Diastereoselective Synthesis of Oxazoloisoindolinones via Cascade Pd-Catalyzed ortho-Acylation of N‑Benzoyl α‑Amino Acid Derivatives and Subsequent Double Intramolecular Cyclizations

The first cascade diastereoselective synthesis of oxazoloisoindolinones via the palladium-catalyzed decarboxylative ortho-acylation of N-benzoyl α-amino acid derivatives followed by double intramolecular cyclizations has been demonstrated. This reaction, using α-amino acids as directing groups and α-oxocarboxylic acids as the acylation source, features a broad substrate scope, good functional group tolerance, high regioselectivity, and excellent diastereoselectivity.