methyl 2-O-benzyl-4,6-O-benzylidene-β-D-glucopyranoside | 130192-76-6

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 吡喃二恶英
• 英文名称: methyl 2-O-benzyl-4,6-O-benzylidene-β-D-glucopyranoside
• 英文别名: (2R,4aR,6R,7R,8S,8aS)-6-methoxy-2-phenyl-7-phenylmethoxy-4,4a,6,7,8,8a-hexahydropyrano[3,2-d][1,3]dioxin-8-ol
• CAS: 130192-76-6
• 化学式: C₂₁H₂₄O₆
• 分子量: 372.418
• InChiKey: FYUXMZUFURHCOX-KXXIFBCNSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.9
• 重原子数：
  27
• 可旋转键数：
  5
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.43
• 拓扑面积：
  66.4
• 氢给体数：
  1
• 氢受体数：
  6

反应信息

• 作为反应物：
  描述：

  methyl 2-O-benzyl-4,6-O-benzylidene-β-D-glucopyranoside 在 silver trifluoromethanesulfonate 、 三氯化铁 作用下， 以 二氯甲烷 、 甲苯 为溶剂， 反应 0.5h， 生成 methyl 3-O-(2,3,4,6-tetrakis-O-(p-bromobenzoyl)-β-D-glucopyranosyl)-β-D-glucopyranoside
  参考文献：
  名称：

  Hydroxymethyl Rotamer Populations in Disaccharides

  摘要：

  Sixteen methyl glucopyranosyl glucopyranoside disaccharides (methyl beta-D-Glcp(p-Br-Bz)-(1-->alpha)-beta/alpha-D-Glcp) containing beta-glycosidic linkages (1-->2, 1-->3, 1-->4, and 1-->6) were synthesized and analyzed by means of CD and NMR spectroscopy in three different solvents. For each of these four types of disaccharides, a correlation was observed between the hydroxymethyl rotational populations around the C5-C6 bond of the glucopyranosyl residue II with the substituents and the anomeric configuration of the methoxyl group in residue I, as well as with the solvent. Nonbonded interactions, the stereoelectronic exo-anomeric effect, and hydrogen bonding were found to be responsible for the observed rotameric differences. Whereas the rotational populations of the (1-->6)-linked disaccharides are mainly dependent on the exo-anomeric effect, the (1-->2)-bonded disaccharides are strongly dependent on the anomeric configuration at C1, and the (1-->3)- and (1-->4)-linked disaccharides are mainly dependent on the substituents and the solvent. The population of the gt rotamer decreases as nonbonded interactions increase but increases as the exo-anomeric effect becomes greater, as well as in the presence of intramolecular hydrogen bonding to the endocyclic oxygen O5'. Comparison of the hydroxymethyl rotational preferences between our model disaccharides revealed a dependence on the glycosidic linkage type. Thus the population of the gg and gt rotamers decreases/increases from (1-->2)-(beta series), to (1-->6)-, to (1-->2)-(alpha series), to (1-->4)-, and to (1-->3)-bonded disaccharides respectively, while the tg rotamer population remains almost constant (around 20%), except for the (1-->3)- and (1-->4)-linked disaccharides with the intramolecular hydrogen bonding to O5', where this population decreases to 10%.

  DOI：

  10.1021/jo026913o
• 作为产物：
  描述：

  甲基 Β-D-吡喃葡萄糖苷 在 camphor-10-sulfonic acid 、 四丁基硫酸氢铵 、 sodium hydroxide 作用下， 以 二氯甲烷 、 水 、 乙腈 为溶剂， 反应 72.33h， 生成 methyl 2-O-benzyl-4,6-O-benzylidene-β-D-glucopyranoside
  参考文献：
  名称：

  部分保护的吡喃糖苷的羟基酸度

  摘要：

  已经进行了碳水化合物羟基的综合酸度研究。对于部分甲基化的甲基 α-D-吡喃糖苷，通过分光光度法测定相对酸度 (Ke)。显然，酸度受分子内氢键以及立体化学和溶剂化的强烈影响。通过与脂肪醇和多元醇的 pKe 和 pKa 值进行比较，获得了部分保护的吡喃糖苷的 pKa 值的首次估计值。这些发现有助于理解碳水化合物羟基的相对反应性。

  DOI：

  10.1002/ejoc.201101708

文献信息

• An Iron(III) Catalyst with Unusually Broad Substrate Scope in Regioselective Alkylation of Diols and Polyols
  作者：Bo Ren、Olof Ramström、Qiang Zhang、Jiantao Ge、Hai Dong

  DOI：10.1002/chem.201504477

  日期：2016.2.12

  mechanism is proposed to proceed via a cyclic dioxolane‐type intermediate, formed between the iron(III) species and two adjacent hydroxyl groups. This approach represents the first transition‐metal catalysts that are able to replace stoichiometric amounts of organotin reagents in regioselective alkylation. The reactions generally lead to very high regioselectivities and high yields, on par with, or better

