Abstract
Catch that methyl: The first photoinduced intramolecular macrocyclization reaction in a helical peptide, containing a Bpa and a Met residue incorporated one on top of the other after a complete turn of the helix (see figure), has been performed. The photochemical remote functionalization and subsequent intramolecular cross-linking are strictly regioselective, involving exclusively the original Met side-chain ε-CH3 group and generating two diastereomeric macrocyclized peptides.
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