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Double Anion Capture Reactions of Anthranilic Esters with Oxaldiimidoyl Dichlorides − Efficient Synthesis of 2,2′-Biquinazoline-4,4′(3H,3′H)-diones

✍ Scribed by Peter Langer; Jörg Wuckelt; Manfred Döring; Helmar Görls

Publisher
John Wiley and Sons
Year
2001
Tongue
English
Weight
401 KB
Volume
2001
Category
Article
ISSN
1434-193X

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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

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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.