ethyl 4-[(3-aminoquinolin-4-yl)amino]butanoate 、
原丁酸三甲酯 在
silica gel 作用下,
以to provide ethyl 4-(2-propyl-1H-imidazo[4,5-c]quinolin-1-yl)butyrate (14.2 g) as a solid after chromatography on silica gel (elution with 5% methanol in dichloromethane)的产率得到ethyl 4-(2-propyl-1H-imidazo[4,5-c]quinolin-1-yl)butanoate