Steward KM, Corbett MT, Goodman CG, Johnson JS. Asymmetric synthesis of diverse glycolic acid scaffolds via dynamic kinetic resolution of α-keto esters.
J Am Chem Soc 2012;
134:20197-206. [PMID:
23186551 PMCID:
PMC3533366 DOI:
10.1021/ja3102709]
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Abstract
The dynamic kinetic resolution of α-keto esters via asymmetric transfer hydrogenation has been developed as a technique for the highly stereoselective construction of structurally diverse β-substituted-α-hydroxy carboxylic acid derivatives. Through the development of a privileged m-terphenylsulfonamide for (arene)RuCl(monosulfonamide) complexes with a high affinity for selective α-keto ester reduction, excellent levels of chemo-, diastereo-, and enantiocontrol can be realized in the reduction of β-aryl- and β-chloro-α-keto esters.
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