(1R,4aR,10aR)-7,8-Dihydroxy-7-isopropyl-1,4a-dimethyl-1,2,3,4,4a,4b,5,6,7,8,10,10a-dodecahydro-phenanthrene-1-carboxylic acid 在
lead(IV) acetate 、
对甲苯磺酸 作用下,
生成
(1R,4aR,8aR)-6-[1,3]Dioxan-2-yl-1,4a-dimethyl-5-(4-methyl-3-oxo-pentyl)-1,2,3,4,4a,5,8,8a-octahydro-naphthalene-1-carboxylic acid methyl ester