Methanol → Methyl 3-(2-chloro-4-hydroxybenzyl)-2,7-dimethylimidazo[4,5-b]pyridine-5-carboxylate

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Reaction Steps

A mixture of methyl 3-(4-acetoxy-2-chlorobenzyl)-2,7-dimethyl-3H-imidazo[4,5-b]pyridine-5-carboxylate (6.5 g), conc. sulfuric acid (3.0 ml) and methanol (60 ml) was refluxed under heating for 1.5 hr. The reaction mixture was diluted with chloroform (60 ml) and saturated aqueous sodium hydrogen carbonate solution was gradually added under ice-cooling. The organic layer was separated, dried over magnesium sulfate and concentrated to dryness under reduced pressure. The residue was washed with diethyl ether to give methyl 3-(2-chloro-4-hydroxybenzyl)-2,7-dimethyl-3H-imidazo[4,5-b]pyridine-5-carboxylate (3.81 g) as a pale-yellow powder.

Provenance & Evidence