2,3,4,6-Tetra-O-benzyl-D-galactopyranosyl trichloroacetimidate | 220542-34-7

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: 2,3,4,6-Tetra-O-benzyl-D-galactopyranosyl trichloroacetimidate
• 英文别名: 2,2,2-trichloro-N-[(3R,4S,5S,6R)-3,4,5-tris(phenylmethoxy)-6-(phenylmethoxymethyl)oxan-2-yl]acetamide
• CAS: 220542-34-7
• 化学式: C₃₆H₃₆Cl₃NO₆
• 分子量: 685.044
• InChiKey: CFYPOHMKLUHRHR-BJPULKCASA-N

计算性质

• 辛醇/水分配系数(LogP)：
  6.8
• 重原子数：
  46
• 可旋转键数：
  14
• 环数：
  5.0
• sp3杂化的碳原子比例：
  0.31
• 拓扑面积：
  75.2
• 氢给体数：
  1
• 氢受体数：
  6

反应信息

• 作为产物：
  描述：

  [(2R,3R,4S,5S,6R)-3,4,5-三苄氧基-6-(苄氧基甲基)四氢吡喃-2-基]2,2,2-三氯乙亚氨酸酯 在 三氟甲磺酸三甲基硅酯 、 benzyl 3,5,6-tri-O-benzoyl-β-D-galactofuranosyl-(1→4)-2-acetamido-3-O-benzoyl-6-O-tert-butyldiphenylsilyl-2-deoxy-α-D-glucopyranoside 作用下， 以 乙腈 为溶剂， 反应 72.0h， 以58%的产率得到2,3,4,6-Tetra-O-benzyl-D-galactopyranosyl trichloroacetimidate
  参考文献：
  名称：

  Synthesis of the hexasaccharide from Trypanosoma cruzi mucins with the Galp(1 → 2)Galf unit constructed with a superarmed thiogalactopyranosyl donor

  摘要：

  Hexasaccharide beta-D-Galp-(1 -> 2)-[beta-D-Galp-(1 -> 3)]-beta-D-Galp-(1 -> 6)-[beta-D-Galp-(1 -> 2)-beta-D-Galf-(1 -> 4)]-D-GlcNAc (1) was found O-linked in mucins of Trypanosoma cruzi epimastigotes and metacyclic trypomatigotes. Studies on the biological pathways and functionalities of the mucin oligosaccharides are prompted in order to understand the interactions of these molecules with the insect host. Trisaccharide constituent beta-D-Galp-(1 -> 2)-beta-D-Galf-(1 -> 4)-D-GlcNAc was constructed from the reducing to the non-reducing end. We discuss the difficulties to introduce a Galp unit at the O-2 position of a partially protected galactofuranosyl unit which were overcome using an anchimerically superarmed donor. By this route and employing a [3 + 3] nitrilium convergent approach hexasaccharide 1 was synthesized in moderate yield.

  DOI：

  10.1016/j.carres.2019.06.013

文献信息

• Design and Use of an Oxazolidine Silyl Enol Ether as a New Homoalanine Carbanion Equivalent for the Synthesis of Carbon-Linked Isosteres of <i>O</i>-Glycosyl Serine and <i>N</i>-Glycosyl Asparagine
  作者：Alessandro Dondoni、Alberto Marra、Alessandro Massi

  DOI：10.1021/jo981861h

  日期：1999.2.1

  A trimethylsilyl enol ether carrying the N-Boc 2,2-dimethyloxazolidine ring was designed to serve as a synthetic equivalent of the homoalanine carbanion for the introduction of the alpha-amino acid side chain at the anomeric carbon of sugars. This new functionalized silyl enol ether was prepared in multigram scale and high enantiomeric purity starting from methyl N-Boc-L-threoninate (six steps, 49%

  设计带有N-Boc 2，2-二甲基恶唑烷环的三甲基甲硅烷基烯醇醚，作为高丙氨酸碳负离子的合成等同物，用于在糖的异头碳处引入α-氨基酸侧链。从N-Boc-L-苏氨酸甲酯开始，以克级数和高对映体纯度制备这种新的官能化甲硅烷基烯醇醚（六步，收率49％）。该试剂用于C-糖基氨基酸的两种合成方法。在一种方法中，由BF（3）.Et（2）O促进的与四-O-苄基-D-吡喃半乳糖基三氯乙酰亚胺酸酯的偶联提供了作为主要产物的α-连接的C-糖苷（分离出的收率为30％）用叔丁基锂转化为β-连接的异构体。通过Barton-McCombie方法对这些化合物进行脱氧，并通过琼斯试剂的氧化裂解从恶唑烷环上脱除糖基部分，从而得到C-糖基丝氨酸等位基因α-和β-Gal-CH（2）（）-Ser。以类似的方式从四-O-苄基-D-吡喃葡萄糖基三氯乙酰亚胺酸酯开始制备α-和β-Glc-CH（2）（）-Ser。在第二种方法中，在BF（
• Synthesis of methylene isosteres of α- and β-d-galactopyranosyl-l-serine
  作者：Alessandro Dondoni、Alberto Marra

  DOI：10.1039/a800571k

  日期：——

  The BF3·Et2O promoted coupling of tetra-O-benzyl-α-D-galactopyranosyl trichloroacetimidate with a silyl enol ether carrying an oxazolidine ring leads to the α-C-glycosylmethyl ketone (32%, 95% ds) that is converted into the title α-C-glycosyl amino acid by carbonyl oxygen removal (Barton–McCombie) and oxidative cleavage (Jones) of the heterocyclic ring, and into the β-isomer by anomerization and the same two-step sequence.

  BF3Â-Et2O 促进了四-O-苄基-δ-D-吡喃半乳糖基三氯乙酰亚胺与带有恶唑烷环的硅基烯醚的偶联，产生了δ-C-糖基甲基酮（32%、95%ds），通过杂环的羰基脱氧（巴顿-麦康比）和氧化裂解（琼斯）将其转化为标题中的δ-C-糖基氨基酸，并通过异构化和相同的两步顺序将其转化为δ-异构体。
• Synthesis of the hexasaccharide from Trypanosoma cruzi mucins with the Galp(1 → 2)Galf unit constructed with a superarmed thiogalactopyranosyl donor
  作者：Gustavo A. Kashiwagi、Carmen R. Cori、Rosa M. de Lederkremer、Carola Gallo-Rodriguez

  DOI：10.1016/j.carres.2019.06.013

  日期：2019.8

  Hexasaccharide beta-D-Galp-(1 -> 2)-[beta-D-Galp-(1 -> 3)]-beta-D-Galp-(1 -> 6)-[beta-D-Galp-(1 -> 2)-beta-D-Galf-(1 -> 4)]-D-GlcNAc (1) was found O-linked in mucins of Trypanosoma cruzi epimastigotes and metacyclic trypomatigotes. Studies on the biological pathways and functionalities of the mucin oligosaccharides are prompted in order to understand the interactions of these molecules with the insect host. Trisaccharide constituent beta-D-Galp-(1 -> 2)-beta-D-Galf-(1 -> 4)-D-GlcNAc was constructed from the reducing to the non-reducing end. We discuss the difficulties to introduce a Galp unit at the O-2 position of a partially protected galactofuranosyl unit which were overcome using an anchimerically superarmed donor. By this route and employing a [3 + 3] nitrilium convergent approach hexasaccharide 1 was synthesized in moderate yield.