rac-8-(tert-butyl) 4a-methyl (4aR,5R,8aR)-5-methyl-4,7-dioxohexahydro-2H-spiro[naphthalene-1,2'-[1,3]dioxolane]-4a,8(5H)-dicarboxylate 在
对甲苯磺酸 作用下,
以
苯 为溶剂,
以93%的产率得到8aβ-Carbomethoxy-4,4-ethylenedioxy-8β-methyl-2,3,4,4a,5,7,8,8a-octahydronaphthalene-1,6-dione