2-methyl-3-(2,6,6-trimethyl-cyclohex-1-enyl)-acrylaldehyde | 165605-03-8

• 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: 2-methyl-3-(2,6,6-trimethyl-cyclohex-1-enyl)-acrylaldehyde
• 英文别名: α-Cyclocitryliden-propionaldehyd；1.1.3-Trimethyl-2-(2²-metho-propen-(2¹)-ylal-(2³))-cyclohexen-(2)；(E)-2-methyl-3-(2,6,6-trimethylcyclohexen-1-yl)prop-2-enal
• CAS: 165605-03-8
• 化学式: C₁₃H₂₀O
• 分子量: 192.301
• InChiKey: TUMCYGNUZWASNI-CSKARUKUSA-N

物化性质

• 沸点：
  286.9±9.0 °C(Predicted)
• 密度：
  0.944±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  3.1
• 重原子数：
  14
• 可旋转键数：
  2
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.62
• 拓扑面积：
  17.1
• 氢给体数：
  0
• 氢受体数：
  1

反应信息

• 作为反应物：
  描述：

  2-methyl-3-(2,6,6-trimethyl-cyclohex-1-enyl)-acrylaldehyde 在 chromium dichloride 、 manganese(IV) oxide 、 四(三苯基膦)钯 、 氢氧化铊(Ⅰ) 作用下， 以 四氢呋喃 、 二氯甲烷 为溶剂， 反应 10.0h， 生成 (2E,4E,6E,8E)-3,8-Dimethyl-9-(2,6,6-trimethyl-cyclohex-1-enyl)-nona-2,4,6,8-tetraenal
  参考文献：
  名称：

  Experimental and Theoretical Analysis of the Steric Tolerance of the Binding Site of Bacterioopsin with the Use of Side-Chain Methyl-Shifted Retinal Analogs

  摘要：

  Four positional isomers of trans-retinal (1) differing in the location of the side-chain methyl groups have been prepared by a combination of Wittig and highly stereocontrolled Suzuki coupling reactions. The incubation of 9-demethyl-10-methylretinal (5) with bacterioopsin yielded an artificial pigment with an opsin shift of 4630 cm(-1) The other three analogs, namely 13-demethyl-14-methylretinal (3), 13-demethyl-12-methylretinal (4), and 9-demethyl-8-methylretinal (6) did not bind to the apoprotein. In order to rationally address the intrinsic structural differences among analogs which could be relevant to the discrimination exhibited by the protein binding site, ab initio calculations with complete optimization at the 3-21G level were performed on model N-methylretinal iminium salts derived from aldehydes 1 and 3-6. The validity of the approach was inferred from the remarkable coincidence between the minimized structure of N-methylretinal Schiff base (PSB-1) and the structural parameters displayed by N-methyl-N-phenylretinal iminium perchlorate (38b). Computations clearly show that the location of the methyl groups on the polyene side chain is of the utmost importance in determining the overall shape of the retinal ligands. Those structural effects, added to the dominant steric and electronic restrictions of the binding pocket, would explain the observed discrimination among the analogs 3-6, with minor structural changes, and perhaps among other retinals reported in the literature. Additionally, the theoretical and experimental results obtained with 9-demethyl-8-methylretinal (6) provide further indirect evidence of the importance of the 6-s-trans conformation for the native chromophore in bacteriorhodopsin.

  DOI：

  10.1021/ja00136a021
• 作为产物：
  描述：

  2,5,9-三甲基-2,4,8-癸三烯醛 在 硫酸 作用下， 生成 2-methyl-3-(2,6,6-trimethyl-cyclohex-1-enyl)-acrylaldehyde
  参考文献：
  名称：

  Barbier, Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences, 1907, vol. 144, p. 1442

  摘要：

  DOI：

文献信息

• Synthesis, olfactory evaluation and determination of the absolute configuration of the β- and γ-Iralia® isomers
  作者：Assem Barakat、Elisabetta Brenna、Claudio Fuganti、Stefano Serra

  DOI：10.1016/j.tetasy.2008.09.028

  日期：2008.10

  synthesis of the methyl-ionone isomers 6–9 is described. The enantiomers of the γ-isomers 8 and 9 are prepared by enzyme-mediated resolution of the corresponding 4-hydroxy derivatives followed by reductive elimination of the hydroxy group. The absolute configuration of the latter compound is determined by chemical correlation with the known α-isomers. Since all the isomers obtained are components of the

  甲基紫罗兰酮异构体的区域选择性合成6 - 9进行说明。γ-异构体8和9的对映异构体是通过酶介导的相应的4-羟基衍生物的拆分，然后还原性消除羟基而制备的。后一种化合物的绝对构型通过与已知的α-异构体的化学相关性确定。由于所有获得的异构体下Iralia的商品名人工紫罗兰增味剂的成分®，它们的气味性质是由调香师的专业评估。