Photoredox Catalyzed Oxidative C-H Alkylation of Glycine Derivatives with 4-alkyl-1,4-dihydropyridines

Herein, oxidative α-C(sp³)-H alkylation of N-arylated glycine derivatives with 4-alkyl dihydropyridine derivatives (alkyl-DHPs) as versatile alkyl radical precursors has been developed. Utilizing visible light-driven photoredox catalysis and ammonium persulfate as an oxidizing agent, this methodology facilitates the site-selective alkylation of glycine derivatives, enabling the site selective alkylation of peptides. The reaction exhibits broad substrate scope, including various alkyl radicals and acid-labile functional groups. This approach expands the synthetic toolbox in peptide chemistry, offering a mild and efficient method for the synthesis of modified peptides.