Thiazolidin-4-One Formation. Mechanistic And Synthetic Aspects Of The Reaction Of Imines And Mercaptoacetic Acid Under Microwave And Conventional Heating
ORGANIC & BIOMOLECULAR CHEMISTRY(2004)
Abstract
Microwave irradiation of a mixture of benzylidene-anilines and mercaptoacetic acid in benzene gives 1,3-thiazolidin-4-ones in very high yield ( 65 - 90%), whereas the same reaction performed through using the conventional method, at reflux temperature, requires a much longer time and gives a much lower yield ( 25 - 69%). This difference seems to be due to some intermediates and by-products formed during the conventional reaction. On the basis of H-1 NMR studies, two different mechanisms, acting in benzene and in DMF, respectively, have been hypothesized for the thiazolidin-4-one system formation.
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Key words
condensation reactions
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