Boc-Val-Ala-Leu-OMe | 161083-58-5

• 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: Boc-Val-Ala-Leu-OMe
• CAS: 161083-58-5
• 化学式: C₂₀H₃₇N₃O₆
• 分子量: 415.53
• InChiKey: HMKYJSKUAFAZCJ-KKUMJFAQSA-N

物化性质

• 沸点：
  588.2±40.0 °C(predicted)
• 密度：
  1.070±0.06 g/cm3(Temp: 20 °C; Press: 760 Torr)(predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  1.74
• 重原子数：
  29.0
• 可旋转键数：
  9.0
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.8
• 拓扑面积：
  122.83
• 氢给体数：
  3.0
• 氢受体数：
  6.0

反应信息

• 作为反应物：
  描述：

  Boc-Val-Ala-Leu-OMe 在 N-甲基吗啉 、 盐酸 、 1-羟基苯并三唑 、 1-(3-二甲基氨基丙基)-3-乙基碳二亚胺 作用下， 以 四氢呋喃 、 乙醚 为溶剂， 反应 37.0h， 生成 Boc-Val-Ala-Leu-Ama(OMe)-Val-Ala-Leu-OMe
  参考文献：
  名称：

  C-Alkylation of Peptides Containing Aminomalonate and (Amino)(cyano)acetate Residues

  摘要：

  N-Acetyl-, N-[(tert-butoxy)carbonyl](Boc)-, and N-[(benzyloxy)carbonyl](Z)-protected tri-, penta-, and heptapeptide methyl esters, 1-8, with a central aminomalonate (Ama) (allyl, methyl, benzyl, or tert-butyl) or (amino)(cyano)acetate (Aca) residue have been prepared by conventional techniques (Schemes 4-6). The new peptides with acidic backbone-bound CH groups can be C-alkylated with primary alkyl, allyl, and benzyl halides, under mildly basic conditions (1 equiv. MeONa or t-BuOK in THF); also, they can be added to Michael accepters such as acrylates, acrylonitrile, methyl vinyl ketone, or nitrostyrene (catalytic amounts of alkoxide bases in THF) (Schemes 7-16). In most cases, the products, 48-100, are formed in excellent yields (average of 77%); one of the epimeric products prevails (2:1 to > 20:1), and the epimers have been separated, isolated in pure form, and fully characterized (without configurational assignments); addition of the co-solvent 3,4,5,6-tetrahydro-1,3-dimethylpyrimidin-2(1H)-one (DMPU) or of LiBr may improve or even reverse the ratio of epimeric products formed; the heptapeptide derivative 8 had to be solubilized for alkylations in THF by the addition of 30 equiv. of LiBr. Cleavage of the Ama groups (benzyl with H-2/Pd-C, t-Bu with HCl/Et2O) gave carboxylate derivatives which are actually peptides containing the alkylated aminomalonic acid, the lower homolog of aspartic acid, as residue in the central position. These acids are quite resistant to decarboxylation which had to be achieved by heating at reflux in THF in the presence of 2 equiv. of LiBr and of catalytic amounts of pyridine (Schemes 17 and 18). A one-step removal of the allyl aminomalonate group is possible with Pd/PPh3/formate (Scheme 19). The resulting peptides, 101-115, were formed as separable I: 1 mixtures of two epimers. The CN group of the alkylated Aca residue can be removed reductively (Na/NH3; Scheme 20). The value of the new method is compared with that of existing methods of peptide-backbone modification.

