A new and straightforward method for the synthesis of 5-arylidine barbituric and thiobarbituric acids through a reaction between barbituric acid and its thio-analogue with aldehydes using [DABCO](SO3H)2(HSO4)2) as an efficient catalyst has been reported.
Arylidine barbituric and thiobarbituric acids are prepared by reaction of barbituric acid and its thio‐analogue with various aldehydes under green reaction conditions.
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