1,5-Disubstituted tetrazoles are vital drug-like scaffolds usually encountered as valuable bioisosteres of the cis-amide bond. In this article, we reported the synthesis of some novel medicinally relevant pyrazole centered 1,5-disubstituted tetrazoles using ultrasound irradiation via a one-pot 4-C reaction from various pyrazole originated aldehyde, amine, isocyanide, and sodium azide. All the synthesized derivatives were characterized by IR, 1H NMR, 13C NMR, spectroscopic techniques, and mass analysis. This ultrasound-assisted green protocol has several advantages like mild reaction condition, high yield, catalyst and solvent-free reaction protocol, 15 minutes reaction time and easy workup.
A catalyst-free synthetic strategy to chromene carbonitriles by Multi-Component Reaction of pyrazole aldehydes, 5,5-dimethylcyclohexane-1,3-dione and malononitrile with ethanol, at room temperature is reported. Screening of solvents and purification of the compounds were also performed. The newly synthesized novel compound’s (4H-chromene-3-carbonitriles) structures were authenticated by the spectral techniques viz. (1H , 13C)Nuclear Magnetic Resonance, FT-IR, and LC-MS analysis.