  在这项研究中，[Fe（dibm）3 ]（dibm = diisobutyrylmethane）被证明具有广泛的适用范围，可作为选择性地对包含1,2-和1,3--二醇的各种结构进行选择性单烷基化的催化剂。建议通过在铁（III）物种和两个相邻羟基之间形成的环状二氧戊环型中间体进行该机理的研究。这种方法代表了第一种能够在区域选择性烷基化反应中取代化学计量的有机锡试剂的过渡金属催化剂。该反应通常导致非常高的区域选择性和高产率，与先前用于区域选择性烷基化的方法相当或更好。
• Matching Glycosyl Donor Reactivity to Sulfonate Leaving Group Ability Permits S_N2 Glycosylations
  作者：Ming-Hua Zhuo、David J. Wilbur、Eugene E. Kwan、Clay S. Bennett

  DOI：10.1021/jacs.9b07022

  日期：2019.10.23

  Here we demonstrate that highly β-selective glycosylation reactions can be achieved when the electronics of a sulfonyl chloride activator and the reactivity of a glycosyl donor hemiacetal are matched. While these reactions are compatible with the acid- and base-sensitive protecting groups that are commonly used in oligosaccharide synthesis, these protecting groups are not relied upon to control selectivity

  在这里，我们证明了当磺酰氯活化剂的电子学和糖基供体半缩醛的反应性匹配时，可以实现高度 β 选择性的糖基化反应。虽然这些反应与寡糖合成中常用的酸和碱敏感保护基团相容，但不依赖于这些保护基团来控制选择性。相反，β-选择性源于 α-糖基芳基磺酸盐在类似 SN2 的机制中的立体转化。我们的机械建议得到了 NMR 研究、动力学同位素效应 (KIE) 测量和 DFT 计算的支持。
• Non-Glycosidically Linked Pseudodisaccharides: Thioethers, Sulfoxides, Sulfones, Ethers, Selenoethers, and Their Binding to Lectins
  作者：Ian Cumpstey、Clinton Ramstadius、Tashfeen Akhtar、Irwin J. Goldstein、Harry C. Winter

  DOI：10.1002/ejoc.200901481

  日期：2010.4

  Hydrolytically stable non-glycosidically linked tail-to-tail pseudodisaccharides are linked by a single bridging atom remote from the anomeric centre of the constituent monosaccharides. Some such pseudodisaccharides with sulfur or oxygen bridges were found to act as disaccharide mimetics in their binding to the Banana Lectin and to Concanavalin A. A versatile synthetic route to a small library of such

  水解稳定的非糖苷连接的尾对尾假二糖通过远离组成单糖的异头中心的单个桥原子连接。发现一些具有硫桥或氧桥的此类假二糖在与香蕉凝集素和刀豆球蛋白 A 结合时充当二糖模拟物。描述了一种合成此类化合物的小型文库的通用途径。
• Pre-activation protocol leading to highly stereoselectivity-controllable glycosylations of oxazolidinone protected glucosamines
  作者：Yiqun Geng、Li-He Zhang、Xin-Shan Ye

  DOI：10.1039/b712591g

  日期：——

  Under pre-activation glycosylation conditions, the 4,6-di-O-acetyl-N-acetyloxazolidinone protected donor afforded either excellent β- or α-stereoselectivity simply by means of the addition of hindered base TTBP or the absence of base, leading to the controllable stereochemistry of coupling reactions.

  在预活化糖基化条件下，4,6-二-O-乙酰基-N-乙酰基噁唑烷酮保护的供体通过添加障碍基碱TTBP或不添加碱，获得了优异的β-或α-立体选择性，从而实现了偶联反应的可控立体化学。
• Organotin-catalyzed regioselective benzylation of carbohydrate trans-diols
  作者：Hengfu Xu、Ying Zhang、Hai Dong、Yuchao Lu、Yuxin Pei、Zhichao Pei

  DOI：10.1016/j.tetlet.2017.08.043

  日期：2017.10

  approach to regioselective benzylation of carbohydrate trans-diols was developed, where 0.1 equiv. of Bu2SnCl2 and 0.1 equiv. of TBABr were used as the catalysts and 2.0 equiv. of BnCl was used as the benzylation reagent. In most cases, similar or better benzylation regioselectivities and isolated yields were obtained by using catalytic amounts of Bu2SnCl2, rather than stoichiometric amounts of organotin

  开发了一种方便的方法，用于碳水化合物反式二醇的区域选择性苄化，其中0.1当量。的Bu 2 SnCl 2和0.1当量 使用TBABr 2的催化剂作为催化剂，当量为2.0当量。将BnCl 2用作苄基化试剂。在大多数情况下，通过使用催化量的Bu 2 SnCl 2而不是所需化学计量的有机锡试剂，可获得相似或更好的苄基化区域选择性和分离的产率。