反应详情

温度

55 °C

To a solution of 4-bromo-1-isopropyl-5-(2-methoxy-5-nitro-phenyl)-1H-pyrazole (0.50 g, 1.47 mmol) in ethanol (5.0 mL), was added SnCl2.2H2O (1.3 g, 5.88 mmol) and the mixture was heated at 55° C. overnight. The ethanol was evaporated and the residue was taken up in ethyl acetate (50 mL) and washed with 10% NaOH (10 mL). The organic layer was dried over MgSO4 and evaporated to yield a light yellow solid. The crude material was purified via Biotage silica chromatography (hexane/EtOAc, 3/1) to yield a pale yellow solid of 3-(4-bromo-2-isopropyl-2H-pyrazol-3-yl)-4-methoxy-phenylamine (0.38 g, 85%). LCMS m/z (%)=311 M+H+, (79Br, 100), (81Br, 96.5), 1H NMR (400 MHz, CDCl3) δ: 7.47 (s, 1H), 6.78 (d, J=8.08 Hz, 1H), 6.72 (dd, J1=8.01 Hz, J2=2.78 Hz, 1H), 6.54 (d, J=2.78 Hz, 1H), 4.14 (m, 1H), 3.63 (s, 3H), 1.4 (d, J=6.57 Hz, 3H), 1.23 (d, J=6.57 Hz, 3H).

1. customThe ethanol was evaporated
2. washwashed with 10% NaOH (10 mL)
3. dry with materialThe organic layer was dried over MgSO4
4. customevaporated
5. customto yield a light yellow solid
6. customThe crude material was purified via Biotage silica chromatography (hexane/EtOAc, 3/1)