  DOI：

  10.1002/(sici)1522-2675(19981007)81:10<1845::aid-hlca1845>3.0.co;2-l
• 作为产物：
  描述：

  Boc-Val-Ala-Leu-OBn 在 palladium on activated charcoal 氢气 作用下， 以 甲醇 、 乙醚 为溶剂， 反应 12.0h， 生成 Boc-Val-Ala-Leu-OMe
  参考文献：
  名称：

  C-Alkylation of Peptides Containing Aminomalonate and (Amino)(cyano)acetate Residues

  摘要：

  N-Acetyl-, N-[(tert-butoxy)carbonyl](Boc)-, and N-[(benzyloxy)carbonyl](Z)-protected tri-, penta-, and heptapeptide methyl esters, 1-8, with a central aminomalonate (Ama) (allyl, methyl, benzyl, or tert-butyl) or (amino)(cyano)acetate (Aca) residue have been prepared by conventional techniques (Schemes 4-6). The new peptides with acidic backbone-bound CH groups can be C-alkylated with primary alkyl, allyl, and benzyl halides, under mildly basic conditions (1 equiv. MeONa or t-BuOK in THF); also, they can be added to Michael accepters such as acrylates, acrylonitrile, methyl vinyl ketone, or nitrostyrene (catalytic amounts of alkoxide bases in THF) (Schemes 7-16). In most cases, the products, 48-100, are formed in excellent yields (average of 77%); one of the epimeric products prevails (2:1 to > 20:1), and the epimers have been separated, isolated in pure form, and fully characterized (without configurational assignments); addition of the co-solvent 3,4,5,6-tetrahydro-1,3-dimethylpyrimidin-2(1H)-one (DMPU) or of LiBr may improve or even reverse the ratio of epimeric products formed; the heptapeptide derivative 8 had to be solubilized for alkylations in THF by the addition of 30 equiv. of LiBr. Cleavage of the Ama groups (benzyl with H-2/Pd-C, t-Bu with HCl/Et2O) gave carboxylate derivatives which are actually peptides containing the alkylated aminomalonic acid, the lower homolog of aspartic acid, as residue in the central position. These acids are quite resistant to decarboxylation which had to be achieved by heating at reflux in THF in the presence of 2 equiv. of LiBr and of catalytic amounts of pyridine (Schemes 17 and 18). A one-step removal of the allyl aminomalonate group is possible with Pd/PPh3/formate (Scheme 19). The resulting peptides, 101-115, were formed as separable I: 1 mixtures of two epimers. The CN group of the alkylated Aca residue can be removed reductively (Na/NH3; Scheme 20). The value of the new method is compared with that of existing methods of peptide-backbone modification.

  DOI：

  10.1002/(sici)1522-2675(19981007)81:10<1845::aid-hlca1845>3.0.co;2-l

文献信息

• Peptide design. Helix–helix motifs in synthetic sequences
  作者：Arindam Banerjee、S. Raghothama、P. Balaram

  DOI：10.1039/a700624a

  日期：——

  Two centrally positioned α-aminoisobutyryl (Aib) residues have been used to stabilize distinct heptapeptide helical segments in the 15-residue synthetic sequence Boc-Met-Ala-Leu-Aib-Val-Ala-Leu-Acp-Val-Ala-Leu-Aib-Val-Ala-Phe-OMe. The helices are connected by the flexible linker ε-aminocaproic acid (Acp). NMR studies in CDCl3 establish helical conformations for both independent segments as evidenced by NH–NH nuclear Overhauser effects (NOEs). The peptide strongly aggregates in CDCl3 with the NH groups of Met(1) and Ala(2) participating in intermolecular hydrogen bonds. In (CD3)2SO two solvated helical segments are supported by NMR results. Solvent dependent breakdown of aggregates on addition of (CD3)2SO to CDCl3 solutions is suggested by analysis of chemical shifts and temperature coefficients of NH protons. The observation of several interhelical NOEs in CDCl3, relatively few NOEs in 10% (CD3)2SO–CDCl3 and their absence in (CD3)2SO provides a means of inferring helix orientations. While an antiparallel arrangement resulting in closed aggregate formation is suggested in CDCl3, a parallel solvated arrangement is favoured in (CD3)2SO.

