methyl 2,3,4,6-tetra-O-benzyl-α-D-glucopyranosyl-(1→6)-2,3,4-tri-O-benzyl-α-D-mannopyranoside | 206186-96-1

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: methyl 2,3,4,6-tetra-O-benzyl-α-D-glucopyranosyl-(1→6)-2,3,4-tri-O-benzyl-α-D-mannopyranoside
• CAS: 206186-96-1
• 化学式: C₆₂H₆₆O₁₁
• 分子量: 987.199
• InChiKey: FLOIPOSVHDNCRB-UTOSJGNCSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  10.83
• 重原子数：
  73.0
• 可旋转键数：
  26.0
• 环数：
  9.0
• sp3杂化的碳原子比例：
  0.32
• 拓扑面积：
  101.53
• 氢给体数：
  0.0
• 氢受体数：
  11.0

反应信息

• 作为产物：
  描述：

  2,3,4,6-四苄基-D-吡喃葡萄糖 在 4-二甲氨基吡啶 、 gold(III) chloride 、 N,N'-二环己基碳二亚胺 作用下， 以 二氯甲烷 为溶剂， 反应 2.0h， 生成 methyl 2,3,4,6-tetra-O-benzyl-β-D-glucopyranosyl-(1→6)-2,3,4-tri-O-benzyl-α-D-mannopyranoside 、 methyl 2,3,4,6-tetra-O-benzyl-α-D-glucopyranosyl-(1→6)-2,3,4-tri-O-benzyl-α-D-mannopyranoside
  参考文献：
  名称：

  金（III）催化的使用苯丙丙酸酯糖苷的糖基化：苯丙酸，一个易于分离和可重复使用的离开基团

  摘要：

  使用新合成的台式稳定苯丙酸苯丙酯糖基（PPG）供体，开发了一种有效且操作简单的金（III）催化的糖基化方案。金（III）催化的PPG活化与各种基于碳水化合物和非碳水化合物的糖基受体进行得很好，并导致其相应的O / N-糖苷的收率好至极好，并具有可重复使用和易于分离的苯丙酸的再生。差异保护的PPG在优化的反应条件下反应良好。特别地，在甘露糖基和鼠李糖基PPG供体上观察到良好的异头选择性。初步的机理研究表明，与酯基相邻的三键的存在对于激活至关重要，并且基于PPG的供体显示出比类似的乙酸和苯甲酸酯供体更高的反应性。

  DOI：

  10.1021/acs.joc.8b02422

文献信息

• Tris(pentafluorophenyl)borane-Promoted Stereoselective Glycosylation with Glycosyl Trichloroacetimidates under Mild Conditions
  作者：Kunj Bihari Mishra、Adesh Kumar Singh、Jeyakumar Kandasamy

  DOI：10.1021/acs.joc.8b00215

  日期：2018.4.6

  Tris(pentafluorophenyl)borane-promoted stereoselective glycosylation with trichloroacetimidate glycosyl donors is described. The reactions proceed efficiently with a wide range of acceptors, from sugar to nonsugar, under mild conditions in the presence of a catalytic amount of B(C6F5)3. The perbenzylated glucosyl α-imidate provides β-selective glycosides in 70–92% yields.

  描述了用三氯乙酰亚胺酸酯糖基供体的三（五氟苯基）硼烷促进的立体选择性糖基化。在催化量的B（C 6 F 5）3存在下，在温和条件下，反应可利用各种受体（从糖到非糖）有效地进行。过苄基化的葡萄糖基α-亚氨酸酯以70-92％的产率提供β-选择性糖苷。
• Thioperoxide-Mediated Activation of Thioglycoside Donors
  作者：Hongwen He、Xiangming Zhu

  DOI：10.1021/ol501211z

  日期：2014.6.6

  trimethylsilyl trifluoromethanesulfonate (TMSOTf) provides a powerful thiophilic promoter system, capable of activating different thioglycosides. Both armed and disarmed thioglycosides were activated effectively in the presence of different glycosyl acceptors, giving glycosidation products in high to excellent yields. A plausible activation pathway was also proposed and supported by isolating side-products

  硫过氧化物（1）与三甲基甲硅烷基三氟甲磺酸盐（TMSOTf）结合提供了强大的亲硫促进剂体系，能够活化不同的硫糖苷。在存在不同的糖基受体的情况下，武装和解除武装的硫代糖苷都被有效地激活，从而以高到极好的收率得到糖苷化产物。还提出了一条可行的活化途径，并通过分离副产物三氟甲基苯基二硫化物（CF 3 SSPh）和烯烃（42）予以支持。
• Directing effect by remote electron-withdrawing protecting groups at O-3 or O-4 position of donors in glucosylations and galactosylations
  作者：Ju Yuel Baek、Hea-Won Kwon、Se Jin Myung、Jung Jun Park、Mi Young Kim、Dominea C.K. Rathwell、Heung Bae Jeon、Peter H. Seeberger、Kwan Soo Kim

  DOI：10.1016/j.tet.2015.06.014

  日期：2015.8

  Glucosylations and galactosylations of various acceptors with donors possessing an electronwithdrawing benzylsulfonyl, benzoyl, or acetyl group at the O-3 or O-4 position were performed. A beta-directing effect by the benzylsulfonyl group at O-3 of the glucosyl donors and by the benzylsulfonyl and acyl groups at O-4 of the glucosyl donors was observed. In contrast, acyl groups at O-3 of the glucosyl donors and acyl groups at O-3 and O-4 of the galactosyl donors exhibited an alpha-directing effect. The alpha-directing effect is partly considered to remote participation of the acyl groups, whereas the beta-directing effect is somewhat attributed to the S(N)2-like reaction of the acceptor with the glycosyl triflate or the contact ion pair, which is stabilized by remote electron-withdrawing groups. Further evidence for the stability of the alpha-glycosyl triflates was determined by a low-temperature NMR study. (C) 2015 Elsevier Ltd. All rights reserved.