N-(tert-butoxycarbonyl)-valyl-alanyl-leucine | 161083-59-6

• 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-(tert-butoxycarbonyl)-valyl-alanyl-leucine
• 英文别名: Boc-Val-Ala-Leu-OH
• CAS: 161083-59-6
• 化学式: C₁₉H₃₅N₃O₆
• 分子量: 401.503
• InChiKey: NYZUCSMQECCLBR-IHRRRGAJSA-N

物化性质

• 沸点：
  639.704±50.00 °C(Press: 760.00 Torr)(predicted)
• 密度：
  1.106±0.06 g/cm3(Temp: 25 °C; Press: 760 Torr)(predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  1.66
• 重原子数：
  28.0
• 可旋转键数：
  9.0
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.79
• 拓扑面积：
  133.83
• 氢给体数：
  4.0
• 氢受体数：
  5.0

反应信息

• 作为反应物：
  描述：

  N-(tert-butoxycarbonyl)-valyl-alanyl-leucine 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：

  L-亮氨酸苄酯对甲苯磺酸盐 在 palladium on activated charcoal N-甲基吗啉 、 盐酸 、 氢气 、 氯甲酸异丁酯 作用下， 以 甲醇 、 乙醚 为溶剂， 反应 48.33h， 生成 N-(tert-butoxycarbonyl)-valyl-alanyl-leucine
  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

• Application of carbodiimide mediated Lossen rearrangement for the synthesis of α-ureidopeptides and peptidyl ureas employing N-urethane α-amino/peptidyl hydroxamic acids
  作者：N. Narendra、Gundala Chennakrishnareddy、Vommina V. Sureshbabu

  DOI：10.1039/b905790k

  日期：——

  Application of the Lossen rearrangement to the synthesis of N-urethane protected α-peptidyl ureas and ureidopeptides is reported. The carbodiimide mediated rearrangement of N-Boc/Z/Fmoc protected α-amino/peptide hydroxamic acids into isocyanates and coupling of the latter with the amino acid esters/peptide esters have been accomplished in a single-pot to obtain good yields of urea products. Synthesis

  报道了Lossen重排在N-氨基甲酸酯保护的α-肽基脲和脲肽的合成中的应用。这碳二亚胺N- Boc / Z / Fmoc保护的α-氨基/肽异羟肟酸介导的重排成异氰酸酯，后者与氨基酸酯/肽酯的偶联已在单罐中完成，从而获得了较高的收率。尿素产品。还已经使用相同的方法经由N-保护的天冬氨酸的异羟肟酸酯衍生物合成脲基丙氨酸衍生物。
• 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
• C-Alkylation of Peptides Containing Aminomalonate and (Amino)(cyano)acetate Residues
  作者：Thomas Matt、Dieter Seebach

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

  日期：1998.10.7

  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.