Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 139, Issue 41, Pages 14586-14591Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b07665
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Funding
- NIGMS Maximizing Investigator's Research Award MIRA [R35 GM122525]
- Uehara Memorial Foundation
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico [234643/2014-5]
- Zoetis
- Bristol-Myers Squibb
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Amide-containing molecules are ubiquitous in natural products, pharmaceuticals, and materials science. Due to their intermediate electron-richness, they are not amenable to any of the previously developed N-protection strategies known to enable remote aliphatic C-H oxidations. Using information gleaned from a systematic study of the main features that makes remote oxidations of amides in peptide settings possible, we developed an imidate salt protecting strategy that employs methyl trifluoromethanesulfonate as a reversible alkylating agent. The imidate salt strategy enables, for the first time, remote, nondirected, site-selective C(sp(3))-H oxidation with Fe(PDP) and Fe(CF3PDP) catalysis in the presence of a broad scope of tertiary amides, anilide, 2-pyridone, and carbamate functionality. Secondary and primary amides can be masked as N-Ns amides to undergo remote oxidation. This novel imidate strategy facilitates late-stage oxidations in a broader scope of medicinally important molecules and may find use in other C-H oxidations and metal-mediated reactions that do not tolerate amide functionality.
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