Condensation of aromatic aldehydes with ethoxycarbonylacetohydrazide and cyanoacetohydrazide

Author:
  • COC. N. O'CAllaghan
    C. N. O'CAllaghan
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Abstract
Hydrazones (1a and b) formed from aromatic aldehydes 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.