In this research, a new strategy for synthesis of benzimidazoles via condensing o‐phenylenediamine and substituted aldehydes by adopting prepared sulfated tin oxide as solid heterogenous catalyst in water ethanol system (1:1‐v/v) at reflux condition has been developed. The solid sulfated tin oxide is synthesized and confirmed by XRD, EDS map, SEM images, and FTIR. The reaction is optimized for different solvents and loading of catalyst. The yields of all benzimidazole derivatives are observed in the range of 80–94%. All the synthesized benzimidazoles are analyzed by spectral data. The use of ecologically benign catalyst sulfated tin oxide, solvent system, ample substrate scope with good atom economy, environmental affordability, and easy work up makes this protocol green.

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.

A novel synthetic scheme has been designed for the synthesis of polyhydroquinoline derivatives via one-pot condensation of aromatic aldehydes, EAA, dimedone, and NH4OAc by employing synthesized STO as a heterogeneous solid acid catalyst in ethanol under reflux condition. FTIR, XRD, and SEM EDX were used to confirm the sulfated tin oxide. BET plots were used to analyze the surface area of the catalyst. The reactions were assessed for diverse solvents and catalyst loading. The yields of all the polyhydroquinoline derivatives were found to range between 80 to 92%. All the synthesized polyhydroquinolines were validated by spectral data. This exercise is efficient and green as it uses an environmentally friendly catalyst, has a significant atom economy, is cost-effective and easy to work up.

In this research, a novel strategy for synthesis of quinazolinones has been formulated via one pot condensation of aromatic aldehydes, isatoic anhydride, and aniline by employing prepared povidone‐phosphotungstic acid (PVP‐PWA) hybrid as a novel solid acid heterogenous catalyst in methanol at 80 °C. The synthesized PVP‐PWA is confirmed by FTIR, XRD and studied for TGA, BET plots. The reaction is optimized for different solvents and loading of catalyst. The yields of all quinazolinone derivatives are observed in the range of 78–86%. All the synthesized quinazolinones are investigated by spectral data. The use of ecologically benign catalyst, good atom economy, environmental affordability, and easy work up makes this protocol sustainable.