反应详情

n-Butyl lithium (1.65 mL, 0.00265 mol, 1.6 M) was added to a solution of 3-bromo-4-(trifluoromethyl)pyridine (E; 0.5 g, 0.022 mol) in anhydrous tetrahydrofuran (15 mL), at −78° C. The reaction mixture was stirred for 10 min followed by the addition of dimethylformamide (0.2 mL, 0.00265). It was stirred for 30 min at same temperature. The reaction mixture was quenched with a saturated aqueous ammonium chloride solution (25 mL) and the aqueous layer was extracted with ethyl acetate (2×50 mL). The organic extracts were combined and then washed with a saturated aqueous sodium chloride solution (1×50 mL), dried over sodium sulphate and concentrated to afford 4-(trifluoromethyl)nicotinaldehyde. 1H NMR (400 MHz, DMSO-d6) δ 10.39 (s, 1H), 9.25 (s, 1H), 9.10-9.09 (d, J=4 Hz, 1H), 7.95-7.94 (d, J=4 Hz, 1H).

1. stirringIt was stirred for 30 min at same temperature
2. customThe reaction mixture was quenched with a saturated aqueous ammonium chloride solution (25 mL)
3. extractionthe aqueous layer was extracted with ethyl acetate (2×50 mL)
4. washwashed with a saturated aqueous sodium chloride solution (1×50 mL)
5. dry with materialdried over sodium sulphate
6. concentrationconcentrated