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DOI: 10.1055/sos-SD-015-00002

Spitzner, D.Science of Synthesis, (20051587.

3-Azapenta-1,3-dienes [(vinylimino)alkanes] 323 condense with aldehydes or aldimines 324 to give the intermediate alk-2-enal N-vinylimines[‌376‌] which undergo an electrocyclic reaction to form isomeric dihydropyridines. These are dehydrogenated in situ to provide pyridines 325 or 326 (Scheme 106).[‌377‌]

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