Migrative Carbofluorination of Saturated Amides Enabled by Pd-Based Dyotropic Rearrangement

J Am Chem Soc. 2022 Aug 10;144(31):14047-14052. doi: 10.1021/jacs.2c06578. Epub 2022 Aug 2.

Abstract

Directly editing an all-carbon quaternary carbon itself of nonstrained acyclic molecules remains underexploited despite the recent advances in the fields of both C-H and C-C bond activation. Herein, we report a palladium-catalyzed migrative carbofluorination of saturated amides enabled by the activation of both the C(sp3)-H and the Cquaternary-Cσ bonds. In this transformation, the α-quaternary carbon of Weinreb amides is converted to α-tertiary fluoride with concurrent migration of an aryl or an amido group from the α- to β-carbon. DFT calculations indicate that the dyotropic rearrangement proceeds through an unusual anti-selective [2.1.0] bicyclic transition state. The reaction, compatible with a broad range of functional groups, is stereospecific and is applicable to the synthesis of enantioenriched products.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amides* / chemistry
  • Carbon / chemistry
  • Catalysis
  • Molecular Structure
  • Palladium* / chemistry

Substances

  • Amides
  • Palladium
  • Carbon