通过CGTase成功地由Macerans芽孢杆菌CGTase合成了新型2-(β-低聚丙氧基)-(甲基)丙烯酸乙酯单体,催化了2-(β-葡糖氧基)-丙烯酸乙酯和甲基丙烯酸与α-环糊精或淀粉的偶联。HPLC-UV分析表明,CGTase催化的反应生成具有1至15个吡喃葡萄糖基单元的2-(β-麦芽低聚氧基)-丙烯酸乙酯。1 H NMR光谱显示,在CGTase催化的偶联反应过程中,受体分子中的β-键得以保留,而新引入的葡萄糖单元则通过α-(1,4)-糖苷键连接。合成的2-(β-低聚丙氧基)-丙烯酸乙酯单体通过水性自由基聚合成功聚合,得到梳形的糖聚合物聚(2-(β-低聚丙氧基)-丙烯酸乙酯)。
Enzymatic Synthesis of 2-(β-Galactosyl)-ethyl Methacrylate by β-Galactosidase from <i>Pyrococcus woesei</i> and Application for Glycopolymer Synthesis and Lectin Studies
for the synthesis of glycosides by transglycosylation reactions. Especially glycosidases from hyperthermophilic bacteria are useful for reactions under extreme reaction conditions, e.g., in the presence of organic solvents. We herein report the facile enzymatic synthesis and purification of 2-(β-galactosyl)-ethyl methacrylate (Gal-EMA) with the recombinant hyperthermostable glycosidase from Pyrococcus
Chemo-enzymatic synthesis route to poly(glucosyl-acrylates) using glucosidase from almonds
作者:Wouter M. J. Kloosterman、Steven Roest、Siti R. Priatna、Erythrina Stavila、Katja Loos
DOI:10.1039/c3gc41115j
日期:——
Novel types of glucosyl-acrylate monomers are obtained by β-glucosidase from almond catalyzed glycosidation reaction. The saccharide-acrylate monomers were synthesized by reaction of D-glucose with hydroxyl functional acrylates: 2-hydroxyethyl acrylate (2-HEA), 2-hydroxyethyl methacrylate (2-HEMA) and 4-hydroxybutyl acrylate (4-HBA). The reaction products could be identified as 2-(β-glucosyloxy)-ethyl acrylate, 2-(β-glucosyloxy)-ethyl methacrylate and 4-(β-glucosyloxy)-ethyl acrylate respectively. The synthesis yield was optimized by variation of the 2-HEA–water ratio, the presence of water-miscible co-solvents and the reaction time. The optimal reaction mixture was found to contain 13 vol% water, 80 vol% 2-HEA and 7 vol%; 1.4-dioxane. The maximal yield under these conditions was 50 wt% based on D-glucose after 24 hours of reaction. The enzymatically synthesized glucosyl-acrylates were successfully polymerized by free radical polymerization in DMF and water. The glycosidic linkage of the glycosyl-acrylate monomers was retained during the polymerization process. The enzymatically synthesized glucosyl-acrylates could be successfully copolymerized with vinyl monomers 2-HEA, 2-HEMA, methacryl amide and N-vinyl imidazole.
Gold(III) activation of unprotected propargyl glycosyl donors has been shown to be effective for the synthesis of saccharides. Terminal propargyl glycosides of glucose, galactose, and mannose required heating at reflux in acetonitrile with 5% AuCl(3) for reaction with various primary alcohol acceptors, the latter used in 10-fold molar excess relative to donor. Donors containing the 2-butynyl group were more reactive, giving good yields of glycoside products at lower temperatures Secondary alcohols could also be used but with diminished efficiency. The propargylic family of donors is especially convenient because they can be easily prepared on large scale by Fischer glycosylation and stored indefinitely before chemoselective activation by the catalyst.
PROCESS FOR PRODUCING GLYCOSIDES OF ACRYLATE DERIVATIVES EMPLOYING SACCHARIDES AND GLYCOSIDASES
申请人:BASF SE
公开号:EP2598647A1
公开(公告)日:2013-06-05
ENZYMATIC PRODUCTION OF AN ETHYLENICALLY UNSATURATED GLYCOSIDE
申请人:KELLER Harald
公开号:US20120028308A1
公开(公告)日:2012-02-02
Ethylenically unsaturated glycosides of formula I
wherein n, A, X, R
3
and R
4
have the meanings given in the description are produced by reacting an ethylenically unsaturated alcohol of formula II
with a saccharide of formula III
in the presence of a glycosidase, such as an amylase, cellulase, glucosidase or galactosidase,
(i) at a molar ratio of ethylenically unsaturated alcohol of formula II to saccharide of formula III of from
2:1
to
30:1;
(ii) in the presence of a solvent mixture of water and a water miscible organic solvent that is no primary or secondary alcohol, such as acetone, acetonitrile, t-pentanol, t-butanol,
1,4
-dioxane and tetrahydrofuran, at a weight ratio of water to organic solvent of from
0.1:1
to
9:1
; and
(iii) at a weight ratio of solvent mixture to saccharide of from
3:1
to
30:1.