β1,4-galactopyranosyl α-xylopyranoside | 14087-31-1

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: β1,4-galactopyranosyl α-xylopyranoside
• 英文别名: O-β-D-galactopyranosyl-(1-4)-α-D-xylopyranose；(2R,3R,4S,5R,6S)-2-(hydroxymethyl)-6-[(3R,4R,5R,6S)-4,5,6-trihydroxyoxan-3-yl]oxyoxane-3,4,5-triol
• CAS: 14087-31-1
• 化学式: C₁₁H₂₀O₁₀
• 分子量: 312.274
• InChiKey: VCTBNHVCBSUQPG-MRRNQDDQSA-N

物化性质

• 熔点：
  160-168 °C(Solv: acetone (67-64-1); water (7732-18-5))
• 沸点：
  659.4±55.0 °C(Predicted)
• 密度：
  1.65±0.1 g/cm3(Predicted)
• 物理描述：
  Solid

计算性质

• 辛醇/水分配系数(LogP)：
  -4.1
• 重原子数：
  21
• 可旋转键数：
  3
• 环数：
  2.0
• sp3杂化的碳原子比例：
  1.0
• 拓扑面积：
  169
• 氢给体数：
  7
• 氢受体数：
  10

反应信息

• 作为产物：
  描述：

  尿苷(5')二氢二磷酰(1)-alpha-D-葡萄糖 生成 β1,4-galactopyranosyl α-xylopyranoside
  参考文献：
  名称：

  Xylose: The First Ambident Acceptor Substrate for Galactosyltransferase from Bovine Milk

  摘要：

  In the past few years the acceptor substrate specificity of beta 1,4-galactosyltransferase (GalT) from bovine milk has been investigated extensively by various groups. In each case, the beta 1,4-galactosylated products have been observed exclusively. Recently we reported on a frame-shifted recognition of modified acceptor substrates resulting in the formation of beta,beta-trehalose type disaccharides. In an extension to these investigations we have now found that xylose is recognized by the enzyme both in the normal and in the reverse orientation. Therefore galactosylation of xylose results in a mixture of beta 1,4- and beta 1,beta 1-galactopyranosyl xylopyranosides. Synthesis and preparation of both disaccharides and their behavior toward beta-galactosidase from E. coli are described. The results lead to some implications about the active site of GalT.

  DOI：

  10.1021/jo00101a038

文献信息

• 4-O-β-spD-Galactopyranosyl-spD-xylose: A new synthesis and application to the evaluation of intestinal lactase
  作者：Alfonso Rivera-Sagredo、Alfonso Fernández-Mayoralas、Jesús Jiménez-Barbero、Manuel Martín-Lomas、Daniel Villanueva、Juan J. Aragón

  DOI：10.1016/s0008-6215(00)90554-8

  日期：1992.4

  benzyl 2,3-O-isopropylidene-beta-D-xylopyranoside by glycosylation with 2,3,4,6-tetra-O-benzoyl-alpha-D-galactopyranosyl bromide and subsequent deprotection. Compound 2 was hydrolyzed in vitro by intestinal lactase; the Vmax was 25% of that with lactose and the Km was 370mM (cf. 27mM for lactose). Oral administration of 2 suckling rats led to urinary excretion of D-xylose which could be estimated colorimetrically

  由苄基2,3-O-异亚丙基-β-D-吡喃吡喃糖苷与2,3,4,6-四-O-苯甲酰基-糖基化制备4-O-β-D-半乳糖吡喃糖基-D-木糖（2）。 α-D-吡喃半乳糖基溴化物和随后的脱保护基。化合物2通过肠乳糖酶在体外水解；Vmax为乳糖的25％，Km为370mM（乳糖为27mM）。口服2只乳鼠导致D-木糖的尿排泄，可通过比色法估算。