(2R,5S,6S)-5-(9H-fluoren-9-ylmethoxycarbonylamino)-2,6-dimethyloct-3-enoic acid | 1330116-94-3

• 分子结构分类: 有机化合物 - 苯类化合物 - 芴
• 英文名称: (2R,5S,6S)-5-(9H-fluoren-9-ylmethoxycarbonylamino)-2,6-dimethyloct-3-enoic acid
• CAS: 1330116-94-3
• 化学式: C₂₅H₂₉NO₄
• 分子量: 407.51
• InChiKey: VTWKQXPCNHOVIS-YSWVUKHVSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  5.22
• 重原子数：
  30.0
• 可旋转键数：
  8.0
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.36
• 拓扑面积：
  75.63
• 氢给体数：
  2.0
• 氢受体数：
  3.0

反应信息

• 作为反应物：
  描述：

  (2R,5S,6S)-5-(9H-fluoren-9-ylmethoxycarbonylamino)-2,6-dimethyloct-3-enoic acid 在 palladium 10% on activated carbon 、 氢气 作用下， 以 甲醇 为溶剂， 20.0 ℃ 、101.33 kPa 条件下， 反应 1.67h， 以77%的产率得到(2R,5R,6S)-5-(9H-fluoren-9-ylmethoxycarbonylamino)-2,6-dimethyloctanoic acid
  参考文献：
  名称：

  (E)-Alkene and Ethylene Isosteres Substantially Alter the Hydrogen-Bonding Network in Class II MHC A^q/Glycopeptide Complexes and Affect T-Cell Recognition

  摘要：

  The structural basis for antigen presentation by class II major histocompatibility complex (MHC) proteins to CD4(+) T-cells is important for understanding and possibly treating autoimmune diseases. In the work described in this paper, (E)-alkene and ethylene amide-bond isosteres were used to investigate the effect of removing hydrogen-bonding possibilities from the CII259-270 glycopeptide, which is bound by the arthritis-associated murine A(q) class II MHC protein. The isostere-modified glycopeptides showed varying and unexpectedly large losses of A(q) binding that could be linked to the dynamics of the system. Molecular dynamics (MD) simulations revealed that the backbone of CII259-270 and the A(q) protein are able to form up to 11 hydrogen bonds, but fewer than this number are present at any one time. Most of the strong hydrogen-bond interactions were formed by the N-terminal part of the glycopeptide, i.e., in the region where the isosteric replacements were made. The structural dynamics also revealed that hydrogen bonds were strongly coupled to each other; the loss of one hydrogen-bond interaction had a profound effect on the entire hydrogen-bonding network. The A(q) binding data revealed that an ethylene isostere glycopeptide unexpectedly bound more strongly to A(q) than the corresponding (E)-alkene, which is in contrast to the trend observed for the other isosteres. Analysis of the MD trajectories revealed that the complex conformation of this ethylene isostere was structurally different and had an altered molecular interaction pattern compared to the other A(q)/glycopeptide complexes. The introduced amide-bond isosteres also affected the interactions of the glycopeptide/A(q) complexes with T-cell receptors. The dynamic variation of the patterns and strengths of the hydrogen-bond interactions in the class II MHC system is of critical importance for the class II MHC/peptide/TCR signaling system.

  DOI：

  10.1021/ja2038722
• 作为产物：
  描述：

  N-trifluoroacetyl-(S)-isoleucinol 在 chromium(VI) oxide 、 正丁基锂 、 四溴化碳 、 硫酸 、 四丁基氟化铵 、 sodium carbonate 、 potassium carbonate 、 三苯基膦 作用下， 以 四氢呋喃 、 甲醇 、 正己烷 、 水 、 丙酮 、 甲苯 、 乙腈 为溶剂， 反应 181.42h， 生成 (2R,5S,6S)-5-(9H-fluoren-9-ylmethoxycarbonylamino)-2,6-dimethyloct-3-enoic acid
  参考文献：
  名称：

  (E)-Alkene and Ethylene Isosteres Substantially Alter the Hydrogen-Bonding Network in Class II MHC A^q/Glycopeptide Complexes and Affect T-Cell Recognition

  摘要：

  The structural basis for antigen presentation by class II major histocompatibility complex (MHC) proteins to CD4(+) T-cells is important for understanding and possibly treating autoimmune diseases. In the work described in this paper, (E)-alkene and ethylene amide-bond isosteres were used to investigate the effect of removing hydrogen-bonding possibilities from the CII259-270 glycopeptide, which is bound by the arthritis-associated murine A(q) class II MHC protein. The isostere-modified glycopeptides showed varying and unexpectedly large losses of A(q) binding that could be linked to the dynamics of the system. Molecular dynamics (MD) simulations revealed that the backbone of CII259-270 and the A(q) protein are able to form up to 11 hydrogen bonds, but fewer than this number are present at any one time. Most of the strong hydrogen-bond interactions were formed by the N-terminal part of the glycopeptide, i.e., in the region where the isosteric replacements were made. The structural dynamics also revealed that hydrogen bonds were strongly coupled to each other; the loss of one hydrogen-bond interaction had a profound effect on the entire hydrogen-bonding network. The A(q) binding data revealed that an ethylene isostere glycopeptide unexpectedly bound more strongly to A(q) than the corresponding (E)-alkene, which is in contrast to the trend observed for the other isosteres. Analysis of the MD trajectories revealed that the complex conformation of this ethylene isostere was structurally different and had an altered molecular interaction pattern compared to the other A(q)/glycopeptide complexes. The introduced amide-bond isosteres also affected the interactions of the glycopeptide/A(q) complexes with T-cell receptors. The dynamic variation of the patterns and strengths of the hydrogen-bond interactions in the class II MHC system is of critical importance for the class II MHC/peptide/TCR signaling system.

  DOI：

  10.1021/ja2038722