Review Article

Ultrasound-Assisted Synthesis of Pyrazole–1,3,4-Oxadiazole Hybrids: Synthetic Advances, Antimicrobial Activity, and Structure–Activity Relationships

Abstract

Pyrazole–1,3,4-oxadiazole hybrids are the combination of two privileged heterocyclic pharmacophores with potential antimicrobial significance and the ultrasound-assisted synthesis is a potentially efficient method for the construction of heterocycle. This is a critical review of the evidence linking these two research directions. The physicochemical aspects of acoustic cavitation and the reported sonochemical effects on azole synthesis are first considered, and then direct and adjacent evidence for systems of pyrazole–1,3,4 oxadiazole is compared. The antimicrobial activity against Gram-positive and Gram-negative bacteria, mycobacteria and fungi is evaluated, with particular attention to the comparability of assays and structure–activity relationships. A significant gap in the literature exists in terms of conducting simultaneous studies in the design of pyrazole–1,3,4-oxadiazole hybrid compounds, their synthesis using ultrasound and their evaluation of antimicrobial activity: relatively small number of studies meet this criteria while several good biological activities are found using conventional or microwave-assisted synthesis. Therefore, sonochemistry is not yet considered as a proven source of biological benefits for this chemotype. Also, the data is limited by heterogeneous susceptibility methods, incompleteness of the acoustic parameters, incomplete mechanistic validation and lack of cytotoxicity, resistance and in vivo data. Standardized antimicrobial assays, complete sonochemical parameterization, thermal and microwave control and integrated selectivity and mechanism studies are recommended. 

Authors affiliation:

Islam H.Tarrad: Medical Laboratory Techniques Department, Health and Medical Technique College, University of Hilla , Babylon, Iraq.
Marwah K.S. Alluhaibi: Department of Pharmacy, Alamal College for Specialized Medical Sciences, Karbala, Iraq.

How To Cite: I.H. Tarrad and M.K.S. Alluhaibi. Ultrasound-Assisted Synthesis of Pyrazole–1,3,4-Oxadiazole Hybrids: Synthetic Advances, Antimicrobial Activity, and Structure–Activity Relationships. Journal of Applied Health Sciences and Medicine, 6(10):35–44, 2026. https://doi.org/10.58614/jahsm6105