methyl 3,4-di-O-benzyl-2-deoxy-α-D-lyxo-hexopyranoside | 494212-11-2

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: methyl 3,4-di-O-benzyl-2-deoxy-α-D-lyxo-hexopyranoside
• 英文别名: methyl 3,4-di-O-benzyl2-deoxy-α-D-liso-hexapyranoside；[(2R,3R,4R,6S)-6-methoxy-3,4-bis(phenylmethoxy)oxan-2-yl]methanol
• CAS: 494212-11-2
• 化学式: C₂₁H₂₆O₅
• 分子量: 358.434
• InChiKey: CABYEFIDFUEUJV-MXEMCNAFSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.4
• 重原子数：
  26
• 可旋转键数：
  8
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.43
• 拓扑面积：
  57.2
• 氢给体数：
  1
• 氢受体数：
  5

反应信息

• 作为反应物：
  描述：

  methyl 3,4-di-O-benzyl-2-deoxy-α-D-lyxo-hexopyranoside 在 sodium hydroxide 、 正丁基锂 、 草酰氯 、 三氟化硼乙醚 、 二甲基亚砜 、 Pd(PPh3)4 作用下， 以 四氢呋喃 、 正己烷 、 二氯甲烷 、 苯 为溶剂， 反应 13.0h， 生成 (1S,6R,7R)-7-(benzyloxy)-10-oxabicyclo[4.3.1]dec-8-en-3-one
  参考文献：
  名称：

  糖底物上的乙缩醛-乙烯基硫醚环化：结构和取代基的影响。

  摘要：

  一系列2-脱氧呋喃糖苷和-吡喃糖苷衍生物被制成带有乙烯基或丙烯基侧链的衍生物。通过与1-溴-1-（苯硫基）乙烯的铃木（Suzuki）交叉偶联反应进行烯烃的延伸，得到硫代烯醇醚作为环化底物。在低于0摄氏度的叔丁基甲基醚中用BF（3）.Et（2）O处理这些底物可诱导环化为光学活性双环醚。如果环化是在甲苯作为溶剂中进行的，则末端硫烯醇醚异构化为内部的硫烯醇醚可以在环化之前进行。空间和电子因素可能会阻碍环化反应。双环醚的开放可以用酮53向环辛烯酮54的碱诱导转化来说明。

  DOI：

  10.1021/jo026163i
• 作为产物：
  描述：

  1,2-dideoxy-3,4-di-O-benzyl-6-O-(tert-butyldimethylsilyl)-D-liso-hex-1-enopyranoside 在 四丁基氟化铵 、 三苯基膦氢溴酸盐 作用下， 以 四氢呋喃 、 二氯甲烷 为溶剂， 生成 methyl 3,4-di-O-benzyl-2-deoxy-α-D-lyxo-hexopyranoside
  参考文献：
  名称：

  Substituent effects on the SmI2/Pd(0)-promoted carbohydrate ring-contraction of 5-alkynylpyranosides

  摘要：

  The effect of substituents on the reactivity and stereoselectivity of the SmI2/Pd(0)-promoted ring-contraction of 5-alkynylpyranosides has been examined using substrates substituted only at selected positions. While formation of 2-ethynylcyclopentanols takes place efficiently, an internal alkyne did not afford the expected product. The presence of peripheral alkoxy substituents leads to variable stereoselectivities that depend on the number and orientation of such groups. Thus, an isolated OBn substituent at C(3) (carbohydrate numbering) exerts a significant stereochemical control while additional substitution with the same group at C(4) either enhances or drastically reduces stereoselectivity depending on its orientation (alpha or beta, respectively). (C) 2003 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/s0040-4020(03)01103-7

文献信息

• Enantioselective Epoxidation of Electrophilic Olefins by Using Glycosyl Hydroperoxides
  作者：Wioletta Kośnik、Wojciech Bocian、Lech Kozerski、Igor Tvaroška、Marek Chmielewski

  DOI：10.1002/chem.200800051

  日期：2008.7.7

  Anomeric hydroperoxides derived from 3,4,6-tri-O-benzyl-galactose and glucose were used for enantioselective epoxidation of naphthoquinone (12), chalcone (13), (E)-1,2-dibenzoyl ethylene (14) and (E)-iso-butyryl-phenyl ethylene (15). In the presence of sodium hydroxide, the epoxidations showed exceptional high asymmetric induction. The exchange of sodium by a potassium ion resulted in a low asymmetric

