methyl 2-acetamido-4,6-di-O-acetyl-2,3-N,O-carbonyl-2-deoxy-β-D-glucopyranosyl-(1-6)-2,3,4-tri-O-benzyl-β-D-galactopyranoside | 1057668-85-5

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: methyl 2-acetamido-4,6-di-O-acetyl-2,3-N,O-carbonyl-2-deoxy-β-D-glucopyranosyl-(1-6)-2,3,4-tri-O-benzyl-β-D-galactopyranoside
• CAS: 1057668-85-5
• 化学式: C₄₁H₄₇NO₁₄
• 分子量: 777.822
• InChiKey: QOOJMPSBEZRSSF-QCISSENZSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  4.09
• 重原子数：
  56.0
• 可旋转键数：
  16.0
• 环数：
  6.0
• sp3杂化的碳原子比例：
  0.46
• 拓扑面积：
  163.82
• 氢给体数：
  0.0
• 氢受体数：
  14.0

反应信息

• 作为产物：
  描述：

  methyl 2,3,4-tri-O-benzyl-β-D-galactopyranoside 、 ethyl 2-acetamido-4,6-di-O-acetyl-2,3-N,O-carbonyl-2-deoxy-1-thio-β-D-glucopyranoside 在 N-碘代丁二酰亚胺 、 silver trifluoroacetate 作用下， 以 二氯甲烷 为溶剂， 以76%的产率得到methyl 2-acetamido-4,6-di-O-acetyl-2,3-N,O-carbonyl-2-deoxy-β-D-glucopyranosyl-(1-6)-2,3,4-tri-O-benzyl-β-D-galactopyranoside
  参考文献：
  名称：

  Investigations of Glycosylation Reactions with 2-N-Acetyl-2N,3O-oxazolidinone-Protected Glucosamine Donors

  摘要：

  NIS/AgOTf-promoted glycosylations with ethyl 2,3-N,O-carbonyl-2-deoxy-1-thio-beta-D-glueopyranoside donors can be performed with either alpha- or beta-selectivity by tuning the reaction conditions. Small amounts of AgOTf (0.1 equiv) and short reaction times give beta-selectivity, whereas 0.4 equiv of AgOTf and prolonged reaction times afford alpha-linked products. NMR-monitored glycosylation and anomerization experiments show initial formation of exclusively the beta-linkage, which anomerizes, through an intramolecular mechanism involving an endocyclic C - O bond cleavage, to the alpha-linkage.

  DOI：

  10.1021/jo800971s