Abstract
Guanidinium-based sulfonic acid as a new Bronsted acid organocatalyst has been synthesized, characterized, and applied for the synthesis of 3,4-dihydroquinoxalin-2-amine, 1,6-dihydropyrazine-2,3-dicarbonitrile, triazolo[1,2-a]indazole-trione, and spiro triazolo[1,2-a]indazole-tetraone derivatives in an aqueous medium. The catalytic system, reported here, possesses the advantages of both homogeneous and heterogeneous catalysts and can be repetitively used in water.
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