One‐Pot Synthesis of Polyhydroquinoline Derivatives through Organic‐Solid‐Acid‐Catalyzed Hantzsch Condensation Reaction

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We report the synthesis of a new porous polymeric network (PPN) using triphenylamine and α,α‐dibromo‐ p ‐xylene by a Friedel–Crafts alkylation promoted by anhydrous FeCl 3 as an oxidizing agent. Sulfonation of PPN led to a sulfonated porous polymeric network (SPPN) having high surface acidity and high BET surface area. We characterized the PPN and SPPN materials thoroughly by using powder XRD, FTIR spectroscopy, 13 C solid‐state magic‐angle spinning NMR, field‐emission SEM, high‐resolution TEM, and N 2 sorption techniques. The sulfonated material SPPN was then employed as a heterogeneous, reusable, and environmentally benign organic solid‐acid catalyst for the one‐pot synthesis of biologically important polyhydroquinoline derivatives under microwave irradiation.