(3E,4S)-3-[2-[(4aR,6aR,7S,8S,10aS,10bR)-6a,10b-dimethylspiro[1,4a,5,6,7,9,10,10a-octahydronaphtho[2,1-d][1,3]dioxine-8,2'-oxirane]-7-yl]ethylidene]-4-hydroxyoxolan-2-one 在
硫酸 作用下,
以
甲醇 为溶剂,
反应 10.0h,
以25%的产率得到3-((4aR,4bS,6aS,9R,10aS,10bR,12aR)-6a-methoxy-4a,10b-dimethyldodecahydro-4H,6H-[1,3]dioxino[5',4':3,4]benzo[1,2-f]isochromen-9-yl)furan-2(5H)-one