Transformation of 3-amino-8-hydroxy-1,6-dioxo-2,7-diazaspiro[4.4]non-3-en-4-carbonitriles in concentrated hydrohalic acid media leads to the obtaining of two classes of fused heterocycles: 4-halogen-3-hydroxy-1,3-dihydrofuro[3,4-c]pyridin-1-ones and octahydropyrrolo[3,4-c]pyrrole-1,3,4,6-tetraones.
![Graphical abstract: The rare transformation of 2,7-diazaspiro[4.4]nonanes in furo[3,4-c]pyridines](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=C5RA27585G&imageInfo.ImageIdentifier.Year=2016)
S. V. Fedoseev, O. V. Ershov, K. V. Lipin and M. Yu. Belikov, RSC Adv., 2016, 6, 10597 DOI: 10.1039/C5RA27585G
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