Condensation of aromatic aldehydes with ethoxycarbonylacetohydrazide and cyanoacetohydrazide
作者:C. N. O'Callaghan
DOI:10.1039/j39710000207
日期:——
Hydrazones (1a and b) formed from aromaticaldehydes by condensation with ethoxycarbonylacetohydrazide and cyanoacetohydrazide, respectively, undergo Knoevenagel condensations to yield either mono-(2) or di-adducts (3). With salicylaldehyde, however, only coumarin derivatives are produced.
salicylaldehyde azine (3) was reported in 1985 as the single product of the reaction of ethyl 2-oxo-2H-chromene-3-carboxylate (1) with hydrazine hydrate, we identified another main reaction product, besides 3, which was identified as malono-hydrazide (4). In the last two decades, however, some articles have claimed that this reaction afforded exclusively hydrazide 2 and they have reported the use of this
Synthesis of 1-Substituted 3-Alkyl-1,2,3-triazol-3-ium-5-olates
作者:Yu. I. Nein、A. Yu. Polyakova、Yu. Yu. Morzherin、E. A. Savel’eva、Yu. A. Rozin、V. A. Bakulev
DOI:10.1023/b:rujo.0000044553.95915.78
日期:2004.6
Alkylation of 1-substituted sodium 1,2,3-triazol-5-olates with halogen derivatives occurs at the nitrogen atom in position 3 of the heteroring to give zwitterionic 1,2,3-triazol-3-ium-5-olates.