反应详情

4,7-Dichloro-8-methoxy-quinoline-3-carboxylic acid ethyl ester (250 mg, 0.84 mmol) was treated with butylamine following general procedure B to afford 7-chloro-4-butylamino-8-methoxy-quinoline-3-carboxylic acid ethyl ester (210 mg). Thus obtained amino-ester was hydrolyzed to the corresponding acid using general procedure D and then transformed into the corresponding ethylamide (125 mg) following general procedure E. The above ethylamide (0.37 mmol) was subjected to reaction with methyl chloroformate according to general procedure F to furnish 8-chloro-3-ethyl-1-butyl-7-methoxy-1H-pyrimido[5,4-c]quinoline-2,4-dione (75 mg). LCMS: m/z 380 [M+1]+.