反应详情

温度

110 °C

To a solution of 1-fluoro-3-nitro-5-(trifluoromethyl)benzene (500 mg, 2.391 mmol) and K2CO3 (496 mg, 3.59 mmol) in DMF (10 mL) was added 3-methyl-1H-pyrazole (196 mg, 2.391 mmol) in one portion. Then the mixture stirred under N2 was heated to 110° C. and reacted for 15 h. LCMS analysis showed the starting material disappeared. The solvent was removed in vacuo and the residue obtained was dissolved in DCM (40 mL) and washed with H2O (15 mL) and brine (15 mL). The organic layer was dried over Na2SO4, filtered and concentrated to give a residue which was purified by silica column chromatography (PE/EA=8/1 to 3/1) to afford pure product 3-methyl-1-(3-nitro-5-(trifluoromethyl)phenyl)-1H-pyrazole (300 mg, 1.007 mmol, 42.1% yield). 1H NMR (400 MHz, CD3OD): δ 8.84 (s, 1H), 8.47 (s, 1H), 8.41 (d, J=2.4 Hz, 1H), 8.35 (s, 1H), 6.42 (d, J=2.4 Hz, 1H), 2.36 (s, 3H). ES-LCMS: m/z 272.0 (M+H).

1. customreacted for 15 h
2. customThe solvent was removed in vacuo
3. customthe residue obtained
4. washwashed with H2O (15 mL) and brine (15 mL)
5. dry with materialThe organic layer was dried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated
8. customto give a residue which
9. customwas purified by silica column chromatography (PE/EA=8/1 to 3/1)