Ethyl 8-(benzyloxy)-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylate → Ethyl 8-hydroxy-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylate

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Reaction Steps

74 g (228 mmol) of ethyl 8-(benzyloxy)-2,6-dimethylimidazo[1,2-a]pyridine-3-carboxylate Example 16A were initially charged in 1254 ml of dichloromethane and 251 ml of ethanol, and 20.1 g 10% palladium on activated carbon (moistened with water 50%) were added under argon. The reaction mixture was hydrogenated overnight at RT and atmospheric pressure. The reaction mixture was filtered off through kieselguhr and concentrated. The crude product was purified by silica gel chromatography (dichloromethane:methanol=95:5). This gave 50.4 g (94% of theory) of the target compound.

Provenance & Evidence