(1S,4R)-4,7,7-Trimethyl-3-oxo-2-oxa-bicyclo[2.2.1]heptane-1-carboxylic acid (4bS,8aS,9S)-7-[1-ethoxycarbonyl-meth-(E)-ylidene]-2-methoxy-4b,5,6,7,8,8a,9,10-octahydro-phenanthren-9-yl ester 在
potassium carbonate 作用下,
以
乙醇 为溶剂,
反应 2.0h,
生成
ethyl (E)-(4aS,10S,10aS)-10-hydroxy-7-methoxy-3,4,4a,9,10,10a-hexahydrophenanthren-2(1H)-ylideneacetate