Reduction of different electron-poor N-heteroarylhydrazines in strong basic conditions

Chemistry. 2007;13(6):1754-62. doi: 10.1002/chem.200600282.

Abstract

The first application of the Wolff-Kishner reduction methodology to electron-poor heteroaromatic compounds is reported. Hydrazino-containing heterocycles with hydrazone-type tautomery have been reduced under basic conditions. This novel chemistry was successfully applied to mono-dehalogenate a number of electron-poor heterocycles in a regioselective manner. According to the experimental results, this reductive process is a base-catalyzed reaction that takes only place in the presence of air, probably through an oxygen-assisted mechanism. As consequence of the specific features of this kind of hydrazone/enehydrazine tautomers, the overall outcome of the process is the synthesis of a Shapiro-type reduction product by simply using a milder version of the Huang-Minlon methodology.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Electrons*
  • Heterocyclic Compounds / chemistry*
  • Hydrazines / chemistry*
  • Hydrazones / chemistry*
  • Hydrogen-Ion Concentration
  • Models, Chemical
  • Oxidation-Reduction
  • Oxygen / chemistry

Substances

  • Heterocyclic Compounds
  • Hydrazines
  • Hydrazones
  • Oxygen