(3aS,4R,6S,7R,7aS)-7-Benzyloxy-6-((2R,3S,4R)-4-benzyloxy-2-benzyloxymethyl-3,4-dihydro-2H-pyran-3-yloxy)-4-triisopropylsilanyloxymethyl-tetrahydro-[1,3]dioxolo[4,5-c]pyran-2-one | 183730-69-0

• 分子结构分类: 有机化合物 - 有机杂环化合物
• 英文名称: (3aS,4R,6S,7R,7aS)-7-Benzyloxy-6-((2R,3S,4R)-4-benzyloxy-2-benzyloxymethyl-3,4-dihydro-2H-pyran-3-yloxy)-4-triisopropylsilanyloxymethyl-tetrahydro-[1,3]dioxolo[4,5-c]pyran-2-one
• CAS: 183730-69-0
• 化学式: C₄₃H₅₆O₁₀Si
• 分子量: 760.997
• InChiKey: PGBHZBSGCZWHOW-PAEYUKOPSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  8.49
• 重原子数：
  54.0
• 可旋转键数：
  18.0
• 环数：
  6.0
• sp3杂化的碳原子比例：
  0.51
• 拓扑面积：
  100.14
• 氢给体数：
  0.0
• 氢受体数：
  10.0

反应信息

• 作为反应物：
  描述：

  (3aS,4R,6S,7R,7aS)-7-Benzyloxy-6-((2R,3S,4R)-4-benzyloxy-2-benzyloxymethyl-3,4-dihydro-2H-pyran-3-yloxy)-4-triisopropylsilanyloxymethyl-tetrahydro-[1,3]dioxolo[4,5-c]pyran-2-one 在 四丁基氟化铵 、 sodium methylate 作用下， 生成 (2R,3R,4S,5R,6S)-5-Benzyloxy-6-((2R,3S,4R)-4-benzyloxy-2-benzyloxymethyl-3,4-dihydro-2H-pyran-3-yloxy)-2-hydroxymethyl-tetrahydro-pyran-3,4-diol
  参考文献：
  名称：

  人类乳腺肿瘤 (Globo-H) 抗原的全合成和结构证明

  摘要：

  Hakomori MBr1 抗原的全合成，在人类乳腺肿瘤上大量表达，是相关的。该构建涉及四种糖基的组装：（17（两次）、18、20 和 26）和 l-岩藻糖衍生物，34。作为状态函数的末端半乳糖环磺酰氨基半乳糖基化立体化学的敏感性在关键步骤中利用其C4醇的保护状态。（参见化合物 51 的形成。）该合成用于确认 Hakomori 结构的分配，并为免疫偶联铺平了道路。（见化合物 64。）

  DOI：

  10.1021/ja962048b
• 作为产物：
  描述：

  溴甲苯 、 (3aS,4R,6S,7R,7aR)-7-hydroxy-6-[[(2R,3S,4R)-4-phenylmethoxy-2-(phenylmethoxymethyl)-3,4-dihydro-2H-pyran-3-yl]oxy]-4-[tri(propan-2-yl)silyloxymethyl]-4,6,7,7a-tetrahydro-3aH-[1,3]dioxolo[4,5-c]pyran-2-one 在 sodium hydride 作用下， 以 N,N-二甲基甲酰胺 为溶剂， 反应 2.08h， 以81%的产率得到(3aS,4R,6S,7R,7aS)-7-Benzyloxy-6-((2R,3S,4R)-4-benzyloxy-2-benzyloxymethyl-3,4-dihydro-2H-pyran-3-yloxy)-4-triisopropylsilanyloxymethyl-tetrahydro-[1,3]dioxolo[4,5-c]pyran-2-one
  参考文献：
  名称：

  人类乳腺肿瘤 (Globo-H) 抗原的全合成和结构证明

  摘要：

  Hakomori MBr1 抗原的全合成，在人类乳腺肿瘤上大量表达，是相关的。该构建涉及四种糖基的组装：（17（两次）、18、20 和 26）和 l-岩藻糖衍生物，34。作为状态函数的末端半乳糖环磺酰氨基半乳糖基化立体化学的敏感性在关键步骤中利用其C4醇的保护状态。（参见化合物 51 的形成。）该合成用于确认 Hakomori 结构的分配，并为免疫偶联铺平了道路。（见化合物 64。）

  DOI：

  10.1021/ja962048b

文献信息

• Synthesis of Asialo GM₁. New Insights in the Application of Sulfonamidoglycosylation in Oligosaccharide Assembly:  Subtle Proximity Effects in the Stereochemical Governance of Glycosidation
  作者：Ohyun Kwon、Samuel J. Danishefsky

  DOI：10.1021/ja9724957

  日期：1998.2.1

  The total synthesis of asialo GM(1) (1a) has been accomplished, Using related chemistry, the methyl glycoside of the asialo compound (1b) has also been synthesized. These kinds of compounds have been identified as potential ligands for bacterial and viral infection sites, A simpler structure, which hits also been identified for its infection attracting structure in the context of glycopeptides and glycolipids (methyl glycoside 2), has also been synthesized. The key common phase in the syntheses involves the sulfonamidoglycosidation reaction which is used to create a beta-linkage leading to a galNAc residue joined to the C-4 hydroxyl group of a galactose unit either as a monosaccharide (see compound 2) or as C-4' in the contest of a lactosyl moiety, During the course of these studies there was encountered an unusual "proximal hydroxyl" directing effect. Thus, when C-4 on the galactose ring of an azaglycosylating donor bears a free hydroxyl (see, for instance, compound 13), beta-glycoside formation predominates. When this hydroxyl group is blocked, the process tends in the direction of alpha-glycoside formation (see compound 32), These findings were explained as arising from a critical intramolecular hydrogen bond between the C-4 axial hydroxyl of the galactose donor and its proximal pyranosidal ring oxygen. This interaction stabilizes conformations from which beta-glycosidation predominates.