A new cost-effective Ru-chloramphenicol base derivative catalyst for the asymmetric transfer hydrogenation/dynamic kinetic resolution of N-Boc α-amino-β-ketoesters and its application to the synthesis of the chiral core of vancomycin
Herein we describe the application of a series of newly developed Ru-chloramphenicol base derivative complexes as catalysts for the highly diastereo- and enantioselective transferhydrogenation of N-Boc α-amino-β-ketoesters for the asymmetricsynthesis of anti-N-Boc-β-hydroxy-α-amino esters. This report highlights the utility of this catalytic methodology for the preparation of pharmaceutical compounds
The use of asymmetrictransferhydrogenation combined with dynamic kinetic resolution for the synthesis of β-hydroxy-α-(tert-butoxycarbonyl)amino esters in water is described. This procedure provides the desired amino alcohols in good yields, diastereoselectivities, and enantioselectivities. A surfactant is employed to achieve good yields due to the hydrophobic nature of both the catalyst and substrate
The asymmetric transfer hydrogenation of alpha-amido-beta-keto esters to provide the corresponding anti-beta-hydroxy-alpha-amido esters in good to excellent yields, diastereoselectivity, and enantioselectivity is reported. The procedure is operationally simple, and delicate handling of the catalyst is not necessary.