  两个位于中央的α-氨基异丁酸(Aib)残基被用来稳定15残基合成序列Boc-Met-Ala-Leu-Aib-Val-Ala-Leu-Acp-Val-Ala-Leu-Aib-Val-Ala-Phe-OMe中不同的七肽螺旋片段。这些螺旋通过柔性连接子ε-氨基己酸(Acp)连接。在CDCl3中的核磁共振(NMR)研究确立了这两个独立片段的螺旋构象，这是通过NH–NH核Overhauser效应(NOEs)所证实的。在CDCl3中，该肽强烈聚集，其中Met(1)和Ala(2)的NH基团参与了分子间氢键。在(CD3)2SO中，NMR结果支持了两个溶剂化的螺旋片段。通过分析NH质子的化学位移和温度系数，暗示了随着(CD3)2SO加入到CDCl3溶液中，聚集物的溶剂依赖性分解。在CDCl3中观察到多个螺旋间NOEs，而在10% (CD3)2SO–CDCl3中NOEs相对较少，且在(CD3)2SO中完全缺失，这为我们推断螺旋方向提供了依据。虽然在CDCl3中推测形成了闭合的聚集物，并呈现反平行排列，但在(CD3)2SO中则倾向于平行溶剂化排列。
• Synthesis of Tri-, Penta-, and Heptapeptides Containing and (R)-2-alkyl-2-amino-3-(methylamino)-propionic acid residue in the central position
  作者：Dieter Seebach、Armido Studer、Elmar Pfammatter、Hans Widmer

  DOI：10.1002/hlca.19940770728

  日期：1994.11.2

  direction; mixed anhydride, bis(2)-oxooxazolidin-3-yl)phosphinoyl chloride (Bop-Cl), or dicyclohexylcarbodiimide (DCC), 2-amino-2-methyl-3-(methylamino)-propionic acid and 2-amino-2-ethyl-3-(methylamino)propionic acid ( = 2-amino-2-[(methylamino)methyl]butanoic acid) are incorporated in the central position of tri-, penta-, and heptapeptides (see 3–7, 21, and 22). The fragment coupling of the β -amino group

  通过常规的肽偶联方法（从C到N方向;混合酸酐，双（2）-恶恶唑烷-3-基）膦酰氯（Bop-Cl）或二环己基碳二亚胺（DCC），2-氨基-2-甲基-3- （甲基氨基）-丙酸和2-氨基-2-乙基-3-（甲基氨基）丙酸（= 2-氨基-2-[（（甲基氨基）甲基]丁酸）被并入三，五烷基的中心位置- ，和七肽（见3 - 7，21，和22）。四肽中二氨基酸部分的β-氨基的片段偶联导致部分差向异构化，因此，实际上获得了两种差向异构七肽衍生物（7和epi- 7）。最终对游离七肽的脱保护（涉及MeBocNH和MeOCONH的3 SiI裂解，用NaOH皂化和HPLC纯化）既得到了所需的产物（异肽21），其在肽主链内部具有β-氨基，又得到了转肽的产物（肽22），具有掺入的二氨基酸的α-氨基和（甲基氨基）甲基作为侧链。通过长时间用碱处理，肽22被完全转化为异肽21。七肽21是由精细的2QF-COZY和NOESY NMR测量H中分析2
• β-Peptides: Synthesis by Arndt-Eistert homologation with concomitant peptide coupling. Structure determination by NMR and CD spectroscopy and by X-ray crystallography. Helical secondary structure of a β-hexapeptide in solution and its stability towards pe
  作者：Dieter Seebach、Mark Overhand、Florian N. M. Kühnle、Bruno Martinoni、Lukas Oberer、Ulrich Hommel、Hans Widmer

  DOI：10.1002/hlca.19960790402

  日期：1996.6.26

  The β-hexapeptide (H-β-HVal-β-HAla-β-HLeu)2-OH (2) was prepared from the component L-β-amino acids by conventional peptide synthesis, including fragment coupling. A cyclo-β-tri- and a cyclo-β-hexapeptide were also prepared. The β-amino acids were obtained from α-amino acids by Arndt-Eistert homologation. All reactions leading to the β-peptides occur smoothly and in high yields. The β-peptides were

