Abstract
Domino reactions of 3-methylpyrazol-5-amine with aromatic or heterocyclic aldehydes, cyclopentanone, cyclopentane-1,3-dione or indane-1,3-dione in DMF or in alcoholic medium proceed regioselectively and lead to the formation of partially hydrogenated 4-aryl(hetaryl)-substituted cyclopenta[d]-pyrazolo[3,4-b]pyridine, cyclopenta[b]pyrazolo[4,3-e]pyridin-5(2H)-one or indeno[1,2-b]pyrazolo[4,3-e]pyridin-5(2H)-one systems respectively. The structure of 3-methyl-4-phenyl-2,5,6,7-tetrahydrocyclopenta[b]pyrazolo[ 4,3-e]pyridine and 3-methyl-4-(4-fluorophenyl)-4,6,7,8-tetrahydro-cyclopenta[b]pyrazolo[4,3-e]pyridin-5(2H)-one was confirmed by X-ray diffraction (XRD).
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Original Russian Text © V.V. Lipson, V.V. Borodina, N.I. Zemlyanaya, M.G. Shirobokova, V.I. Musatov, S.V. Shishkina, D.S. Sofronov, 2015, published in Zhurnal Organicheskoi Khimii, 2015, Vol. 51, No. 5, pp. 714–721.
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Lipson, V.V., Borodina, V.V., Zemlyanaya, N.I. et al. Domino reactions of 3-methyl-5-aminopyrazole with aryl(hetaryl)aldehydes, cyclopentanone, cyclopentan-1,3-dione, and 1,3-indanedione. Russ J Org Chem 51, 697–704 (2015). https://doi.org/10.1134/S1070428015050206
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DOI: https://doi.org/10.1134/S1070428015050206