Acetic Acid → alpha-D-Glucopyranosyl bromide, tetraacetate

Participants

Reaction Steps

To β-D-glucose pentaacetate (5 g, 12.81 mmol) was added 33% HBr in acetic acid (30 mL, 192 mmol) at rt. After stirring for 40 min, the mixture was diluted with CH2Cl2 (150 mL) and washed with ice cold water until the washings were neutral pH. The organic layer was dried over MgSO4, filtered and concentrated to give the title compound. 1H NMR (CDCl3) δ 2.06 (s, 3H), 2.08 (s, 3H), 2.12 (s, 3H), 2.13 (s, 3H), 4.15 (d, J=11.1, 1H), 4.31-4.37 (m, 2H), 4.86 (dd, J=9.9, 4.0, 1H), 5.19 (t, J=9.8, 1H), 5.58 (t, J=9.8, 1H), 6.63 (d, J=4.0, 1H).

Provenance & Evidence