The synthesis of derivatives of the Noria macrocycle
and the structurally
similar macrocycle, R3, each containing 12 sulfonic acid groups, is
reported. Herein, we demonstrate their utility as reusable Brønsted
acid catalysts for the Biginelli synthesis of dihydropyrimidinones
and the Pechmann synthesis of coumarins. We also demonstrate that
the supramolecular structure directs the reagents to interact with
the sulfonic acid catalytic sites, thus increasing the catalyst’s
efficiency compared to other monomeric, macrocyclic, and polymeric
sulfonic acid catalysts.
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