(2S,4aR,6S,7R,8S,8aS)-7-(allyloxy)-8-(benzyloxy)-6-(((2R,3R,4S,5R,6S)-4,5-bis(benzyloxy)-2-((benzyloxy)methyl)-6-(phenylthio)tetrahydro-2H-pyran-3-yl)oxy)-2-phenylhexahydropyrano[3,2-d][1,3]dioxine | 1079324-07-4

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: (2S,4aR,6S,7R,8S,8aS)-7-(allyloxy)-8-(benzyloxy)-6-(((2R,3R,4S,5R,6S)-4,5-bis(benzyloxy)-2-((benzyloxy)methyl)-6-(phenylthio)tetrahydro-2H-pyran-3-yl)oxy)-2-phenylhexahydropyrano[3,2-d][1,3]dioxine
• CAS: 1079324-07-4
• 化学式: C₅₆H₅₈O₁₀S
• 分子量: 923.137
• InChiKey: REYJKOYYSDMKNO-FCIXPQHESA-N

计算性质

• 辛醇/水分配系数(LogP)：
  10.27
• 重原子数：
  67.0
• 可旋转键数：
  21.0
• 环数：
  9.0
• sp3杂化的碳原子比例：
  0.32
• 拓扑面积：
  92.3
• 氢给体数：
  0.0
• 氢受体数：
  11.0

反应信息

• 作为反应物：
  描述：

  (2R,3R,4S,5S,6S)-2-[(4-methoxyphenyl)methoxy]-6-methyl-4,5-bis(phenylmethoxy)oxan-3-ol 、 (2S,4aR,6S,7R,8S,8aS)-7-(allyloxy)-8-(benzyloxy)-6-(((2R,3R,4S,5R,6S)-4,5-bis(benzyloxy)-2-((benzyloxy)methyl)-6-(phenylthio)tetrahydro-2H-pyran-3-yl)oxy)-2-phenylhexahydropyrano[3,2-d][1,3]dioxine 在 三氟甲烷磺酸甲酯 作用下， 以 乙醚 、 二氯甲烷 为溶剂， 以50%的产率得到p-methoxybenzyl (2-O-allyl-3-O-benzyl-4,6-O-benzylidene-β-D-galactopyranosyl)-(1->4)-(2,3,6-tri-O-benzyl-α-D-glucopyranosyl)-(1->2)-3,4-di-O-benzyl-α-L-rhamnopyranoside
  参考文献：
  名称：

  A new route for the synthesis of Streptococcus pneumoniae 19F and 19A capsular polysaccharide fragments avoiding the β-mannosamine glycosylation step

  摘要：

  The recently described [Attolino, E.; Bonaccorsi, F.: Catelani, G.; D'Andrea, F. Carbohydr. Res. 2008, 343, 2545-2556.] beta-D-MaNAcp-(1 -> 4)-beta-D-Glcp thiophenyl glycosyl donor 3 was used in alpha-glycosylation reactions of OH-2 and OH-3 of the suitably protected p-MeO-benzyl alpha-L-rhamnopyranoside acceptors 7 and 8. Glycosylation of the axial OH-2 of 7 took place in high yield (76%) and with acceptable stereoselectivity (alpha/beta = 3.4) leading to the protected trisaccharide alpha-11, corresponding to the repeating unit of Streptococcus pneumoniae 19F. The same reaction on equatorial OH-3 of acceptor 8 gave the trisaccharide alpha-15, a constituent of the repeating unit of S. pneumoniae 19A, but in lower yield (41%) and without stereoselection (alpha/beta = 1:1.3). Utilizing the introduced orthogonal protection of OH-1 and OH-4 '', the trisaccharide alpha-11 was transformed into a trisaccharide building block suitable for the synthesis of its phosphorylated oligomers. (C) 2009 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.carres.2009.04.012