反应详情

To a solution of 5-chloro-4-(2-fluoro-4-nitrophenoxy)pyrrolo[2,1-f][1,2,4]triazine (2.00 g, 6.48 mmol) in THF (50 mL)/MeOH (80 mL) was added zinc dust (2.12 g, 32.4 mmol) followed by ammonium chloride (1.73 g, 32.4 mmol). After stirring at rt for 8 h, the reaction mixture was filtered through Celite® with MeOH and then concentrated in vacuo. The residue was taken up in ethyl acetate (200 mL) and washed with water (2×100 mL) then brine (1×100 mL). The organic phase was dried over anhydrous Na2SO4 and concentrated in vacuo. The crude product was purified by flash chromatography on silica gel (50 % EtOAc/hexanes) to give the title compound (1.51 g, 84%) as a pale yellow solid. 1H NMR (CDCl3) δ 7.95 (s, 1H), 7.69 (d, 1H, J=2.8 Hz), 7.09 (t, 1H, J=8.4 Hz), 6.79 (d, 1H, J=2.8 Hz), 6.58 (dd, 1H, J=11.6, 2.6 Hz), 6.51 (d, 1H, J=8.7 Hz), 3.92 (br s, 2H); MS(ESI+) m/z 279.2 (M+H)+.

1. filtrationthe reaction mixture was filtered through Celite® with MeOH
2. concentrationconcentrated in vacuo
3. washwashed with water (2×100 mL)
4. dry with materialThe organic phase was dried over anhydrous Na2SO4
5. concentrationconcentrated in vacuo
6. customThe crude product was purified by flash chromatography on silica gel (50 % EtOAc/hexanes)