(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。
• Triclorosilane-mediated stereoselective synthesis of β-amino esters and their conversion to highly enantiomerically enriched β-lactams
  作者：Stefania Guizzetti、Maurizio Benaglia、Martina Bonsignore、Laura Raimondi

  DOI：10.1039/c0ob00570c

  日期：——

  A highly stereoselective trichlorosilane-mediated reduction of N-benzyl enamines was developed; the combination of a low cost, easy to make metal-free catalyst and an inexpensive chiral auxiliary allowed to perform the reaction on substrates with different structural features often with total control of the stereoselectivity. By easy deprotection through hydrogenolysis followed by conversion of β-aminoester

  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。
• 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
  作者：Da-You Ma、De-Xian Wang、Jie Pan、Zhi-Tang Huang、Mei-Xiang Wang

  DOI：10.1021/jo800074k

  日期：2008.6.1

  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.