ethyl 1-allyl-2-methyl-4-oxo-4,5,6,7-tetrahydro-1H-benzimidazole-6-carboxylate 、
Ethyl 2-Amino-2,3-dihydro-1H-inden-2-ylacetate 在
对甲苯磺酸 作用下,
以
xylene 为溶剂,
反应 96.0h,
以21%的产率得到ethyl 3-allyl-2-methyl-6-oxo-1',3,3',4,5,6,7,9-octahydrospiro[imidazo[4,5-h]quinoline-8,2'-indene]-5-carboxylate