p-tolyl 5-O-t-butyldiphenylsilyl-1-thio-α-D-arabinofuranoside | 204918-55-8

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: p-tolyl 5-O-t-butyldiphenylsilyl-1-thio-α-D-arabinofuranoside
• 英文别名: p-cresyl 5-O-tert-butyldiphenylsilyl-1-thio-α-D-arabinofuranoside；5-O-tert-butyldiphenylsilyl-1-(4-methylphenylthio)-α-D-Araf；p-tolyl 5-O-tert-butyldiphenylsilyl-1-thio-α-D-arabinofuranoside；(2R,3S,4S,5R)-2-[[tert-butyl(diphenyl)silyl]oxymethyl]-5-(4-methylphenyl)sulfanyloxolane-3,4-diol
• CAS: 204918-55-8
• 化学式: C₂₈H₃₄O₄SSi
• 分子量: 494.727
• InChiKey: IOWZNHJZJPSOEU-JVYGEBFASA-N

物化性质

• 沸点：
  596.8±50.0 °C(Predicted)
• 密度：
  1.20±0.1 g/cm3(Temp: 20 °C; Press: 760 Torr)(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  4.11
• 重原子数：
  34
• 可旋转键数：
  8
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.36
• 拓扑面积：
  84.2
• 氢给体数：
  2
• 氢受体数：
  5

反应信息

• 作为反应物：
  描述：

  p-tolyl 5-O-t-butyldiphenylsilyl-1-thio-α-D-arabinofuranoside 在 四丁基氟化铵 、 sodium hydride 作用下， 以 四氢呋喃 、 N,N-二甲基甲酰胺 为溶剂， 反应 2.0h， 生成 2,3-di-O-benzyl-1-(p-tolylthio)-1-deoxy-α-D-arabinofuranoside
  参考文献：
  名称：

  Stereoselective Synthesis of a Fragment of Mycobacterial Arabinan

  摘要：

  Strategies for the stereoselective synthesis of mycobacterial arabinan were explored. Arabinofuranosyl donors with various protective groups were screened in terms of suitability for beta-( 1,2- cis)- selective glycosylation. The protective group was found to affect the stereoselectivity of arabinofuranosylation. beta-Selectivity was drastically enhanced by using donors protected with 3,5- TIDPS, possibly due to conformational constraints on the furanose ring. Synthesis of heptaarabinofuranoside was then performed to demonstrate the practicality of this methodology.

  DOI：

  10.1021/ol062198j
• 作为产物：
  描述：

  1-(p-thiocresyl)-2,3,5-tri-O-acetyl-α-D-arabinofuranoside 在 吡啶 、 甲醇 、 sodium methylate 作用下， 生成 p-tolyl 5-O-t-butyldiphenylsilyl-1-thio-α-D-arabinofuranoside
  参考文献：
  名称：

  Synthetic arabinofuranosyl oligosaccharides as Mycobacterial arabinosyltransferase substrates

  摘要：

  A series of arabinofuranosyl oligosaccharides found as constituent parts of the polysaccharide portion of the cell wall of Mycobacterium tuberculosis have been chemically synthesized. Screening of these oligosaccharides as substrates for arabinosyltransferases present in mycobacterial membrane preparations suggests that modified oligosaccharide analogs as small as disaccharides may be inhibitors of glycan biosynthesis. Such inhibitors would be of potential utility as lead compounds in the identification of new drugs for the treatment of mycobacterial infections. (C) 1998 Elsevier Science Ltd. All rights reserved.

  DOI：

  10.1016/s0960-894x(98)00049-3

文献信息

• Preparation of the tri-arabino di-mycolate fragment of mycobacterial arabinogalactan from defined synthetic mycolic acids
  作者：Mohsin O. Mohammed、Juma'a R. Al Dulayymi、Mark S. Baird

  DOI：10.1016/j.carres.2016.11.006

  日期：2017.1

  An efficient synthetic approach to tri-arabino di-mycolates, using structurally defined synthetic alpha-, keto and methoxy mycolic acids is described.

  描述了一种有效的合成方法，使用结构上定义的合成α-，酮和甲氧基霉菌酸合成三阿拉伯糖基二霉菌酸酯。
• Neighboring-Group Participation by C-2 Ether Functions in Glycosylations Directed by Nitrile Solvents
  作者：Chin-Sheng Chao、Ching-Yu Lin、Shaheen Mulani、Wei-Cheng Hung、Kwok-kong Tony Mong

  DOI：10.1002/chem.201100732

  日期：2011.10.17

  Ether‐protecting functions at C‐2 hydroxy groups have been found to play participating roles in glycosylations when the reactions are conducted in nitrile solvent mixtures. The participation mechanism is based on intramolecular interaction between the lone electron pair of the oxygen atom of the C‐2 ether function and the nitrile molecule when they are positioned in a cis configuration. A 1,2‐cis glycosyl

