methyl O-(2,4-di-O-benzoyl-3-O-bromoacetyl-α-L-rhamnopyranosyl)-(1->3)-2,4-di-O-benzoyl-α-L-rhamnopyranoside | 142967-76-8

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: methyl O-(2,4-di-O-benzoyl-3-O-bromoacetyl-α-L-rhamnopyranosyl)-(1->3)-2,4-di-O-benzoyl-α-L-rhamnopyranoside
• 英文别名: methyl O-(2,4-di-O-benzoyl-3-O-bromoacetyl-α-L-rhanopyranosyl)-(1-3)-2,4-di-O-benzoyl-α-L-rhamnopyranoside
• CAS: 142967-76-8
• 化学式: C₄₃H₄₁BrO₁₄
• 分子量: 861.694
• InChiKey: HOTKEEQLNBBPSO-ZYNLEWMVSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  5.72
• 重原子数：
  58.0
• 可旋转键数：
  13.0
• 环数：
  6.0
• sp3杂化的碳原子比例：
  0.33
• 拓扑面积：
  168.42
• 氢给体数：
  0.0
• 氢受体数：
  14.0

反应信息

• 作为反应物：
  描述：

  methyl O-(2,4-di-O-benzoyl-3-O-bromoacetyl-α-L-rhamnopyranosyl)-(1->3)-2,4-di-O-benzoyl-α-L-rhamnopyranoside 在 硫脲 作用下， 以 甲醇 、 二氯甲烷 为溶剂， 反应 0.5h， 以100%的产率得到methyl 2,4-di-O-benzoyl-α-L-rhamnopyranosyl-(1->3)-2,4-di-O-benzoyl-α-L-rhamnopyranoside
  参考文献：
  名称：

  Stereoselective syntheses of a di-, tri-, and tetra-saccharide fragment of shigella dysenteriae type 1 O-antigen using 3,4,6-tri-O-acetyl-2-azido-2-deoxy-α-d-glucopyranosyl chloride as a glycosyl donor

  摘要：

  Methyl 2,4-di-O-benzoyl-alpha-L-rhamnopyranoside (1) furnished a crystalline 3-0-bromoacetyl derivative that was treated with the dichloromethyl methyl ether-ZnCl2 reagent to give 2,4-di-O-benzoyl-3-O-bromoacetyl-alpha-L-rhamnopyranosyl chloride (3). Compounds 1 and 3 were condensed under the conditions of base-deficient, silver trifluoromethanesulfonate-mediated glycosylation to give a fully protected rhamnobioside, which on O-debromoacetylation afforded the disaccharide nucleophile 10. Similar condensation of 3 with methyl 3-O-benzoyl-4,6-O-benzylidene-alpha-D-galactopyranoside, followed by O-debromoacetylation and condensation of the thus formed methyl O-(2,4-di-O-benzoyl-alpha-L-rhamopyranosyl)-(1 --> 2)-4,6-O-benzylidene-3-O-benzoyl-alpha-D-galactopyranoside again with 3, gave the trisaccharide glycoside. Subsequent O-debromoacetylation gave 17, having only HO-3(3) unsubstituted. Silver perchlorate-mediated glycosylations of 1, 10, and 17 with 3.4.6-tri-O-acetyl-2-azido-2-deoxy-alpha-D-glucopyranosyl chloride afforded, with high alpha stereoselectivity, protected di-, tri-, and tetra-saccharide glycosides. Subsequent hydrogenation, followed by N-acetylation and O-deacylation, afforded three oligosaccharide glycosides having nonreducing terminal 2-acetamido-2-deoxy-alpha-D-glucopyranosyl residues and comprising successively larger portions of the repeating unit of Shigella dysenteriae type 1 O-antigen.

