5-Alkoxycarbonyl-substituted 1H-pyrrole-2,3-diones react with phenylurea, forming alkyl 4-hydroxy-5-oxo-2-[(phenylcarbamoyl)amino]-2,5-dihydro-1H-pyrrole-2-carboxylates, which cyclize in the presence of sodium methoxide, giving 8-hydroxy-3-phenyl-1,3,6-triazaspiro[4.4]-non-8-ene-2,4,7-triones. The crystal structures of 8-hydroxy-9-(4-methylbenzoyl)-3-phenyl-6-(p-tolyl)-1,3,6-triazaspiro[4.4]non-8-ene-2,4,7-trione and methyl 8-hydroxy-2,4,7-trioxo-3,6-diphenyl-1,3,6-triazaspiro[4.4]non-8-ene-9-carboxylate were studied.
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This work received financial support from the Ministry of Education and Science of the Russian Federation (project No. 965) and Russian Foundation for Basic Research (project 16-03-590613).
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, 2016, 52(7), 467–472
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Dubovtsev, A.Y., Denislamova, E.S., Silaichev, P.S. et al. Synthesis of Imidazole Spiro Compounds From 5-Alkoxycarbonyl-1H-Pyrrole-2,3-Diones and Phenylurea. Chem Heterocycl Comp 52, 467–472 (2016). https://doi.org/10.1007/s10593-016-1913-8
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DOI: https://doi.org/10.1007/s10593-016-1913-8