Hydrogen Bromide → HCID 67404620, compound

Participants

Reaction Steps

1,2,4,6-Tetra-O-acetyl-3-deoxy-3-(3,5-dimethoxybenzamido)-D-galactopyranose 4 (50 mg, 0.098 mmol) was dissolved in dichloromethane (1 ml) which had been dried over 4 Å molecular sieves. Acetic anhydride (18 μl, 0.20 mmol) and HBr (0.2 ml, 33% in AcOH) were added, and the mixture was stirred under N2 at room temperature. After 2 h 30 min, the reaction mixture was diluted with dichloromethane (30 ml) and poured into ice-water (30 ml). The organic phase was washed with NaHCO3 (30 ml of a saturated aqueous solution), dried (MgSO4), filtered and concentrated in vacuo to give 2,4,6-tri-O-acetyl-3-deoxy-3-(3,5-dimethoxybenzamido)-α-D-galactopyranosyl bromide 9, which was used without further purification.

Provenance & Evidence