Abstract
Successive treatment of potassium 1,1,3,3-tetracyano-2-(2-(methoxycarbonyl)benzoyl)prop-2-enide with concentrated sulfuric acid and water gave 2-(5′-amino-4′-cyano-3-oxo-3H,3′H-spiro[[2]benzofuran-1,2′-furan]-3′-ylidene)propanedinitrile. The reaction of the title compound with sodium hydroxide, followed by neutralization with sulfuric acid afforded 4′-amino-3,3′,6′-trioxo-2′,3′,5′,6′-tetrahydro-3H-spiro[[2]benzofuran-1,1′-pyrrolo[3,4-c]pyridine]-7′-carbonitrile.
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This study was performed under financial support by the Russian Foundation for Basic Research (project no. 18-33-20120 mol_a_ved).
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Kayukov, Y.S., Karpov, S.V., Grigorʼev, A.A. et al. Potassium 1,1,3,3-Tetracyano-2-[2-(methoxycarbonyl)benzoyl]prop-2-enide in the Synthesis of Spiro-Fused Isobenzofuran Derivatives. Russ J Org Chem 56, 1859–1861 (2020). https://doi.org/10.1134/S1070428020100322
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DOI: https://doi.org/10.1134/S1070428020100322