Application of the asymmetric aminohydroxylation reaction for the syntheses of HIV-protease inhibitor, hydroxyethylene dipeptide isostere and γ-amino acid derivative

An enantioselective synthesis of lactone 1, a precursor to the (2R,4S,5S) hydroxyethylene dipeptide isostere and amino acid AHPPA 2 has been accomplished from the common intermediate 5 employing Sharpless asymmetric aminohydroxylation as the key step.