methyl O-(2,3,4,6-tetra-O-acetyl-α-D-glucopyranosyl)-(1->4)-2,3,6-tri-O-acetyl-α-D-galactopyranoside | 241471-05-6

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: methyl O-(2,3,4,6-tetra-O-acetyl-α-D-glucopyranosyl)-(1->4)-2,3,6-tri-O-acetyl-α-D-galactopyranoside
• 英文别名: methyl 2,3,6-tri-O-acetyl-4-O-(2,3,4,6-tetra-O-acetyl-α-D-glucopyranosyl)-α-D-galactopyranoside；Glc2Ac3Ac4Ac6Ac(a1-4)a-Gal1Me2Ac3Ac6Ac；[(2R,3S,4S,5R,6S)-4,5-diacetyloxy-6-methoxy-3-[(2R,3R,4S,5R,6R)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxyoxan-2-yl]methyl acetate
• CAS: 241471-05-6
• 化学式: C₂₇H₃₈O₁₈
• 分子量: 650.588
• InChiKey: NWTWYNIVYAQTJI-YMRDTZBBSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -0.7
• 重原子数：
  45
• 可旋转键数：
  19
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.74
• 拓扑面积：
  221
• 氢给体数：
  0
• 氢受体数：
  18

反应信息

• 作为反应物：
  描述：

  methyl O-(2,3,4,6-tetra-O-acetyl-α-D-glucopyranosyl)-(1->4)-2,3,6-tri-O-acetyl-α-D-galactopyranoside 在 硫酸 、 sodium methylate 作用下， 以 甲醇 为溶剂， 反应 7.0h， 生成 4-O-α-D-glucopyranosyl-D-galactopyranose
  参考文献：
  名称：

  The synthesis of 2-, 3-, 4- and 6-O-α-d-glucopyranosyl-d-galactopyranose, and their evaluation as nutritional supplements for pre-term infants

  摘要：

  Four methods have been screened for the synthesis of some alpha-D-glucopyrano sides, with the recently reported (Mukaiyama) combination of 2,3,4,6-tetra-O-benzyl- alpha-D-glucopyranosyl iodide and triphenylphosphine oxide being the most successful, especially in the diastereoselectivity exhibited. The alpha-D-glueopyranosides so obtained have been deprotected to yield 2-, 3-, 4- and 6-O-alpha-D-glucopyranosyl-D-galactopyranose. Only the last disaccharide showed any hydrolysis by alpha-glycosidases but this success was not emulated by mucosal extracts from the small intestine of the pig. (c) 2007 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.carres.2007.04.022
• 作为产物：
  描述：

  乙酸酐 、 methyl 3,6'-O-(4,6-diphenyl-1,3-xylylene)-(2,3,4-O-tri-benzyl-α-D-glucopyranosyl)-(1'->4)-2,6-di-O-benzyl-α-D-galactopyranoside 在 palladium on activated charcoal 甲酸 、 氢气 、 吡啶 作用下， 以 甲醇 、 乙酸乙酯 为溶剂， 反应 40.0h， 生成 methyl O-(2,3,4,6-tetra-O-acetyl-α-D-glucopyranosyl)-(1->4)-2,3,6-tri-O-acetyl-α-D-galactopyranoside
  参考文献：
  名称：

  Efficient Intramolecular Glycosylation Supported by a Rigid Spacer

  摘要：

  The m-xylylene moiety was employed as rigid spacer in intramolecular glycoside bond formation. Fifteen-membered macrocycle formation starting from 6-O-linked donor and 6- and 4-O-linked acceptor (5a,b, 6b) led exclusively to beta(1-4)- and beta(1-6)-linked compounds 7 beta and 8 beta, respectively, which gave cellobioside and gentiobioside derivatives. The glycosylation yields could be improved by 14-membered macrocycle formation. In the four cases studied, the donor was 6-O-linked to the spacer. For the acceptor linkage to the spacer and the accepting hydroxy group, relative D-/L-threo- and D-/L-erythro-arrangements were chosen. Standard glycosylation conditions led in three cases (13, 14, 23) only to beta-linkage in high yield (16 beta, 17 beta, 25 beta). For the transformation of 24, having a D-erythro-arrangement in the acceptor moiety, the alpha-anomer 26 alpha was preferentially obtained. Limitation of the conformational space of the donor and the acceptor as in 31, which is stereochemically identical with 24, led to the corresponding alpha-glycoside 32 alpha in 87% yield. Synthesis of a pseudo mirror image of 23 [having 6-(D)/3-(D-threo)-arrangement], namely 35, having 3(L)/6-(L-threo)-arrangement of the donor and acceptor moieties, expectedly gave only alpha-glycoside 36 alpha in very high yield. Thus, the efficiency and versatility of this conceptual approach to intramolecular glycoside bond formation is exhibited.

  DOI：

  10.1021/jo990132e