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An organocatalytic rearrangement of 2-(N-alkyl-/aryl-)amino-4-oxo-4H-1-benzopyran-3-carbaldehyde

✍ Scribed by Sourav Maiti; Suman Kalyan Panja; Chandrakanta Bandyopadhyay


Publisher
Elsevier Science
Year
2011
Tongue
French
Weight
194 KB
Volume
52
Category
Article
ISSN
0040-4039

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Reactions of 2-amino-4h-1-benzopyran-4-o
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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

A one-pot synthesis of the 1-benzopyrano
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## Abstract magnified image 2‐(Alkyl/arylamino)chromone‐3‐carbaldehyde reacts with Meldrum's acid, hippuric acid, 4‐hydroxycoumarin, diethyl malonate, ethyl acetoacetate, or ethyl benzoylacetate to produce 1‐benzopyrano[2,3‐__b__]pyridine‐2,5‐dione moiety, but ethyl cyanoacetate and malononitrile r