decarboxylative amidation of α-ketoacids by using inexpensive tert-butyl hydroperoxide (TBHP), which is characterized by high yields, a broad substrate scope, mild reaction conditions, and a unique chemoselectivity. These features enable the synthesis of peptides from amino acid derived α-ketoacids under preservation of the stereochemical information.
widespread use of α‐aminoacid‐equivalent enolates for the preparation of non‐natural aminoacids, the utilization of β‐amino‐acid counterparts has been limited. This deficit has resulted in a short supply of β2, 2‐aminoacids bearing two substituents at the α‐carbon, especially for peptide synthesis. Herein, racemic 4‐substituted isoxazolidin‐5‐ones were used as precursors of β2‐aminoacid enolates in the