Expanding the Scope of Alcohol Dehydrogenases towards Bulkier Substrates: Stereo- and Enantiopreference for α,α-Dihalogenated Ketones
作者:Kinga Kędziora、Fabricio R. Bisogno、Iván Lavandera、Vicente Gotor-Fernández、Jose Montejo-Bernardo、Santiago García-Granda、Wolfgang Kroutil、Vicente Gotor
DOI:10.1002/cctc.201300834
日期:2014.4
two racemic α‐substituted ketones, namely α‐bromo‐ α‐chloro‐ and α‐chloro‐α‐fluoroacetophenone were investigated to obtain one of the four possible diastereoisomers through a dynamic kinetic process. In the case of the brominated derivative, only the (1R)‐enantiomer was obtained by using ADH‐A, although with moderate diastereomeric excess (>99 % ee, 63 % de), whereas the fluorinated ketone exhibited
醇脱氢酶(ADHs)被确定为还原相应的α,α-二卤代酮的合适酶,从而获得了具有出色转化率和对映体过量的光学纯的β,β-二氯或β,β-二溴代醇。在所测试的不同生物催化剂中,来自红球菌(Rhodococcus ruber)(ADH-A),Ralstonia sp。的ADH 。(RasADH),短乳杆菌(LBADH)和PR2ADH在活性和立体选择性方面被证明是最有效的。在进一步的研究中,研究了两种外消旋的α-取代的酮,即α-溴-α-氯和α-氯-α-氟苯乙酮,通过动态动力学过程获得了四种可能的非对映异构体之一。对于溴化衍生物,只有(1 R)-对映异构体是使用ADH-A获得的,尽管存在适度的非对映异构体过量(> 99%ee,63%de),而氟化酮显示出较低的立体选择性(高达45%de)。