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A reinvestigation of the reactions of 3-substituted chromones with hydroxylamine. Unexpected synthesis of 3-amino-4H-chromeno[3,4-d]isoxazol-4-one and 3-(diaminomethylene)chroman-2,4-dione

✍ Scribed by Vyacheslav Ya. Sosnovskikh; Vladimir S. Moshkin; Mikhail I. Kodess

Publisher: Elsevier Science
Year: 2008
Tongue: French
Weight: 177 KB
Volume: 49
Category: Article
ISSN: 0040-4039
DOI: 10.1016/j.tetlet.2008.09.091

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✦ Synopsis

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## Abstract The __Michael__‐type addition of a 4‐hydroxycoumarin (=4‐hydroxy‐2__H__‐1‐benzopyran‐2‐one) **1** to a __β__‐nitrostyrene (=(2‐nitroethenyl)benzene) **2** in the presence of AcONH~4~ leads to substituted (3__E__)‐3‐[amino(aryl)methylidene]chroman‐2,4‐diones (=(3__E__)‐3‐[amino(aryl)meth

ChemInform Abstract: Efficient Synthesis

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## Abstract Michael‐type addition of hydroxycoumarins (I) towards β‐nitrostyrenes (II) in the presence of ammonium acetate provides access to title amino(aryl)methylenechromanediones (III) in high yields.

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