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Novel photoreorganisation of 4-oxo-4H-1-benzopyrans: Synthesis of pyranobenzopyrones

✍ Scribed by N.S. Yadav; S.C. Gupta


Book ID
104227545
Publisher
Elsevier Science
Year
1987
Tongue
French
Weight
142 KB
Volume
28
Category
Article
ISSN
0040-4039

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## Abstract magnified image The title aldehyde **1** reacts smoothly with the enamine moiety of **2**‐aminochromone **2** to produce hitherto unreported 3‐(2‐hydroxybenzoyl)‐5__H__‐1‐benzopyrano[2,3‐__b__]pyridin‐5‐one (azaxanthone) **5**. This reaction has been extended for the synthesis of bisaz