Hydrochloric Acid → 5-Hydroxy-6-(1-hydroxy-1,3-dihydro-benzo[c][1,2]oxaborol-5-yloxy)-nicotinonitrile

関与物質

反応条件

反応手順

To a suspension of 6-(1-hydroxy-1,3-dihydro-benzo[c][1,2]oxaborol-5-yloxy)-5-methoxymethoxy-nicotinonitrile (0.28 g, 0.89 mmol) in methanol (4 mL) was added 1 M HCl in ether (1.79 mL, 1.79 mmol) at 0° C. The reaction was heated at 65° C. for 2 hours. Methanol was removed under reduced pressure and the product was purified by reverse phase prep HPLC using CH3CN/H2O (0.1% AcOH) as the eluent to yield the title compound (0.10 g, 41%) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ ppm 9.22 (s, 1H), 8.02 (s, 1H), 7.76 (d, J=7.8 Hz, 1H), 7.57 (s, 1H), 7.19 (s, 1H), 7.15-7.09 (m, 1H), 4.98 (s, 2H); MS (ES) m/z: 267 (M−1)−; HPLC purity 92.91% (Maxplot), 92.41% (220 nm).

情報源と証拠