Abstract
Reactions of 1,3-dialkyl-2-thioxo-1,2,3,3a,9,9a-hexahydroimidazo[4,5-e]thiazolo[3,2-b]-1,2,4-triazin-7(6H)-ones with isatin and its derivatives under base catalysis conditions lead to the corresponding 1,3-dialkyl-6(7)-(2-oxoindolin-3-ylidene)derivatives of 2-thioxo-1,2,3,3a,9,9a-hexahydroimidazo[4,5-e]thiazolo[3,2-b]-1,2,4-triazin-7(6H)-one or 2-thioxo-1,2,3,3a,4,9a-hexahydroimidazo[4,5-e]thiazolo[2,3-c]-1,2,4-triazin-8(7H)-one resulting from the aldol-crotonic condensation and skeletal amidine rearrangement of the thiazolotriazine fragment, depending on the amount of added alkali.
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Original Russian Text © A.N. Izmest’ev, G.A. Gazieva, A.S. Kulikov, L.V. Anikina, N.G. Kolotyrkina, A.N. Kravchenko, 2017, published in Zhurnal Organicheskoi Khimii, 2017, Vol. 53, No. 5, pp. 741–750.
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Izmest’ev, A.N., Gazieva, G.A., Kulikov, A.S. et al. Synthesis and biological activity of oxindolylidene derivatives of imidazo[4,5-e]thiazolo[3,2-b]-1,2,4-triazin-7-ones and imidazo[4,5-e]thiazolo[2,3-с]-1,2,4-triazin-8-ones. Russ J Org Chem 53, 753–763 (2017). https://doi.org/10.1134/S1070428017050177
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DOI: https://doi.org/10.1134/S1070428017050177