[(1R,4R,5R,7R,9R,10S,13R)-5-methoxycarbonyl-9-methyl-14-methylidene-15-oxo-7-tetracyclo[11.2.1.01,10.04,9]hexadecanyl] (4S,5R)-2,4-diphenyl-4,5-dihydro-1,3-oxazole-5-carboxylate 在
对甲苯磺酸 作用下,
以
二氯甲烷 为溶剂,
反应 96.0h,
以75%的产率得到methyl (1R,4R,5R,7R,9R,10S,13R)-7-[(2R,3S)-3-benzamido-2-hydroxy-3-phenylpropanoyl]oxy-9-methyl-14-methylidene-15-oxotetracyclo[11.2.1.01,10.04,9]hexadecane-5-carboxylate