ethyl (4R)-4-amino-5-methylhexanoate | 441012-58-4

• 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: ethyl (4R)-4-amino-5-methylhexanoate
• 英文别名: (R)-4-Amino-5-methylhexanoic acid ethyl ester
• CAS: 441012-58-4
• 化学式: C₉H₁₉NO₂
• 分子量: 173.255
• InChiKey: PBDRGNYDMSWKGQ-MRVPVSSYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.2
• 重原子数：
  12
• 可旋转键数：
  6
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.89
• 拓扑面积：
  52.3
• 氢给体数：
  1
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  ethyl (4R)-4-amino-5-methylhexanoate 在 4-二甲氨基吡啶 、 二异丁基氢化铝 、 三乙胺 作用下， 以 二氯甲烷 、 氯仿 、 甲苯 为溶剂， 反应 10.5h， 生成 (4R)-4-[N-(tert-butoxycarbonyl)-N-(2,4,6-trimethyl-phenylsulfonyl)amino]-5-methyl-hexan-1-ol
  参考文献：
  名称：

  A Highly cis-Selective Synthesis of 2-Ethynylaziridines by Intramolecular Amination of Chiral Bromoallenes:  Improvement of Stereoselectivity Based on the Computational Investigation

  摘要：

  The base-mediated intramolecular amination of bromoallenes having an axial chirality is described. The treatment of (4S,aR)-4-alkyl-4-[N-(arylsulfonyl)amino]-1-bromobuta-1,2-dienes with NaH in DMF affords 2,3-cis-2-ethynylaziridines in good to excellent selectivity (2,3-cis:trans = 92:8-99:1). The reaction of (4S,aS)-bromoallenes with NaH/DMF also gives 2,3-cis-2-ethynylaziridines selectively (79:21-91:9). These experimental results have been rationalized by 133LYP density functional calculations together with the 6-31 +G(d) basis set and the Onsager solvation model. The transition structures for cis-aziridine formation of both (4S,aR)- and (4S,aS)-bromoallenes in DMF are favored over the corresponding trans transition structures by 4.35 and 1.41 kcal/mol, respectively. Furthermore, the calculations predicted that a less polar solvent gives higher cis selectivity for (4S,aS)-bromoallenes. In fact, improvement of the cis selectivity to 99:1 has been realized by using a less polar solvent such as THF. The cyclization of bromoallenes bearing a beta- or gamma-amino group also affords four- and five-membered azacycles in a highly cis-selective manner.

  DOI：

  10.1021/ja0262277
• 作为产物：
  描述：

  ethyl (4S)-4-benzyloxycarbonylamino-5-methyl-3-oxo-2-triphenylphosphoranylidenehexanoate 在 palladium on activated charcoal 氢气 作用下， 以 甲醇 为溶剂， 600.0 ℃ 、6.67 Pa 条件下， 反应 12.0h， 生成 ethyl (4R)-4-amino-5-methylhexanoate
  参考文献：
  名称：

  Flash vacuum pyrolysis of stabilised phosphorus ylides. Part 17.1 Preparation of aliphatic amino acid derived γ-alkoxycarbonylamino-β-oxo ylides and pyrolysis to give α,β-acetylenic γ-amino acid and GABA analogues

  摘要：

  通过使用羰二亚胺肽偶联试剂，将N-烷氧羰基保护的氨基酸与Ph3PCHCO2Et缩合，制备了一系列十一种α-氨基酰稳定的膦叶立德9〜19。在600°C下进行闪蒸真空热解，它们会排出Ph3PO，以中等产率得到相应的α，β-炔基γ-氨基酯21〜29、33和34。在两种情况下，还形成了末端炔烃30和31。来自β-丙氨酸的β-氨基酰膦叶立德20在热解时同样生成α，β-炔基δ-氨基酯35。观察到HBr对一个炔基酯25的三键的选择性加成，得到E和Z α-溴丙烯酸酯36的混合物。对N-Cbz炔基酯21〜23和33的氢化导致N-脱保护和三键的氢化，以70〜>95%的ee提供手性GABA类似物37〜40，这由它们的Mosher酰胺的19F NMR确定。给出了所有膦叶立德和炔基酯衍生物的全分配13C NMR谱。

  DOI：

  10.1039/b110243e

文献信息

• Convenient synthesis of chiral α,β-acetylenic γ-amino acid derivatives and γ-aminobutyric acid analogues via stabilized ylides
  作者：R. Alan Aitken、Nzaira Karodia

