反应详情

The crude ethyl 2-(1-hydroxy-6-(5-(N-hydroxycarbamimidoyl)-1,3,4-thiadiazol-2-yloxy)-4-methyl-1,3-dihydrobenzo[c][1,2]oxaborol-3-yl)acetate was dissolved in a mixture of THF and MeOH (1:1, 5 ml) and then treated with aqueous LiOH solution (200 mg in 5 mL water). After stirring at room temperature for one hour, the reaction mixture was evaporated, acidified with 1N HCl to pH 3 and then concentrated. HPLC purification gave desired product as white solid. 1H NMR (400 MHz, DMSO-d6) δ 12.4 (b, 1H), 10.3 (b, 1H), 9.20 (b, 1H), 7.41 (d, J=2Hz, 1H), 7.28 (d, J=1.6 Hz, 1H), 5.48 (dd, J=9.2, 2 Hz, 1H), 4.07 (b, 2H), 3.00 (dd, J=15.6, 2.4 Hz, 1H), 2.27 (s, 3H), 2.10 (dd, J=15.6, 9.2 Hz, 1H). MS (ESI) m/z=363 [M−H]+.

1. customthe reaction mixture was evaporated
2. concentrationconcentrated
3. customHPLC purification