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A pyridine catalyzed reaction between tetracyanoethylene and various activated CH-acid compounds to afford the corresponding pyran annulated heterocyclic ring systems in high yield at room temperature within a few minutes, is described. The work-up procedure is very simple and the products do not require further purification.
Reaction of the zwitterions generated from pyridine or pyridine derivatives and dialkyl acetylenedicarboxylate with electron-deficient tetracyanoethylene lead to highly substituted quinolizines without using any catalyst or activation.
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