The present invention relates to the preparation of compounds of the general formula II
which can be obtained by 1,4 addition of 2-oxoalkanoates or 2-oxocarboxylic acids onto the appropriate ketones. The present invention also relates to the use of the PigD protein for catalysis of 1,4 additions of 2-oxoalkanoates/-carboxylic acids, for example pyruvate/pyruvic acid or 2-oxobutyrate/2-oxobutyric acid, onto aliphatic, aromatic and heterocyclic α,β-unsaturated ketones. The 1,4 additions are effected here with CO
2
elimination. The use of the PigD protein as a catalyst in the aforementioned 1,4 additions enables the synthesis of addition products with stereoactive centers these addition products being preparable with an enantiomeric excess of more than 80% ee. The aliphatic, aromatic and heterocyclic α,β-unsaturated ketones which are suitable for the process are represented by the general formula I:
本发明涉及制备一般式II化合物的方法,该方法可以通过将2-
氧代烷酸
酯或2-
氧代
羧酸加成到适当的
酮上来获得。本发明还涉及利用PigD蛋白催化2-
氧代烷酸
酯/
羧酸的1,4加成,例如对
丙酮酸/
丙酮酸或2-
氧丁酸/2-
氧丁酸加成到
脂肪族、芳香族和杂环α,β-不饱和
酮上。这里的1,4加成是伴随着
CO2消除进行的。在上述1,4加成中使用PigD蛋白作为
催化剂,可以合成带有立体活性中心的加成产物,这些加成产物可以以超过80% ee的对映体过量制备。适用于该过程的
脂肪族、芳香族和杂环α,β-不饱和
酮由一般式I表示。