Two-Step Synthesis of 2-Trifluoromethylated and 2-Difluoromethylated Benzoheteroles Starting from HFO-1224yd(Z) and HFO-1233yd(Z)

Org Lett. 2022 Dec 23;24(50):9306-9310. doi: 10.1021/acs.orglett.2c03930. Epub 2022 Dec 12.

Abstract

An efficient two-step method for synthesizing 2-(trifluoromethyl)- and 2-(difluoromethyl)benzoheteroles bearing various substituents was developed. Commercially available HFO-1224yd(Z) or HFO-1233yd(Z) underwent the Suzuki-Miyaura coupling with arylboronic acids (acid esters) bearing a nucleophilic moiety at the ortho position to yield the corresponding β-fluoro-β-(trifluoromethyl)- or β-fluoro-β-(difluoromethyl)styrenes, respectively. Treatment of the obtained styrenes with potassium phosphate induced nucleophilic 5-endo-trig cyclization to provide the corresponding 2-trifluoromethylated or 2-difluoromethylated indoles and benzofurans, as well as benzothiophenes.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Benzofurans*
  • Cyclization
  • Indoles
  • Molecular Structure
  • Styrenes

Substances

  • Benzofurans
  • Indoles
  • Styrenes