Potassium Carbonate → HCID 13389002, compound

Participants

Reaction Steps

6.9 g (19.4 mmol) of 1,4,5,6-tetrahydro-2-methyl-4-(3-nitrophenyl)-5-oxo-1,6-naphthyridine-3-carboxylic acid ethyl ester prepared according to Example 1, and 2.4 g (19.4 mmol) of N,N-dimethylaminopropylchloride are kept at boiling temperature for 48 hours with 10.7 g (77.6 mmol) potassium carbonate in 500 ml acetone. The product is reduced in volume to dryness under vacuum, the residue is taken up in 500 ml water and 500 ml methylene chloride and the organic phase washed with 500 ml water and dried over sodium sulfate. The brown crude product obtained after removing the solvent in vacuo is recrystallized twice from acetonitrile/ethanol. There is obtained 1,4,5,6-tetrahydro-6-(3-dimethylaminopropyl)-2-methyl-4-(3-nitrophenyl)-5-oxo-1,6-naphthyridine-3-carboxylic acid ethyl ester in the form of yellow needles with a melting point of 212°-213° C.

Provenance & Evidence