反应详情

温度

120 °C

A mixture of 5-phenyl-1H-pyrazol-3-ylamine (501 mg, 3.15 mmol) and 3-oxobutanoic acid ethyl ester (0.433 mL, 3.39 mmol) in anhydrous toluene (2.9 mL) is heated at 120° C. in a sealed vial. After 2 hr, the reaction is cooled to room temperature. The precipitate is collected in a Buchner funnel and washed with hexanes to afford 5-methyl-2-phenylpyrazolo[1,5-a]pyrimidin-7(4H)-one (577 mg, yield 81%). LCMS: (AA) M+1 226; 1H NMR (400 MHz, DMSO) δ 12.35 (s, 1H), 8.01-7.92 (m, 2H), 7.49-7.43 (m, 2H), 7.42-7.37 (m, 1H), 6.57 (s, 1H), 5.60 (s, 1H), 2.29 (s, 3H).

1. temperaturethe reaction is cooled to room temperature
2. customThe precipitate is collected in a Buchner funnel
3. washwashed with hexanes