(R)-1-methylpentyl propanoate

• 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: (R)-1-methylpentyl propanoate
• 英文别名: [(2R)-hexan-2-yl] propanoate
• 化学式: C₉H₁₈O₂
• 分子量: 158.241
• InChiKey: XOZXPRSBNBCWRN-MRVPVSSYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.8
• 重原子数：
  11
• 可旋转键数：
  6
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.89
• 拓扑面积：
  26.3
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为反应物：
  描述：

  2-戊醇 、 (R)-1-methylpentyl propanoate 在 Novozym 435 作用下， 生成 2-丙酸戊醇酯
  参考文献：
  名称：

  Enhancing the enantioselectivity of CALB by substrate imprinting: A combined experimental and molecular dynamics simulation model study

  摘要：

  Kinetic resolution of pentan-2-ol by CALB catalyzed enantioselective transesterification, with various alkylpropanoate acyl donors, was studied in a solid-gas reactor. Results show that the leaving alkoxy group influences the enantiomeric ratio of the reaction. Resolution of pentan-2-ol with methyl propanoate gives an enantiomeric ratio of 62. Esters with longer linear alkyl chains, from ethyl to pentyl propanoate give higher enantiomeric ratios, comprised between 103 and 117. Enantiopure ester (R)-1-methylpentyl propanoate increases the enantiomeric ratio to 140 compared with E = 120 for the racemic mixture. In contrast, enantiopure (S)-1-methylpentyl propanoate decreases the enantiomeric ratio to 72. Our data support the notion of an imprinting effect or "ligand-induced enzyme memory" caused by the shape of the leaving alcohol. To simulate the imprinting effect caused by the alkoxy part of the acyl donor, molecular modeling studies were performed with both (R)- and (S)-enantiopure 1-methylpentyl propanoate.To investigate how the first step of the reaction, through the first tetrahedral intermediate, affects the enzyme conformation depending on the enantiopure ester substrate used, 20 ns molecular dynamics simulations were carried out. Clustering analysis was done to study relevant conformations of the systems. Differences in the global conformation of the enzyme between systems with R or S enantiomers were not observed. Interestingly however, orientation of the partially buried side chain for IIe285 was affected. This could explain the increased enantiomeric ratio observed with the substrate ester (R)-1-methylpentyl propanoate due to an improved (R)-pentan-2-ol/enzyme interaction. (C) 2012 Elsevier B.V. All rights reserved.

  DOI：

  10.1016/j.molcatb.2012.04.017
• 作为产物：
  描述：

  (R)-(+)-1,2-环氧己烷 在 lithium aluminium tetrahydride 、 (R)-HBTM 、 N,N-二异丙基乙胺 作用下， 以 乙醚 、 氘代氯仿 为溶剂， 反应 2.5h， 生成 (R)-1-methylpentyl propanoate
  参考文献：
  名称：

  杂醇介导的仲醇酰化作用赋予绝对构型

  摘要：

  Birman的HBTM催化剂对苄基仲醇的对映选择性酰化和动力学拆分有效。对映选择性酰化现已扩展到带有吸电子基团的仲醇，例如卤化物和其他杂原子。选择性水平适中，足以使用竞争对映选择性转化方法确定构型。数学分析确定了实现最大转换差异的条件，因此，可以更有把握地分配配置。该新方法对卤代醇和仲1，2-叔二醇有效，并用于确认两种inoterpene天然产物的构型。

  DOI：

  10.1021/acs.joc.7b03156

文献信息

• Enantioselective Rh-Catalyzed Hydrogenation of Vinyl Carboxylates with Monodentate Phosphite Ligands
  作者：Manfred T. Reetz、Lukas J. Goossen、Andreas Meiswinkel、Jens Paetzold、Jakob Feldthusen Jensen

  DOI：10.1021/ol035076p

  日期：2003.8.1

  [reaction: see text] Alkyl-substituted vinylcarboxylates, which normally show poor enantioselectivity in Rh-catalyzed hydrogenation with traditional chiral diphosphines, undergo highly enantioselective reactions with BINOL- and carbohydrate-based monophosphite ligands.

  [反应：见正文]烷基取代的乙烯基羧酸盐通常在传统手性二膦的Rh催化加氢中表现出较差的对映选择性，并与BINOL和基于碳水化合物的单亚磷酸酯配体发生高度对映选择性的反应。