Design, Synthesis, and Photochemistry of Modular Caging Groups for Photoreleasable Nucleotides
摘要:
A modular approach to preparing caged nucleotides having additional properties has been achieved. The modular caging agent includes three components: an amine reactive NHS ester moiety, a photoactive Bhc group, and tosylhydrazone as a precursor of the diazomethyl group. Various amines including biotin and an Arg-Gly-Asp (RGD) peptide were introduced into the key intermediate via amide linkage. The Bio-Bhc-diazo thus synthesized enables the preparation of a photoreleasable siRNA with additional properties.
C‐Terminal Bioconjugation of Peptides through Photoredox Catalyzed Decarboxylative Alkynylation
作者:Marion Garreau、Franck Le Vaillant、Jerome Waser
DOI:10.1002/anie.201901922
日期:2019.6.11
We report the first decarboxylative alkynylation of the C‐terminus of peptides starting from free carboxylic acids. The reaction is fast, metal‐free, and proceeds cleanly to afford alkynylated peptides with a broad tolerance for the C‐terminal amino acid. By the use of hypervalent iodine reagents, the introduction of a broad range of functional groups was successful. C‐terminal selectivity was achieved