Methyl chloroformate → 3-ethyl-7-methoxy-1-propyl-1H-pyrimido[5,4-c]quinoline-2,4-dione

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4-Chloro-8-methoxy-quinoline-3-carboxylic acid ethyl ester (250 mg, 0.94 mmol) was treated with 1-aminopropane following general procedure B to afford 8-methoxy-4-propylamino-quinoline-3-carboxylic acid ethyl ester (260 mg). Thus obtained amino-ester was hydrolyzed to the corresponding acid in quantitative yield using general procedure D and then transformed into 8-methoxy-4-propylamino-quinoline-3-carboxylic acid ethylamide (200 mg) following general procedure E. The above ethylamide (0.70 mmol) was subjected to reaction with methyl chloroformate according to general procedure F to furnish 3-ethyl-7-methoxy-1-propyl-1H-pyrimido[5,4-c]quinoline-2,4-dione (26 mg). LCMS: m/z 314 [M+1]+.

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