  衍生自3,4,6-三-O-苄基-半乳糖和葡萄糖的端基氢过氧化物用于萘醌（12），查尔酮（13），（E）-1,2-二苯甲酰基乙烯（14）和（ E）-异丁酰基-苯基乙烯（15）。在氢氧化钠存在下，环氧化显示出异常的高不对称诱导。通过钾离子交换钠导致低的不对称诱导。这些结果指出了抗衡离子的关键作用，并强烈建议在环氧化过程的过渡态中，氢过氧化物和烯烃这两种试剂均会发生碱性离子的配位。DFT B3LYP / 6-31G *水平上反应机理的理论研究与实验结果非常吻合。
• Direct carbohydrate to carbocycle conversions via intramolecular allylation with Et2Zn/Pd(0)
  作者：José M Aurrecoechea、Mónica Arrate、Jesús H Gil、Beatriz López

  DOI：10.1016/s0040-4020(03)00825-1

  日期：2003.7

  Treatment of 5-vinylpyranosides with Et2Zn and catalytic Pd(0), in the presence of ZnCl2, results in the formation of 5-membered carbocyclic products. This carbohydrate ring-contraction features an intramolecular allylation of a ring-opened carbohydrate aldehyde by an in situ-generated nucleophilic allylzinc species. The stereoselectivity about vinyl and free hydroxyl groups at the newly created stereogenic centers varies from low to moderate while both its extent and sense are found to depend on particular structural features (e.g. the configuration of the starting carbohydrate). (C) 2003 Elsevier Science Ltd. All rights reserved.
• Acetal−Vinyl Sulfide Cyclization on Sugar Substrates:  Effect of Structure and Substituent
  作者：Pradip K. Sasmal、Martin E. Maier

  DOI：10.1021/jo026163i

  日期：2003.2.1

  vinyl or propenyl side chain. Extension of the alkene by a Suzuki cross-coupling reaction with 1-bromo-1-(phenylthio)ethene gave thioenol ethers as the cyclization substrates. The treatment of these substrates with BF(3).Et(2)O in tert-butylmethyl ether below 0 degrees C induced cyclization to optically active bicyclic ethers. If the cyclizations are carried out in toluene as the solvent, the isomerization

  一系列2-脱氧呋喃糖苷和-吡喃糖苷衍生物被制成带有乙烯基或丙烯基侧链的衍生物。通过与1-溴-1-（苯硫基）乙烯的铃木（Suzuki）交叉偶联反应进行烯烃的延伸，得到硫代烯醇醚作为环化底物。在低于0摄氏度的叔丁基甲基醚中用BF（3）.Et（2）O处理这些底物可诱导环化为光学活性双环醚。如果环化是在甲苯作为溶剂中进行的，则末端硫烯醇醚异构化为内部的硫烯醇醚可以在环化之前进行。空间和电子因素可能会阻碍环化反应。双环醚的开放可以用酮53向环辛烯酮54的碱诱导转化来说明。
• Substituent effects on the SmI2/Pd(0)-promoted carbohydrate ring-contraction of 5-alkynylpyranosides
  作者：José M. Aurrecoechea、Jesús H. Gil、Beatriz López

  DOI：10.1016/s0040-4020(03)01103-7

  日期：2003.9

  The effect of substituents on the reactivity and stereoselectivity of the SmI2/Pd(0)-promoted ring-contraction of 5-alkynylpyranosides has been examined using substrates substituted only at selected positions. While formation of 2-ethynylcyclopentanols takes place efficiently, an internal alkyne did not afford the expected product. The presence of peripheral alkoxy substituents leads to variable stereoselectivities that depend on the number and orientation of such groups. Thus, an isolated OBn substituent at C(3) (carbohydrate numbering) exerts a significant stereochemical control while additional substitution with the same group at C(4) either enhances or drastically reduces stereoselectivity depending on its orientation (alpha or beta, respectively). (C) 2003 Elsevier Ltd. All rights reserved.