Abstract
Herein, we report the sulfonamide-functionalized covalent organic framework (COF-SO3H) prepared from melamine and terephthalaldehyde and subsequent sulfonation, as an acidic porous catalyst for the one-pot preparation of polyhydroquinoline and 1,4-dihydropyridine derivatives. COF-SO3H was characterized by FT-IR, EDX, TGA, SEM, XRD, and BET. This methodology offers several advantages including high yield, short reaction time, simple workup procedure, solvent-free conditions, ease of separation, and recyclability. One-pot preparation of polyhydroquinoline and 1, 4-dihydropyridine derivatives
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