7',7'-Dimethyl-3',7',8',8a'-tetrahydrospiro<1,3-dioxolan-2,5'(6'H)-<3,8a>epoxynaphthalin>-1',2'-dicarbonsaeure-dimethylester 在
对甲苯磺酸 作用下,
以
1,4-二氧六环 为溶剂,
以62%的产率得到3-Hydroxy-7,7-dimethyl-5-oxo-5,6,7,8-tetrahydronaphthalin-1,2-dicarbonsaeure-dimethylester