Nickel/Photoredox-Catalyzed Methylation of (Hetero)aryl Chlorides Using Trimethyl Orthoformate as a Methyl Radical Source

Stavros K. Kariofillis, Benjamin J. Shields, Makeda A. Tekle-Smith, Michael J. Zacuto, Abigail G. Doyle

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

Methylation of organohalides represents a valuable transformation, but typically requires harsh reaction conditions or reagents. We report a radical approach for the methylation of (hetero)aryl chlorides using nickel/photoredox catalysis wherein trimethyl orthoformate, a common laboratory solvent, serves as a methyl source. This method permits methylation of (hetero)aryl chlorides and acyl chlorides at an early and late stage with broad functional group compatibility. Mechanistic investigations indicate that trimethyl orthoformate serves as a source of methyl radical via β-scission from a tertiary radical generated upon chlorine-mediated hydrogen atom transfer.

Original languageEnglish (US)
Pages (from-to)7683-7689
Number of pages7
JournalJournal of the American Chemical Society
Volume142
Issue number16
DOIs
StatePublished - Apr 22 2020

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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