Synthesis of α,γ-Chiral Trifluoromethylated Amines through the Stereospecific Isomerization of α-Chiral Allylic Amines

Org Lett. 2022 Jun 3;24(21):3867-3871. doi: 10.1021/acs.orglett.2c01436. Epub 2022 May 19.

Abstract

Chiral γ-branched aliphatic amines are present in a large number of pharmaceuticals and natural products. However, enantioselective methods to access these compounds are scarce and mainly rely on the use of designed chiral transition-metal complexes. Herein, we combined an organocatalytic method for the stereospecific isomerization of chiral allylic amines with a diastereoselective reduction of the chiral imine/enamine intermediates, leading to γ-trifluoromethylated aliphatic amines with two noncontiguous stereogenic centers, in excellent yields and high diastereo- and enantioselectivities. This approach has been used with primary amine substrates. This approach also provides a new synthetic pathway to chiral trifluoromethylated scaffolds, of importance in medicinal chemistry. Additionally, a gram-scale reaction demonstrates the applicability of this synthetic procedure.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amines* / chemistry
  • Catalysis
  • Imines* / chemistry
  • Isomerism
  • Stereoisomerism

Substances

  • Amines
  • Imines