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The pure cis‐ and trans‐isomers of ethyl N‐(2‐pyridinyl)aminomethylenecyanoacetates were obtained and their structure and their interconvertibility is diseussed. 4H‐Pyrido[1,2‐a]pyrimidin‐4‐one‐3‐carboxylic acids were synthesized by treatment of both cis‐ and trans‐isomers with hydrochloric acid.
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Nishigaki et al. (1971) studied this question.
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