S 98 Synthesis of mesoionic[1,2,3]triazolo[5,1-delta][1,2,5]triazepines [Text] / E. A. Savel'eva, Yu. A. Rozin, M. I. Kodess, L. V. Meervelt, W. Dehaen, Yu. Yu. Morzherin, V. A. Bakulev // Tetrahedron. - 2004. - Vol. 60, № 25. - P5367-5372 : ил. - Библиогр.: с. 5371-5372 (9 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): TRIAZOLIUM -- SYNTHESIS -- CARBONYL GROUP Аннотация: Intramolecular cyclization of 1-amino-3-phenacyl-4-carbohydrazido-1,2,3-triazolium-5-olates has been shown to take place via selective interaction of the carbonyl group with the terminal amino function of the hydrazido group to form a 1,2,5-triazepine ring. Minor products, resulting from the interaction of the ?-nitrogen atom of the hydrazido group with the carbonyl function, having a N-amino-pyridazine structure were also detected and isolated. A general method for the synthesis of novel mesoionic 2-amino-7-aryl-4-oxo-2,4,5,8-tetrahydro[1,2,3]triazolo[5,1-d][1,2,5]triazepin-9-ium-3-olates was developed. \\\\Expert2\\nbo\\Tetrahedron\\2004, v.60, p.5367.pdf |