Nucleophilic Iron Complexes in Proton-Transfer Catalysis: An Iron-Catalyzed Dimroth Cyclocondensation

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Aslihan Baykal - , University of Stuttgart (Author)
  • Dihan Zhang - , University of Stuttgart (Author)
  • Jakob Knelles - , University of Stuttgart (Author)
  • Isabel T. Alt - , University of Stuttgart (Author)
  • Bernd Plietker - , University of Stuttgart (Author)

Abstract

The nucleophilic iron complex Bu4N[Fe(CO)3(NO)] (TBA[Fe]) is an active catalyst in C−H-amination but also in proton-transfer catalysis. Herein, we describe the successful use of this complex as a proton-transfer catalyst in the cyclocondensation reaction between azides and ketones to the corresponding 1,2,3-triazoles. Cross-experiments indicate that the proton-transfer catalysis is significantly faster than the nitrene-transfer catalysis, which would lead to the C−H amination product. An example of a successful sequential Dimroth triazole–indoline synthesis to the corresponding triazole-substituted indolines is presented.

Details

Original languageEnglish
Pages (from-to)3003-3010
Number of pages8
JournalChemistry - an Asian journal
Volume14
Issue number17
Publication statusPublished - 2 Sept 2019
Peer-reviewedYes
Externally publishedYes

External IDs

PubMed 31310438
ORCID /0000-0001-8423-6173/work/161891580

Keywords

ASJC Scopus subject areas

Keywords

  • cyclocondensation–C−H-amination, Dimroth cyclocondensation, homogeneous catalysis, iron, triazoles