Assay for the Enantiomeric Analysis of [<sup>2</sup>H<sub>1</sub>]-Fluoroacetic Acid: Insight into the Stereochemical Course of Fluorination during Fluorometabolite Biosynthesis in <i>Streptomyces cattleya</i>
作者:David O'Hagan、Rebecca J. M. Goss、Abdelkrim Meddour、Jacques Courtieu
DOI:10.1021/ja026654k
日期:2003.1.1
analysis of (R)- and (S)-[2H1]-fluoroacetate has been developed using 2H[1H]-NMR in a chiral liquid crystalline solvent. This has enabled biosynthetic experiments to be conducted which reveal stereochemical details on biological fluorination occurring during the biosynthesis of fluoroacetate and 4-fluorothreonine in the bacterium Streptomyces cattleya. In particular, feeding experiments to S. cattleya
在手性液晶溶剂中使用 2H[1H]-NMR 开发了一种用于 (R)-和 (S)-[2H1]-氟乙酸酯构型分析的灵敏方法。这使得能够进行生物合成实验,揭示在细菌 Streptomyces catyaya 中氟乙酸盐和 4-氟苏氨酸的生物合成过程中发生的生物氟化的立体化学细节。特别是,用同位素标记的 (1R, 2R)- 和 (1S, 2R)-[1-2H1]-甘油 3d 和 3e 和 [2,3-2H(4)]-琥珀酸酯 4a 对 S. catalya 进行饲养实验,得到上升到对映体富集的 [2-2H1]-氟乙酸盐样品 1a。
Biosynthesis of acaterin: Metabolic fate of sn-3 hydrogens of glycerol during the formation of 4-dehydroacaterin
The metabolic fate of the pro-R and pro-S hydrogens at the sn-C-3 position of glycerol during the formation of 4-dehydroacaterin has been investigated using Pseudomonas sp. A92. Feeding studies of sn-(3R)- and sn-(3S)-(3-2H)glycerols revealed that 5E hydrogen of 4-dehydraocaterin originates mainly from pro-R hydrogen at sn-C-3 of glycerol, while 5Z hydrogen comes mainly from pro-S. These results ruled
Enantio- and Stereoselective Syntheses of Monodeuterium-labeled Glycerols
作者:Kenji Yagi、Hideaki Oikawa、Akitami Ichihara
DOI:10.1271/bbb.61.1038
日期:1997.1
An efficient method is described for synthesizing and four possible diastereomers of stereochemically defined monodeuterated glycerols by utilizing Sharpless asymmetric dihydroxylation.
Site-Specific Hydrogen Isotope Fractionation in the Biosynthesis of Glycerol
作者:Ben-Li Zhang、Stephan Buddrus、Maryvonne L. Martin
DOI:10.1006/bioo.1999.1145
日期:2000.2
natural isotope fractionation (SNIF-NMR) produced in the glycolytic conversion of glucose into ethanol and glycerol provides isotopic transfer coefficients, a ij , which relate sites in the products to sites j in the reactants. The isotopic connection between the carbon-bound hydrogens of glycerol and those of glucose and water in fermentation reactions carried out with Saccharomycescerevisiae has been
摘要 对位点特异性天然同位素分馏 (SNIF-NMR) 进行的核磁共振研究提供了将产物中的位点与反应物中的位点 j 相关联的同位素转移系数 aij。已经研究了在用酿酒酵母进行的发酵反应中甘油的碳键氢与葡萄糖和水的碳键氢之间的同位素连接。a ij 系数提供了有关甘油氢谱系、磷酸丙糖异构化和磷酸二羟丙酮还原为 3-磷酸甘油的相对速率、还原的立体定向性、分子内和分子间氢的百分比的机械信息在反应过程中发生转移,以及活跃的整体动力学和热力学同位素效应的数量级。因此,在甘油的位点 3 pro-R(立体特异性编号)和 H 6 pro-R 之间以及在较小程度上确定葡萄糖的 H 2 以及甘油的位点 3 pro-S 与 H 6 pro-S 和 H 之间的密切联系1葡萄糖。此外,甘油的位点 2 与水有很强的相关性,也部分与葡萄糖有关。作为介质组成或环境条件的函数的同位素转移系数值的可能变化能够检测到机械扰动,例
A short synthesis of (1S,2R)- and (1R,2R)-[1-2H]-glycerols
作者:Jens Nieschalk、David O'Hagan
DOI:10.1016/s0957-4166(97)00219-x
日期:1997.7
(1S,2R)- and 1a and 1b is reported. The key asymmetric step involves an AD-mix-β dihydroxylation on deuterium labelled Z- and E-allyl benzoates 4a and 4b. The route should facilitate the use of [2H]-glycerols 1a−1d in high enantiomeric purity (95%ee) in biosynthesis investigations.