  通过常规肽合成，包括片段偶联，由组分L-β-氨基酸制备β-六肽（H-β-HVal-β-HAla-β-HLeu）2 -OH（2）。还制备了环-β-三-和环-β-六肽。β-氨基酸是通过Arndt-Eistert同源从α-氨基酸获得的。导致β肽的所有反应均平稳且高产率地进行。β肽的特征在于其CD和NMR光谱（COSY，ROESY，TOCSY和NOE限制建模），以及X射线晶体结构分析。β-Sheet型结构（固态）和紧凑的左手或（M）3 1发现了5Å螺距的螺旋（在溶液中）。与α-肽的类似二级结构的比较显示出基本的差异，在这一点上最令人惊讶的是β-肽螺旋的更大的稳定性。β-肽与β-羟基链烷酸的低聚物之间存在结构关系，两类化合物之间的差异证明了氢键的作用。β-六肽2在37° C的H 2 O中在pH 2的胃蛋白酶中稳定裂解至少60小时，而相应的α-肽H-（Val-Ala-Leu）2 -OH在这些条件下瞬间裂解。情况。讨论了所描述结果的含义。
• Synthesis of Aspartyl Pentapeptide Esters in Relation to Structural Features of Sweet Peptides
  作者：Yasuo Ariyoshi

  DOI：10.1246/bcsj.59.1027

  日期：1986.4

  A series of seven analogues of aspartyl pentapeptides has been synthesized in relation to the structural features of sweet peptides. The rule in the structure-taste relationships of di-, tri-, and tetrapeptides is inapplicable to the pentapeptides. All the pentapeptides were devoid of sweetness, though they satisfied the requirements for sweet peptides. The result indicates that oligopeptides can not fit a deep receptor pocket. The mode of interactions between sweet peptides and the receptor is drawn schematically.

  根据甜味肽的结构特征，合成了一系列七种天冬氨酰五肽类似物。二肽、三肽和四肽的结构-味道关系规则不适用于五肽。所有五肽都没有甜味，但它们满足了对甜味肽的要求。结果表明寡肽不能适合深受体袋。示意性地绘制了甜味肽和受体之间的相互作用模式。
• Decatungstate-Catalyzed C(sp³)–H Alkylation of a Val Residue Proximal to the N-Terminus Controlled by an Electrostatic Interaction
  作者：Jizhou Song、Takeru Torigoe、Yoichiro Kuninobu

  DOI：10.1021/acs.orglett.3c01154

  日期：2023.5.26

  valine methyl ester (H-Val-OMe·TFA) with electron-deficient alkenes under UV irradiation. The electrostatic interaction between the cationic ammonium group (+NH3) of the main chain and anionic [W10O32]4– played an important role in this reaction. The influence of various protected amino acids in the C(sp3)–H alkylation was investigated as the model reaction for the alkylation of Val-containing peptides

  十钨酸盐光催化剂[W 10 O 32 ] 4–在紫外光照射下有效促进缬氨酸甲酯三氟乙酸盐(H-Val-OMe·TFA) 与缺电子烯烃的C(sp 3 )–H 烷基化反应。主链的阳离子铵基（ + NH 3 ）与阴离子[W 10 O 32 ] 4–之间的静电相互作用在该反应中起着重要作用。C(sp 3 )中各种保护氨基酸的影响)-H 烷基化被研究作为含 Val 肽烷基化的模型反应。通过这种烷基化将炔烃部分引入 Val 是成功的，并证明了连续的铜催化叠氮化物-炔烃环加成 (CuAAC)。位于从 N 端算起第二个 Val 残基的C(sp 3 )–H 键也被成功转换。含有两个 Val 残基的寡肽的C(sp 3 )–H 烷基化选择性地靠近 N 末端进行。