Nickel-catalyzed oxidative C-H/N-H annulation of N-heteroaromatic compounds with alkynes

Atsushi Obata, Akane Sasagawa, Ken Yamazaki, Yusuke Ano, Naoto Chatani

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

The reaction of N-heteroaromatic compounds, such as 2-aryl-pyrrole, benzimidazole, imidazole, indole, and pyrazole derivatives, with alkynes in the presence of a catalytic amount of a nickel complex results in C-H/N-H oxidative annulation. The reaction shows a high functional group compatibility. While both Ni(0) and Ni(ii) complexes show a high catalytic activity, Ni(0) is proposed as a key catalytic species in the main catalytic cycle. In the case of the Ni(ii) system, the presence of a catalytic amount of a strong base, such as KOBut, is required for the reaction to proceed. In sharp contrast, a base is not required in the case of the Ni(0) system. The proposed mechanism is supported by DFT studies.

Original languageEnglish
Pages (from-to)3242-3248
Number of pages7
JournalChemical Science
Volume10
Issue number11
DOIs
Publication statusPublished - 2019
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)

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