methyl (R)-2-(N-acetylamino)-4-methylpentanoate | 35799-87-2

• 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: methyl (R)-2-(N-acetylamino)-4-methylpentanoate
• 英文别名: (R)-methyl 2-acetamido-4-methylpentanoate；Methyl (2R)-2-acetamido-4-methylpentanoate
• CAS: 35799-87-2
• 化学式: C₉H₁₇NO₃
• 分子量: 187.239
• InChiKey: IIGAKARAJMXVOZ-MRVPVSSYSA-N

物化性质

• 沸点：
  291.7±13.0 °C(Predicted)
• 密度：
  0.999±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  0.6
• 重原子数：
  13
• 可旋转键数：
  5
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.78
• 拓扑面积：
  55.4
• 氢给体数：
  1
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  二碳酸二叔丁酯 、 methyl (R)-2-(N-acetylamino)-4-methylpentanoate 在 4-二甲氨基吡啶 、 肼 作用下， 生成 BOC-D-亮氨酸甲酯
  参考文献：
  名称：

  A Mild Amide to Carbamate Transformation

  摘要：

  DOI：

  10.1021/jo970903j
• 作为产物：
  描述：

  2-氧代-4-甲基戊酸甲酯 在 (2S,3S)-bis(diphenylphosphino)butane rhodium norbornadiene perchlorate 甲醇 、 氢气 、 potassium iodide 、 锌 、 三氯氧磷 作用下， 以 甲醇 、 丙酮 、 甲苯 为溶剂， 20.0~25.0 ℃ 、344.73 kPa 条件下， 反应 19.0h， 生成 methyl (R)-2-(N-acetylamino)-4-methylpentanoate
  参考文献：
  名称：

  Catalytic asymmetric hydrogenation of methyl (E)- and (Z)-2-acetamido-3-alkylacrylates

  摘要：

  DOI：

  10.1021/jo00338a007

文献信息

• Catalytic Asymmetric Hydrogenation of<b><i>α</i></b>-(Acetamido)acrylates Using TRAP Trans-Chelating Chiral Bisphosphine Ligands: Remarkable Effects of Ligand<b><i>P</i></b>-Substituent and Hydrogen Pressure on Enantioselectivity
  作者：Ryoichi Kuwano、Masaya Sawamura、Yoshihiko Ito

  DOI：10.1246/bcsj.73.2571

  日期：2000.11

  β-substituent and the ligand P-substituent as well as decreasing hydrogen pressure. The selectivity for the (R)-product in the reaction with EtTRAP-rhodium catalyst at 60 °C and 0.5 kg cm-2 of hydrogen pressure was as follows: R = H, 96% ee; R = Me, 92% ee; R = Ph, 77% ee; R = i-Pr, 57% ee. The remarkable steric and pressure effects caused a dramatic reversal of enantioselectivity in the reaction of methyl

  用 [Rh(cod)2]BF4 和反式螯合手性双膦配体 (S,S)-2,2'-双 [( R)-1-(二烷基膦基)乙基]-1,1'-二茂铁[(R,R)-(S,S)-TRAPs]。在β-未取代或β-单取代的α-(乙酰氨基)丙烯酸酯[(E)-RCH=C(NHAc)CO2Me]的反应中，(R)-氢化产物的选择性随着底物β-空间需求的降低而增加取代基和配体 P 取代基以及降低氢压。在 60 °C 和 0.5 kg cm-2 氢气压力下与 EtTRAP-铑催化剂反应的 (R)-产物的选择性如下：R = H，96% ee；R = Me，92% ee；R = Ph，77% ee；R = i-Pr，57% ee。显着的空间和压力效应导致 2-(N-乙酰氨基) 肉桂酸甲酯 (R = Ph) 反应中对映选择性的显着逆转。例如，在 60 °C 和 0.1 kg cm-2 氢气压力下使用 EtTRAP 的选择性为 87%
• Application of Chiral Mixed Phosphorus/Sulfur Ligands to Enantioselective Rhodium-Catalyzed Dehydroamino Acid Hydrogenation and Ketone Hydrosilylation Processes
  作者：David A. Evans、Forrest E. Michael、Jason S. Tedrow、Kevin R. Campos

