A facile synthesis and molecular structure determination of a novel class of 1,3,4-oxadiazoles.

• Synthesis and characterization of new class of 2,5-disubstituted 1,3,4-oxadiazoles. • The structural determination was investigated through single crystal X-ray diffraction analysis. • The intercontacts of the crystal structure was studied through Hirshfeld surface analysis. • The structure and reactivity of the oxadiazole compounds have been analysed through DFT calculation. • Compounds displayed strong binding affinity with targeted COX-2 enzyme has been recognized via molecular docking study. A new class of hitherto unexplored 1, 3, 4-oxadiazoles, OXA2a and OXA2b has been synthesized in excellent yields and characterized by IR, NMR and mass spectroscopic studies. Further, the compounds have also been identified clearly with the aid of single crystal X-ray diffraction analysis. In the crystal structure, there is a short intramolecular C H•••O contact forming S(5) ring motif in OXA2a and OXA2b. The crystal packing of OXA2a is stabilized by the C H•••π intermolecular interactions and in the crystal packing of OXA2b , the adjacent molecules are linked via C H•••N intermolecular hydrogen bonds. The intercontacts in the crystal structure are investigated through computational method using Hirshfeld surfaces. In addition, the structure and reactivity of the oxadiazole compounds have been analysed through DFT calculations. Further, both the compounds displayed strong binding affinity with targeted COX-2 enzyme which has been recognized via molecular docking study. [ABSTRACT FROM AUTHOR]