Hydrochloric Acid → 8-(4-Benzyloxy-phenyl)-3-methyl-7-oxo-3,7-dihydro-imidazo[4,5-a]quinolizine-10-carboxylic acid

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Reaction Steps

2.44 g (5.5 mmol) of methyl 8-(4-benzyloxy-phenyl)-3-methyl-7-oxo-3,7-dihydro-imidazo[4,5-a]quinolizine-10-carboxylate in 50 ml of ethanol were treated with a solution of 1.4 g (21 mmol) of potassium hydroxide (content 86%) in 50 ml of water. After boiling under reflux for 4 hours 200 ml of water were added and the mixture was adjusted to pH 1-2 with 2N hydrochloric acid while cooling with ice. The precipitate obtained was filtered off, washed with water and dried. There were obtained 2.16 g (92%) of 8-(4-benzyloxy-phenyl)-3-methyl-7-oxo-3,7-dihydro-imidazo[4,5-a]quinolizine-10-carboxylic acid as yellow crystals with m.p. 227-229° C.

Provenance & Evidence