A convenient and direct approach has been developed for the preparation of pyrazole derivatives by the condensation cyclization of hydrazines/hydrazide and 1,3‐diketones in the presence of Cu1.5PMo12O40 (0.33 mol%) under mild conditions (r.t.‐60 °C, 10–30 min). Notably, the reaction was found to be scalable as 99% yield was obtained when the reaction was performed at a 5‐mmol scale. This solvent‐free
在温和的条件下(rt-60),在Cu 1.5 PMo 12 O 40(0.33 mol%)存在下,通过
肼/酰
肼和1,3-二酮的缩合环化反应,已经开发了一种方便直接的方法来制备
吡唑衍
生物。°C,10–30分钟)。值得注意的是,当反应在5 mmol规模下进行时,发现该反应可扩展,产率为99%。这种无溶剂和无卤素的催化体系代表了
吡唑的一种有效的经济和环保方法。