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.
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