Abstract

Silica boron sulfonic acid [SiO2–B(OSO3H)3] as an inexpensive, reusable, and Lewis and Bronsted acid catalyst was successfully synthesized, and used for the one-pot three-components synthesis of biologically active substituted Hantzsch 1,4-dihydropyridine derivatives in the absence of solvent at 90oC. Silica boron sulfonic acid is attractive and efficient, because it plays in two role as a Lewis acid (by boron atom) and also as a Bronsted acid (by OSO3H group), which can have a better effect in reaction. The reaction was carried out under solvent-free and mild conditions. Silica boron sulfonic acid can be recovered and reused for at least five consecutive runs.

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