1,4-Dioxane hydrochloride → HCID 57048546, compound

Participants

Reaction Steps

20 ml of a 13% hydrogen chloride-dioxane solution are added to 1.2 g of tert.-butyl (4S)-1-benzyl-3-{(2S)-2-[N-((1S)-1-benzyloxycarbonyl-3-phenylpropyl)amino]propionyl}-2-oxo-imidazolidine-4-carboxylate, and the mixture is allowed to stand at room temperature overnight. The mixture is concentrated under reduced pressure to remove solvent. Ethyl acetate and water are added to the residue and the mixture is adjusted to pH 5 to 6 with an aqueous sodium bicarbonate solution. The ethyl acetate layer is collected therefrom, washed with a saturated sodium chloride solution and dried. The resultant solution is concentrated under reduced pressure to remove solvent, whereby 1.0 g of (4S)-1-benzyl-3-{(2S)-2-[N-((1S)-1-benzyloxycarbonyl-3-phenylpropyl)amino]propionyl}-2-oxo-imidazolidine-4-carboxylic acid is obtained as colorless viscous oil. Yield: 91.9%

Provenance & Evidence