trans-Methyl 2-aminocyclopentanecarboxylate hydrochloride | 1024618-24-3

• 分子结构分类: 有机化合物 - 有机酸及其衍生物 - 羧酸及其衍生物
• 英文名称: trans-Methyl 2-aminocyclopentanecarboxylate hydrochloride
• 英文别名: methyl (1R,2R)-2-aminocyclopentane-1-carboxylate;hydrochloride
• CAS: 1024618-24-3
• 化学式: C₇H₁₃NO₂*ClH
• 分子量: 179.647
• InChiKey: KXQFCNYQRWIKML-KGZKBUQUSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  0.71
• 重原子数：
  11
• 可旋转键数：
  2
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.86
• 拓扑面积：
  52.3
• 氢给体数：
  2
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  trans-Methyl 2-aminocyclopentanecarboxylate hydrochloride 在 钯 氢气 、 1-羟基苯并三唑 、 盐酸-N-乙基-Nˊ-(3-二甲氨基丙基)碳二亚胺 作用下， 以 甲醇 、 N,N-二甲基甲酰胺 为溶剂， -30.0~25.0 ℃ 、101.33 kPa 条件下， 反应 27.0h， 生成 (1R,2R)-L-aspartyl-trans-2-aminocyclopentanecarboxylic acid methyl ester
  参考文献：
  名称：

  Probing a molecular model of taste utilizing peptidomimetic stereoisomers of 2-aminocyclopentanecarboxylic acid methyl ester

  摘要：

  On the basis of the preferred conformations of L-aspartyl dipeptide derivatives containing alpha-amino acids at the second position and their retro-inverso analogues deduced by a combination of X-ray crystallography, H-1 NMR spectroscopy, and molecular mechanics calculations, we have proposed a model describing the molecular array required for the sweet taste. The conformation of a sweet molecule is described as possessing an "L shape", with the AH (proton donor) and B (proton acceptor) zwitterionic ring of the aspartyl moiety forming the stem, and the hydrophobic group X forming the base of the "L". Planarity of the molecule in the x and y dimensions is critical for sweet taste. Substantial deviation from this plane into negative z dimension is correlated with bitter taste while other deviations lead to tasteless molecules. To examine the model, the preferred conformations for a series of L-aspartyl dipeptides containing a 2-aminocyclopentanecarboxylic acid (2-Ac5c) residue at the second position were calculated using molecular mechanics. The peptidomimetic 2-Ac5c residue is a beta-amino acid with two chiral centers, resulting in four isomers [trans-(1S,2S)-2-Ac5c, trans-(1R,2R)-2-Ac5c, cis-(1R,2S)-2-Ac5c, and cis-(1S,2R)-2-Ac5c]. Two stereoisomers, L-aspartyl-trans-(1R,2R)-2-aminocyclopentanecarboxylic acid methyl ester [Asp-trans-(1R,2R)-2-Ac5c-OMe] and L-aspartyl-cis-(1S,2R)-2-aminocyclopentanecarboxylic acid methyl ester [Asp-cis-(1S,2R)-2-Ac5c-OMe], prefer the L-shape conformations and are thus predicted to be sweet. For L-aspartyl-trans-(1S,2S)-2-aminocyclopentanecarboxylic acid methyl ester [Asp-trans-(1S,2S)-2-Ac5c-OMe], the methyl ester group projects behind the stem of the L shape, producing a large negative z component and is predicted to exhibit a bitter taste. The calculations predict that L-aspartyl-cis-(1R,2S)-2-aminocyclopentanecarboxylic acid methyl ester [Asp-cis-(1R,2S)-2-Ac5c-OMe] will be tasteless. In this investigation, in addition to the calculations, we report the synthesis and experimental conformational analysis of the four stereoisomers of Asp-2-Ac5c-OMe. The absolute configurations of the 2-Ac5c residues were assigned by X-ray diffraction studies and by correlating optical rotation and enantiomeric excess values. These studies fully confirm our configurational assignments of the stereoisomers of Asp-2-Ac5c-OMe. Thus, the structure-taste relationships observed for the new class of L-aspartyl taste ligands containing the 2-Ac5c beta-amino acid methyl esters in the second position agree with and strengthen our model for the sweet and bitter taste responses.

  DOI：

  10.1021/jo00023a033
• 作为产物：
  描述：

  (trans-(1R,2R)-2-aminocyclopentanecarbonyl)-(R)-(+)-α-methylbenzylamine 在 盐酸 、 氯化亚砜 作用下， 反应 12.0h， 生成 trans-Methyl 2-aminocyclopentanecarboxylate hydrochloride
  参考文献：
  名称：

  Probing a molecular model of taste utilizing peptidomimetic stereoisomers of 2-aminocyclopentanecarboxylic acid methyl ester

