(S)-4-methyl-2-phenylpentanoic acid | 21490-56-2

• 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: (S)-4-methyl-2-phenylpentanoic acid
• 英文别名: (2S)-4-methyl-2-phenylpentanoic acid
• CAS: 21490-56-2
• 化学式: C₁₂H₁₆O₂
• 分子量: 192.258
• InChiKey: DHURPAIUOZIQDQ-NSHDSACASA-N

物化性质

• 沸点：
  298.3±9.0 °C(Predicted)
• 密度：
  1.044±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  3.1
• 重原子数：
  14
• 可旋转键数：
  4
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.42
• 拓扑面积：
  37.3
• 氢给体数：
  1
• 氢受体数：
  2

反应信息

• 作为产物：
  描述：

  (E)-4-Methyl-2-phenyl-pent-2-enoic acid 在 5%-palladium/activated carbon 、 氢气 、 辛可尼丁 、 苄胺 作用下， 以 1,4-二氧六环 、 水 为溶剂， 23.0 ℃ 、101.33 kPa 条件下， 生成 (R)-4-methyl-2-phenylpentanoic acid 、 (S)-4-methyl-2-phenylpentanoic acid
  参考文献：
  名称：

  Structural requirements for substrate in highly enantioselective hydrogenation over the cinchonidine-modified Pd/C

  摘要：

  Relationship between substrate Structure and enantioselectivity is studied for the asymmetric hydrogenation of 42 different (E)-alpha, beta-disubstituted acrylic acids (propenoic acids) over cinchonidine-modified Pd/C. The beta-phenyl group is indispensable for high enantioselectivity of alpha-phenylcinnamic acid (2,3-diphenylpropenoic acid, 81% ee), and substitution on this group affects markedly the selectivity. The high ee up to 92% was achieved by the beta-p-alkoxyphenyl substitution, and the selectivity is ascribed mainly to stronger interaction of the substrate with the chiral modifier on the catalyst surface. In contrast, substitution on the alpha-phenyl group does not affect notably the enantioselectivity (80-82% ee) or even the alpha-phenyl group itself is not indispensable but replaceable with a properly bulky group for the high enantioselectivity, (C) 2008 Elsevier Inc. All rights reserved.

  DOI：

  10.1016/j.jcat.2008.11.022

文献信息

• Highly Enantioselective Direct Alkylation of Arylacetic Acids with Chiral Lithium Amides as Traceless Auxiliaries
  作者：Craig E. Stivala、Armen Zakarian

  DOI：10.1021/ja205107x

  日期：2011.8.10

  A direct, highly enantioselective alkylation of arylacetic acids via enediolates using a readily available chiral lithium amide as a stereodirecting reagent has been developed. This approach circumvents the traditional attachment and removal of chiral auxiliaries used currently for this type of transformation. The protocol is operationally simple, and the chiral reagent is readily recoverable.

  已经开发出使用容易获得的手性氨基锂作为立体定向试剂通过烯二醇对芳基乙酸进行直接、高度对映选择性的烷基化。这种方法绕过了目前用于此类转化的手性助剂的传统附着和去除。该方案操作简单，手性试剂易于回收。