Abstract
A versatile method for the synthesis of 2′-amino-1,2-dihydrospiro[(3H)-indole-3,4′-(4′H)-pyran]-2-ones has been suggested consisting in the three-component reaction of isatins, cyanoacetic acid derivatives, and α-methylenecarbonyl compounds (β-dicarbonyl compounds, activated phenols, and OH-substituted heterocycles) in ethanol in the presence of triethylamine as a catalyst. The reaction proceeds selectively to form spiro[(3H)-indole-3,4′-(4′H)-pyrans].
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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2326–2332, November, 2008.
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Mortikov, V.Y., Litvinov, Y.M., Shestopalov, A.A. et al. Versatile three-component synthesis of 2′-amino-1,2-dihydrospiro[(3H)-indole-3,4′-(4′H)-pyran]-2-ones. Russ Chem Bull 57, 2373–2380 (2008). https://doi.org/10.1007/s11172-008-0338-7
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DOI: https://doi.org/10.1007/s11172-008-0338-7