4.7 Article

DFT Studies on the Mechanism of the Rhodium(III)-Catalyzed C-H Activation of N-Phenoxyacetamide

Journal

JOURNAL OF ORGANIC CHEMISTRY
Volume 80, Issue 21, Pages 10686-10693

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.joc.5b01895

Keywords

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Funding

  1. National Natural Science Foundation of China [21573095]
  2. Fundamental Research Funds for the Central Universities [21615405]
  3. high-performance computing platform of Jinan University

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A density functional theory (DFT) study has been conducted to elucidate the mechanism of the rhodium(III)-catalyzed C-H activation of N-phenoxyacetamide, where the amido component of an internal oxidant serves as a leaving group. The impact of different substrates (alkynes versus cyclopropenes) on the reaction mechanism has been discussed in detail. The pathway for cyclopropene substrate proceeded via a Rh(V) nitrene, while Rh(III) remained unchanged throughout the pathway for alkyne substrate. The C-O bond-forming reductive elimination and O-N bond cleavage steps simultaneously occurred for the alkyne substrate. However, the C-O bond was formed by an electrocyclization from a Rh(III) intermediate for the cydopropene substrate. The energy profiles for the cyclopropene substrate were accompanied by a change in spin-state because the triplet spin state of a Rh(V) nitrene complex is lower than that of the singlet spin state.

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