Pd(II)-catalyzed annulation of terminal alkynes with 2-pyridinyl-substituted p-quinone methides: direct access to indolizines

Chem Commun (Camb). 2022 Nov 29;58(95):13238-13241. doi: 10.1039/d2cc04395e.

Abstract

A Pd-catalyzed direct method has been developed to access 1,3-disubstituted indolizines. This reaction proceeds through a regiospecific annulation of terminal alkynes with 2-pyridinyl-substituted p-quinone methides and, in most of the cases, the desired 1,3-disubstituted indolizines were obtained in moderate to good isolated yields. The control experiments suggested that the reaction does proceed through a substrate-controlled regiospecific formal [3 + 2]-annulation pathway.

MeSH terms

  • Alkynes*
  • Catalysis
  • Indolizines*
  • Molecular Structure
  • Quinones

Substances

  • Alkynes
  • Indolizines
  • quinone methide
  • Quinones