octyl 2,3,4,6-tetra-O-acetyl-α-D-mannopyranosyl-(1→4)-2,3-di-O-acetyl-α-D-glucopyranosiduronic acid | 1421868-80-5

• 分子结构分类: 有机化合物 - 脂质和类脂质分子 - 脂肪酰基
• 英文名称: octyl 2,3,4,6-tetra-O-acetyl-α-D-mannopyranosyl-(1→4)-2,3-di-O-acetyl-α-D-glucopyranosiduronic acid
• 英文别名: Man2Ac3Ac4Ac6Ac(a1-4)GlcA2Ac3Ac(a)-O-octyl；(2S,3S,4S,5R,6S)-4,5-diacetyloxy-6-octoxy-3-[(2R,3S,4S,5R,6R)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxyoxane-2-carboxylic acid
• CAS: 1421868-80-5
• 化学式: C₃₂H₄₈O₁₈
• 分子量: 720.722
• InChiKey: YZYHHYAPYPNXCO-FMTYQUKPSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.4
• 重原子数：
  50
• 可旋转键数：
  24
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.78
• 拓扑面积：
  232
• 氢给体数：
  1
• 氢受体数：
  18

反应信息

• 作为反应物：
  描述：

  octyl 2,3,4,6-tetra-O-acetyl-α-D-mannopyranosyl-(1→4)-2,3-di-O-acetyl-α-D-glucopyranosiduronic acid 在 sodium methylate 作用下， 以 甲醇 为溶剂， 反应 4.0h， 以65%的产率得到octyl α-D-mannopyranosyl-(1→4)-α-D-glucopyranosiduronic acid
  参考文献：
  名称：

  Synthesis, Structural Elucidation, And Biochemical Analysis of Immunoactive Glucuronosyl Diacylglycerides of Mycobacteria and Corynebacteria

  摘要：

  Glucuronosyl diacylglycerides (GlcAGroAc(2)) are functionally important glycolipids and membrane anchors for cell wall lipoglycans in the Corynebacteria. Here we describe the complete synthesis of distinct acyl-isoforms of GlcAGroAc(2) bearing both acylation patterns of (R)-tuberculostearic acid (C-19:0) and palmitic acid (C-16:0) and their mass spectral characterization. Collision-induced fragmentation mass spectrometry identified characteristic fragment ions that were used to develop "rules" allowing the assignment of the acylation pattern as C-19:0 (sn-1), C-16:0 (sn-2) in the natural product from Mycobacterium smegmatis, and the structural assignment of related C-18:1 (sn-1), C-16:0 (sn-2) GlcAGroAc(2) glycolipids from M. smegmatis and Corynebacterium glutamicum. A synthetic hydrophobic octyl glucuronoside was used to characterize the GDP-mannose-dependent mannosyltransferase MgtA from C. g/utamicum that extends GlcAGroAc(2). This enzyme is an Mg2+/Mn2+-dependent metalloenzyme that undergoes dramatic activation upon reduction with dithiothreitol.

  DOI：

  10.1021/jo302508e
• 作为产物：
  描述：

  正辛基 α-D-葡萄糖苷 在 三乙基硅烷 、 2,2,6,6-tetramethyl-piperidine-N-oxyl 、 三氟甲磺酸三甲基硅酯 、 碘苯二乙酸 、 20% palladium hydroxide-activated charcoal 、 氢气 、 对甲苯磺酸 、 三氟乙酸 作用下， 以 吡啶 、 乙醇 、 二氯甲烷 、 氯仿 、 水 、 乙酸乙酯 为溶剂， 反应 10.33h， 生成 octyl 2,3,4,6-tetra-O-acetyl-α-D-mannopyranosyl-(1→4)-2,3-di-O-acetyl-α-D-glucopyranosiduronic acid
  参考文献：
  名称：

  Synthesis, Structural Elucidation, And Biochemical Analysis of Immunoactive Glucuronosyl Diacylglycerides of Mycobacteria and Corynebacteria

  摘要：

  Glucuronosyl diacylglycerides (GlcAGroAc(2)) are functionally important glycolipids and membrane anchors for cell wall lipoglycans in the Corynebacteria. Here we describe the complete synthesis of distinct acyl-isoforms of GlcAGroAc(2) bearing both acylation patterns of (R)-tuberculostearic acid (C-19:0) and palmitic acid (C-16:0) and their mass spectral characterization. Collision-induced fragmentation mass spectrometry identified characteristic fragment ions that were used to develop "rules" allowing the assignment of the acylation pattern as C-19:0 (sn-1), C-16:0 (sn-2) in the natural product from Mycobacterium smegmatis, and the structural assignment of related C-18:1 (sn-1), C-16:0 (sn-2) GlcAGroAc(2) glycolipids from M. smegmatis and Corynebacterium glutamicum. A synthetic hydrophobic octyl glucuronoside was used to characterize the GDP-mannose-dependent mannosyltransferase MgtA from C. g/utamicum that extends GlcAGroAc(2). This enzyme is an Mg2+/Mn2+-dependent metalloenzyme that undergoes dramatic activation upon reduction with dithiothreitol.

  DOI：

  10.1021/jo302508e