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Synthetic Communications
An International Journal for Rapid Communication of Synthetic Organic Chemistry
Volume 27, 1997 - Issue 15
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Original Articles

Transformation of 5-Oxo Substituted Fused Pyran-2-ones. Lactam Versus Hydrazone Formation

, , , , , , , & show all
Pages 2637-2644 | Received 17 Jan 1997, Published online: 22 Aug 2006
 

Abstract

6, 7-Dihydrocyclopenta[b]pyran-2, 5-dione 1 was converted with hydrazines to fused pyridine-2(1H)-ones of type a. In contrast, 2H-1-benzopyran-2, 5-diones 2–4 gave under the same reaction conditions 5-hydrazonobenzopyrans of type b. Calculated heats of formation matched experimental findings.

Notes

Ellis, G. P., In ref. 1a, Vol. 3, pp. 647–736.

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