反应详情

温度

80 °C

N′-Ethanimidoylacetohydrazide (147 mg, 1.28 mmol) and sodium bicarbonate (99%, 181 mg, 2.13 mmol) were added to a solution of 2-bromo-1-[1-methyl-5-(4-methylphenyl)-1H-pyrazol-4-yl]ethanone (250 mg, 0.853 mmol) in acetonitrile (9 mL), and the mixture was heated at 80° C. for 3 hours. The reaction was allowed to cool to room temperature, and was then diluted with dichloromethane and filtered through Celite. The filtrate was concentrated in vacuo, and the residue was purified by silica gel chromatography (Eluant: 10% methanol in dichloromethane) to provide the product as a yellow oil. Yield: 236 mg, 0.763 mmol, 89%. LCMS m/z 310.5 (M+1). 1H NMR (400 MHz, CDCl3), presumed to be a mixture of rotamers: δ 2.10 and 1.77 (2 s, 3H), 2.25 and 2.36 (2 s, 3H), 2.44 and 2.46 (2 s, 3H), 3.69 and 3.72 (2 s, 3H), 6.21 (s, 1H), 7.22-7.33 (4H, m, assumed; partially obscured by solvent peak), 7.96 (br s, 1H).

1. temperatureto cool to room temperature
2. filtrationfiltered through Celite
3. concentrationThe filtrate was concentrated in vacuo
4. customthe residue was purified by silica gel chromatography (Eluant: 10% methanol in dichloromethane)