3,4-二氨基甲苯 、
3-(4-氯苯基)戊二酸酐 以a 1:1-mixture of the regioisomers 7-methyl-3-phenyl-3,4-dihydropyrido[1,2-a]benzimidazol-1(2H)-one and 8-methyl-3-phenyl-3,4-dihydropyrido[1,2-a]benzimidazol-1(2H)-one was obtained的产率得到7-methyl-3-phenyl-3,4-dihydropyrido[1,2-a]benzimidazol-1(2H)-one