Klebsiellapneumoniae (NBRC 3319) Mediated Asymmetric Reduction of α-Substituted β-Oxo Esters and Its Application to the Enantioiselective Synthesis of Small-Ring Carbocycle Derivatives
作者:Rajib Bhuniya、Tridib Mahapatra、Samik Nanda
DOI:10.1002/ejoc.201101695
日期:2012.3
Ketoreductases from Klebsiella pneumoniae (NBRC3319) selectively reduce several 2-substituted ethyl 3-oxobutyrates to yield the corresponding syn-β-hydroxy esters with remarkable stereocontrol (de > 99 %, ee > 99 %). The enantiopure hydroxy oxo esters were synthetically manipulated to access new small-ringcarbocycles.
Stereoselective Synthesis of Enantiopure Oxetanes, a Carbohydrate Mimic, an ϵ-Lactone, and Cyclitols from Biocatalytically Derived β-Hydroxy Esters as Chiral Precursors
Biocatalyticallyderivedenantiopure α-substituted β-hydroxyesters serve as excellent chirons for the synthesis of a diverse set of structures such as oxetanes, a carbohydratemimic, an ϵ-lactone, and carbocyclic and aromatic cyclitols. The starting materials can be easily accessed in enantiopure form from α-substituted β-keto esters by biocatalytic reduction with Klebsiella pneumoniae (NBRC 3319)