A convenient one-pot synthesis of fully substituted pyrazoles via three-component condensations of phenylhydrazine, aldehydes, and 1,3-dicarbonyl compounds using ytterbium perfluorooctanoate [Yb(PFO)3] as catalyst under solvent-free conditions is described. The reusable catalyst can be easily prepared and was efficient for the reaction. A possible mechanism is suggested.
本研究描述了在无溶剂条件下,以
全氟辛酸镱[Yb(PFO)3]为催化剂,通过苯
肼、醛和 1,3-二羰基化合物的三组分缩合反应,方便地一步合成全取代
吡唑的过程。这种可重复使用的催化剂很容易制备,并能有效地进行反应。还提出了一种可能的机理。