1,4-Dioxane hydrochloride → HCID 68909883, compound

Participants

Reaction Steps

A 3.0 ml ethanol solution of 105 mg of ethyl 1-{[(3R,4S)-3-({(tert-butoxycarbonyl)[(1R)-1-(1-naphthyl)ethyl]amino}methyl)-4-phenylpyrrolidin-1-yl]carbonyl}piperidine-4-carboxylate was mixed at room temperature with 1.0 ml of 1 M sodium hydroxide aqueous solution and stirred overnight at room temperature. The reaction solution was concentrated under a reduced pressure, acidified by adding 1 M hydrochloric acid and then extracted with chloroform and dried with anhydrous sodium sulfate. The solvent was evaporated under a reduced pressure, and the thus obtained residue was purified by a silica gel column chromatography to obtain 86 mg of 1-{[(3R,4S)-3-({(tert-butoxycarbonyl)[(1R)-1-(1-naphthyl)ethyl]amino}methyl)-4-phenylpyrrolidin-1-yl]carbonyl}piperidine-4-carboxylic acid as a white amorphous substance. A 2.0 ml 1,4-dioxane solution of 86 mg of 1-{[(3R,4S)-3-({(tert-butoxycarbonyl)[(1R)-1-(1-naphthyl)ethyl]amino}methyl)-4-phenylpyrrolidin-1-yl]carbonyl}piperidine-4-carboxylic acid was mixed at room temperature with 1.0 ml of 4 M hydrogen chloride/1,4-dioxane and stirred overnight at room temperature. The reaction solution was concentrated and crystallized with 1,4-dioxane-diisopropyl ether to obtain 80 mg of 1-{[(3S,4S)-3-({[(1R)-1-(1-naphthyl)ethyl]amino}methyl)-4-phenylpyrrolidin-1-yl]carbonyl}piperidine-4-carboxylic acid hydrochloride as a white solid.

Provenance & Evidence