Synthesis and characterization of novel biheterocyclic compounds from 3‐alkoxy‐1H‐pyrazole‐4‐carbaldehydes via multicomponent reactions

Several series of novel biheterocyclic compounds have been synthesized starting from 3‐alkoxy‐1 H ‐pyrazole‐4‐carbaldehydes and employing different types of multicomponent reactions. The structures of the obtained 4‐(pyrazol‐4‐yl)pyrano[2,3‐ c ]pyrazole, 4‐(pyrazol‐4‐yl)pyrazolo[4′,3′:5,6]pyrano[2,3‐ b ]quinoline, 4‐(pyrazol‐4‐yl)pyridine, and 4‐[(pyrazol‐4‐yl)methylidene]‐1,2‐oxazole derivatives were thoroughly characterized and confirmed using detailed nuclear magnetic resonance spectroscopy (NMR), high‐resolution mass spectrometry (HRMS), infrared spectroscopy (IR), and X‐ray analysis.