Synthesis of cyclic peptides constrained with biarylamine linkers using Buchwald-Hartwig C-N coupling.

In this paper, we describe the synthesis of conformationally constrained cyclic peptides with biarylamine linkers for peptidomimetics using palladium-catalyzed intramolecular Buchwald-Hartwig C-N coupling. We have prepared a variety of di-, tri-, and tetrapeptides (16-22-membered) in good yields using this reaction.