A New Strategy for the Synthesis of 4-Propargyl-Substituted 1H-Pyrroles from N-(5-phenyl-2,4-pentadiynyl) beta-Enaminones


Yılmaz E. S. , Zora M.

CHEMISTRYSELECT, vol.4, pp.11043-11047, 2019 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 4
  • Publication Date: 2019
  • Doi Number: 10.1002/slct.201902759
  • Title of Journal : CHEMISTRYSELECT
  • Page Numbers: pp.11043-11047
  • Keywords: alkynes, heterocycles, N-propargylic beta-enaminones, nucleophilic cyclization, propargyl group, pyrroles, ONE-POT SYNTHESIS, INTRAMOLECULAR CYCLIZATION, MEDICINAL CHEMISTRY, TERMINAL ALKYNES, POLYSUBSTITUTED PYRROLES, CLAISEN REARRANGEMENT, SUBSTITUTED PYRROLES, SELECTIVE SYNTHESIS, CASCADE SYNTHESIS, EASY ACCESS

Abstract

A new method for the synthesis of 4-propargyl-substituted 1H-pyrroles is described. When treated with sodium hydride in refluxing dichloromethane, N-(5-phenyl-2,4-pentadiynyl) beta-enaminones, synthesized by the coupling of N-propargylic beta-enaminones with phenylacetylene, afforded 4-propargyl-substituted pyrrole derivatives. This conversion was general for a variety of N-(5-phenyl-2,4-pentadiynyl) beta-enaminones and displayed broad functional group tolerance. During the reaction, not only cyclization of linear precursors to pyrrole ring takes place, but also propargyl group is introduced to pyrrole core in one-pot. The enrichment of pyrrole compounds with a propargyl unit might exhibit potential for the synthesis of heterocyclic molecules of pharmacological interest.