Synthesis of pyranopyrazole and pyranopyrimidine derivatives using magnesium oxide nanoparticles and evaluation as corrosion inhibitors for lubricants

A three-component, one pot reaction was used to synthesize different pyranopyrazole, tetrahydrochromene, and pyranopyrimidine derivatives using magnesium oxide nanoparticles with a faster reaction time, higher yield, and higher purity than a conventional piperidine base catalyst. The prepared compounds were identified by FT-IR, 1HNMR, 13CNMR spectroscopy, and evaluated as good copper corrosion inhibitors by blending with a base stock lubricant provided by the Iraqi Midland Refineries Company/AlDaura according to ASTM–D130.