(2S,3R)-2-Amino-3-(4-methoxy-phenyl)-butyric acid | 758685-22-2

• 分子结构分类: 有机化合物 - 苯丙烷和聚酮 - 苯丙酸
• 英文名称: (2S,3R)-2-Amino-3-(4-methoxy-phenyl)-butyric acid
• 英文别名: (2s,3r)-2-Amino-3-(4-methoxyphenyl)butanoic acid
• CAS: 758685-22-2
• 化学式: C₁₁H₁₅NO₃
• 分子量: 209.245
• InChiKey: HYOLSKLZTOUWNN-XCBNKYQSSA-N

物化性质

• 沸点：
  354.0±37.0 °C(Predicted)
• 密度：
  1.170±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  -1.1
• 重原子数：
  15
• 可旋转键数：
  4
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.36
• 拓扑面积：
  72.6
• 氢给体数：
  2
• 氢受体数：
  4

反应信息

• 作为反应物：
  描述：

  (2S,3R)-2-Amino-3-(4-methoxy-phenyl)-butyric acid 在 盐酸 、 氢溴酸 、 三乙胺 作用下， 以 溶剂黄146 为溶剂， 反应 7.0h， 生成 (2S,3R,2'S)-N,O-Bis<2-(trifluoromethyl)-2-methoxyphenylacetyl>-β-methyltyrosine isobutyl ester
  参考文献：
  名称：

  Efficient method for the total asymmetric synthesis of the isomers of .beta.-methyltyrosine

  摘要：

  Alpha-Amino acids modified at the beta-carbon atom can provide topographical constraints when incorporated into a peptide. Such modifications can modulate the physical, chemical, and biological properties of the compound. In order to properly evaluate the effect of such modifications, large-scale asymmetric syntheses of the isomers are needed. A method for the stereoselective large-scale synthesis of an four stereoisomers of beta-methyltyrosine is described in this paper. The stereochemistry of both the alpha- and beta-stereocenters was set using 4-phenyl-2-oxazolidinone as a chiral auxiliary. The key reactions were an asymmetric Michael-like addition of an organocuprate to a chiral alpha,beta-unsaturated acyloxazolidinone (beta center) and subsequent stereoselective electrophilic bromination of the resulting product (alpha center). Conversion of the bromide to the azide, catalyzed hydrolysis to the azido acid with simultaneous recovery of the chiral auxiliary, reduction of the azide, and final deprotection of the phenol group afforded the desired amino acids. In general, the reactions were performed in yields over 80 %, and the isomers were obtained in enantiomeric purities of 98:2 to 99:1.

  DOI：

  10.1021/jo00078a042
• 作为产物：
  描述：

  (3(2S,3R),4R)-3-<2-Azido-3-(4-methoxyphenyl)butyroyl>-4-phenyl-2-oxazolidinone 在 palladium on activated charcoal 盐酸 、 lithium hydroxide 、 氢气 、 双氧水 作用下， 以 四氢呋喃 为溶剂， 25.0 ℃ 、101.33 kPa 条件下， 反应 15.75h， 生成 (2S,3R)-2-Amino-3-(4-methoxy-phenyl)-butyric acid
  参考文献：
  名称：

  Efficient method for the total asymmetric synthesis of the isomers of .beta.-methyltyrosine

  摘要：

  Alpha-Amino acids modified at the beta-carbon atom can provide topographical constraints when incorporated into a peptide. Such modifications can modulate the physical, chemical, and biological properties of the compound. In order to properly evaluate the effect of such modifications, large-scale asymmetric syntheses of the isomers are needed. A method for the stereoselective large-scale synthesis of an four stereoisomers of beta-methyltyrosine is described in this paper. The stereochemistry of both the alpha- and beta-stereocenters was set using 4-phenyl-2-oxazolidinone as a chiral auxiliary. The key reactions were an asymmetric Michael-like addition of an organocuprate to a chiral alpha,beta-unsaturated acyloxazolidinone (beta center) and subsequent stereoselective electrophilic bromination of the resulting product (alpha center). Conversion of the bromide to the azide, catalyzed hydrolysis to the azido acid with simultaneous recovery of the chiral auxiliary, reduction of the azide, and final deprotection of the phenol group afforded the desired amino acids. In general, the reactions were performed in yields over 80 %, and the isomers were obtained in enantiomeric purities of 98:2 to 99:1.

  DOI：

  10.1021/jo00078a042

文献信息

• Stereoselective Synthesis of β‐Branched Aromatic α‐Amino Acids by Biocatalytic Dynamic Kinetic Resolution**
  作者：Fuzhuo Li、Li‐Cheng Yang、Jingyang Zhang、Jason S. Chen、Hans Renata

  DOI：10.1002/anie.202105656

  日期：2021.8.2

  prepare a broad range of aromatic β-branched α-amino acids. Mechanistic studies show that the transformation proceeds through dynamic kinetic resolution that is unique to the optimal enzyme. To highlight its utility and practicality, the biocatalytic reaction was applied to the synthesis of several sp3-rich cyclic fragments and the first total synthesis of jomthonic acid A.

  β-支链非经典氨基酸是现代药物开发工作中有价值的分子。然而，由于需要以立体选择性方式设置多个立体中心，它们的制备仍然具有挑战性，而现代合成此类化合物的方法通常依赖于使用带有设计配体的稀有过渡金属催化剂。在此，我们报道了一种高度非对映选择性和对映选择性的生物催化氨基转移方法，可制备多种芳香族 β-支链 α-氨基酸。机理研究表明，转化通过最佳酶独有的动态动力学分辨率进行。为了突出其实用性和实用性，该生物催化反应被应用于几种 sp 3的合成富环状片段和第一次全合成jomthonic acid A。