A green and efficient synthesis of 13 of the title compounds, three of which are novel, has been achieved via a one-pot, threecomponent reaction of anilines, aldehydes and barbituric acids, catalysed by 1,4-diaza-bicyclo[2.2.2]octane (DABCO) in water at reflux. Using microwave heating, reaction times were shortened from 12 h to under a minute and yields were generally higher.
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