Asymmetric Synthesis of (+)-Phosphinothricin and Related Compounds by the Michael Addition of Glycine Schiff Bases to Vinyl Compounds
作者:Nobuto Minowa、Masao Hirayama、Shunzo Fukatsu
DOI:10.1246/bcsj.60.1761
日期:1987.5
(S)-(+)-Phosphinothricin was prepared in good optical yield by the Michael addition of chiral glycine Schiff base derived from (S)-2-hydroxy-3-pinanone to vinyl phosphorus compound. (R)-(−)-Phosphinothricin, an enantiomeric isomer, can also be prepared from the same chiral glycine Schiff base by choosing suitable reaction temperature.
positively charged amino acids or aromatic amino acids at position 375. The desired biocatalytic system was constructed by coupling the engineered LcGluDH and an NAD+-dependent FDH. Through this biocatalytic system, the batch production of l-PPT exhibited high space-time yield (207.3 g ⋅ L−1 ⋅ day−1) with strict stereoselectivity (ee of l-PPT>99%). Furthermore, eight other chiral amino acids were synthesised
手性氨基酸广泛应用于医药、食品、化妆品和农业等行业。作为一个代表性的例子,l-膦丝菌素(l- PPT,一种手性非天然氨基酸)是一种广谱除草剂。非常需要一种 NAD(H) 驱动的高效、低成本的手性氨基酸不对称合成生物催化系统(专注于l- PPT)。开发这种生物催化体系的关键是获得对l -PPT前酮PPO具有高催化性能的NADH依赖性生物催化剂。在此,一种来自堆肥赖氨酸芽孢杆菌( Lc ) 的工程谷氨酸脱氢酶通过基因挖掘和蛋白质工程获得具有所需活性的 GluDH)。计算机分析表明,底物结合袋的体积从 330.5 Å 3大幅扩大到 409.6 Å 3。通过在 375 位引入带正电荷的氨基酸或芳香族氨基酸,提高了Lc GluDH的稳定性( T m值从 47.3 °C 增加到 65.3 °C)。通过将工程化的Lc GluDH 和 NAD偶联构建所需的生物催化系统+ -依赖性FDH。通过该生物催化系统,l
A Single‐Transaminase‐Catalyzed Biocatalytic Cascade for Efficient Asymmetric Synthesis of
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‐Phosphinothricin
The herbicide phosphinothricin (PPT) is widely used, but current commercial PPT is a racemic mixture in which the inactive d‐form is harmful to the environment. As nonenzymatic synthesis is complex and costly, we have developed a biocatalytic cascade for l‐PPT catalyzed by a single transaminase that is high yielding (>90 %) within 24 hours and gives a high ee (>99 %).