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Catalytic Synthesis of Ethyl ß-arylamino Crotonates and 2-methyl-4-quinolone using Preyssler Heteropolyacid, H14[NaP5W30O110] and its supported as Catalysts
Published: 23 November 2008 by MDPI in The 12th International Electronic Conference on Synthetic Organic Chemistry session General Organic Synthesis
Abstract: A variety of aromatic anilines react with methyl acetoacetate in the presence of catalytic amount of Preyssler’s and molybdenum substituted Preyssler heteropolyacid, H14[NaP5W30O110], H14[NaP5W29MoO110] and silica supported Preyssler, H14[NaP5W30O110]/SiO2, to afford the corresponding ethyl ß-arylamino crotonates, in excellent yields. The catalyst can be recovered and reused. Synthesis of 4-quinolones from the cyclization of ethyl ß-arylamino crotonates in the presence of diphenyl ether under reflux conditions is reported.
Keywords: ethyl ß-arylamino crotonates, 4-quinolone, Preyssler, heteropolyacid, catalyst