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Novel pyrano[4,3-b]pyran-5-one derivatives have been obtained efficiently in a multicomponent domino cyclisation via the one-pot three-component reaction of aromatic aldehyde, 4-hydroxy-6methyl-2-pyrone and N-methyl-1-(methylthio)-2-nitroethenamine in ethanol under microwave irradiation. The combined methods show excellent advantages such as higher yield, shorter reaction time and cleaner reaction, compared with conventional heating methods. The synthesized compounds are confirmed by 1H NMR, 13C NMR, IR and ESI-MS.

Convenient multicomponent reaction synthesis of novel pyrano[4,3-b]pyran derivatives via a domino reaction under microwave irradiation