反应详情

To a solution of 3-methyl-1-(3-nitro-5-(trifluoromethyl)phenyl)-1H-pyrazole (300 mg, 1.106 mmol) in MeOH (10 mL) was added Pd/C (11.77 mg, 0.111 mmol) in one portion. Then the mixture was stirred under H2 for 12 h. LCMS analysis showed the starting material disappeared. The suspension was filtered through a pad of Celite® and the filter cake was washed with MeOH (2 mL). The combined filtrates were concentrated to dryness to give crude product which was purified by preparative TLC (PE/EA=5/1, Rf=0.35) to afford pure product 3-(3-methyl-1H-pyrazol-1-yl)-5-(trifluoromethyl)aniline (300 mg, 1.045 mmol, 94% yield). 1H NMR (400 MHz, CD3OD): δ 8.05 (d, J=2.4 Hz, 1H), 7.18-7.12 (m, 2H), 6.82 (s, 1H), 6.30 (d, J=2.2 Hz, 1H), 2.32 (s, 3H). ES-LCMS: m/z 242.1 (M+H).

1. filtrationThe suspension was filtered through a pad of Celite®
2. washthe filter cake was washed with MeOH (2 mL)
3. concentrationThe combined filtrates were concentrated to dryness
4. customto give crude product which
5. customwas purified by preparative TLC (PE/EA=5/1, Rf=0.35)