A highly selective tandem cross-coupling of gem-dihaloolefins for a modular, efficient synthesis of highly functionalized indoles

J Org Chem. 2008 Jan 18;73(2):538-49. doi: 10.1021/jo701987r. Epub 2007 Dec 22.

Abstract

A highly efficient method of indole synthesis using gem-dihalovinylaniline substrates and an organoboron reagent was developed via a Pd-catalyzed tandem intramolecular amination and an intermolecular Suzuki coupling. Aryl, alkenyl, and alkyl boron reagents are all successfully employed, making for a versatile modular approach. The reaction tolerates a variety of substitution patterns on the aniline leading to indoles with group at C2-C7. The orthogonal approach of the sequential copper- and palladium-mediated synthesis of 1,2-diarylindoles exploited the wide availability of diverse organoboron reagents.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alkenes / chemistry*
  • Aniline Compounds / chemistry*
  • Boron Compounds / chemistry
  • Catalysis
  • Indoles / chemical synthesis*
  • Indoles / chemistry
  • Molecular Structure
  • Nitrobenzenes / chemistry
  • Palladium / chemistry
  • Stereoisomerism

Substances

  • Alkenes
  • Aniline Compounds
  • Boron Compounds
  • Indoles
  • Nitrobenzenes
  • gem-dihalovinylaniline
  • Palladium