Ultrasonics Promoted Synthesis of 5-(Pyrazol-4-yl)-4,5-Dihydropyrazoles Derivatives

Applied Sciences

Jorge Trilleras²  Efraín Polo²  Jairo Quiroga¹  Justo Cobo³ 

[1] Research Group of Heterocyclic Compounds, Department of Chemistry, University of Valle, A. A 25360 Cali, Colombia; E-Mail:;Research Group of Heterocyclic Compounds, Chemistry Program, Faculty of Basic Sciences, The University of Atlantico, Km 7 Antigua vía Puerto Colombia, Barranquilla-Atlántico, Colombia; E-Mails:;Department of Inorganic and Organic Chemistry, University of Jaén, 23071 Jaén, Spain; E-Mail:

关键词: pyrazolines;    cyclocondensation;    sonication;    chalcones;    hydrazines;   

DOI  :  10.3390/app3020457

来源: mdpi

【 摘 要 】

A series of new 1,3-diaryl-5-(1-phenyl-3-methyl-5-chloropyrazol-4-yl)-4,5-dihydropyrazole derivatives have been synthesized under sonication conditions in ethanol or methanol/glacial acetic acid mixture (5/1 ratio) with two equivalents of hydrazines and seven kinds of chalcone-like heteroanalogues obtained from 5-chloro-3-methyl-1-phenyl-1H-pyrazole-4-carbaldehyde. The structures were established on the basis of NMR, IR, MS and element analysis. This method provides several advantages over current reaction methodologies, including a simple work-up procedure, shorter reaction times (2–20 min) and good yields (65%–80%).

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.