Auxiliary-Directed Pd-Catalyzed γ-C(sp(3))-H Bond Activation of α-Aminobutanoic Acid Derivatives

Org Lett. 2015 Dec 18;17(24):6094-7. doi: 10.1021/acs.orglett.5b03118. Epub 2015 Dec 4.

Abstract

New bidentate auxiliaries derived from the isoxazole-3-carboxamide and oxazole-4-carboxamide moieties were used for Pd-catalyzed C(sp(3))-H bond activation. The results show that, when placed on a primary amine compound, 5-methylisoxazole-3-carboxamide (MICA) directs Pd-catalyzed activation of inert γ-C(sp(3))-H bonds for C-C bond formation. Selective and efficient arylation and alkylation of several α-aminobutanoic acid derivatives led to various γ-substituted non-natural amino acids. The MICA directing group can be conveniently removed and recovered under very mild conditions.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aminobutyrates / chemistry*
  • Catalysis
  • Isoxazoles / chemistry*
  • Molecular Structure
  • Palladium / chemistry*

Substances

  • 5-methylisoxazole-3-carboxamide
  • Aminobutyrates
  • Isoxazoles
  • Palladium