Hydrogen Bromide → HCID 178462028, compound

Participants

Reaction Steps

A solution of (2R,3S)-2-[[(2S)-2-benzyloxycarbonylamino-3-[N-[bis(4-methoxyphenyl)methyl]carbamoyl]propionyl]amino]-3-[[(1S)-1-carboxy-2-(4-imidazolyl)ethyl]amino]butyric acid (635 mg) and 30% hydrogen bromide in acetic acid (5 ml) was stirred for 2 hours at room temperature and the mixture was poured into a mixture of ice-water (20 ml) and ethyl acetate (20 ml). The aqueous phase was separated and subjected to a column of Dowex 50W x 8 (H+, 20 ml). The column was washed with water and the elution was carried out with 2.8% aqueous ammonia. The object fractions were collected and evaporated in vacuo. The residue was dissolved in water (50 ml) and lyophilized to give (2R,3S)-2-[[(2S)-2-amino-3-carbamoylpropionyl]amino]-3-[[(1S)-1-carboxy-2-(4-imidazolyl)ethyl]amino]butyric acid (190 mg) as a white powder.

Provenance & Evidence