-acetoxymethyl-1-methoxycarbonylmethyl-2,4b,8-trimethyl-1,2,3,4,4a,4b,5,6,7,8,8a,9-dodecahydro-phenanthren-2-yl)-acetic acid methyl ester