methyl 3-O-benzoyl-4,5:7,8-di-O-isopropylidene-α,β-D-glycero-D-talo-2-octulopyranosonate

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: methyl 3-O-benzoyl-4,5:7,8-di-O-isopropylidene-α,β-D-glycero-D-talo-2-octulopyranosonate
• 英文别名: methyl (3aS,4R,7S,7aS)-7-benzoyloxy-4-[(4R)-2,2-dimethyl-1,3-dioxolan-4-yl]-6-hydroxy-2,2-dimethyl-3a,4,7,7a-tetrahydro-[1,3]dioxolo[4,5-c]pyran-6-carboxylate
• 化学式: C₂₂H₂₈O₁₀
• 分子量: 452.458
• InChiKey: MTKUSANNGZTDMR-BJUMGEMPSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.3
• 重原子数：
  32
• 可旋转键数：
  6
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.64
• 拓扑面积：
  119
• 氢给体数：
  1
• 氢受体数：
  10

反应信息

• 作为反应物：
  描述：

  methyl 3-O-benzoyl-4,5:7,8-di-O-isopropylidene-α,β-D-glycero-D-talo-2-octulopyranosonate 在 吡啶 、 三氟甲磺酸三甲基硅酯 、 sodium methylate 、 N,N-二异丙基乙胺 作用下， 以 甲醇 、 二氯甲烷 、 乙腈 为溶剂， 反应 52.0h， 生成 methyl O-(methyl 4,5:7,8-di-O-isopropylidene-3-O-thiobenzoyl-α-D-glycero-D-talo-2-octulopyranosonate)-(2->6)-2,3,4-tri-O-benzyl-α-D-glucopyranoside
  参考文献：
  名称：

  Synthesis of 3-deoxy-d-manno-2-octulosonic acid (Kdo) and d-glycero-d-talo-2-octulosonic acid (Ko) and their α-glycosides

  摘要：

  Reaction of 2,3:5,6-di-O-isopropylidene-D-mannofuranose 1 with C-2 lithio derivatives of glyoxylate mercaptal in the presence of MgBr2 afforded D-glycero-D-galacto-2-octulosonates 2 and 3, respectively. Their 3-O-deoxygenation led to Kdo. N-Iodosuccinimide treatment of 3 gave thioglycoside 11 directly, which was transformed into Ko derivative 12 via epimerisation of the 3-hydroxy group. 3-O-Benzoylation of 12 and then transformation into phosphite furnished 15, an efficient glycosyl donor. Reaction of 15 with 6-O-unprotected glucosamine derivative 22 as acceptor gave alpha-glycoside 23, which was successfully transformed either into Kdo-disaccharide 27 or into Ko-disaccharide 29. (C) 2000 Elsevier Science Ltd. All rights reserved.

  DOI：

  10.1016/s0957-4166(99)00557-1