methyl β-D-galactopyranosyl-(1->4)-α-L-fucopyranosyl-(1->3)-2-acetamido-2-deoxy-β-D-glucopyranoside

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: methyl β-D-galactopyranosyl-(1->4)-α-L-fucopyranosyl-(1->3)-2-acetamido-2-deoxy-β-D-glucopyranoside
• 英文别名: Galβ1-4(Fucα1-3)GlcNAcβ1-OMe；Lewis x；β-D-Gal-(1,4)-[α-L-Fuc-(1,3)]-β-D-GlcNAc-(1,O)-CH₃；β-D-Gal-(1,4)-[α-L-Fuc-(1,3)]-β-D-GlcNAc-(1,O)-CH3；Le x；alpha-L-Fucp-(1->3)-[beta-D-Galp-(1->4)]-beta-D-GlcpNAc-OMe；N-[(2R,3R,4R,5S,6R)-6-(hydroxymethyl)-2-methoxy-5-[(2S,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-4-[(2S,3S,4R,5S,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyoxan-3-yl]acetamide
• 化学式: C₂₁H₃₇NO₁₅
• 分子量: 543.522
• InChiKey: RWKWUCRJWBOBDY-PQEMEVISSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -5.3
• 重原子数：
  37
• 可旋转键数：
  8
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.95
• 拓扑面积：
  246
• 氢给体数：
  9
• 氢受体数：
  15

反应信息

• 作为产物：
  描述：

  2-脱氧-2-苯二酰亚胺-1,3,4,6-四-氧-乙酰-β-D-吡喃葡萄糖 在 吡啶 、 N-碘代丁二酰亚胺 、 碘代三甲硅烷 、 三氟甲磺酸 、 三氟甲磺酸三甲基硅酯 、 三氟化硼乙醚 、 sodium methylate 、 对甲苯磺酸 、 乙二胺 、 三乙胺 、 乙硫醇 作用下， 以 甲醇 、 乙醚 、 二氯甲烷 、 乙腈 、 仲丁醇 为溶剂， 反应 59.83h， 生成 methyl β-D-galactopyranosyl-(1->4)-α-L-fucopyranosyl-(1->3)-2-acetamido-2-deoxy-β-D-glucopyranoside
  参考文献：
  名称：

  Synthesis of Lex-neoglycoconjugate to study carbohydrate–carbohydrate associations and its intramolecular interaction

  摘要：

  A straightforward synthetic strategy for the preparation of the Le(x) neoglycoconjugate (11,11'-dithio bis[undecanyl-beta-D-galactopyranosyl-(1-->4)-alpha-L-fucopyranosyl-(1-->3)-2-acetamido-2-deoxy-beta-D-glucopyranoside]) and methyl Le(x) glycoside starting from the same trisaccharide donor is reported. This donor represents a very useful precursor for the construction of Le(x) derivatives. The Le(x) neoglycoconjugate has allowed the preparation of polyvalent gold glyconanoparticles and self-assembled monolayers on gold. H-1 NMR of the Le(x) neoglycoconjugates suggests an intramolecular Le(x)-Le(x) cis-interaction in water, which is destroyed by addition of methanol. (C) 2002 Elsevier Science Ltd. All rights reserved.

  DOI：

  10.1016/s0957-4166(02)00480-9

文献信息

• Generalizing Glycosylation:  Synthesis of the Blood Group Antigens Le^a, Le^b, and Le^x Using a Standard Set of Reaction Conditions
  作者：Lin Yan、Daniel Kahne

  DOI：10.1021/ja9608555

  日期：1996.1.1

  glycosylation method under one set of reaction conditions. In this paper, we show that the sulfoxide glycosylation method can be used to form all of the glycosidic linkages in the Lewis blood group antigens Lea (1), Leb (2), and Lex (3) stereoselectively under a uniform set of reaction conditions. This work highlights the flexibility of the sulfoxide method and demonstrates its utility for constructing families

  由于任何糖基化方法都没有通用的反应条件，因此世界上只有少数实验室才能制造出具有生物学意义的寡糖。为了让非专业人士也能合成碳水化合物，关键是要有一种糖基化方法，可以在单一条件下在多种情况下发挥作用。由于结构复杂，Lewis 血型抗原引起了许多合成碳水化合物组的注意。尽管它们已被多次合成，但从未在一组反应条件下使用单一糖基化方法制备它们。在本文中，我们表明亚砜糖基化方法可用于形成路易斯血型抗原 Lea (1)、Leb (2)、和 Lex (3) 在一组统一的反应条件下立体选择性地进行。这项工作突出了亚砜方法的灵活性，并证明了其在构建相关族中的效用...
• Synthesis of Lewis X and three Lewis X trisaccharide analogues in which glucose and rhamnose replace N-acetylglucosamine and fucose, respectively
  作者：Ari Asnani、France-Isabelle Auzanneau

  DOI：10.1016/j.carres.2008.04.017

  日期：2008.7

  Three analogues of the Le(x) trisaccharide: alpha-L-Fucp-(1 -> 3)-[beta-D-Galp-(1 -> 4)]-D-GlcNAcp as well as the Le(x) trisaccharide itself were synthesized as methyl glycosides. In the analogues, either only the fucose residue is replaced by rhamnose or both the N-acetylglucosamine and the fucosyl residues are replaced by glucose and rhamnose, respectively. Our synthetic strategy relied on the use of lactoside and 2-azido lactoside derivatives as disaccharide acceptors, which were submitted to either fucosylation or rhamnosylation. Our results confirm that the reactivity of lactose in protection and glycosylation reactions is greatly affected by (1) the structure of the aglycone and (2) the presence of an azido substituent at C-2 of the glucose moiety. Thus, a methyl lactoside acceptor was easily glycosylated at O-3 with perbenzylated P-thiophenyl fucoside and rhamnoside to give anomerically pure alpha-fucosylated and alpha-rhamnosylated trisaccharides, respectively. In contrast, the same reactions on a 2-azido methyl lactoside acceptor led to the formation of anomeric mixtures. While the alpha- and beta-fucosylated 2-azido trisaccharides could be separated by RP-HPLC, such separation was not possible for the rharmnosylated anomers. The desired rhamnosylated trisaccharide was finally obtained anomerically pure using an isopropylidene-protected rhanmosyl donor. The deprotection sequences also showed that the presence of a 2-azido substituent at C-2 of the glucose residue conferred stability to the vicinal facosidic linkage at C-3. To test their relative affinity for anti-Le(x) Abs the Lex analogues will be used as competitive inhibitors against methyl Le(x). In addition, their conformational behavior will be studied by NMR spectroscopy and molecular modeling experiments. (C) 2008 Elsevier Ltd. All rights reserved.