S 98 Synthesis of new 5-aza-isosteres of guanine—5-aminosubstituted 1,2,4-triazolo[1,5-a]-1,3,5-triazin-7-ones [Electronic resource] / V. V. Bakharev, V. E. Parfenov, I. V. Ulyankina, A. V. Zavodskskaya, E. V. Selezneva, A. A. Gidaspov, O. S. Eltsov, P. A. Slepukhin // Tetrahedron. - 2014. - Vol. 70, № 38. - С. 6825-6830 Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): FUSED-RING SYSTEMS -- REARRANGEMENT -- TAUTOMERISM Аннотация: The reaction of 4-amino-substituted 6-hydrazinyl-1,3,5-triazin-2(1H)-ones with orthoformate proceeds via the Dimroth-type rearrangement to give 5-amino-substituted 1,2,4-triazolo[1,5-a]-1,3,5-triazine-7-ones. IR, NMR and X-ray studies have shown that the only product of the reaction was the [1,5-a]-isomer as prototropic 3H- and 6H-tautomers. \\\\expert2\\nbo\\Tetrahedron\\2014, v. 70 (38), p. 6825.pdf |