Pd(II)-Catalyzed β-C(sp 3 )-H Alkynylation of Alanine in Di- and Tripeptides with Asn as an Endogenous Directing Group.

The introduction of alkyne moieties into peptides remains in demand as it represents a promising approach for further structural diversification of peptides. Herein, we describe the Pd(II)-catalyzed C(sp 3 )-H alkynylation of Ala-Asn-embedded di- and tripeptides using Asn as the endogenous lead group. In addition, a key building block for the glycopeptide Tyc4PG-14 and Tyc4PG-15 was produced by our methodology.