A Simple Synthesis of Stable 1,4-Diionic Pyridinium Betaines |
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Authors: | Issa Yavari Mohammad Anary-Abbasinejad Abdolali Alizadeh |
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Affiliation: | (1) Department of Chemistry, Mazandaran University, 47415 Babolsar, Iran |
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Abstract: | Protonation of the reactive intermediate produced in the reaction between pyridine and dialkyl acetylenedicarboxylates by strong CH-acids such as N,N′-dimethylbarbituric acid, Meldrum’s acid, or indane-1,3-dione leads to a vinylpyridinium cation which undergoes an addition reaction with the enolate anion of the CH-acid to produce stable 1,4-diionic pyridinium betaines in good yields. |
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