ethyl 2,3,4-tri-O-benzyl-1-thio-6-O-(triphenylmethyl)-β-D-galactopyranoside | 311797-16-7

• 分子结构分类: 有机化合物 - 苯类化合物 - 三苯基化合物
• 英文名称: ethyl 2,3,4-tri-O-benzyl-1-thio-6-O-(triphenylmethyl)-β-D-galactopyranoside
• 英文别名: ethyl 2,3,4-tri-O-benzyl-6-O-trityl-1-thio-β-D-galactopyranoside
• CAS: 311797-16-7
• 化学式: C₄₈H₄₈O₅S
• 分子量: 736.972
• InChiKey: YNBIUQNSUNTHFM-YECKJZEXSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  10.23
• 重原子数：
  54.0
• 可旋转键数：
  17.0
• 环数：
  7.0
• sp3杂化的碳原子比例：
  0.25
• 拓扑面积：
  46.15
• 氢给体数：
  0.0
• 氢受体数：
  6.0

反应信息

• 作为反应物：
  描述：

  ethyl 2,3,4-tri-O-benzyl-1-thio-6-O-(triphenylmethyl)-β-D-galactopyranoside 在 4 A molecular sieve 、 四乙基溴化铵 、 对甲苯磺酸 、 DMTST 作用下， 以 甲醇 、 乙醚 、 二氯甲烷 、 氯仿 、 N,N-二甲基甲酰胺 为溶剂， 反应 55.5h， 生成 2,3,4,6-tetra-O-benzyl-α-D-galactopyranosyl-(1->6)-2,3,4-tri-O-benzyl-α-D-galactopyranosyl-(1->3)-1,2,5,6-tetra-O-acetyl-α,β-D-galactofuranose
  参考文献：
  名称：

  Synthesis of the Leishmania LPG Core Heptasaccharyl myo-Inositol

  摘要：

  Total synthesis of the core heptasaccharyl myo-inositol, Galp(alpha1-6)Galp(alpha1-3)Galf(beta1-3)[Glcp(alpha1-PO4-6)Manp](alpha1-3)Manp(alpha1-4)GlcNp(alpha1-6)Ins-1-PO4, and the corresponding hexasaccharyl myo-inositol, Galp(alpha1-6)Galp(alpha1-3)Galf(beta1-3)Manp(alpha1-3)Manp(alpha1-4)GlcNp(alpha1-6)Ins-1-PO4, found in the lipophosphoglycans of Leishmania parasites are described. The target molecules contain synthetic challenges such as an unusual internal galactofuranosyl residue and an anomeric phosphodiester. The synthesis was accomplished using a convergent block synthetic strategy. Four building blocks, a trigalactoside, a dimannoside, a glucosyl inositolphosphate, and a glucosyl-alpha -1-H-phosphonate, all appropriately protected, were used. The trigalactoside was linked to the dimannoside followed by glycosylation with the glucosyl inositolphosphate to produce the fully protected hexasaccharyl myo-inositol. Subsequent oxidative coupling of the glucosyl-H-phosphonate formed the anomeric phosphodiester linkage to produce the protected heptasaccharyl myo-inositol. Both the assembly order of the subunits and sequence of deprotection were essential for the successful synthesis of these complex molecules. The deprotection was accomplished by deacetylation and clevage of benzyl ethers with sodium in liquid ammonia, followed by acidic deacetalization/desilylation to produce the target molecules.

  DOI：

  10.1021/ja001515t
• 作为产物：
  描述：

  1-硫代-Β-D-乙基半乳糖苷 在 吡啶 、 4-二甲氨基吡啶 、 sodium hydride 作用下， 以 N,N-二甲基甲酰胺 为溶剂， 反应 49.5h， 生成 ethyl 2,3,4-tri-O-benzyl-1-thio-6-O-(triphenylmethyl)-β-D-galactopyranoside
  参考文献：
  名称：

  Synthesis of the Leishmania LPG Core Heptasaccharyl myo-Inositol

  摘要：

  Total synthesis of the core heptasaccharyl myo-inositol, Galp(alpha1-6)Galp(alpha1-3)Galf(beta1-3)[Glcp(alpha1-PO4-6)Manp](alpha1-3)Manp(alpha1-4)GlcNp(alpha1-6)Ins-1-PO4, and the corresponding hexasaccharyl myo-inositol, Galp(alpha1-6)Galp(alpha1-3)Galf(beta1-3)Manp(alpha1-3)Manp(alpha1-4)GlcNp(alpha1-6)Ins-1-PO4, found in the lipophosphoglycans of Leishmania parasites are described. The target molecules contain synthetic challenges such as an unusual internal galactofuranosyl residue and an anomeric phosphodiester. The synthesis was accomplished using a convergent block synthetic strategy. Four building blocks, a trigalactoside, a dimannoside, a glucosyl inositolphosphate, and a glucosyl-alpha -1-H-phosphonate, all appropriately protected, were used. The trigalactoside was linked to the dimannoside followed by glycosylation with the glucosyl inositolphosphate to produce the fully protected hexasaccharyl myo-inositol. Subsequent oxidative coupling of the glucosyl-H-phosphonate formed the anomeric phosphodiester linkage to produce the protected heptasaccharyl myo-inositol. Both the assembly order of the subunits and sequence of deprotection were essential for the successful synthesis of these complex molecules. The deprotection was accomplished by deacetylation and clevage of benzyl ethers with sodium in liquid ammonia, followed by acidic deacetalization/desilylation to produce the target molecules.

  DOI：

  10.1021/ja001515t

文献信息

• Application of the Superarmed Glycosyl Donor to Chemoselective Oligosaccharide Synthesis
  作者：Laurel K. Mydock、Alexei V. Demchenko

  DOI：10.1021/ol800648d

  日期：2008.6.5

  discovered a novel method for "superarming" glycosyl donors. Herein, this concept has been exemplified in one-pot oligosaccharide syntheses, whereby the superarmed glycosyl donor was chemoselectively activated over traditional "armed" and disarmed glycosyl acceptors. Direct side-by-side comparison of the reactivities of the classic armed and superarmed glycosyl donors further validates the credibility of

  最近，我们发现了一种“超级武装”糖基供体的新方法。在本文中，这一概念已在单锅寡糖合成中得到例证，其中超武装的糖基供体比传统的“武装”和去武装的糖基受体被化学选择性地激活。经典武装和超级武装糖基供体的反应性的直接并排比较进一步验证了新概念的可信度。
• Synthesis of Homogalacturonan Fragments
  作者：Sven Kramer、Birte Nolting、Andrej-Jakob Ott、Christian Vogel

  DOI：10.1080/07328300008544125

  日期：2000.1

  Glycosylation of the D-galacturonic acid ester derivatives 15 and 17, which are prepared directly from D-galacturonic acid, with the thioglycosides 28 and 32, derived from the same sugar, provides alpha(1-->4)-linked dimers. The formation of the glycosidic linkage between the galacturonic acid moieties is best achieved by iodonium di-sym-collidine perchlorate promotion. Thus, the 4'-O-p-methoxybenzyl dimer 38 can be obtained in 64% yield. Partial deprotection of the 4'-O-position provided the glycosyl acceptor 36, which was coupled with the donor 32 to yield the alpha(1 "-->4')-linked trimer 39 (48%). Approximately 8% of the beta(1 "-->4')-coupled isomer was observed in the C-13 NMR spectrum of the reaction mixture.