Ethyl orthoformate → 7-chloro-3,5-dimethyl-3H-imidazo[4,5-b]pyridine-6-carboxylic acid ethyl ester

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Reaction Steps

2.4 g. of 5-Amino-6-methylamino-4-chloro-2-methylpyridine-3-carboxylic acid ethyl ester (0.01 mol.) and 10 ml. of orthoformic acid triethyl ester are refluxed for 12 hours. After the excess ortho ester has been removed, the residue is recrystallized from ethyl acetate to obtain 7-chloro-3,5-dimethyl-3H-imidazo[4,5-b]pyridine-6-carboxylic acid ethyl ester, m.p. 56°-58°. Yield 2.2 g. (88%).

Provenance & Evidence