-N-methyl-L-valine methyl ester | 128892-32-0

• 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: -N-methyl-L-valine methyl ester
• 英文别名: Z-L-MeVal-L-MeVal-OMe；Z-MeVal-MeVal-OCH3；Z-MeVal-MeVal-OMe；Z-MeVal-MeValOMe；Cbz-N(Me)Val-N(Me)Val-OMe；methyl (2S)-3-methyl-2-[methyl-[(2S)-3-methyl-2-[methyl(phenylmethoxycarbonyl)amino]butanoyl]amino]butanoate
• CAS: 128892-32-0
• 化学式: C₂₁H₃₂N₂O₅
• 分子量: 392.495
• InChiKey: XSDQERLILVFZTC-ROUUACIJSA-N

物化性质

• 沸点：
  498.2±45.0 °C(Predicted)
• 密度：
  1.099±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  3.8
• 重原子数：
  28
• 可旋转键数：
  10
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.57
• 拓扑面积：
  76.2
• 氢给体数：
  0
• 氢受体数：
  5

反应信息

• 作为产物：
  描述：

  N-苄氧羰基-N-甲基-L-缬氨酸 在 palladium on activated charcoal 盐酸 、 氢气 、 N,N-二异丙基乙胺 、 bromo-tris(1-pyrrolidinyl)phosphonium hexafluorophosphate 作用下， 以 甲醇 、 乙醚 、 二氯甲烷 为溶剂， 反应 7.02h， 生成 -N-methyl-L-valine methyl ester
  参考文献：
  名称：

  Coupling N-Methylated Amino Acids Using PyBroP and PyCloP Halogenophosphonium Salts: Mechanism and Fields of Application

  摘要：

  PyBroP (1) and PyCloP (2), two halotripyrrolidinophosphonium hexafluorophosphates, are peptide-coupling reagents highly efficient for coupling N-methylated amino esters, in contrast with PyBOP (3), the hydroxybenzotriazolyl analogue. These halogenophosphonium salts 1 and 2 are convenient (one-pot reactions) stable solids soluble in conventional solvents. Use of them gave an excellent peptide yield with essentially no epimerization. Activation with these reagents probably involves the formation of an (acyloxy)phosphonium, as shown in the case of 2,4,6-trimethylbenzoic acid activation. In the case of reagents 1 and 2, oxazolone and/or a symmetrical anhydride were intermediates which were rapidly aminolyzed. In contrast, the benzotriazolyl ester intermediate which was formed with PyBOP (3) was poorly reactive with N-methylated amino esters. PyBroP (1) and PyCloP (2) were less efficient in the coupling of some Boc-amino acids because of N-carboxyanhydride formation; this was particularly the case when Boc-Val-OH or Boc-MeVal-OH was coupled with MeVal-OMe.

  DOI：

  10.1021/jo00088a027

文献信息

• 2-Bromo-1-ethyl Pyridinium Tetrafluoroborate (BEP): A Powerful Coupling Reagent for<i>N</i>-Methylated Peptide Synthesis
  作者：Peng Li、Jie Cheng Xu

  DOI：10.1246/cl.2000.204

  日期：2000.3

  tetrafluoroborate (BEP) was firstly utilized to the synthesis of peptides containing N-methyl amino acid residues both in solution and solid phase, and demonstrated high reactivity, low racemization and excellent yields, which were approved by the successful synthesis of a series of oligopeptides and hindered peptide fragments, such as the 8-11 segment of Cyclosporine A and the pentapeptide moiety of Dolastatin

  2-溴-1-乙基四氟硼酸吡啶鎓（BEP）首次用于溶液和固相合成含N-甲基氨基酸残基的肽，并表现出高反应性、低外消旋化和优异的产率，并获得了国家批准。成功合成了一系列寡肽和受阻肽片段，如环孢菌素A的8-11片段和Dolastatin 15的五肽部分。
• Brop: A new reagent for coupling N-methylated amino acids
  作者：Jacques Coste、Marie-Noëlle Dufour、Antoine Pantaloni、Bertrand Castro

  DOI：10.1016/s0040-4039(00)94598-2

  日期：1990.1

  BroP (bromo tris(dimethylamino) phosphonium hexafluorophosphate) is a particularly suitable reagent for coupling N-methylated amino acids. It is stable and gives very high yields in short reaction times. Dipeptides are obtained without appreciable epimerization.

