Enantioselective biocatalytic reduction of 2,2-disubstituted ethylacetoacetates: an indirect desymmetrization approach for the synthesis of enantiopure (S)-4-hydroxy-3,3-disubstituted pentane-2-ones
作者:Joydev Halder、Debabrata Das、Samik Nanda
DOI:10.1016/j.tetasy.2015.09.007
日期:2015.11
Ethyl 2,2-disubstituted-3-oxobutanoates were biocatalytically reduced to the corresponding (S)-ethyl 3-hydroxy-2,2-disubstitutedbutanoate with the growing cells of Klebsiella pneumoniae (NBRC 3319) with excellent enantioselection. The biocatalytically derived enantiopure hydroxyl esters were then synthetically manipulated to give (S)-4-hydroxy-3,3-disubstituted pentane-2-ones. The whole process can
随着肺炎克雷伯菌(NBRC 3319)的生长,具有优异的对映体选择性,将2,2-二取代的3-氧代丁酸乙酯生物催化还原为相应的(S)-乙基3-羟基-2,2-二取代的丁酸酯。然后将生物催化衍生的对映纯羟基酯进行合成处理,得到(S)-4-羟基-3,3-二取代戊烷-2-酮。整个过程可视为合成(S)-4-羟基-3,3-二取代戊烷-2-酮的间接对映选择性酶促不对称化方法。