Diethylamine → (4-Diethylaminomethyl-1,6-dihydroxy-1,3-dihydro-benzo[c][1,2]oxaborol-3-yl)-acetic acid

Participants

Reaction Steps

To a mixture of (4-Bromomethyl-1,6-dihydroxy-1,3-dihydro-benzo[c][1,2]oxaborol-3-yl)-acetic acid ethyl ester (0.5 mmol) in DCM (5 mL) was added diethylamine (5 mmol) and the mixture was stirred overnight at r.t. The crude product was evaporated, LiOH (75 mg) in THF/water/methanol (2:1:1, 5 mL) was added and stirred at r.t. for 1 h. The solvent was evaporated to give a residue, which was purified by HPLC, yielded 5 mg of desire product. MS (ESI) m/z: 294 [M+1]+; 1H NMR (300 MHz, CD3OD) δ 7.18 (s, 2H), 5.72-5.76 (dd, 1H), 4.20-4.45 (dd, 2H), 3.05-3.22 (m, 3H), 2.36-2.44 (dd, 1H), 1.40-1.45 (t, 3H), 1.30-1.34 (t, 3H).

Provenance & Evidence