4,5,6,7-tetrahydro-2,3-dimethyl-7-oxo-3H-benzoimidazole-5-carboxylic acid ethyl ester 、
ethyl [(1R)-1-amino-2,3-dihydro-1H-inden-1-yl]acetate 在
对甲苯磺酸 作用下,
以
xylene 为溶剂,
反应 96.0h,
生成 ethyl (5R,8R)-2,3-dimethyl-6-oxo-2',3,3',4,5,6,7,9-octahydrospiro[imidazo[4,5-h]quinoline-8,1'-indene]-5-carboxylate 、 ethyl (5S,8R)-2,3-dimethyl-6-oxo-2',3,3',4,5,6,7,9-octahydrospiro[imidazo[4,5-h]quinoline-8,1'-indene]-5-carboxylate