ethyl 2,4-di-O-benzyl-3-O-(2-pyridinecarbonyl)-1-thio-β-L-rhamnopyranoside | 1415590-63-4

• 分子结构分类: 有机化合物 - 苯类化合物 - 苯和取代衍生物
• 英文名称: ethyl 2,4-di-O-benzyl-3-O-(2-pyridinecarbonyl)-1-thio-β-L-rhamnopyranoside
• 英文别名: ethyl 2,4-di-O-benzyl-3-O-picoloyl-1-thio-β-L-rhamnopyranoside
• CAS: 1415590-63-4
• 化学式: C₂₈H₃₁NO₅S
• 分子量: 493.624
• InChiKey: ZUYRGCPTZPZJGF-DHXRDMNESA-N

计算性质

• 辛醇/水分配系数(LogP)：
  5.28
• 重原子数：
  35.0
• 可旋转键数：
  10.0
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.36
• 拓扑面积：
  66.88
• 氢给体数：
  0.0
• 氢受体数：
  7.0

反应信息

• 作为反应物：
  描述：

  甲基2,3,4-三-O-苄基-α-D-吡喃葡萄糖苷 、 ethyl 2,4-di-O-benzyl-3-O-(2-pyridinecarbonyl)-1-thio-β-L-rhamnopyranoside 在 DMTST 作用下， 以 1,2-二氯乙烷 为溶剂， 反应 2.0h， 以94%的产率得到methyl 2,3,4-tri-O-benzyl-6-O-(2,4-di-O-benzyl-3-O-picoloyl-β-L-rhamnopyranosyl)-α-D-glucopyranoside
  参考文献：
  名称：

  Effect of Remote Picolinyl and Picoloyl Substituents on the Stereoselectivity of Chemical Glycosylation

  摘要：

  O-Picolinyl and O-picoloyl groups at remote positions (C-3, C-4, and C-6) can mediate glycosylation reactions by providing high or even complete facial selectivity for the attack of the glycosyl acceptor. The set of data presented herein offers a strong evidence of the intermolecular H-bond tethering between the glycosyl donor and glycosyl acceptor counterparts while providing a practical new methodology for the synthesis of either 1,2-cis or 1,2-trans linkages. Challenging glycosidic linkages including alpha-gluco, beta-manno, and beta-rhamno have seen obtained with high or complete stereocontrol.

  DOI：

  10.1021/ja307355n
• 作为产物：
  描述：

  ethyl 2,3-O-isopropylidene-1-thio-β-L-rhamnopyranoside 在 2,6-二甲基吡啶 、 4-二甲氨基吡啶 、 四丁基氟化铵 、 sodium hydride 、 N,N'-二环己基碳二亚胺 、 三氟乙酸 作用下， 以 四氢呋喃 、 二氯甲烷 、 水 、 N,N-二甲基甲酰胺 、 mineral oil 为溶剂， 反应 3.67h， 生成 ethyl 2,4-di-O-benzyl-3-O-(2-pyridinecarbonyl)-1-thio-β-L-rhamnopyranoside
  参考文献：
  名称：

  Effect of Remote Picolinyl and Picoloyl Substituents on the Stereoselectivity of Chemical Glycosylation

  摘要：

  O-Picolinyl and O-picoloyl groups at remote positions (C-3, C-4, and C-6) can mediate glycosylation reactions by providing high or even complete facial selectivity for the attack of the glycosyl acceptor. The set of data presented herein offers a strong evidence of the intermolecular H-bond tethering between the glycosyl donor and glycosyl acceptor counterparts while providing a practical new methodology for the synthesis of either 1,2-cis or 1,2-trans linkages. Challenging glycosidic linkages including alpha-gluco, beta-manno, and beta-rhamno have seen obtained with high or complete stereocontrol.

  DOI：

  10.1021/ja307355n

文献信息

• Stereodirecting Effect of C3-Ester Groups on the Glycosylation Stereochemistry of L-Rhamnopyranose Thioglycoside Donors: Stereoselective Synthesis of α- and β-L-Rhamnopyranosides
  作者：Jin-Cai Lei、Yu-Xiong Ruan、Sheng Luo、Jin-Song Yang

  DOI：10.1002/ejoc.201901186

  日期：2019.10.9

  tuning effect of C3‐ester groups on the glycosylation stereochemistry of Lrhamnopyranose (L‐Rha) ethyl thioglycosides is described. The 3‐O‐arylcarbonyl or levulinoyl carrying L‐Rha thioglycosides undergo highly α‐selective glycosylation while the glycosylation of the 3‐O‐4‐nitropicoloyl and 2‐pyrazinecarbonyl L‐Rha thioglycosides displays β‐stereoselectivity

  描述了C3-酯基团对Lrhamnopyranose（L-Rha）乙基硫代糖苷的糖基化立体化学的调节作用。带有L-Rha硫糖苷的3-O-芳基羰基或乙酰丙酰基经历高度α-选择性糖基化作用，而3-O-4-亚硝基甲酰基和2-吡嗪羰基L-Rha硫糖苷的糖基化表现出β-立体选择性