  DOI：10.1021/ja012639o

  日期：2003.3.1

  Rh-catalyzed dehydroamino acid hydrogenation and ketone hydrosilylation reactions (eqs 1, 2). After assaying the influence of the substituents at sulfur, the substituents on the ligand backbone, the relative stereochemistry within the ligand backbone, and the substituents at phosphorus, ligands 2c (R = 3,5-dimethylphenyl) and 3 were found to be optimal in the Rh-catalyzed hydrogenation of a variety of alpha-acylaminoacrylates

  手性混合磷/硫配体 1-3 已被证明在对映选择性 Rh 催化的脱氢氨基酸氢化和酮氢化硅烷化反应中有效（方程式 1、2）。在测定硫上的取代基、配体骨架上的取代基、配体骨架内的相对立体化学以及磷上的取代基的影响后，发现配体 2c (R = 3,5-二甲基苯基) 和 3 在以高对映选择性 (89-97% ee) 对各种 α-酰基氨基丙烯酸酯进行 Rh 催化氢化。对用于 Rh 催化的酮氢化硅烷化的催化剂进行类似的优化表明，配体 3 为各种芳烷基和二烷基酮提供了最高的对映选择性（高达 99% ee）。
• Highly enantioselective synthesis of non-natural aliphatic α-amino acids via asymmetric hydrogenation
  作者：Jianjian Ji、Caiyou Chen、Jiayu Cai、Xinrui Wang、Kai Zhang、Liyang Shi、Hui Lv、Xumu Zhang

  DOI：10.1039/c5ob01111f

  日期：——

  hydrogenated in a highly efficient and enantioselective way. Excellent enantioselectivities together with excellent yields were achieved for a series of substrates. An efficient approach for the synthesis of the intermediate of the orally administered anti-diabetic drugs Alogliptin and Linagliptin in the DPP-4 inhibitor class was also developed.

  通过使用铑-双膦配合物作为催化剂，β-烷基（Z）-N-乙酰基脱氢氨基酯以高效和对映选择性的方式平稳氢化。对于一系列底物，获得了优异的对映选择性和优异的产率。还开发了一种合成口服DPP-4抑制剂类抗糖尿病药物阿格列汀和利格列汀的中间体的有效方法。
• Lobell, Mario; Schneider, Manfred P., Journal of the Chemical Society. Perkin transactions I, 1998, # 2, p. 319 - 325
  作者：Lobell, Mario、Schneider, Manfred P.

  DOI：——

  日期：——
• Carbohydrate Phosphinites as Practical Ligands in Asymmetric Catalysis:  Electronic Effects and Dependence of Backbone Chirality in Rh-Catalyzed Asymmetric Hydrogenations. Synthesis of <i>R</i>- or <i>S</i>-Amino Acids Using Natural Sugars as Ligand Precursors
  作者：T. V. RajanBabu、Timothy A. Ayers、Gary A. Halliday、Kimberly K. You、Joseph C. Calabrese

  DOI：10.1021/jo970884d

  日期：1997.8.1

  Vicinal diarylphosphinites derived from carbohydrates are excellent ligands for the Rh(I)-catalyzed enantioselective asymmetric hydrogenation of dehydroamino acid derivatives, producing the highest enantioselectivity of any ligands directly prepared from natural products. The enantioselectivity can be enhanced by the appropriate choice of substituents on the aromatic rings of the phosphinites. For example, the use of phosphinites with electron-donating bis(3,5-dimethylphenyl) groups on phosphorus provides ee's up to 99% for a wide range of amino acids including some with easily removable N-protecting groups. Electron-withdrawing aryl substituents, on the other hand, decrease the enantioselectivity. Sense of chiral induction in the amino acid product depends on the relative juxtaposition of the vicinal diphosphinites on a given sugar backbone. When readily available D-glucopyranosides are used as the starting sugars, 2,3-phosphinites give the S-amino acids and 3,4-phosphinites give the R-amino acids. In the case of aromatic and heteroaromatic amino acids, enantioselectivities > 95% are consistently obtained. Practical considerations such as the ease of ligand synthesis, rates of reactions, catalyst turnover, and scope and limitations in terms of substrates are discussed. A possible explanation for the enhancement of enantioselectivity by electron-rich phosphinites is offered.