Synthesis of N-alkoxy amines and hydroxylamines via the iridium-catalyzed transfer hydrogenation of oximes

Org Biomol Chem. 2022 Aug 17;20(32):6394-6399. doi: 10.1039/d2ob01084d.

Abstract

Cationic iridium (Ir) complexes were found to catalyze the transfer hydrogenation of oximes to access N-alkoxy amines and hydroxylamines, and the reaction was accelerated by trifluoroacetic acid. The practical application of this protocol was demonstrated by a gram-scale transformation and two-step synthesis of the fungicide furmecyclox (BAS 389F) in overall yields of 92 and 85%, respectively. An asymmetric protocol using chiral Ir complexes to afford chiral N-alkoxy amines was demonstrated, but the low yields/ee obtained indicated that further development was required.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alcohols
  • Amines*
  • Catalysis
  • Hydrogenation
  • Hydroxylamines
  • Iridium*
  • Oximes
  • Stereoisomerism

Substances

  • Alcohols
  • Amines
  • Hydroxylamines
  • Oximes
  • alkoxyl radical
  • Iridium