摘要:
The reaction of 4-dimethylamino-1,1,1-trifluorobut-3-en-2-one with 3-arylpyrazole-5-diazonium salt in MeCN affords 7-aryl-3-(trifluoroacetyl)pyrazolo[5,1-c][1,2,4]triazines. The transformation of relative 5-diazopyrazoles leads to 4-hydroxy- 1,4- dihydropyrazolo[5,1- c][1,2,4] triazine derivatives, while the reaction in acidic aqueous solution results in 4,4,4-trifluoro-3-oxo-2-(pyrazol-5-ylhydrazono)butanals.