N-Methylcyclohexylamine → 8-[(Cyclohexyl)(methyl)amino]-7-fluoro-1-methyl-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine-3-carboxylic acid

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Reaction Steps

8-[(Cyclohexyl)(methyl)amino]-7-fluoro-1-methyl-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine-3-carboxylic acid was prepared under the conditions of Example 1, but from 1.5 g of 7,8-difluoro-1-methyl-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine-3-carboxylic acid and 1.3 cm3 of N-methylcyclohexylamine in 30 cm3 of dimethyl sulphoxide. After washing 2 times with with 15 cm3 of ethanol, 1.7 g of 8-[(cyclohexyl)(methyl)amino]-7-fluoro-1-methyl-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine-3-carboxylic acid were obtained in the form of a yellow solid melting at about 265° C.

Provenance & Evidence