methyl 2,6-di-O-benzoyl-4-O-(2,6-di-O-benzoyl-3,4-O-isopropylidene-β-D-galactopyranosyl)-3-O-(2,3,4-tri-O-benzyl-α-L-rhamnopyranosyl)-β-D-glucopyranoside | 1045775-00-5

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: methyl 2,6-di-O-benzoyl-4-O-(2,6-di-O-benzoyl-3,4-O-isopropylidene-β-D-galactopyranosyl)-3-O-(2,3,4-tri-O-benzyl-α-L-rhamnopyranosyl)-β-D-glucopyranoside
• CAS: 1045775-00-5
• 化学式: C₇₁H₇₂O₁₉
• 分子量: 1229.34
• InChiKey: LHUAXCQCMDQRSR-UOOVTZGPSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  10.04
• 重原子数：
  90.0
• 可旋转键数：
  24.0
• 环数：
  11.0
• sp3杂化的碳原子比例：
  0.35
• 拓扑面积：
  206.73
• 氢给体数：
  0.0
• 氢受体数：
  19.0

反应信息

• 作为反应物：
  描述：

  methyl 2,6-di-O-benzoyl-4-O-(2,6-di-O-benzoyl-3,4-O-isopropylidene-β-D-galactopyranosyl)-3-O-(2,3,4-tri-O-benzyl-α-L-rhamnopyranosyl)-β-D-glucopyranoside 在 sodium methylate 作用下， 以 甲醇 为溶剂， 以93%的产率得到
  参考文献：
  名称：

  Synthesis of Lewis X and three Lewis X trisaccharide analogues in which glucose and rhamnose replace N-acetylglucosamine and fucose, respectively

  摘要：

  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.

  DOI：

  10.1016/j.carres.2008.04.017
• 作为产物：
  描述：

  methyl 2,6-di-O-benzoyl-4-O-(2,6-di-O-benzoyl-3,4-O-isopropylidene-β-D-galactopyranosyl)-β-D-glucopyranoside 、 (2S,3S,4R,5R,6R)-3,4,5-Tris-benzyloxy-2-methyl-6-phenylsulfanyl-tetrahydro-pyran 在 N-碘代丁二酰亚胺 、 三氟甲磺酸 作用下， 以 二氯甲烷 为溶剂， 反应 0.25h， 以70%的产率得到methyl 2,6-di-O-benzoyl-4-O-(2,6-di-O-benzoyl-3,4-O-isopropylidene-β-D-galactopyranosyl)-3-O-(2,3,4-tri-O-benzyl-α-L-rhamnopyranosyl)-β-D-glucopyranoside
  参考文献：
  名称：

  Synthesis of Lewis X and three Lewis X trisaccharide analogues in which glucose and rhamnose replace N-acetylglucosamine and fucose, respectively

  摘要：

  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.

  DOI：

  10.1016/j.carres.2008.04.017