Boc-β2,2-HAib-β2,2-HAib-β2,2-HAib-OH | 220145-08-4

• 分子结构分类: 有机化合物 - 脂质和类脂质分子 - 脂肪酰基
• 英文名称: Boc-β2,2-HAib-β2,2-HAib-β2,2-HAib-OH
• 英文别名: Boc-β^2,2-HAib-β^2,2-HAib-β^2,2-HAib-OH
• CAS: 220145-08-4
• 化学式: C₂₀H₃₇N₃O₆
• 分子量: 415.53
• InChiKey: IGJJLNRPIADVQI-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.91
• 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：
  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：

  Boc-β2,2-HAib-β2,2-HAib-β2,2-HAib-OH 在 1-羟基苯并三唑 、 1-(3-二甲基氨基丙基)-3-乙基碳二亚胺 、 三乙胺 作用下， 以 氯仿 为溶剂， 反应 32.0h， 生成 Boc-β^2,2-HAib-β^2,2-HAib-β^2,2-HAib-β^2,2-HAib-β^2,2-HAib-β^2,2-HAib-β^2,2-HAib-β^2,2-HAib-β^2,2-HAib-OMe
  参考文献：
  名称：

  Preparation and Structure ofβ-Peptides Consisting of Geminally Disubstitutedβ2,2- andβ3,3-Amino Acids: A Turn Motif forβ-Peptides

  摘要：

  We report on the synthesis of new and previously described beta-peptides (1-6), consisting of up to twelve beta(2,2-) or beta(3,3)-geminally disubstituted beta-amino acids which do not fit into any of the secondary structural patterns of beta-peptides, hitherto disclosed. The required 2,2- and 3,3-dimethyl derivatives of 3-aminopropanoic acid are readily obtained from 3-methylbut-2-enoic acid and ammonia (Scheme 1) and from Boc-protected methyl 3-aminopropanoate by enolate methylation (Scheme 2). Protected (Boc for solution-, Fmoc for solid-phase syntheses) 1-(aminomethyl)cycloalkanecarboxylic-acid derivatives (with cyclopropane, cyclobutane, cyclopentane, and cyclohexane rings) are obtained from 1-cyanocycloalkanecarboxylates and the corresponding dihaloalkanes (Scheme 3). Fully C-13- and N-15-labeled 3-amino-2,2-dimethylpropanoic-acid derivatives were prepared from the corresponding labeled precursors (see asterixed formula numbers and Scheme 4). Coupling of these amino acids was achieved by methods which we had previously employed for other beta-peptide syntheses ( intermediates 18 - 23). Crystal structures of Boc-protected geminally disubstituted amine acids (16a-d) and of the corresponding tripeptide (23a), as well as NMR and IR spectra of an isotopically labeled beta-hexapeptide (2a*) are presented (Figs. 1-4) and discussed. The tripeptide structure contains a ten-membered H-bonded ring which is proposed to be a turn-forming motif for beta-peptides (Fig. 2).

  DOI：

  10.1002/(sici)1522-2675(19981216)81:12<2218::aid-hlca2218>3.0.co;2-0
• 作为产物：
  描述：

  3-((叔丁氧基羰基)氨基)-2,2-二甲基丙酸 在 sodium hydroxide 、 1-羟基苯并三唑 、 1-(3-二甲基氨基丙基)-3-乙基碳二亚胺 、 三乙胺 作用下， 以 甲醇 、 氯仿 为溶剂， 反应 31.0h， 生成 Boc-β2,2-HAib-β2,2-HAib-β2,2-HAib-OH
  参考文献：
  名称：

  Preparation and Structure ofβ-Peptides Consisting of Geminally Disubstitutedβ2,2- andβ3,3-Amino Acids: A Turn Motif forβ-Peptides

