(S)-3-Hydroxy-3-methyl-5-((S)-2,5,5,8a-tetramethyl-3,4,4a,5,6,7,8,8a-octahydro-naphthalen-1-yl)-pentanoic acid methyl ester 在
chromium(VI) oxide 、
硫酸 作用下,
以
丙酮 为溶剂,
以60%的产率得到(S)-3-Hydroxy-3-methyl-5-((4aS,8aS)-2,5,5,8a-tetramethyl-3-oxo-3,4,4a,5,6,7,8,8a-octahydro-naphthalen-1-yl)-pentanoic acid methyl ester