  DOI：10.1039/cc9960002079

  日期：——

  Twelve examples of protected acetylenic amino acids are readily prepared in a two-step procedure involving formation and flash vacuum pyrolysis of chiral aminoacyl phosphorus ylides.
• Flash vacuum pyrolysis of stabilised phosphorus ylides. Part 17.1 Preparation of aliphatic amino acid derived γ-alkoxycarbonylamino-β-oxo ylides and pyrolysis to give α,β-acetylenic γ-amino acid and GABA analogues
  作者：R. Alan Aitken、Nazira Karodia、Tracy Massil、Robert J. Young

  DOI：10.1039/b110243e

  日期：2002.2.6

  A series of eleven α-aminoacyl stabilised phosphorus ylides 9–19 have been prepared by condensation of N-alkoxycarbonyl protected amino acids with Ph3PCHCO2Et using a carbodiimide peptide coupling reagent. Upon flash vacuum pyrolysis at 600 °C, these undergo extrusion of Ph3PO to give the corresponding α,β-acetylenic γ-amino esters 21–29, 33 and 34 in moderate yield. In two cases the terminal alkynes 30 and 31 are also formed. The β-aminoacyl ylide 20 from β-alanine similarly gives the α,β-acetylenic δ-amino ester 35 upon pyrolysis. Regioselective addition of HBr to the triple bond of one acetylenic ester 25 was observed giving a mixture of E and Z α-bromoacrylates 36. Hydrogenation of the N-Cbz acetylenic esters 21–23 and 33 results in N-deprotection and hydrogenation of the triple bond to afford the chiral GABA analogues 37–40 in 70 –>95% ee as determined by 19F NMR of their Mosher amides. Fully assigned 13C NMR spectra of all the ylides and acetylenic ester derivatives are presented.

  通过使用羰二亚胺肽偶联试剂，将N-烷氧羰基保护的氨基酸与Ph3PCHCO2Et缩合，制备了一系列十一种α-氨基酰稳定的膦叶立德9〜19。在600°C下进行闪蒸真空热解，它们会排出Ph3PO，以中等产率得到相应的α，β-炔基γ-氨基酯21〜29、33和34。在两种情况下，还形成了末端炔烃30和31。来自β-丙氨酸的β-氨基酰膦叶立德20在热解时同样生成α，β-炔基δ-氨基酯35。观察到HBr对一个炔基酯25的三键的选择性加成，得到E和Z α-溴丙烯酸酯36的混合物。对N-Cbz炔基酯21〜23和33的氢化导致N-脱保护和三键的氢化，以70〜>95%的ee提供手性GABA类似物37〜40，这由它们的Mosher酰胺的19F NMR确定。给出了所有膦叶立德和炔基酯衍生物的全分配13C NMR谱。
• A Highly <i>cis</i>-Selective Synthesis of 2-Ethynylaziridines by Intramolecular Amination of Chiral Bromoallenes:  Improvement of Stereoselectivity Based on the Computational Investigation
  作者：Hiroaki Ohno、Kaori Ando、Hisao Hamaguchi、Yusuke Takeoka、Tetsuaki Tanaka

  DOI：10.1021/ja0262277

  日期：2002.12.1

  The base-mediated intramolecular amination of bromoallenes having an axial chirality is described. The treatment of (4S,aR)-4-alkyl-4-[N-(arylsulfonyl)amino]-1-bromobuta-1,2-dienes with NaH in DMF affords 2,3-cis-2-ethynylaziridines in good to excellent selectivity (2,3-cis:trans = 92:8-99:1). The reaction of (4S,aS)-bromoallenes with NaH/DMF also gives 2,3-cis-2-ethynylaziridines selectively (79:21-91:9). These experimental results have been rationalized by 133LYP density functional calculations together with the 6-31 +G(d) basis set and the Onsager solvation model. The transition structures for cis-aziridine formation of both (4S,aR)- and (4S,aS)-bromoallenes in DMF are favored over the corresponding trans transition structures by 4.35 and 1.41 kcal/mol, respectively. Furthermore, the calculations predicted that a less polar solvent gives higher cis selectivity for (4S,aS)-bromoallenes. In fact, improvement of the cis selectivity to 99:1 has been realized by using a less polar solvent such as THF. The cyclization of bromoallenes bearing a beta- or gamma-amino group also affords four- and five-membered azacycles in a highly cis-selective manner.