Hydrochloric Acid → (S)-1-(3-methyl-4-nitrophenyl)methyl-4,5,6,7-tetrahydro-1H-imidazo[4,5-c]pyridine-6-carboxylic acid methyl ester

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Reaction Steps

(S)-1-(3-methyl-4-nitrophenyl)methyl-4,5,6,7-tetrahydro-1H-imidazo[4,5-c]pyridine-6-carboxylic acid dihydrochloride (VII-2) (1.1538g, 0.00296 mol) was suspended in dry methanol (46 ml) and trimethylorthoformate (4.6 ml). Hydrogen chloride was blown into the suspension to saturation under ice cooling and stirring. The reaction solution was then stirred on a 90° C. oil bath for 6 hours, cooled, and concentrated. The resulting yellowish brown oily material (0.7456 g) was purified by silica gel column chromatography (Kiesegel 60, 60 g, chloroform/methanol= 15/1) to obtain the objective compound (VI-2) (0.7076 g; yield: 72.3%) as an orange oily material.

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