methyl 2-[(2'S,3S,4aS,8R,8aS)-3-(chloromethylsulfonyloxy)-2',4,4,7,8a-pentamethylspiro[2,3,4a,5-tetrahydro-1H-naphthalene-8,5'-oxolane]-2'-yl]acetate 在
18-冠醚-6 、
cesium acetate 作用下,
以
苯 为溶剂,
反应 72.0h,
生成 methyl 2-[(2'S,4aS,8R,8aS)-2',4,4,7,8a-pentamethylspiro[4a,5-dihydro-1H-naphthalene-8,5'-oxolane]-2'-yl]acetate 、 methyl 2-[(2'S,3R,4aS,8R,8aS)-2',3,7,8a-tetramethyl-4-methylidenespiro[2,3,4a,5-tetrahydro-1H-naphthalene-8,5'-oxolane]-2'-yl]acetate