Heterocycles p. 755 - 763 (2011)
Update date:2022-08-02
Topics:
Filimonov, Sergey I.
Chirkova, Zhanna V.
Abramov, Igor G.
Firgang, Sergey I.
Stashina, Galina A.
Suponitsky, Kyrill Yu.
New method has been elaborated for synthesis of novel substituted 4- hydroxy-3-oxo-3,4-dihydro-2H-1,4-benzoxazine-6,7-dicarbonitriles by means of activated nucleophilic substitution of the bromine atom in 4-bromo-5- nitrophthalonitrile by treatment of the latter with sodium salts of substituted 3- cyano-2-hydroxy-3-phenyl acrylates followed by reductive cyclisation. The structure of the resulting substituted 4-hydroxy-3-oxo-3,4-dihydro-2H-1,4- benzoxazine-6,7-dicarbonitriles has been determined by single crystal X-ray diffraction analysis.
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