Hexanoic acid, 3-[[(1,1-dimethylethoxy)carbonyl]amino]-2,2,5-trimethyl-,methyl ester, (3S)- | 499242-80-7

• 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: Hexanoic acid, 3-[[(1,1-dimethylethoxy)carbonyl]amino]-2,2,5-trimethyl-,methyl ester, (3S)-
• 英文别名: (S)-3-tert-Butoxycarbonylamino-2,2,5-trimethyl-hexanoic acid methyl ester
• CAS: 499242-80-7
• 化学式: C₁₅H₂₉NO₄
• 分子量: 287.4
• InChiKey: NLWXLCIDYXMUIO-NSHDSACASA-N

物化性质

• 沸点：
  366.4±25.0 °C(Predicted)
• 密度：
  0.981±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  3.13
• 重原子数：
  20.0
• 可旋转键数：
  5.0
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.87
• 拓扑面积：
  64.63
• 氢给体数：
  1.0
• 氢受体数：
  4.0

反应信息

• 作为反应物：
  描述：

  Hexanoic acid, 3-[[(1,1-dimethylethoxy)carbonyl]amino]-2,2,5-trimethyl-,methyl ester, (3S)- 在 sodium hydroxide 作用下， 以 甲醇 为溶剂， 反应 12.0h， 生成 (S)-3-tert-Butoxycarbonylamino-2,2,5-trimethyl-hexanoic acid
  参考文献：
  名称：

  CD Spectra in Methanol ofβ-Oligopeptides Consisting ofβ-Amino Acids with Functionalized Side Chains, with Alternating Configuration, and with Geminal Backbone Substituents - Fingerprints of New Secondary Structures?

  摘要：

  beta -Hexa-, beta -hepta-, and beta -nonapeptides, 1-6, which carry functionalized side chains (CO(2)R, CO(2)(-), (CH(2))(4)NH(3)(+), CH(2)-CH=CH(2)) consisting of beta (3)-amino-acid residues of alternating configuration, or which carry geminal substituents in the 2- or 3-positions of all residues, have been synthesized (Schemes 1 - 3), and their CD spectra in MeOH are reported (Figs. 2 - 6). Strong Cotton effects (Theta >10(5)) are indicative of the presence of chiral secondary structures. It is suggested by simple modelling (Fig. 1) that the new beta -peptides should not be able to fold to the familiar 3(14)-helical structures. Still, three of them (3, 4, and 5) give rise to CD spectra matching those of beta -peptides that are known to be present as (M)- or (P)3(14)-helices in MeOH solution. While possible folding motifs (Figs. 3, b, and 7) of the new beta -peptides have been identified in crystal structures, an interpretation of the CD spectra has to be postponed until NMR solution structures become available. A list of all beta -peptides giving rise to CD spectra with a minimum near 215 nm is included (Table).

  DOI：

  10.1002/1522-2675(20001108)83:11<2849::aid-hlca2849>3.0.co;2-r
• 作为产物：
  描述：

  methyl (2R,3S)-3-{[(tert-butoxy)carbonyl]amino}-2,5-dimethylhexanoate 、 碘甲烷 在 lithium diisopropyl amide 作用下， 以 四氢呋喃 为溶剂， 反应 6.5h， 以75%的产率得到Hexanoic acid, 3-[[(1,1-dimethylethoxy)carbonyl]amino]-2,2,5-trimethyl-,methyl ester, (3S)-
  参考文献：
  名称：

  摘要：

  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).

  DOI：

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