Physically mixed catalytic system of amino and sulfo-functional porous organic polymers as efficiently synergistic co-catalysts for one-pot cascade reactions

摘要: In this article, acid/base bi-functional polymeric materials were prepared using physically mixed porous poly(divinylbenzene-co-4-vinylbenzenesulfonic acid) (P(DVB-VBS)) with sulfonic acid groups and poly(divinylbenzene-co-4-vinylbenzyl amine) (P(DVB-VBA)) amino groups, which synthesized by solvothermal polymerization of crosslinker DVB either phenyl 4-vinylbenzenesulfonate (PVBS) or 4-vinylbenzyl amine hydrochloride (VBAH) functional monomers together subsequent hydrolyzation alkaline treatment. The utilized as a synergistic catalytic system for one-pot cascade reactions including deacetalization–Henry condensation reaction, deacetalization–Knoevenagel reaction the transformation 3,4-dihydropyran derivatives to α-ester cyclohexenone compounds. crosslinked frameworks effectively isolated primary ensure their roles both base catalyst simultaneously in system. hierarchical porosity co-catalyst provided possibility multi-step more complex substrates.