N-Isobutylidene (S) α Valine methylester | 19648-67-0

• 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-Isobutylidene (S) α Valine methylester
• 英文别名: methyl (2S)-3-methyl-2-(2-methylpropylideneamino)butanoate
• CAS: 19648-67-0
• 化学式: C₁₀H₁₉NO₂
• 分子量: 185.266
• InChiKey: SOAUWLMOOYKMBL-VIFPVBQESA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.3
• 重原子数：
  13
• 可旋转键数：
  5
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.8
• 拓扑面积：
  38.7
• 氢给体数：
  0
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  N-Isobutylidene (S) α Valine methylester 在 lithium aluminium tetrahydride 、 cerium(III) chloride 、 锌 作用下， 以 四氢呋喃 为溶剂， 反应 7.25h， 生成 (S)-2-(1-Isopropyl-but-3-enylamino)-3-methyl-butan-1-ol
  参考文献：
  名称：

  Enantioselective synthesis of homoallylic amines. Evidence of reversible addition of allylzinc bromide to aromatic imines derived from (S)-valine methyl ester and (S)-valinol

  摘要：

  由(S)-缬氨酸甲酯和(S)-缬氨醇衍生的芳香族和脂肪族亚胺与椰基溴和锌在四氢呋喃中反应，生成具有高达100%差异异构体过量（d.e.）的同烯丙胺，但在芳香族亚胺的情况下，随着反应时间的增加，差异选择性降低，这是由于烯丙基化反应的可逆性所致。

  DOI：

  10.1039/c39930001542
• 作为产物：
  描述：

  L-缬氨酸甲酯盐酸盐 、 异丁醛 在 magnesium sulfate 、 三乙胺 作用下， 以 四氢呋喃 为溶剂， 反应 3.0h， 生成 N-Isobutylidene (S) α Valine methylester
  参考文献：
  名称：

  Enantioselective Synthesis of Homoallylic Amines by Addition of Allylmetal Reagents to Imines Derived from (S)-Valine Esters

  摘要：

  Grignard and Barbier procedures have been applied to the addition of allylmetal (Zn, Cu, Pb, Bi, Al, In) species to imines derived from (S)-valine esters, principally the methyl ester. The Zn-mediated, CeCl3- or SnCl2-catalyzed ''Barbier'' reactions of the imines with allyl bromide in THF in Ar atmosphere at room temperature proved particularly convenient, efficient and selective, providing the secondary homoallylic amines with excellent to perfect diastereoselectivity. The si face of the imine was attacked preferentially in every case. The addition of allylzinc bromide to aromatic imines was affected by reversibility, which caused the lowering of the diastereoisomeric ratio with increasing the reaction time. However, the retroallylation reaction could be avoided by performing the reaction in the presence of trace amounts of water, or by using CeCl3.7H(2)O as the catalyst, although at the expense of the reaction rate. The bimetal redox systems Al-PbBr2, -SnCl2, -TiCl4, and -BiCl3 were applied to the allylation of the imines derived from methyl valinate, but satisfactory results were achieved only with Al-BiCl3 and -TiCl4 systems. However, the use of the Al(Hg) and Al-PbBr2 system afforded almost perfect chemo- and diastereoselectivity on the benzaldehyde imine derived from tert-butyl (S)-valinate. The synthesis of (S)-1-phenyl-3-butenamine from the corresponding secondary homoallylic amine was accomplished by a two-step sequence, consisting of the controlled reduction of the methyl ester with LiAlH4 and subsequent oxidative cleavage with H5IO6-MeNH(2).

  DOI：

  10.1021/jo00104a037

文献信息

• Unconjugated chiral azomethines; structure of N-isobutylidene derivatives of (S)-.ALPHA.-amino acid esters.
  作者：HIROSHI TAKAHASHI、HIROTAKA OTOMASU

  DOI：10.1248/cpb.26.466

  日期：——

  Unconjugated chiral azomethines, N-isobutylidene derivatives of (S)-α-amino acid esters (I-VI) were synthesized. The structures of these compounds were confirmed by the infrared, mass spectrum and nuclear magnetic resonance (NMR) spectra. The conformations were discussed by the NMR spectra. The characteristic absorption band for the unconjugated chiral azomethine compounds were observed nearly at 240 nm by the circular dichroism spectra.

  合成了非共轭手性偶氮甲碱、(S)-α-氨基酸酯(I-VI)的N-异丁烯衍生物。这些化合物的结构通过红外、质谱和核磁共振(NMR)谱得到证实。通过NMR谱讨论了构象。通过圆二色光谱在近 240 nm 处观察到非共轭手性偶氮甲碱化合物的特征吸收带。