Ranjan Kumar Singh

Microwave-Assisted Green Synthesis and Antimicrobial Evaluation of Triphenyl-[1,2,4]-triazolo-[1,5-a]pyrimidine Analogues

Ranjan Kumar Singh & K P Srivastava · International Research Journal of Pure and Applied Chemistry · 2026

A rapid, environmentally friendly and efficient microwave-assisted one-pot synthesis was developed for novel 2,5,7-triphenyl-1,2,4-triazolo[1,5-a]pyrimidine derivatives using a recyclable polyphosphoric acid-silica (PPA-SiO₂) catalyst. The compounds were synthesized via a three-c...

Open access Research Article 10.9734/irjpac/2026/v27i41018

Environmentally Benign Approach to the Synthesis and Biological Evaluation of Derivatives of Pyrrolo[2,3-b]pyridine

Ranjan Kumar Singh & K. P. Srivastava · International Research Journal of Pure and Applied Chemistry · 2026

A series of novel 7-(phenacyl)-1H-pyrrolo[2,3-b]pyridinium bromide analogues was synthesised using an environmentally benign and efficient protocol. The methodology involved the direct N-alkylation of 1H-pyrrolo[2,3-b]pyridine with substituted phenacyl bromides under mild conditi...

Open access Research Article 10.9734/irjpac/2026/v27i41012