5-Amino-2-(trifluoromethyl)pyridine → 5-Hydrazinyl-2-(trifluoromethyl)pyridine

関与物質

反応手順

To a cold solution of 6-(trifluoromethyl)pyridin-3-amine (1.5 g, 9.25 mmol) in 4N HCl (60.0 mL) was added aqueous solution of NaNO2 (0.766 g, 11.11 mmol) at 0° C. The reaction mass was stirred at same temperature for 30 minutes. The reaction mass was added to a solution of SnCl2.H2O in 4N HCl at 80° C. and further continued stirring for 5-6 h at same temperature. The reaction mass was cooled, basified and extracted with DCM. The organic layer was dried and concentrated to afford 0.700 g of the product. 1H NMR (300 MHz, DMSO d6): δ 4.29 (br s, 2H), 7.1.8 (dd, J=8.6 Hz, 1H), 7.51 (d, J=8.8 Hz, 1H), 7.68 (s, 1H), 8.13 (d, J=2.4 Hz, 1H); MS (m/z): 178.15 (M+H+).

情報源と証拠