A new synthetic route for the γ-lactone precursors of hydroxyethylene dipeptide isosteres
摘要:
Delta-Phthalimido-gamma-ketoesters were obtained by the Pd catalyzed coupling reaction between acid chlorides and organozinc reagents derived from beta-iodoesters, and were converted into the gamma-lactone precursors of Phe-psi[H.E.]-Ala and Phe-psi[H.E.]-Pro (15a,b-18a,b).