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Silica Supported V2O5 as a Catalyst Promoted the Synthesis of 4h-Pyrans Through Multicomponent Reaction Under Solvent Free Conditions

Eslam A. Mostafa and Tamer K. Khatab

Silica supported V2O5 was synthesized and elucidated by X-ray diffraction; using scanning electron microscopy and Fourier transform infrared spectroscopy. From the data obtained crystalline phase of V2O5 overlapped over the silicate amorphous matrix. V2O5/SiO2 has been used as an efficient and eco-friendly catalyst in the synthesis of 4H-pyran derivatives. A series of 2-amino-3cyano-4H-pyran derivatives was synthesized through one-pot reaction of ethylacetoacetate (EAA), malononitrile and aldehydes. In the presence of catalytic amount of V2O5/SiO2 the reactions occurred under stirring at 80°C temperature in solventless conditions. Keywords