| 1374562-21-6

• 分子结构分类: 有机化合物 - 有机氧化合物
• CAS: 1374562-21-6
• 化学式: C₇₂H₇₉BrN₆O₁₆Si
• 分子量: 1392.44
• InChiKey: CZQZXHISIKBKAJ-LMLMTMODSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  11.4
• 重原子数：
  96.0
• 可旋转键数：
  29.0
• 环数：
  10.0
• sp3杂化的碳原子比例：
  0.39
• 拓扑面积：
  271.88
• 氢给体数：
  1.0
• 氢受体数：
  18.0

反应信息

• 作为反应物：
  描述：

  4-methylphenyl 6-O-acetyl-4-O-[2-azido-3-O-(4-bromobenzyl)-6-O-tert-butyldiphenylsilyl-2-deoxy-4-O-(2-naphthylmethyl)-α-D-glucopyranosyl]-2-O-benzoyl-3-O-benzyl-1-thio-β-D-glucopyranoside 、 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 3.0h， 以64%的产率得到methyl [2-azido-3-O-(4-bromobenzyl)-6-O-tert-butyldiphenylsilyl-2-deoxy-4-O-(2-naphthylmethyl)-α-D-glucopyranosyl]-(1->4)-[6-O-acetyl-2-O-benzoyl-3-O-benzyl-β-D-glucopyranosyl]-(1->4)-[2-azido-3-O-(4-bromobenzyl)-6-O-tert-butyldiphenylsilyl-2-deoxy-α-D-glucopyranosyl]-(1->4)-[6-O-acetyl-2-O-benzoyl-3-O-benzyl-β-D-glucopyranosyl]-(1->4)-2-azido-2-deoxy-3,6-di-O-benzyl-α-D-glucopyranoside
  参考文献：
  名称：

  α-Glycosylation by d-Glucosamine-Derived Donors: Synthesis of Heparosan and Heparin Analogues That Interact with Mycobacterial Heparin-Binding Hemagglutinin

  摘要：

  Numerous biomolecules possess alpha-D-glucosamine as structural component. However, chemical glycosylations aimed at this backbone are usually not easily attained without generating the unwanted beta-isomer. We report herein a versatile approach in affording full alpha-stereoselectivity built upon a carefully selected set of orthogonal protecting groups on a D-glucosaminyl donor. The excellent stereoselectivity provided by the protecting group combination was found independent of leaving groups and activators. With the trichloroacetimidate as the optimum donor leaving group, core skeletons of glycosylphosphatidyl inositol anchors, heparosan, heparan sulfate, and heparin were efficiently assembled. The orthogonal protecting groups were successfully manipulated to further carry out the total syntheses of heparosan tri- and pentasaccharides and heparin di-, tetra-, hexa-, and octasaccharide analogues. Using the heparin analogues, heparin-binding hemagglutinin, a virulence factor of Mycobacterium tuberculosis, was found to bind at least six sugar units with the interaction notably being entropically driven.

  DOI：

  10.1021/ja302640p
• 作为产物：
  描述：

  methyl 4-O-[2-azido-3-O-(4-bromobenzyl)-6-O-tert-butyldiphenylsilyl-2-deoxy-4-O-(2-naphthylmethyl)-α-D-glucopyranosyl]-(1->4)-[6-O-acetyl-2-O-benzoyl-3-O-benzyl-β-D-glucopyranosyl]-(1->4)-2-azido-2-deoxy-3,6-di-O-benzyl-α-D-glucopyranoside 在 水 、 2,3-二氯-5,6-二氰基-1,4-苯醌 作用下， 以 二氯甲烷 为溶剂， 反应 2.0h， 以78%的产率得到
  参考文献：
  名称：

  α-Glycosylation by d-Glucosamine-Derived Donors: Synthesis of Heparosan and Heparin Analogues That Interact with Mycobacterial Heparin-Binding Hemagglutinin

  摘要：

  Numerous biomolecules possess alpha-D-glucosamine as structural component. However, chemical glycosylations aimed at this backbone are usually not easily attained without generating the unwanted beta-isomer. We report herein a versatile approach in affording full alpha-stereoselectivity built upon a carefully selected set of orthogonal protecting groups on a D-glucosaminyl donor. The excellent stereoselectivity provided by the protecting group combination was found independent of leaving groups and activators. With the trichloroacetimidate as the optimum donor leaving group, core skeletons of glycosylphosphatidyl inositol anchors, heparosan, heparan sulfate, and heparin were efficiently assembled. The orthogonal protecting groups were successfully manipulated to further carry out the total syntheses of heparosan tri- and pentasaccharides and heparin di-, tetra-, hexa-, and octasaccharide analogues. Using the heparin analogues, heparin-binding hemagglutinin, a virulence factor of Mycobacterium tuberculosis, was found to bind at least six sugar units with the interaction notably being entropically driven.

  DOI：

  10.1021/ja302640p