5-[2-((1S,2R,4aS,5S)-5-Methoxycarbonyl-1,2,5-trimethyl-1,2,3,4,4a,5,6,7-octahydro-naphthalen-1-yl)-ethyl]-2-phenyl-[1,3]dioxane-4-carboxylic acid 在
对甲苯磺酸 作用下,
以
甲醇 为溶剂,
生成 (1S,5S,6R,8aS)-5-[2-((3R,4S)-4-Hydroxy-5-oxo-tetrahydro-furan-3-yl)-ethyl]-1,5,6-trimethyl-1,2,3,5,6,7,8,8a-octahydro-naphthalene-1-carboxylic acid methyl ester 、 (1S,5S,6R,8aS)-5-[2-((3R,4R)-4-Hydroxy-5-oxo-tetrahydro-furan-3-yl)-ethyl]-1,5,6-trimethyl-1,2,3,5,6,7,8,8a-octahydro-naphthalene-1-carboxylic acid methyl ester 、 (1S,5S,6R,8aS)-5-[2-((3S,4S)-4-Hydroxy-5-oxo-tetrahydro-furan-3-yl)-ethyl]-1,5,6-trimethyl-1,2,3,5,6,7,8,8a-octahydro-naphthalene-1-carboxylic acid methyl ester 、 (1S,5S,6R,8aS)-5-[2-((3S,4R)-4-Hydroxy-5-oxo-tetrahydro-furan-3-yl)-ethyl]-1,5,6-trimethyl-1,2,3,5,6,7,8,8a-octahydro-naphthalene-1-carboxylic acid methyl ester