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Reactions of Pyrazole-3(5)-diazonium Salts with 4-Hydroxy-2H-chromen-2-one and Isochroman-1,3-dione. -(LEDENYOVA*, I. V.; GRACHEVA, A. A.; SHIKHALIEV, K. S.; Chem. Heterocycl. Compd. (N. Y., NY, U. S.) 51 (2015) 8, 734-737, http://dx.doi.org/10.1007/s10593-015-1766-6 ; Voronezh State Univ., Voronezh 394006, Russia; Eng.) -A. Forchert 13-181

Derivatives of a previously unknown heterocyclic system 6Н-chromeno[4,3-e]pyrazolo[5,1-c][1,2,4]triazin-6-one were obtained via reaction of pyrazole-3(5)-diazonium salts with 4-hydroxy-2Н-chromen-2-one. Analogous reactions with isochroman-1,3-dione are followed by recyclization leading to the formation of 2-(4-hydroxypyrazolo[5,1-c][1,2,4]triazin-3-yl)benzoic acids.

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