1-Cyclopropyl-3-ethoxycarbonyl-7,8-difluoro-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine → HCID 19423695, compound

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Reaction Steps

1-Cyclopropyl-8-(3-dimethylamino-1-azetidinyl)-3-ethoxycarbonyl-7-fluoro-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine was prepared under the conditions described in Example 4, but starting with 1.4 g of 1-cyclopropyl-3-ethoxycarbonyl-7,8-difluoro-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine and 1.04 g of 3-(dimethylamino)azetidine dihydrochloride. After concentration of the combined organic extracts to dryness, the solid obtained is recrystallized in 40 cm3 of ethanol. 1.2 g of 1-cyclopropyl-8-(3-dimethylamino-1-azetidinyl)-3-ethoxycarbonyl-7-fluoro-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine are obtained in the form of a yellow solid, melting point 225° C.

Provenance & Evidence