Exploring the Scope of an α/β-Aminomutase for the Amination of Cinnamate Epoxides to Arylserines and Arylisoserines
作者:Prakash K. Shee、Nishanka Dilini Ratnayake、Tyler Walter、Olivia Goethe、Edith Ndubuaku Onyeozili、Kevin D. Walker
DOI:10.1021/acscatal.9b01557
日期:2019.8.2
signals confirmed the diastereomeric ratios and relative stereochemistries. Application of a (2S)-threonine aldolase from E. coli further established the absolute stereochemistry of the chiral derivatives of the diastereomeric enzymatically derived products. The 2R:2S ratio for the biocatalyzed anti-isomers was highest (88:12) for 3′-NO2-phenylserine and lowest (66:34) for 4′-F-phenylserine. This showed
生物催化工艺的发展继续朝着发现替代转化反应以合成精细化学品的方向发展。在这里,来自加拿大红豆杉的5-甲叉基-3,5-二氢-4 H-咪唑-4-酮(MIO)依赖性苯丙氨酸氨基变位酶(Tc PAM)被不可逆转地用于生物催化分子间胺转移反应,该反应转化为环取代的反式-肉桂酸酯环氧化物外消旋体为其相应的芳基丝氨酸。在12种底物中,氨基变位酶将3'-Cl-肉桂酸环氧化物开环成3'-Cl-苯基丝氨酸的速度比其4'-Cl-异构体的打开速度快140倍,而在所有测试的环氧化物中,其翻转速度都最慢。对生物催化的苯基丝氨酸类似物的手性辅助衍生物的GC / MS分析表明,Tc PAM转氨反应可对映和非对映选择性地打开环氧化物。每个产品混合物含有(2小号)+(2 - [R )-反(赤)和(2小号)+(2 - [R )-顺式(苏式)对与该抗-异构体占主导地位(〜90:10 dr)。在积分邻位质子信号1个酶催化phenylserines的1