反应详情

To a solution of ethyl 2-(6-(4-cyanopyridin-2-yloxy)-1-hydroxy-4-methyl-1,3-dihydrobenzo[c][1,2]oxaborol-3-yl)acetate (1.18 g, 3.31 mmol) in MeOH/THF (12 mL, 1:1) was added aqueous NaOH solution (250 mg in 3 mL water). After stirring at room temperature for two hours, the reaction mixture was evaporated and then acidified to pH 5 using 1 N HCl and then concentrated. HPLC purification gave desired product as a white powder. 1H NMR (400 MHz, DMSO-d6) δ 12.4 (b, 1H), 9.20 (b, 1H), 8.20 (m, 2H), 7.70 (s, 1H), 7.44 (dd, J=5.6, 1.6 Hz, 1H), 7.33 (s, 1H), 7.15 (d, J=2 Hz, 1H), 7.00 (d, J=2 Hz, 1H), 5.46 (dd, J=9.6, 2.4 Hz, 1H), 3.03 (dd, J=15.6, 2.8 Hz, 1H), 2.44 (s, 3H), 2.08 (dd, J=15.6, 9.6 Hz, 1H). MS (ESI) m/z=343 [M+H]+.

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