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A series of pyrido[2,3‐d]pyrimidine‐2‐thione derivatives (5a‐c) were synthesized by the one‐pot reaction of the appropriate aldehyde, malononitrile and 6‐aminothiouracil (1) in dimethyl‐formamide. The same compounds were also synthesized by the reaction of arylidine malononitrile (4) with 6‐aminothiouracil (1). Moreover, the chemical behaviour of the produced pyrimidines towards different reagents was studied.
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El-Gazzar et al. (2007) studied this question.
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