ethyl 2,6-di-O-benzyl-1-thio-β-D-galactopyranoside | 215371-44-1

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: ethyl 2,6-di-O-benzyl-1-thio-β-D-galactopyranoside
• 英文别名: (2R,3R,4S,5R,6S)-6-ethylsulfanyl-5-phenylmethoxy-2-(phenylmethoxymethyl)oxane-3,4-diol
• CAS: 215371-44-1
• 化学式: C₂₂H₂₈O₅S
• 分子量: 404.527
• InChiKey: BDHZUKWOVBQDTJ-CTWRKMMKSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.6
• 重原子数：
  28
• 可旋转键数：
  9
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.45
• 拓扑面积：
  93.4
• 氢给体数：
  2
• 氢受体数：
  6

反应信息

• 作为反应物：
  描述：

  ethyl 2,6-di-O-benzyl-1-thio-β-D-galactopyranoside 在 吡啶 、 lithium aluminium tetrahydride 、 三氯化铝 、 对甲苯磺酸 作用下， 以 乙醚 、 二氯甲烷 为溶剂， 反应 2.43h， 生成 ethyl 3-O-acetyl-2,4,6-tri-O-benzyl-1-thio-β-D-galactopyranoside
  参考文献：
  名称：

  Synthesis of Fragments of the Glycocalyx Glycan of the ParasiteSchistosoma mansoni

  摘要：

  The chemical synthesis of alpha-L-Fucp-(1 --> 3)-beta-D-GalpNAc-(1 --> 4)-beta-D-GlcpNAc-(1 --> 3)-alpha-D-GalpO(CH2)(5)NH2, beta-D-GalpNAc-(1 --> 4)-[alpha-L-Fucp-(1 --> 3)-]beta-D-GlcpNAc-(1 --> 3)-alpha-D-GalpO(CH2)(5)NH2, and alpha-L-Fucp-(1 --> 3)-beta-D-GalpNAc-(1 --> 4)- [alpha-L-Fucp-(1 --> 3)-]beta-D-GlcpNAc-(1 --> 3)-alpha-D-GalpO(CH2)(5)NH2 is described. These structures represent fucosylated oligosaccharide fragments of the glycocalyx glycan of the cercarial stage of the parasite Schistosoma mansoni, and in protein-conjugated form they are potential diagnostics in the search for antibodies raised against the glycan in the serum of infected humans.

  DOI：

  10.1002/1521-3765(20020104)8:1<151::aid-chem151>3.0.co;2-c
• 作为产物：
  描述：

  (2R,3S,4S,5R,6S)-3,4-Bis-allyloxy-5-benzyloxy-2-benzyloxymethyl-6-ethylsulfanyl-tetrahydro-pyran 在 四(三苯基膦)钯 aminomethyl resin-supported N-propylbarbituric acid 作用下， 以 四氢呋喃 为溶剂， 反应 24.0h， 以80%的产率得到ethyl 2,6-di-O-benzyl-1-thio-β-D-galactopyranoside
  参考文献：
  名称：

  在钯催化下使用固体负载的巴比妥酸轻松去除烯丙基和烯丙氧基羰基保护基团的策略

  摘要：

  固体负载的巴比妥酸可用于钯（0）催化的烯丙胺、氨基甲酸酯、碳酸酯、酯和醚的脱保护。这种固体支持的试剂有利于脱保护化合物的分离和纯化。尤其是酸和胺。

  DOI：

  10.1055/s-2003-39907

文献信息

• Facile and Selective Cleavageof Allyl Ethers Based on Palladium(0)-Catalyzed Allylic Alkylationof<i>N</i>,<i>N</i>′-DimethylbarbituricAcid
  作者：Hirokazu Tsukamoto、Yoshinori Kondo

  DOI：10.1055/s-2003-39320

  日期：——

  The classical palladium(0)-catalyzed allylic alkylation of N,N'-dimethylbarbituric acid can be applied to the facile and selective cleavage of allylic alkyl ethers to release the corresponding alcohols in excellent yield.This reaction proceeds under neutral conditions without any additive to activate the allyl ethers and tolerates various functional groups, such as ester, ether, ketone, alkyl and aryl

  N,N'-二甲基巴比妥酸的经典钯 (0) 催化烯丙基烷基化可用于烯丙基烷基醚的轻松和选择性裂解，以优异的产率释放相应的醇。 该反应在中性条件下进行，无需任何添加剂活化烯丙基醚并耐受各种官能团，如酯、醚、酮、烷基和芳基氯、腈和硝基。
• Stereocontrolled α-Galactosylation under Cooperative Catalysis
  作者：Melanie Shadrick、Yashapal Singh、Alexei V. Demchenko

  DOI：10.1021/acs.joc.0c01279

  日期：2020.12.18

  A recent discovery of a cooperative catalysis comprising a silver salt and an acid led to a dramatic improvement in the way glycosyl halides are glycosidated. Excellent yields have been achieved, but the stereoselectivity achieved with 2-O-benzylated donors was poor. Reported herein is our first attempt to refine the stereoselectivity of the cooperatively catalyzed galactosylation reaction. Careful

