There are several reports on the synthesis of alkylamines, but most of the reported methods are not suitable for the synthesis of hindered amines. In this research, we found that a coppercatalyst is effective for the formation of congested C−N bonds at room temperature. Control experiments revealed that a copperamide is a key intermediate. Moreover, when a chiral amine was used, a quaternary carbon
Chemoselective Peptidomimetic Ligation Using Thioacid Peptides and Aziridine Templates
作者:Naila Assem、Aditya Natarajan、Andrei K. Yudin
DOI:10.1021/ja104488d
日期:2010.8.18
Chemoselective peptidomimetic ligation has been made possible using thioacid peptides and NH aziridine-terminated amino acids and peptides. In the course of this reaction, a reduced amide bond is incorporated into the backbone of a peptide. This process enables incorporation of reduced cysteine, reduced substituted cysteine, reduced phenylalanine, and reduced alanine. Our method should be adaptable to other unnatural amino acid residues at the ligation site. Experiments aimed at evaluating the chemoselectivity of this process in the presence of competing thiol nucleophiles suggest high specificity at micromolar concentrations. This holds even in the presence of glutathione, which neutralizes xenobiotic electrophiles in cells.