  摘要：

  We report on the synthesis of new and previously described beta-peptides (1-6), consisting of up to twelve beta(2,2-) or beta(3,3)-geminally disubstituted beta-amino acids which do not fit into any of the secondary structural patterns of beta-peptides, hitherto disclosed. The required 2,2- and 3,3-dimethyl derivatives of 3-aminopropanoic acid are readily obtained from 3-methylbut-2-enoic acid and ammonia (Scheme 1) and from Boc-protected methyl 3-aminopropanoate by enolate methylation (Scheme 2). Protected (Boc for solution-, Fmoc for solid-phase syntheses) 1-(aminomethyl)cycloalkanecarboxylic-acid derivatives (with cyclopropane, cyclobutane, cyclopentane, and cyclohexane rings) are obtained from 1-cyanocycloalkanecarboxylates and the corresponding dihaloalkanes (Scheme 3). Fully C-13- and N-15-labeled 3-amino-2,2-dimethylpropanoic-acid derivatives were prepared from the corresponding labeled precursors (see asterixed formula numbers and Scheme 4). Coupling of these amino acids was achieved by methods which we had previously employed for other beta-peptide syntheses ( intermediates 18 - 23). Crystal structures of Boc-protected geminally disubstituted amine acids (16a-d) and of the corresponding tripeptide (23a), as well as NMR and IR spectra of an isotopically labeled beta-hexapeptide (2a*) are presented (Figs. 1-4) and discussed. The tripeptide structure contains a ten-membered H-bonded ring which is proposed to be a turn-forming motif for beta-peptides (Fig. 2).

  DOI：

  10.1002/(sici)1522-2675(19981216)81:12<2218::aid-hlca2218>3.0.co;2-0

文献信息

• ——
  作者：Dieter Seebach、Thierry Sifferlen、Daniel J. Bierbaum、Magnus Rueping、Bernhard Jaun、Bernd Schweizer、Jacob Schaefer、Anil K. Mehta、Robert D. O'Connor、Beat H. Meier、Matthias Ernst、Alice Glättli

  DOI：10.1002/1522-2675(200209)85:9<2877::aid-hlca2877>3.0.co;2-w

  日期：2002.9

  The preparation of (S)-beta(2.2.3) -amino acids with two Me groups in the a-position and the side chains of Ala, Val, and Len in the P-position (double methylation of Boc-beta-HAla-OMe, Boc-beta-Val-OMe, and Boc-beta-LeuOMe, Scheme 2) is described. These beta-amino acids and unlabelled as well as specifically C-13- and (15)labelled 2,2-dimethyl-3-amino acid (beta(2.2)-HAib) derivatives have been coupled in solution (Schemes 1, 3 and 4) to give protected (N-Boc, C-OMe), partially protected (N-Boc/C-OH, N-H/C-OMe), and unprotected beta(2.2) - and beta(2.2.3)- hexapeptides, and beta(2.2) and beta(2.2.3)-heptapeptides 1-7. NMR Analyses in solution (Tables 1 and 2, and Figs. 2-4) and in the solid state (2D-MAS NMR measurements of the fully labelled BOC-(beta(2.2)-HAib)(6)-OMe ([C-13(30), N-15(6)]-1e; Fig. 5), and TEDOR/REDOR NMR investigations of mixtures (Fig. 6) of the unlabelled AC-([beta(2.2)-HAib)(7)- OMe (4) and of a labelled derivative ([C-13(4),N-15(2)]-5; Figs. 7- 11, and 19), a molecular-modeling study (Figs. 13 15), and a search in the Cambridge Crystallographic Data Base (Fig. 16) allow the following conclusions: i) there is no evidence for folding (helix or turn) or for aggregation to sheets of the geminally dimethyl substituted peptide chains in solution; ii) there are distinct conformational preferences of the individual beta(2.2) and beta(2.2.3)-amino acid residues: close to eclipsing around the C(O) - C(Me-2(CHR)) bond (tau(1.2)), almost perfect staggering around the C(2)-C(3) ethane bond (tau(2,3)), and antiperiplanar arrangement of H(C3) and H(N) (TIN; Fig. 12) in the solid state; iii) the beta(2,2)-peptides may be part of a turn structure with a ten-membered H-bonded ring; iv) the main structure present in the solid state of F3CCO(beta(2,2) -HAib)(7)-OMe is a nonfolded chain (>30 Angstrom between the termini and >20 Angstrom between the N-terminus and the CH2 group of residue 5) with all C = O bonds in a parallel alignment (+/-10degrees). With these structural parameters, a simple modelling was performed producing three (maybe four) possible chain geometries: one fully extended, two with parallel peptide planes (with zick-zack and crankshaft-type arrangement of the peptide bonds). and (possibly) a fourth with meander-like winding (D-G in Figs. 17 and 18).