Abstract
Smooth operation: C-terminal peptide activation with full stereointegrity was accomplished using a copper(II)-mediated coupling reaction of carboxylic acids with arylboroxines (see scheme, NCL = native chemical ligation, Boc = tert-butoxycarbonyl). This method allows epimerization-free activation and ligation of peptides with racemization-prone phenylglycine at the C terminus.
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