Chemoenzymatic Synthesis of a Trisaccharide–Serine Conjugate, Gal(β1-3)Gal(β1-4)Xyl(β1-O)–L-Ser, Use of Galactosyl Fluoride as a Donor for Transglycosylation
[EN] METHODS FOR GLYCOSYLATION<br/>[FR] PROCÉDÉS DE GLYCOSYLATION
申请人:UNIV MICHIGAN REGENTS
公开号:WO2020232194A1
公开(公告)日:2020-11-19
Provided herein are methods of glycosylation in the formation of disaccharides, trisaccharides, and oligosaccharides using fluoroglycosides, silyl ether glycosides and a triaryl borane catalyst.
本文提供了使用氟代糖苷、硅醚糖苷和三芳基硼烷催化剂在形成二糖、三糖和寡糖过程中的糖基化方法。
Streamlined Iterative Assembly of Thio‐Oligosaccharides by Aqueous
<i>S</i>
‐Glycosylation of Diverse Deoxythio Sugars
作者:Peng Wen、Peijing Jia、Qiuhua Fan、Bethany J. McCarty、Weiping Tang
DOI:10.1002/cssc.202102483
日期:2022.2.8
Step by step: A streamlined practical iterative synthesis of S-oligosaccharides is developed in aqueous solution without the need of protecting any of the hydroxy groups. Various deoxythio sugar building blocks can be prepared efficiently. The Ca(OH)2-promoted aqueous S-glycosylation can be realized with high chemo- and stereoselectivity.
Control of the ‘extended’E1cB mechanism of acyl group transfer in activated esters of acrylic acids
作者:Kenneth T. Douglas、Andrew Williams
DOI:10.1039/p29830000131
日期:——
Aminolysis and alkaline hydrolysis of aryl propenoates are shown to proceed via a normal nucleophilic substitution mechanism. The ‘extended’E1cBmechanism of hydrolysis involving attack of hydroxide ion at the β carbon followed by expulsion of the phenolate ion from the resulting carbanion is shown not to occur with the parent propenoate. The ‘extended’E1cBmechanism is taken by the hydrolysis of 2-cyano-3-
已证明丙酸芳基酯的氨解和碱水解是通过正常的亲核取代机理进行的。母体丙烯酸酯不会发生“扩展的” E 1cB水解机理,涉及氢氧根离子侵蚀β碳,然后从所得碳负离子中排出酚酸根离子。由于氰基对中间碳负离子的稳定作用,2-氰基-3-(4-甲氧基苯基)丙酸酯的水解具有“扩展的” E 1cB机理。
Verfahren zur Herstellung von Glycosiden mit Glycosidasen aus Ciliaten
申请人:HOECHST AKTIENGESELLSCHAFT
公开号:EP0725144A1
公开(公告)日:1996-08-07
Die Erfindung betrifft ein Verfahren zur Herstellung von Glycosiden durch enzymatische Glycosylierung mittels α- und β-Glycosidasen aus holotrichen Ciliaten und im besonderen aus Hymenostomatida.
Glycosidasen aus holotrichen Ciliaten eignen sich sehr gut zur enzymatischen Synthese von Alkylglycosiden, Glycopeptiden, Di- bzw. Oligosacchariden. Bevorzugte Glycosyldoren sind Nitrophenylglycoside, Glycosylfluoride oder Disaccharide, bevorzugte Akzeptoren sind kurzkettige Alkohole, Polyhydroxyverbindungen, insbesondere Monosaccharide, oder geschützte Hydroxyaminosäuren oder entsprechende Peptide.