A Substrate-Driven Approach to Determine Reactivities of α,β-Unsaturated Carboxylic Esters Towards Asymmetric Bioreduction
作者:Gábor Tasnádi、Christoph K. Winkler、Dorina Clay、Nargis Sultana、Walter M. F. Fabian、Mélanie Hall、Klaus Ditrich、Kurt Faber
DOI:10.1002/chem.201200990
日期:2012.8.13
The degree of CC bond activation in the asymmetric bioreduction of α,β‐unsaturated carboxylic esters by ene‐reductases was studied, and general recommendations to render these “borderline‐substrates” more reactive towards enzymatic reduction are proposed. The concept of “supported substrate activation” was developed. In general, an additional α‐halogenated substituent proved to be beneficial for enzymatic
研究了烯还原酶对α,β-不饱和羧酸酯的不对称生物还原中CC键的活化程度,并提出了一般建议,以使这些“边界底物”对酶促还原反应更具活性。开发了“支持的底物活化”的概念。通常,另外一个α-卤代取代基被证明对酶活性有益,而β-烷基或β-芳基取代基对非卤代底物的反应性有害,而α-氰基几乎没有作用。发现酯官能度的醇部分对反应速率具有强烈影响。总体而言,活动取决于空间效果和电子效果。