Environmentally Benign Room-Temperature Synthesis of Quinoxalines using Silica-Supported PPA as a Recyclable Catalyst

Abstract

We have reported highly proficient, environmental benign, SiO2@PPA catalyzed protocol for the synthesis of 2, 3-diphenyl quinoxalines via condensation of ophenylene diamine with α-diketones. Surface modified silica with polyphosphuric acid offered outstanding catalytic efficiency at room temperature and it sustained up to fifth cycle. The methodology boasts a hassle-free catalyst preparation process, operates under energy-conserving conditions, yields a commendable (93-84%) output of the targeted moieties and exhibits catalyst recyclability. These appealing features position it as a superior and eco-friendly alternative to traditional methods for synthesizing quinoxalines.