Synthesis of tetrahydro-chromeno[4,3-b]chromene-6,8-dione and tetrahydropyrano[ 4,3-b]chromene-1,9-dione derivatives catalyzed by nanosilica sulfuric acid under solvent- free conditions.

Three-component reaction between 4-hydroxycoumarin or 4-hydroxy-6-methylpyran-1-one,aromatic aldehydes and cyclic1,3-diketone catalyzed by nanosilica sulfuric acid in solvent-free conditions provided a simple and efficient one-pot route for the synthesis of tetrahydro-chromeno[4,3-b]chromene-6,8- dione and tetrahydro-pyrano[4,3-b]chromene-1,9-dione derivatives in excellent yields

کلیدواژه ها:

4-Hydroxycoumarin ، aromatic aldehydes ، nanosilica sulfuric acid ، cyclic1 ، 3-diketone ، solvent- free