(R)-3-benzylamino-4-methyl-pentanoic acid methyl ester | 608127-93-1

• 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: (R)-3-benzylamino-4-methyl-pentanoic acid methyl ester
• 英文别名: (R)-methyl 3-(benzylamino)-4-methylpentanoate；methyl (3R)-3-(benzylamino)-4-methylpentanoate
• CAS: 608127-93-1
• 化学式: C₁₄H₂₁NO₂
• 分子量: 235.326
• InChiKey: IERRFRAHEYDEAH-CYBMUJFWSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.5
• 重原子数：
  17
• 可旋转键数：
  7
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.5
• 拓扑面积：
  38.3
• 氢给体数：
  1
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  (R)-3-benzylamino-4-methyl-pentanoic acid methyl ester 在 palladium on activated charcoal 氢气 作用下， 以 甲醇 为溶剂， 生成 (R)-β³-homovalyl methyl ester
  参考文献：
  名称：

  Nitrile Biotransformations for the Synthesis of Highly Enantioenriched β-Hydroxy and β-Amino Acid and Amide Derivatives: A General and Simple but Powerful and Efficient Benzyl Protection Strategy To Increase Enantioselectivity of the Amidase

  摘要：

  Biotransformations of a number of racemic beta-hydroxy and beta-amino nitrile derivatives were studied using Rhodococcus erythropolis AJ270, the nitrile hydratase and amidase-containing microbial whole cell catalyst, under very mild conditions. The overall enantioselectivity of nitrile biotransformations was governed predominantly by the amidase whose enantioselectivity was switched on remarkably by an O- and a N-benzyl protection group of the Substrates. While biotransformations of beta-hydroxy and beta-amino alkanenitriles gave low yields of amide and acid products of very low enantiomeric purity, introduction of a simple benzyl protection group on the beta-hydroxy and beta-amino of nitrile substrates led to the formation of highly enantioenriched beta-benzyloxy and beta-benzylamino amides and acids in almost quantitative yield. The easy protection and deprotection operations, high chemical yield, and excellent enantioselectivity render the nitrile biotransformation a useful protocol in the synthesis of enantiopure beta-hydroxy and beta-amino acids.

  DOI：

  10.1021/jo800074k
• 作为产物：
  描述：

  ethyl (Z)-3-(benzylamino)-4-methyl-2-pentenoate 在 4-chloro-N-[(1R,2S)-1-hydroxy-1-phenylpropan-2-yl]-N-methylpyridine-2-carboxamide 、 三氯硅烷 作用下， 以 二氯甲烷 为溶剂， 反应 18.0h， 生成 (S)-methyl 3-(benzylamino)-4-methylpentanoate 、 (R)-3-benzylamino-4-methyl-pentanoic acid methyl ester
  参考文献：
  名称：

  三氯硅烷介导的β-氨基酯的立体选择性合成及其转化为高度对映体富集的β-内酰胺†

  摘要：

  已经开发出高度立体选择性的三氯硅烷介导的N-苄基烯胺的还原；低成本，易于制造的不含金属的催化剂与廉价的手性助剂的结合，通常可以完全控制立体选择性，从而在具有不同结构特征的底物上进行反应。通过容易的氢解脱保护，然后将β-氨基酯转化为2-氮杂环丁酮，对映体纯的β-内酰胺（> 98％ee）成功地完成了合成。

  DOI：

  10.1039/c0ob00570c

文献信息

• Process for producing either optically active n-substituted beta-amino acid and optically active n-substituted beta-amino acid ester or optically active n-substituted 2-homopipecolic acid and optically active n-substituted 2-homopipecolic acid ester
  申请人：Miyata Hiroyuki

  公开号：US20050170473A1

  公开（公告）日：2005-08-04

  The present invention discloses a process which comprises selectively hydrolyzing one enantiomer of racemic mixtures of an N-substituted β-amino acid alkyl ester or N-substituted 2-homopipecolic acid ester represented by the formula (I): wherein Ar, R 1 , R 2 , R 3 , R 4 and R 5 are the same as defined in the specification, in the presence of a hydrolase to form an optically active ((R) or (S))-N-substituted-β-amino acid or optically active ((R) or (S))-N-substituted 2-homopipecolic acid represented by the formula (II): and simultaneously to obtain an unreacted optically active ((S) or (R))-N-substituted β-amino acid alkyl ester or unreacted optically active ((S) or (R))-N-substituted 2-homopipecolic acid ester represented by the formula (III): which has a reverse steric absolute configuration to that of the compound represented by the formula (II).

  本发明揭示了一种过程，该过程包括在水解酶的存在下，选择性水解由公式（I）表示的N-取代β-氨基酸烷基酯或N-取代2-同环丙氨酸酯的混合物的一个对映体，其中Ar，R1，R2，R3，R4和R5与说明书中定义的相同，形成一个光学活性的（R）或（S）-N-取代β-氨基酸或光学活性的（R）或（S）-N-取代2-同环丙氨酸，其由公式（II）表示，并同时获得未反应的光学活性的（S）或（R）-N-取代β-氨基酸烷基酯或未反应的光学活性的（S）或（R）-N-取代2-同环丙氨酸酯，其由公式（III）表示，其具有与由公式（II）表示的化合物相反的立体绝对构型。