作者:Kazuyuki Yasukawa、Ryuji Hasemi、Yasuhisa Asano
DOI:10.1002/adsc.201100360
日期:2011.9
(R)‐α‐aminobutyric acid whose optical purity was more than 99%. (S)‐α‐Aminobutyric acid was also synthesized from α‐aminobutyronitrile by NHase, ACL racemase and L‐amino acid amidase from Brevundimonas diminuta TPU 5720. In a similar manner, other (R)‐ or (S)‐α‐amino acids with more than 97.5% ee could be synthesized from the corresponding α‐aminonitriles. This is the first report on the dynamic kinetic resolution
我们已经成功地从外消旋α-氨基丁腈酶促合成(R)-α-氨基丁酸。这已经通过使用从非立体选择性的腈水合酶(腈水合酶)的证明混浊红球菌71D,d从-aminopeptidase人苍白杆菌C1-38和从α氨基ε己内酰胺(ACL)消旋酶无色杆菌obae。外消旋的α-氨基丁腈在30°C的6小时内完全转化为(R)-α-氨基丁酸,其光学纯度超过99%。(S)-α-氨基丁酸还可以通过短小Brevundimonas diminuta的NHase,ACL消旋酶和L-氨基酸酰胺酶由α-氨基丁腈合成TPU5720。以类似的方式,可以从相应的α-氨基腈合成ee大于97.5%的其他(R)-或(S)-α-氨基酸。这是关于α-氨基腈形成手性α-氨基酸的动态动力学拆分(DKR)的第一份报告。该DKR中的关键酶是非立体选择性NHase,它是从土壤样品中新筛选出来的,并已克隆了其基因。