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Benzopyrans. Part 43. Reactions of some simple condensates of 4-oxo-4H-1-benzopyran-3-carboxaldehyde with ethyl β-aminocrotonate
C K GHOSH, S K KARAK, A PATRA
Published in Wiley
2002
Volume: 34
   
Issue: 4
Pages: 311 - 313
Abstract
With ethyl β-aminocrotonate, the chromone 2A (X = H(A), Me(B), Cl(C)) gives a mixture of the dihydropyridine 4A and pyranopyridine 15A, 2B gives 4B, and 2C gives varying amounts of the substituted enamine 3C, pyridone 4C and benzophenone 8. 5-Hydroxy-5H-[1]benzopyrano-[4,3-b]pyridine 11 (< 3%) was obtained in each case. Palladised charcoal dehydrogenates dihydropyridines 4A and 4B to respectively 12A and 12B and ammonia converts 12A into the diazanaphthalene 13.
About the journal
JournalData powered by TypesetJournal of Chemical Research - Part S
PublisherData powered by TypesetWiley
ISSN0308-2342