(1R,4aR,8aR)-5,5,8a-Trimethyl-2-oxo-1-(3-oxo-butyl)-1,2,3,4,4a,5,8,8a-octahydro-naphthalene-1-carbaldehyde 在
吡咯烷乙酸 作用下,
以
四氢呋喃 、
甲醇 为溶剂,
以93%的产率得到rac-(1R,4a'S,8a'S)-5',5',8a'-trimethyl-3',4',4a',5',8',8a'-hexahydro-2'H-spiro[cyclohexane-1,1'-naphthalen]-2-ene-2',4-dione