HCID 10372347, compound → HCID 53796332, compound

Participants

Reaction Steps

In 50 ml of ethanol is dissolved 0.26 g of benzyl (S,S,S)-2-[N-[(S)-5-(1-benzyloxycarbonyl-4-piperidyl)-1-ethoxycarbonylpentyl)-L-alanyl]-2-azabicyclo[3,3,0]octane-3-carboxylate, and a catalytic reduction is carried out at ambient temperature and under atmospheric pressure using 0.2 g of 10% palladium-carbon (50% wet) as a catalyst. After the reaction is allowed to proceed for 4 hours, the catalyst is filtered off, and the filtrate is concentrated under reduced pressure to give (S,S,S)-2-[N-[(S)-5-(4-piperidyl)-1-ethoxycarbonylpentyl)-L-alanyl]-2-azabicyclo[3,3,0]octane-3-carboxylic acid as a colorless oil. This product is dissolved in 5 ml of 1N aqueous sodium hydroxide, and the solution is allowed to stand at room temperature for 1 hour, made weakly acidic with 1 ml of acetic acid and purified by XAD-2 column chromatography (0.15M aqueous ammonia-5% acetonitrile). The effluent is concentrated under reduced pressure, and the concentrate is lyophilized to give 0.15 g of (S,S,S)-2 -[N-[(S)-5-(4-piperidyl)-1-carboxypentyl]-L-alanyl]-2-azabicyclo[3,3,0]octane-3-carboxylic acid as a colorless powder.

Provenance & Evidence