  当在腈溶剂混合物中进行反应时，已发现在C-2羟基处的醚保护功能在糖基化中起参与作用。参与机制基于C-2醚功能的氧原子的孤电子对和腈分子以顺式排列时的分子内相互作用。形成一个1,2-顺式糖基恶唑啉鎓中间体。这种参与，再加上糖基供体的异头作用，赋予糖基化较高的1,2-反式选择性。该概念的进一步应用导致了α-（1→5）-阿拉伯低聚物的高效制备。
• β-Selective xylulofuranosylation <i>via</i> a conformationally-restricted glycosyl donor
  作者：Bo-Shun Huang、Todd L. Lowary

  DOI：10.1039/d0ob00260g

  日期：——

  Reported is the first stereoselective method for β-xylulofuranosylation, which employs 3,4-O-xylylene-protected thioglycoside donors.

  报道了第一种β-木糖呋喃糖基选择性方法，该方法使用3,4-O-二甲苯基保护的硫代糖苷供体。
• Sensitivity of ¹<i>J</i>_C1_-_H1 Magnitudes to Anomeric Stereochemistry in 2,3-Anhydro-<i>O</i>-furanosides
  作者：Christopher S. Callam、Rajendrakumar Reddy Gadikota、Todd L. Lowary

  DOI：10.1021/jo001747a

  日期：2001.6.1

  3-anhydro-S-glycosides, the size of the (1)J[C(1)-H(1)] is not sensitive to C(1) stereochemistry. Computational studies on all four methyl 2,3-anhydro-O-furanosides (5-8) demonstrated that (1)J[C(1)-H(1)] was inversely proportional to the length of the C(1)-H(1) bond. A previously reported equation, which relates C(1)-H(1) bond distance and atomic charges to (1)J[C(1)-H(1)] magnitudes, could be used to accurately

  在C，（1）和H（1）之间的2，3-脱水-O-呋喃糖苷之间的单键耦合常数的大小已显示对异头中心的立体化学敏感。研究了一组由24种化合物组成的化合物，如果将异头氢反式转化为环氧化物部分，则（1）J [C（1）-H（1）] = 163-168 Hz；而当氢为环氧乙烷环的顺式时，（（（1）J [C（1）-H（1）] = 171-174 Hz）。相反，对于2,3-脱水-S-糖苷， （1）J [C（1）-H（1）]对C（1）立体化学不敏感。对所有四种甲基2,3-脱水-O-呋喃糖苷（5-8）的计算研究表明（1 ）J [C（1）-H（1）]与C（1）-H（1）键的长度成反比。以前报道的方程式涉及C（1）-H（1）的键距和原子电荷到（1）J [C（1）-H（1）]量级，可用于准确预测α-lyxo（5）和beta-ribo（8）异构体的J值。相反，对于β-lyxo（6）和α-ribo异构体（7），该方程式将这些耦合常数的大小低估了10-20
• Arabinofuranosyl Oligosaccharides from Mycobacteria:  Synthesis and Effect of Glycosylation on Ring Conformation and Hydroxymethyl Group Rotamer Populations
  作者：Francis W. D'Souza、Joseph D. Ayers、Patrick R. McCarren、Todd L. Lowary

  DOI：10.1021/ja993543l

  日期：2000.2.1

  A series of alpha-D-arabinofurnnosyl oligosaccharides (2-8) that an fragments of the arabinan portions of two polysaccharides present in the cell wall of Mycobacterium tuberculosis have been synthesized. Preparation of the oligosaccharides involved the sequential addition of arabinofuranosyl residues from thioglycoside donors to methyl glycoside accepters. High-resolution NMR studies on the final products provided all (3)J(H,H) values, which were in turn used in PSEUROT 6.2 calculations to determine both the identity and equilibrium populations of preferred conformers for each furanose ring in these glycans. Comparison of the ring conformers present in 2-8 with these available in the parent monosaccharide, methyl alpha-D-arabinofuranose (16), allowed the determination of the effect of glycosylation upon ring conformation. At equilibrium, 16 exists as an approximately equimolar mixture of T-0(4) (North, N) and T-2(3) (South, S) conformers. These studies showed that glycosylation of 16 at OH5 resulted in no significant change in conformer identity or population relative to 16. However, glycosylation of OH3 resulted in a change in the identity of the N species (to E-O) and a significant favoring of this conformer at equilibrium. These trends were seen in all of the oligosaccharides. The populations of the three possible staggered rotamers (gg, gt, tg) about the C4-C5 bond were essentially the same for all residues in 2-8, and thus this equilibrium does not appear to be sensitive to glycosylation.