  DOI：

  10.1016/s0008-6215(00)90483-x
• 作为产物：
  描述：

  methyl 2,4-di-O-benzoyl-3-O-bromoacetyl-α-L-rhamnopyranoside 在 2,4,6-三甲基吡啶 、 silver trifluoromethanesulfonate 、 zinc(II) chloride 作用下， 以 二氯甲烷 为溶剂， 反应 7.0h， 生成 methyl O-(2,4-di-O-benzoyl-3-O-bromoacetyl-α-L-rhamnopyranosyl)-(1->3)-2,4-di-O-benzoyl-α-L-rhamnopyranoside
  参考文献：
  名称：

  Stereoselective syntheses of a di-, tri-, and tetra-saccharide fragment of shigella dysenteriae type 1 O-antigen using 3,4,6-tri-O-acetyl-2-azido-2-deoxy-α-d-glucopyranosyl chloride as a glycosyl donor

  摘要：

  Methyl 2,4-di-O-benzoyl-alpha-L-rhamnopyranoside (1) furnished a crystalline 3-0-bromoacetyl derivative that was treated with the dichloromethyl methyl ether-ZnCl2 reagent to give 2,4-di-O-benzoyl-3-O-bromoacetyl-alpha-L-rhamnopyranosyl chloride (3). Compounds 1 and 3 were condensed under the conditions of base-deficient, silver trifluoromethanesulfonate-mediated glycosylation to give a fully protected rhamnobioside, which on O-debromoacetylation afforded the disaccharide nucleophile 10. Similar condensation of 3 with methyl 3-O-benzoyl-4,6-O-benzylidene-alpha-D-galactopyranoside, followed by O-debromoacetylation and condensation of the thus formed methyl O-(2,4-di-O-benzoyl-alpha-L-rhamopyranosyl)-(1 --> 2)-4,6-O-benzylidene-3-O-benzoyl-alpha-D-galactopyranoside again with 3, gave the trisaccharide glycoside. Subsequent O-debromoacetylation gave 17, having only HO-3(3) unsubstituted. Silver perchlorate-mediated glycosylations of 1, 10, and 17 with 3.4.6-tri-O-acetyl-2-azido-2-deoxy-alpha-D-glucopyranosyl chloride afforded, with high alpha stereoselectivity, protected di-, tri-, and tetra-saccharide glycosides. Subsequent hydrogenation, followed by N-acetylation and O-deacylation, afforded three oligosaccharide glycosides having nonreducing terminal 2-acetamido-2-deoxy-alpha-D-glucopyranosyl residues and comprising successively larger portions of the repeating unit of Shigella dysenteriae type 1 O-antigen.

  DOI：

  10.1016/s0008-6215(00)90483-x

文献信息

• Di- and tri-saccharide glycosyl donors for the synthesis of fragments of the O-specific antigen of Shigella dysenteriae type 1
  作者：Pavol Kováč

  DOI：10.1016/0008-6215(93)80073-n

  日期：1993.7

  Methyl O-(2,4-di-O-benzoyl-3-O-bromoacetyl-alpha-L-rhamnopyranosyl)-(1-->3)- 2,4-di-O-benzoyl-alpha-L-rhamnopyranoside was treated with dichloromethyl methyl ether and ZnCl2 to give O-(2,4-di-O-benzoyl-3-O-bromoacetyl-alpha-L-rhamnopyranosyl)-(1-->3)2,4- di-O- benzoyl-alpha-L-rhamnopyranosyl chloride. Similar treatment of methyl O-(3,4,6-tri-O-acetyl-2-azido-2-deoxy-alpha-D- glucopyranosyl)-(1-->3)-2

  甲基O-（2,4-二-O-苯甲酰基-3-O-溴乙酰基-α-L-鼠李吡喃糖基）-（1-> 3）-2,4-二-O-苯甲酰基-α-L-鼠李糖吡喃糖苷用二氯甲基甲基醚和ZnCl2处理得到O-（2,4-二-O-苯甲酰基-3-O-溴乙酰基-α-L-鼠李糖基）-（1-> 3）2,4-二-O -苯甲酰基-α-L-鼠李糖基氯。甲基O-（3,4,6-三-O-乙酰基-2-叠氮基-2-脱氧-α-D-吡喃葡萄糖基）-（1-> 3）-2,4-二-O-的相似处理苯甲酰基-α-L-鼠李吡喃糖苷（13）得到结晶O-（3,4,6-tir-O-乙酰基-2-叠氮基-2-脱氧-α-D-吡喃葡萄糖基）-（1-> 3）- 2,4-二-O-苯甲酰基-α-L-鼠李糖基氯（14），也通过处理甲基O-（3,4,6-三-O-乙酰基-2-叠氮基-2-脱氧基而获得-α-D-吡喃葡萄糖基）-（1→3）-2,4-二-O-苯甲酰基-1-硫代α-L-鼠李吡喃糖苷（12）与氯。与转换12->