| Abstract: | Enolates of α-chloro-β-oxoaldehydes react with arylhydrazines in the presence of acetic acid, forming osazones of carbonyl-substituted
glyoxals. The same osazones are obtained by the reaction of β-oxo-α-chlorenamines with arylhydrazines. Under conditions of
acid catalysis, these osazones undergo intramolecular heterocyclization to the corresponding functionalized pyrazoles.
Kazan' State Technological University. Kazan' 420015, Russia. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No.
2, pp. 190–193, February, 1998. |