  BroP（溴化三（二甲基氨基）六氟磷酸phospho）是用于偶联N-甲基化氨基酸的特别合适的试剂。它是稳定的，并且在短的反应时间内给出了很高的产率。在没有明显差向异构的情况下获得二肽。
• 1-Ethyl 2-Halopyridinium Salts, Highly Efficient Coupling Reagents for Hindered Peptide Synthesis both in Solution and the Solid-Phase
  作者：Peng Li、Jie-Cheng Xu

  DOI：10.1016/s0040-4020(00)00657-8

  日期：2000.10

  proved to be very effective for the synthesis of hindered peptides containing N-methylated or Cα,Cα-dialkylated amino acid residues. HPLC monitoring of model reactions indicated that these pyridinium salts demonstrated higher reactivities, lower racemization than the commonly used halogenated uronium and phosphonium salts. The efficiency of these pyridinium type coupling reagents was further proved by the

  1-乙基-2-卤代吡啶鎓盐，BEP，FEP，BEPH和FEPH，合成并证明是含有受阻的肽的合成是非常有效的Ñ甲基化的或Ç α，Ç α-二烷基化的氨基酸残基。HPLC对模型反应的监测表明，与通常使用的卤化铀盐和phospho盐相比，这些吡啶鎓盐具有更高的反应活性和更低的消旋性。通过合成一系列受阻的寡肽和活性酯，具有良好的收率和方便的后处理，进一步证明了这些吡啶鎓类偶联剂的效率。使用这些吡啶鎓盐还成功合成了环孢菌素A（CsA）的8-11四肽片段和Dolastatin 15的五肽部分。这些吡啶鎓类偶联剂对SPPS的效率还通过CsA的极受阻碍的8-11肽段和CsO的线性十一肽的固相合成证明。1 H NMR，IR和HPLC。提出主要的反应性中间体是N-保护的氨基酸或肽的相应的酰卤和酰氧基吡啶鎓盐。
• CF3-NO2-PyBOP1: A new and highly efficient coupling reagent for N-methyl amino acids
  作者：J.C.H.M Wijkmans、F.A.A Blok、G.A van der Marel、J.H van Boom、W Bloemhoff

  DOI：10.1016/0040-4039(95)00807-o

  日期：1995.6

  1-Hydroxy-4-nitro-6-(trifluoromethyl)benzotriazole-containing phosphonium salt CF3-NO2PyBOP (1h) proved to be a powerful reagent for in situ coupling of N-methylated amino acids.

  含1-羟基-4-硝基-6-（三氟甲基）苯并三唑的phospho盐CF 3 -NO 2 PyBOP（1h）被证明是用于原位偶联N-甲基化氨基酸的有效试剂。
• Highly Efficient Synthesis of Sterically Hindered Peptides Containing N-Methylated Amino Acid Residues using a Novel 1H-Benzimidazolium Salt
  作者：Peng Li、Jie Cheng Xu

  DOI：10.1016/s0040-4020(00)00963-7

  日期：2000.12

  Novel 1H-benzimidazolium type peptide coupling reagent, CMBI, was designed, synthesized, and shown to be efficient in the promotion of the formation of sterically hindered amide and ester bonds. Its high efficiency was proved by model reaction tests and the successful synthesis of various hindered oligopeptides and peptide segments containing N-methyl amino acid residues with fast reaction speeds, low

  设计，合成了新型1 H-苯并咪唑型肽偶联剂CMBI，证明其在促进空间位阻酰胺和酯键形成方面是有效的。通过模型反应试验和成功合成了各种受阻寡肽和含有N-甲基氨基酸残基的肽段，证明了其高效率，其反应速度快，外消旋化程度低且产率高。提出了由试剂介导的酰胺键形成机理。