No abstract

2-Amino-5-phenyl-1,3,4-thiadiazole on reaction with ethyl-2-cyano-3,3-bis(methylthio)acrylate in the presence of N,N′-dimethyl formamide and catalytic amount of anhydrous potassium carbonate afforded 7-(methylthio)-5-oxo-2-phenyl-5H-[1,3,4]thiadiazolo[3,2-b]pyrimidine- 6-carbonitrile under similar experimental condition, compounds 7-(methylthio)-5-oxo-2-phenyl-5H-[1,3,4]thiadiazolo[3,2-b]pyrimidine-6-carbonitrile on treatment independently with aryl amines/ heteryl amines/phenols containing active methylene group yielded correspon-ding 7-substituted derivatives. All these newly synthesized compounds were screened for antimicrobial activity.

No abstract

A novel synthetic approach is formulated for the synthesis of 1,4‐dihydropyridine derivatives via one pot condensation of aromatic aldehydes, β‐keto esters, and ammonium hydroxide by using prepared STO as solid super acid heterogenous catalyst in ethanol at reflux condition. The synthesized sulfated tin oxide is confirmed by FTIR, XRD, and SEM EDX. The surface area of the catalyst is measured using BET plots. The reactions are optimized for different solvents and loading of catalyst. The yields of all 1,4‐dihydropyridine derivatives are observed in the range of 80–92%. All the synthesized DHPs are authenticated by spectral analysis. The use of environmentally benign catalyst, good atom economy, low cost and ease of work up makes this exercise efficient and sustainable.

No abstract