dimethyl (1r,1'R,4'S,5'S,8'R)-3-(propan-2-ylidene)-1',2',3',4',5',8'-hexahydrospiro[cyclopentane-1,9'-[1,4:5,8]dimethanonaphthalene]-6',7'-dicarboxylate 在
chromium(III) sulfate 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
反应 0.5h,
以52%的产率得到rac-dimethyl (1R,1'R,4'S,5'S,6'R,7'R,8'R)-3-(propan-2-ylidene)-1',2',3',4',5',6',7',8'-octahydrospiro[cyclopentane-1,9'-[1,4:5,8]dimethanonaphthalene]-6',7'-dicarboxylate