Direct Assembly of Diverse Unsymmetrical Tertiary 9-Fluorenols via Transient Directing Group-Enabled Palladium-Catalyzed Dual C-H Bond Activation of α-Ketoesters

J Org Chem. 2022 Aug 19;87(16):10807-10814. doi: 10.1021/acs.joc.2c01080. Epub 2022 Aug 3.

Abstract

An expeditious construction of an unsymmetrical tertiary 9-fluorenol skeleton was accomplished starting from readily available α-ketoester and aryl iodide. Inexpensive commercially available substituted aniline was utilized as a potent monodentate transient directing group (TDG) to assist palladium-catalyzed direct ortho-C-H arylation and tandem dual C-H activation of α-ketoesters to form two carbon-carbon bonds. To demonstrate practical applications, the reaction was enlarged to the gram scale, and subsequent one-step derivatization allowed facile access to structurally diversified useful derivatives. A series of control experiments were carried out to shed light on the possible catalytic mechanism.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

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

Substances

  • Palladium
  • Carbon