2-Ethoxy-5,6,7,8-tetrahydro-7-(3,4,5,6-tetrahydro-2H-thiopyran-3-yl)spiro<4H-chromen-4,1'-cyclopropan>-5-on 在
sodium hydrogen sulfate 作用下,
以
二氯甲烷 为溶剂,
反应 24.0h,
以74%的产率得到2-<1-<2-Hydroxy-4-(3,4,5,6-tetrahydr-2H-thiopyran-3-yl)-6-oxo-1-cyclohexen-1-yl>cyclopropyl>essigsaeure-ethylester