852852-98-3Relevant academic research and scientific papers
Remote, Late-Stage Oxidation of Aliphatic C-H Bonds in Amide-Containing Molecules
Nanjo, Takeshi,De Lucca, Emilio C.,White, M. Christina
supporting information, p. 14586 - 14591 (2017/10/24)
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(sp3)-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.
N-methylation of peptides on selected positions during the elongation of the peptide chain in solution phase
Di Gioia, M. Luisa,Leggio, Antonella,Liguori, Angelo
, p. 3892 - 3897 (2007/10/03)
An efficient and general solution-phase method for the site-specific N-methylation of peptides has been developed. This novel procedure involves synthesis of N-nosyl protected peptides and their subsequent N-methylation with diazomethane. Its efficiency w
