Diethyl Ether → HCID 13652718, compound

Participants

Reaction Steps

In 1 ml of acetic acid is dissolved 0.9 g of tert-butyl 3(R)-[6-(1-benzyloxycarbonyl-4-piperidyl)-1(S)-ethoxycarbonylhexyl]amino-4-oxo-2,3,4,5-tetrahydro-1,5-benzothiazepine-5-acetate, and 2 ml of 30% hydrogen bromide-acetic acid solution is added to the solution, followed by allowing the mixture to stand at room temperature for 1.5 hours. Ethyl ether (200 ml) is added to the reaction solution, which is then allowed to stand. The supenatant liquid is decanted, and the precipitate is dissolved in 30 ml of 1N aqueous sodium hydroxide solution, followed by allowing the solution to stand at room temperature for 30 minutes. The solution is neutralized by adding 3 ml of acetic acid, and purified by MCI-gel chromatography (water:methanol=1:2). The eluent is ccncentrated under reduced pressure, and the residue is lyophilized to give 0.43 g of 3(R)-[1(S)-carboxy-6-(4-piperidyl)hexyl]amino-4-oxo-2,3,4,5-tetrahydro-1,5-benzothiazepine-5-acetic acid as a colorless powder.

Provenance & Evidence