Sodium Carbonate → 7-[3-(Dimethylamino)propoxy]-3,5-dimethyl-3H-imidazo[4,5-b]pyridine-6-carboxylic acid, ethyl ester

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Reaction Steps

To a solution of 1.1 g. of 3-dimethylaminopropan-1-ol in 100 ml. of dry benzene are added 4 ml. of a 20% solution of butyl lithium in hexane. The mixture is stirred at room temperature for 15 minutes. After this time, 2.5 g. of 7-chloro-3,5-dimethyl-3H-imidazo[4,5-b]pyridine-6-carboxylic acid, ethyl ester are added and the solution is heated at reflux temperature with stirring for 12 hours. After cooling, the solution is shaken with 50 ml. of a saturated aqueous sodium carbonate solution. The benzene layer is separated, dried with calcium chloride and evaporated to dryness. The remaining oily residue, 7-[3-(dimethylamino)propoxy]-3,5 -dimethyl-3H-imidazo[4,5-b]pyridine-6-carboxylic acid, ethyl ester, is purified by distillation, yield 2.2 g. (85%); b.p. 175°-180° /0.01 mm.

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