Abstract
Oxidation of N-aminophthalimide with lead tetraacetate in the presence of 1,5-diaryl-3-[(E)-2-arylethenyl]-1H-pyrazoles, as well as of 1,3-diphenyl-5-[(E)-2-phenylethenyl]-1H-pyrazole, gives adducts at the exocyclic C=C bond, the corresponding phthalimidoaziridinylpyrazoles. From 1,5-diphenyl-3-[(1E,3E)-4-phenyl-1,3-butadienyl]-1H-pyrazole, only product of addition at both exocyclic C=C bonds was obtained. In the reaction with 1-phenyl-3-[(1E, 3E)-4-phenyl-1,3-butadienyl]-5-[(E)-2-phenylethenyl]-1H-pyrazole, the adduct at the styryl C=C bond was isolated. Analogous 4,5-dihydropyrazoles, 1,5-diphenyl-3-[(1E, 3E)-4-phenyl-1,3-butadienyl]-4,5-dihydro-1H-pyrazole and 1-phenyl-3-[(1E, 3E)-4-phenyl-1,3-butadienyl]-5-[(E)-2-phenylethenyl]-4,5-dihydro-1H-pyrazole, turned out to be inert in oxidative addition of N-aminophthalimide.
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Translated from Zhurnal Organicheskoi Khimii, Vol. 41, No. 12, 2005, pp. 1830–1837.
Original Russian Text Copyright © 2005 by Ignatenko, Blandov, Kuznetsov.
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Ignatenko, O.A., Blandov, A.N. & Kuznetsov, M.A. Oxidative Addition of N-Aminophthalimide to Alkenyl-4,5-dihydropyrazoles and Alkenylpyrazoles. Synthesis of Aziridinylpyrazoles. Russ J Org Chem 41, 1793–1801 (2005). https://doi.org/10.1007/s11178-006-0039-3
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DOI: https://doi.org/10.1007/s11178-006-0039-3