Butylamine → 4-Butylamino-6-chloro-2-methyl-5-nitronicotinic acid ethyl ester

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Reaction Steps

139.5 g. of 4,6-dichloro-2-methyl-5-nitropyridine-3-carboxylic acid ethyl ester (0.5 Mol.) are dissolved in about 500 ml. of methanol. 60 g. of triethylamine are added and the solution is heated at reflux temperature. At this point, 36.5 g. of n-butylamine are added dropwise. The solvent is then removed in vacuo and 500 ml. of benzene are added to the residue. The triethylamine hydrochloride is filtered off and the solvent evaporated. The resulting oil is dissolved in 300 ml. of methanol and yields on cooling 110 g. of 4-butylamino-6-chloro-2-methyl-2-nitropyridine-3-carboxylic acid, ethyl ester (70%), m.p. 33°-35° (methanol).

Provenance & Evidence