Bhumireddy Chinnachennaiahgari Venkatesh

Synthesis and antimicrobial activity of amido linked pyrrolyl and pyrazolyl-oxazoles, thiazoles and imidazoles.

A new class of amido linked bis heterocycles viz., pyrrolyl/pyrazolyl-oxazoles, thiazoles and imidazoles were prepared by 1,3-dipolar cycloaddition of TosMIC and diazomethane to the respective cinnamamide derivatives and screened for antimicrobial activity. The chlorosubstituted imidazolyl cinnamamide (6c) is the most potential antimicrobial agent as it displayed strong antibacterial activity against Bacillus subtilis and antifungal activity against Penicillium chrysogenum.

Synthesis, antimicrobial and cytotoxic activities of sulfone linked bis heterocycles.

A new class of sulfone linked bis heterocycles viz., pyrrolyl/pyrazolyl arylaminosulfonylmethyl 1,3,4-oxadiazoles, 1,3,4-thiadiazoles, and 1,2,4-triazoles were prepared and tested for antimicrobial activity and cytotoxicity. The chloro-substituted compounds 5c, 8c and 14c showed comparable antibacterial activity to chloramphenicol against Pseudomonasaeruginosa and compound 5c exhibited comparable antifungal activity to ketoconazole against Penicilliumchrysogenum. One of the compounds, vinylsulfonyl oxadiazole showed appreciably cytotoxic activity on A549 lung carcinoma cells with an IC(50) at a concentration of 31.7 μM.

One-pot Synthesis of 5-{[Bis(azolylmethylthio)]methylene}pyrimidine-2,4,6-(1H,3H,5H)-triones

A new class of hitherto unknown trisheterocycles, bisoxadiazolyl/bisthiadiazolyl pyrimidinetriones/thioxopyrimidinediones was prepared in a one‐pot reaction and their antimicrobial activity was studied.

Synthesis and antioxidant activity of pyrazolyl-oxazolines/thiazolines and isoxazolyl-oxazolines/thiazolines

A new class of pyrazolyl/isoxazolyl-oxazolines and thiazolines were synthesized from E-arylsulfonylethenesulfonylacetic acid methyl ester and tested for antioxidant activity. Among the tested compounds, 14b exhibited excellent antioxidant activity when compared with the standard ascorbic acid.

Synthesis and antioxidant activity of a new class of bis and tris heterocycles.

A series of novel heterocycles, bisbenzoxazolyl/benzothiazolyl/benzimidazolyl pyrazoles/isoxazoles/pyrimidines were synthesized and evaluated for their antioxidant activity. The bisbenzoxazolylisoxazole 10 exhibited good antioxidant activity when compared with the standard ascorbic acid.