Regioselective Alkylative Cross-Coupling of Remote Unactivated C(sp3)-H Bonds

J Am Chem Soc. 2019 Sep 11;141(36):14062-14067. doi: 10.1021/jacs.9b07014. Epub 2019 Sep 3.

Abstract

The functionalization of unactivated C(sp3)-H bonds poses a significant challenge due to their ubiquity and relative similarity in most organic frameworks. Herein, we describe the use of a combined photoredox and nickel catalytic system for the regioselective C(sp3)-C(sp3) coupling of unactivated C(sp3)-H bonds and alkyl bromides. Positional selectivity is dictated by a 1,5-hydrogen atom transfer (HAT) reaction by a pendent amide. Interception of this radical by a Ni catalyst allows distal alkylation to occur in good yield and excellent selectivity.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Alkylation
  • Catalysis
  • Hydrocarbons, Brominated / chemical synthesis*
  • Hydrocarbons, Brominated / chemistry
  • Molecular Structure
  • Nickel / chemistry
  • Oxidation-Reduction
  • Photochemical Processes
  • Stereoisomerism

Substances

  • Hydrocarbons, Brominated
  • Nickel