反应详情

A mixture of 2,6-dihydroxybenzaldehyde (438 mg, 11.47 mmol, 2 eq.) and K2CO3 (2.4 g, 17.22 mmol, 3 eq.) in DMF (150 mL) was stirred at rt for 10 min. To this mixture was added 3-(chloromethyl)-2-(1-(2,2,2-trifluoroethyl)-1H-pyrazol-5-yl)pyridine hydrochloride (498 mg, 1.59 mmol, 1 eq.) at rt. The mixture was heated at 50° C. for 2 h, filtered, concentrated and purified on silica gel using a mixture of EtOAc and hexanes as eluent to 2-hydroxy-6-((2-(1-(2,2,2-trifluoroethyl)-1H-pyrazol-5-yl)pyridin-3-yl)methoxy)benzaldehyde (338.4 mg, 56%) as a pale yellow solid. 1H NMR (400 MHz, CDCl3) δ 11.99 (s, 1H), 10.41 (s, 1H), 8.76 (dd, J=4.7, 1.6 Hz, 1H), 8.01 (dd, J=7.9, 1.4 Hz, 1H), 7.69 (d, J=1.9 Hz, 1H), 7.49-7.39 (m, 2H), 6.61 (d, J=8.5 Hz, 1H), 6.53 (d, J=1.9 Hz, 1H), 6.32 (d, J=8.3 Hz, 1H), 5.30 (q, J=8.6 Hz, 2H), 5.17 (s, 2H). LRMS (M+H+) m/z 378.1

1. temperatureThe mixture was heated at 50° C. for 2 h
2. filtrationfiltered
3. concentrationconcentrated
4. custompurified on silica gel using
5. additiona mixture of EtOAc and hexanes as eluent to 2-hydroxy-6-((2-(1-(2,2,2-trifluoroethyl)-1H-pyrazol-5-yl)pyridin-3-yl)methoxy)benzaldehyde (338.4 mg, 56%) as a pale yellow solid