  摘要：

  On the basis of the preferred conformations of L-aspartyl dipeptide derivatives containing alpha-amino acids at the second position and their retro-inverso analogues deduced by a combination of X-ray crystallography, H-1 NMR spectroscopy, and molecular mechanics calculations, we have proposed a model describing the molecular array required for the sweet taste. The conformation of a sweet molecule is described as possessing an "L shape", with the AH (proton donor) and B (proton acceptor) zwitterionic ring of the aspartyl moiety forming the stem, and the hydrophobic group X forming the base of the "L". Planarity of the molecule in the x and y dimensions is critical for sweet taste. Substantial deviation from this plane into negative z dimension is correlated with bitter taste while other deviations lead to tasteless molecules. To examine the model, the preferred conformations for a series of L-aspartyl dipeptides containing a 2-aminocyclopentanecarboxylic acid (2-Ac5c) residue at the second position were calculated using molecular mechanics. The peptidomimetic 2-Ac5c residue is a beta-amino acid with two chiral centers, resulting in four isomers [trans-(1S,2S)-2-Ac5c, trans-(1R,2R)-2-Ac5c, cis-(1R,2S)-2-Ac5c, and cis-(1S,2R)-2-Ac5c]. Two stereoisomers, L-aspartyl-trans-(1R,2R)-2-aminocyclopentanecarboxylic acid methyl ester [Asp-trans-(1R,2R)-2-Ac5c-OMe] and L-aspartyl-cis-(1S,2R)-2-aminocyclopentanecarboxylic acid methyl ester [Asp-cis-(1S,2R)-2-Ac5c-OMe], prefer the L-shape conformations and are thus predicted to be sweet. For L-aspartyl-trans-(1S,2S)-2-aminocyclopentanecarboxylic acid methyl ester [Asp-trans-(1S,2S)-2-Ac5c-OMe], the methyl ester group projects behind the stem of the L shape, producing a large negative z component and is predicted to exhibit a bitter taste. The calculations predict that L-aspartyl-cis-(1R,2S)-2-aminocyclopentanecarboxylic acid methyl ester [Asp-cis-(1R,2S)-2-Ac5c-OMe] will be tasteless. In this investigation, in addition to the calculations, we report the synthesis and experimental conformational analysis of the four stereoisomers of Asp-2-Ac5c-OMe. The absolute configurations of the 2-Ac5c residues were assigned by X-ray diffraction studies and by correlating optical rotation and enantiomeric excess values. These studies fully confirm our configurational assignments of the stereoisomers of Asp-2-Ac5c-OMe. Thus, the structure-taste relationships observed for the new class of L-aspartyl taste ligands containing the 2-Ac5c beta-amino acid methyl esters in the second position agree with and strengthen our model for the sweet and bitter taste responses.

  DOI：

  10.1021/jo00023a033

文献信息

• The Bip Method, Based on the Induced Circular Dichroism of a Flexible Biphenyl Probe in Terminally Protected -Bip-Xaa*- Dipeptides, for Assignment of the Absolute Configuration of β-Amino Acids
  作者：Laurence Dutot、Karen Wright、Anne Gaucher、Michel Wakselman、Jean-Paul Mazaleyrat、Marta De Zotti、Cristina Peggion、Fernando Formaggio、Claudio Toniolo

  DOI：10.1021/ja800059d

  日期：2008.5.1

  An induced axial chirality of the biphenyl core of the Bip (2',1':1,2;1'',2'':3,4-dibenzcyclohepta-1,3-diene-6-amino-6-carboxylic acid) residue in the terminally protected dipeptides Boc-Bip-beta-Xaa*-OMe (beta-Xaa* = L-beta(3)-HAla, L-beta(3)-HVal, L-beta(3)-HLeu, L-beta(3)-HPro, trans-(1S,2S)-ACHC, trans-(1R,2R)-ACHC, trans-(1S,2S)-ACPC, trans-(1R,2R)-ACPC) resulted in an induced circular dichroism

  Bip 联苯核的诱导轴向手性 (2',1':1,2;1'',2'':3,4-dibenzcyclohepta-1,3-diene-6-amino-6-carb acid ) 末端保护的二肽 Boc-Bip-beta-Xaa*-OMe (beta-Xaa* = L-beta(3)-HAla, L-beta(3)-HVal, L-beta(3)-HLeu, L-beta(3)-HPro, trans-(1S,2S)-ACHC, trans-(1R,2R)-ACHC, trans-(1S,2S)-ACPC, trans-(1R,2R)-ACPC)在诱导圆二色性中，揭示了 Bip 方法在可靠和快速分配手性 β-氨基酸的绝对构型方面的有用性。值得注意的是，Bip 方法还应用于独特的自旋标记、环状、β-氨基酸顺式/反式-β-TOAC 和反式-POAC。特别是，这项研究允许分配后一种化合物的对映异构体的未知绝对构型。
• Crystallographic Characterization of 12-Helical Secondary Structure in β-Peptides Containing Side Chain Groups
  作者：Soo Hyuk Choi、Ilia A. Guzei、Lara C. Spencer、Samuel H. Gellman

  DOI：10.1021/ja1062532

  日期：2010.10.6

  12-helical β-peptides, all containing residues that bear side chains. Four of the crystallized β-peptides include trans-4,4-dimethyl-2-aminocyclopentanecarboxylic acid (dm-ACPC) residues, and the fifth contains a β(3)-hPhe residue. These five β-peptides adopt fully folded 12-helical conformations in the solid state. The new crystal structures, along with previously reported data, allow a detailed characterization

  螺旋是研究最广泛的由 β-肽折叠体形成的二级结构。在五个已知的 β-肽螺旋中，12-螺旋特别有趣，因为内部氢键方向和大偶极类似于 α-肽螺旋（α-螺旋和 3（10）-螺旋）。β-肽的12-螺旋由i, i+3 C=O...HN 主链氢键定义，并由具有五元环约束的β-残基促进。12 螺旋支架已被用于生成具有特定生物功能的 β-肽，为此，必须将不同的侧链正确放置在主链上，并在折叠时正确排列在空间中。先前仅报道了 12-螺旋 β-肽的两种晶体结构，均用于反式-2-氨基环戊烷甲酸 (ACPC) 的均聚物。在这里，我们报告了 12 螺旋 β-肽的五个附加晶体结构，所有这些都包含带有侧链的残基。四个结晶的 β-肽包括反式-4,4-二甲基-2-氨基环戊烷甲酸 (dm-ACPC) 残基，第五个含有 β(3)-hPhe 残基。这五种 β-肽在固态下采用完全折叠的 12 螺旋构象。新的晶体结构，连同先前报道的数据，可以详细表征