Mahato SK, Chatani N. Carboxylate-Assisted Iridium (III)-Catalyzed C(sp
2)-H Amidation of 2-Aroylimidazoles With Dioxazolones.
J Org Chem 2022;
87:8183-8193. [PMID:
35666267 DOI:
10.1021/acs.joc.2c00949]
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Abstract
The Ir(III)-catalyzed ortho C-H amidation of 2-aroylimidazoles with 3-aryldioxazolones as an amidating reagent is reported. The method provides a broad substrate scope with wide functional group compatibility. Mechanistic studies indicate that C-H bond cleavage is reversible and appears not to be the rate-determining step. The presence of an electron-donating group in the 2-aroylimidazoles and an electron-withdrawing group in the 3-aryldioxazoles significantly accelerates the reaction, suggesting that nitrene insertion is the rate-determining step.
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