methyl 2-O-pivaloyl-α-D-mannopyranoside

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: methyl 2-O-pivaloyl-α-D-mannopyranoside
• 英文别名: [(2S,3S,4S,5S,6R)-4,5-dihydroxy-6-(hydroxymethyl)-2-methoxyoxan-3-yl] 2,2-dimethylpropanoate
• 化学式: C₁₂H₂₂O₇
• 分子量: 278.302
• InChiKey: QZGDBGBWVTXKOT-ZJDVBMNYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -0.1
• 重原子数：
  19
• 可旋转键数：
  5
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.92
• 拓扑面积：
  105
• 氢给体数：
  3
• 氢受体数：
  7

反应信息

• 作为产物：
  描述：

  甲基-D-丙噻 在 native rabbit serum 作用下， 以 吡啶 、 二甲基亚砜 为溶剂， 反应 48.83h， 生成 methyl 2-O-pivaloyl-α-D-mannopyranoside
  参考文献：
  名称：

  Synthesis, intramolecular migrations and enzymic hydrolysis of partially pivaloylated methyl α-d-mannopyranosides

  摘要：

  A series of methyl O-pivaloyl-alpha-D-mannopyranosides was synthesized using pivaloyl chloride in pyridine. The 3,6-di-O-pivaloyl derivative 6 undergoes intramolecular transesterification in neutral conditions (buffer, pH 7.2) to give its 2,6-di-O-pivaloyl analogue 5. The course of this migration was followed using C-14-labelled 6. As opposed to 6 compound 5 was shown to be a good substrate for esterases present in rabbit serum. Thus, regioselective enzymic hydrolysis led to the preferential cleavage of the 2-OPiv group to yield a mixture of 2- and 6-O-monopivalates in a ratio of 1:2.6. (C) 2003 Elsevier Science Ltd. All rights reserved.

  DOI：

  10.1016/s0008-6215(02)00501-3

文献信息

• Highly Regioselective Monoacylation of Unprotected Glucopyranoside Using Transient Directing-Protecting Groups
  作者：Sylvain Rocheleau、Joshua Pottel、Igor Huskić、Nicolas Moitessier

  DOI：10.1002/ejoc.201601457

  日期：2017.1.18

  Regioselective functionalization of monosaccharides is notoriously achieved using metal catalysis, lengthy protec-tion/deprotection-requiring synthetic strategies, various enzymes, or other methods that target cis-diols—all of which preclude their use with glucose derivatives. We report herein a new methodology using selected boronic acids as temporary protecting groups and describe its application

  众所周知，单糖的区域选择性功能化是通过金属催化、需要长时间保护/脱保护的合成策略、各种酶或其他靶向顺式二醇的方法实现的——所有这些都排除了它们与葡萄糖衍生物的使用。我们在此报告了一种使用选定的硼酸作为临时保护基团的新方法，并描述了其在甲基 α-D-吡喃葡萄糖苷的区域选择性官能化中的应用，吡喃葡萄糖苷是最难区域选择性官能化的。通常，吡喃葡萄糖苷的反应可能导致过多的单和多官能化衍生物，但我们的方法提供了甲基 α-D 的 3-O-乙酰化、2-O-苯甲酰化和 2-O-新戊酰化异构体-吡喃葡萄糖苷为主要产品。重点是使用可回收的绿色临时保护基团（在一锅反应中）和使用专门选择的芳基硼酸调节分子内氢键网络。提出了一个完整的可扩展程序，从未受保护的甲基 α-D-吡喃葡萄糖苷产生单一区域异构体。
• Acyl Group Migration in Pyranosides as Studied by Experimental and Computational Methods
  作者：Robert Lassfolk、Manuel Pedrón、Tomás Tejero、Pedro Merino、Johan Wärnå、Reko Leino

  DOI：10.1002/chem.202200499

  日期：2022.6.15

  have studied the acyl migration in different monosaccharides using five different acyl groups by a combination of experimental, kinetic and theoretical tools. The results show that the anomeric configuration in the monosaccharide has a major influence on the migration rate, together with the relative configurations of the other hydroxyl groups and the nature of the migrating acyl group. Full mechanistic

  酰基迁移影响所有含有游离羟基的酰化有机化合物，特别是碳水化合物的合成、分离、操作和纯化。虽然已经报道了一些关于不同缓冲液中迁移现象的孤立研究，但缺乏对类似条件下不同单糖整体迁移过程的全面了解。在这里，我们结合实验、动力学和理论工具，使用五种不同的酰基研究了不同单糖中的酰基迁移。结果表明，单糖中的异头构型与其他羟基的相对构型和迁移酰基的性质一起对迁移速率有重大影响。全机械模型，基于计算，
• Synthesis, intramolecular migrations and enzymic hydrolysis of partially pivaloylated methyl α-d-mannopyranosides
  作者：Srđanka Tomić、Vesna Petrović、Maja Matanović

  DOI：10.1016/s0008-6215(02)00501-3

  日期：2003.3

  A series of methyl O-pivaloyl-alpha-D-mannopyranosides was synthesized using pivaloyl chloride in pyridine. The 3,6-di-O-pivaloyl derivative 6 undergoes intramolecular transesterification in neutral conditions (buffer, pH 7.2) to give its 2,6-di-O-pivaloyl analogue 5. The course of this migration was followed using C-14-labelled 6. As opposed to 6 compound 5 was shown to be a good substrate for esterases present in rabbit serum. Thus, regioselective enzymic hydrolysis led to the preferential cleavage of the 2-OPiv group to yield a mixture of 2- and 6-O-monopivalates in a ratio of 1:2.6. (C) 2003 Elsevier Science Ltd. All rights reserved.