  最近发现的包含银盐和酸的协同催化导致糖基卤化物糖苷化方式的显着改进。已经实现了极好的产率，但是用 2- O-苄基化供体实现的立体选择性很差。本文报道的是我们首次尝试改进协同催化的半乳糖基化反应的立体选择性。仔细优化反应条件以及研究远程保护基团的作用，对具有不同保护的半乳糖基供体的各种糖基受体的 α-半乳糖基化进行了出色的立体控制。
• Synthesis of a hexasaccharide corresponding to a porcine zona pellucida fragment that inhibits porcine sperm-oocyte interaction in vitro
  作者：Nynke M. Spijker、Cor A. Keuning、Mariska Hooglugt、Gerrit H. Veeneman、Constant A.A. van Boeckel

  DOI：10.1016/0040-4020(96)00225-6

  日期：1996.4

  The synthesis of hexasaccharide1, [Galβ(1-4)GlcNAc[6OSO3]β(1-3)Galβ(1-4)GlcNAcβ(1-3)Galβ(1-3)GalNAcα-O(CH2)3NH2], which corresponds to a porcine zona pellucida fragment that inhibits porcine sperm-oocyte interaction, is described. Compound1 was obtained from fully protected hexasaccharide2, which was in turn constructed from protected Galβ(1-3)GalNAc disaccharide5, containing an α-linked 3-azidopropyl

  六糖1，[Galβ（1-4）GlcNAc [6OSO 3 ]β（1-3）Galβ（1-4）GlcNAcβ（1-3）Galβ（1-3）GalNAcα-O（CH 2）3的合成描述了NH 2 ]，其对应于抑制猪精子-卵母细胞相互作用的猪透明带片段。化合物1是从完全保护的六糖2中获得的，而六糖2依次由保护的Galβ（1-3）GalNAc二糖5（包含一个与α连接的3-叠氮丙基间隔基）以及乳糖胺衍生物3和4构成。通过将硒代苯基糖苷偶联制备二糖3和46具有含有异头硫代乙基的糖基受体。NIS / TfOH促进了二糖4与5的偶联，得到29，通过选择性除去乙酰丙酰基将其转化为四糖受体30。用3的30进行糖基化，得到保护的六糖2。去除邻苯二甲酰亚胺基，乙酰化，然后选择性去除烯丙基和硫酸化，最后完全脱保护，得到六糖1。
• The presence of water improves reductive openings of benzylidene acetals with trimethylaminoborane and aluminium chloride
  作者：Andrei A. Sherman、Yuri V. Mironov、Olga N. Yudina、Nikolay E. Nifantiev

  DOI：10.1016/s0008-6215(03)00015-6

  日期：2003.4

  efficient for the reductive openings of the cyclic benzylidene acetals with Me(3)N x BH(3) in tetrahydrofurane than the AlCl(3) alone. Under proposed conditions, the dioxane-type 4,6-O-bezylidene acetals of hexopyranosides give regioselectively the corresponding 4-hydroxy,6-O-benzyl derivatives in excellent yields. Reductive openings of the dioxolane-type 3,4-O-benzylidene acetals of galactopyranoside are

  由无水AlCl（3）和H（2）O以3：1比例原位形成的酸性试剂比四氢呋喃中Me（3）N x BH（3）还原环亚苄基乙缩醛的效率高得多单独的AlCl（3）。在提出的条件下，己吡喃糖苷的二恶烷型4，6-O-亚苄基乙缩醛以优异的产率选择性地给出相应的4-羟基，6-O-苄基衍生物。半乳糖吡喃糖苷的二氧戊环型3,4-O-亚苄基乙缩醛的还原开口也非常有效且具有区域选择性，可生成3-O-苄基衍生物（来自3,4-O-外亚苄基乙缩醛）或4-O-苄基衍生物（来自3,4-O-内-亚苄基缩醛）取决于缩醛碳原子的构型。
• Superbase-Catalyzed Stereo- and Regioselective Glycosylation with 2-Nitroglycals: Facile Access to 2-Amino-2-deoxy-<i>O</i>-glycosides
  作者：Kumar Bhaskar Pal、Aoxin Guo、Mrinmoy Das、Gábor Báti、Xue-Wei Liu

  DOI：10.1021/acscatal.0c00753

  日期：2020.6.19

  An efficient superbase-catalyzed stereo- and regioselective glycosylation of 2-nitroglycals with high functional group compatibility is reported. The ion pair generated from alcohol and a catalytic amount of P-4-t-Bu was vital for the successful implementation of this stereoselective glycosylation under mild conditions, producing moderate to good yields. Under reported reaction conditions, 2-nitrogalactals produce alpha-stereoisomers exclusively, while 2-nitroglucal yielded more beta-products. The notable difference between the outcomes was investigated by the density functional theory (DFT) study. In addition, we have synthesized the key intermediate of a mucin-type core-6 glycoconjugate, thus illustrating the synthetic potency of this method.