Regio- and Stereoselective Reduction of Diketones and Oxidation of Diols by Biocatalytic Hydrogen Transfer
作者:Klaus Edegger、Wolfgang Stampfer、Birgit Seisser、Kurt Faber、Sandra F. Mayer、Reinhold Oehrlein、Andreas Hafner、Wolfgang Kroutil
DOI:10.1002/ejoc.200500839
日期:2006.4
The asymmetric reduction of symmetrical and nonsymmetrical diketones as well as the stereoselectiveoxidation of various diols by biocatalytic hydrogen transfer was investigated by employing lyophilized cells of Rhodococcus ruber DSM 44541 containing alcohol dehydrogense ADH-‘A’. Symmetrical and nonsymmetrical diketones at the (ω-1)- and (ω-2)-positions are reduced to the Prelog product with high stereopreference
Enzymatic kinetic resolution of internal propargylic diols. Part I: a new approach for the synthesis of (S)-pent-2-yn-1,4-diol, a natural product from Clitocybe catinus
作者:Jeiely G. Ferreira、Cleverson R. Princival、Dyego M. Oliveira、Renata X. Nascimento、Jefferson L. Princival
DOI:10.1039/c5ob00386e
日期:——
Employing a two round sequence EKR, mono- and bis-acetoxy propargylic products were obtained in a high enantiomeric ratio (E > 200). The efficiently resolved chiral 8b was applied in a concise synthesis of (S)-1b, an optically active natural product produced by fungi Clitocybe catinus.
The enantioselective reduction of ω-hydroxy-β-ketoalkyl phenylsulfones with bakers’ yeast gives (S)-ω,β-dihydroxyalkyl phenylsulfones, which are convenient precursors for optically active lactones as shown in the synthesis of (R)-4-hexanolide and (R)-umbelactone.