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Synthesis of 1,2,3,4-tetrahydro-5H-[1]benzopyrano[3,4-c]pyridin-5-ones. I. 3-unsubstituted compounds

✍ Scribed by David T. Connor; Paul C. Unangst; Charles F. Schwender; Roderick J. Sorenson; Mary E. Carethers; Chester Puchalski; Richard E. Brown

Book ID: 112127646
Publisher: Journal of Heterocyclic Chemistry
Year: 1984
Tongue: English
Weight: 213 KB
Volume: 21
Category: Article
ISSN: 0022-152X
DOI: 10.1002/jhet.5570210563

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## Abstract The title compounds 5a‐c and 7a‐m have been prepared by Vilsmeier formylation of 4‐aminocoumarins 1 yielding aldehydes 2, and subsequent condensation of 2 with C‐H acids in the presence of piperidine. This condensation probably proceeds via the intermediate ylidenemalonic esters 4. By m