Acetic acid (4aR,5S)-7-isopropyl-4a-methyl-8-oxo-1,4,4a,5,6,7,8,8a-octahydro-1,4-methano-naphthalen-5-yl ester 在
potassium permanganate 、
silica gel 作用下,
以
苯 为溶剂,
以62%的产率得到(1S,3R,3aS,4S)-4-Acetoxy-6-isopropyl-3a-methyl-7-oxo-octahydro-indene-1,3-dicarboxylic acid