Iodine-mediated one-pot synthesis of indoles and 3-dimethylaminoindoles via annulation of enaminones

Alberto V. Jerezano, Ehecatl M. Labarrios, Fabiola E. Jiménez, María Carmen Del Cruz, Diana C. Pazos, Rsuini U. Gutiérrez, Francisco Delgado, Joaquín Tamariz

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Abstract

The synthesis of 2-carbonylindoles was achieved via a iodine-mediated cyclization of the corresponding enaminone precursors, which were formed by reaction of the ?-arylaminomethylene carbonyl derivatives with N,N'-dimethylformamide dimethyl acetal (DMFDMA). An alternative and more efficient procedure consisted of a similar cyclization of the enaminones, but under solvent-free and grinding reaction conditions. In another iodine-promoted procedure, 2-carbonyl-3-dimethylaminoindoles were synthesized via a one-pot cascade reaction between the α-arylaminomethylene carbonyl derivative and DMFDMA.

Original languageEnglish
Pages (from-to)18-53
Number of pages36
JournalArkivoc
Volume2014
Issue number3
DOIs
StatePublished - 31 Aug 2013

Keywords

  • 3-dimethylaminoindoles
  • DMFDMA
  • Enaminone
  • Grinding reaction
  • Indoles
  • Iodine
  • Solvent-free

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