Application of Threonine Aldolases for the Asymmetric Synthesis of α-Quaternary α-Amino Acids
作者:Julia Blesl、Melanie Trobe、Felix Anderl、Rolf Breinbauer、Gernot A. Strohmeier、Kateryna Fesko
DOI:10.1002/cctc.201800611
日期:2018.8.21
acids with perfect stereoselectivity for the α‐quaternary center through the action of l‐ and d‐specific threonine aldolases. A wide variety of aliphatic and aromatic aldehydes were accepted by the enzymes and conversions up to >80 % were obtained. In the case of d‐selective threonine aldolase from Pseudomonas sp., generally higher diastereoselectivities were observed. The applicability of the protocol
我们报道了通过l-和d-特异性苏氨酸醛缩酶的作用,合成了多种 β-羟基-α,α-二烷基-α-氨基酸,对 α-四元中心具有完美的立体选择性。酶可以接受多种脂肪族和芳香族醛,并且转化率高达 >80%。对于来自假单胞菌属的d-选择性苏氨酸醛缩酶,通常观察到较高的非对映选择性。通过以制备规模进行酶促反应证明了该方案的适用性。使用假单胞菌属的d-苏氨酸醛缩酶,用非对映异构体一步生成制备量的 (2 R ,3 S )-2-氨基-3-(2-氟苯基)-3-羟基-2-甲基丙酸比率 >100 有利于顺式产品。 Birch型还原能够从( 2S )-2-氨基-3-羟基-2-甲基-3-苯基丙酸中还原除去β-羟基,通过两个反应生成对映体纯l -α-甲基-苯丙氨酸。 ‐一步化学酶转化。