(1S,5S,6R,8aS)-5-[3-Carboxy-3-(2,2-dimethyl-[1,3]dioxolan-4-yl)-propyl]-1,5,6-trimethyl-1,2,3,5,6,7,8,8a-octahydro-naphthalene-1-carboxylic acid methyl ester 在
对甲苯磺酸 作用下,
以
甲醇 为溶剂,
生成 (1S,5S,6R,8aS)-5-[2-((3S,4S)-4-Hydroxy-2-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-2-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,4S)-4-Hydroxy-2-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-2-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