methyl (cyclohexyl 5-acetamido-7,8,9-tri-O-acetyl-5-N,4-O-carbonyl-3,5-dideoxy-D-glycero-α-D-galacto-non-2-ulopyranoside)onate | 1590365-50-6

• 分子结构分类: 有机化合物 - 有机酸及其衍生物 - 羧酸及其衍生物
• 英文名称: methyl (cyclohexyl 5-acetamido-7,8,9-tri-O-acetyl-5-N,4-O-carbonyl-3,5-dideoxy-D-glycero-α-D-galacto-non-2-ulopyranoside)onate
• CAS: 1590365-50-6
• 化学式: C₂₅H₃₅NO₁₃
• 分子量: 557.552
• InChiKey: NVUDUJPPXCXIFD-TUTCKEIYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.16
• 重原子数：
  39.0
• 可旋转键数：
  9.0
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.76
• 拓扑面积：
  170.27
• 氢给体数：
  0.0
• 氢受体数：
  13.0

反应信息

• 作为产物：
  描述：

  methyl S-4-methylphenyl 5-acetamido-4,7,8,9-tetra-O-acetyl-3,5-dideoxy-2-thio-D-glycero-α-D-galacto-2-nonulopyranosidonate 在 吡啶 、 N-碘代丁二酰亚胺 、 甲烷磺酸 、 乙酸酐 、 碳酸氢钠 、 N,N-二异丙基乙胺 作用下， 以 甲醇 、 二氯甲烷 、 水 、 乙腈 为溶剂， 反应 1.5h， 生成 methyl (cyclohexyl 5-acetamido-7,8,9-tri-O-acetyl-5-N,4-O-carbonyl-3,5-dideoxy-D-glycero-α-D-galacto-non-2-ulopyranoside)onate
  参考文献：
  名称：

  Comparative studies on the O-sialylation with four different α/β-oriented (N-acetyl)-5-N,4-O-carbonyl-protected p-toluenethiosialosides as donors

  摘要：

  Four types of 5-N,4-O-carbonyl-protected p-toluenethiosialosides were synthesized and their couplings with different acceptors were thoroughly investigated. The results indicate that the sialyl donor structure, the amount of glycosyl acceptor, and the detailed promotion conditions have great influence on the sialylation stereoselectivties and product yields. Under the (p-Tol)(2)SO/Tf2O activation conditions, the glycosylations with simple alcohols provided declined alpha-selectivities and higher yields with increasing the amounts of acceptors from 1.1 equiv to 2.0 equiv. However, the outcome of same sialylation was independent of the relative amounts of sugar alcohol acceptors. With NIS/TfOH as promoter, the alpha-selectivities of the sialylations were significantly improved compared with the cases activated by (p-Tol)(2)SO/Tf2O. In general, the difference in configuration of N-acetylated sialyl donors (D2 and D4) has little effect on the sialylation yield and stereoselectivity. In contrast, the N-deacetylated alpha/beta sialyl donors (D1 and D3) show complex sialylation profiles with different acceptors. (C) 2014 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.carres.2014.02.006