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KMID : 1059520110550040662
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Journal of the Korean Chemical Society
2011 Volume.55 No. 4 p.662 ~ p.665
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Silica Gel Promoted Mild, Efficient and Inexpensive Protocol for the Preparation of 3,4-dihydropyrano[c]chromenes
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T. S. R. Prasanna
K. Mohana Raju
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Abstract
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Highly efficient, three-component condensation of aromatic aldehyde, malononitrile and 4-hydroxycoumarin promoted by neat silica gel at room temperature is described. The method offers an excellent alternative to the synthesis of 3,4-dihydropyrano[c]chromenes. The reactions are fast and clean, and the products are obtained with good yield and purity.
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KEYWORD
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Silica gel, one pot three-component condensation, aromatic aldehyde, malononitrile, 4-hydroxycoumarin.
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