(S)-methyl 3-hydroxy-5-methylhexanoate | 184958-22-3

• 分子结构分类: 有机化合物 - 有机酸及其衍生物 - 羟基酸及其衍生物
• 英文名称: (S)-methyl 3-hydroxy-5-methylhexanoate
• 英文别名: methyl (3S)-3-hydroxy-5-methylhexanoate
• CAS: 184958-22-3
• 化学式: C₈H₁₆O₃
• 分子量: 160.213
• InChiKey: SFJDGEXPYKDGTD-ZETCQYMHSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.1
• 重原子数：
  11
• 可旋转键数：
  5
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.88
• 拓扑面积：
  46.5
• 氢给体数：
  1
• 氢受体数：
  3

反应信息

• 作为产物：
  描述：

  (2R,3S)-3-Hydroxy-5-methyl-2-methylsulfanyl-hexanoic acid methyl ester 在 Raney nickel W-2 作用下， 以 丙酮 为溶剂， 反应 0.33h， 生成 (S)-methyl 3-hydroxy-5-methylhexanoate
  参考文献：
  名称：

  Efficient Enantioselective Synthesis of Methyl Esters of α-Unsubstituted β-Hydroxy Acids via Asymmetric Aldol-Type Addition of Chiral Boron Enolates of (Methylthio)acetic Acid to Aldehydes

  摘要：

  (甲硫基)乙酸的手性硼烯醇盐与各种醛进行aldol型加成反应，可以立体选择性地并以良好产率得到α-(甲硫基)-β-羟基酸。通过脱硫作用，可以将缩合加合物的甲酯转化为高对映体纯度的α-未取代-β-羟基酸的甲酯。使用(+)-2-蒎烯和(+)-3-蒎烯的衍生物作为手性诱导剂。aldol型加成的对映选择性和非对映选择性有效地受到烯醇盐α-位上的SMe基团和所用手性配体类型的控制。

  DOI：

  10.1055/s-1996-4365

文献信息

• Over 98% Optical Yield Achieved by a Heterogeneous Catalysis. Substrate Design and Analysis of Enantio-Differentiating Factors of Tartaric Acid-Modified Raney Nickel Hydrogenation
  作者：Takashi Sugimura、Satoshi Nakagawa、Akira Tai

  DOI：10.1246/bcsj.75.355

  日期：2002.2

  Tartaric acid-modified Raney nickel (TA-MRNi) is a chiral heterogeneous catalyst for the hydrogenation of prochiral ketones. An optical yield (OY) of 86% with methyl acetoacetate (1) as a substrate was improved to 94–96% by employing β-keto esters having a proper bulkiness at the γ -position. The γ -bulkiness effect contributes to a high intrinsic enantio-differentiating ability (factor-i) of the TA-MRNi catalysis. Through the study, we found the best substrate, γ -cyclopropyl-β-keto ester, the hydrogenation of which resulted in 98.6% OY. This further improvement in the OY was ascribed to a smaller contribution of non-enantio-differentiating hydrogenation (N-site catalysis) due to the substrate-specific activation of the enantio-differentiating hydrogenation by the chiral modifier. The OY of the hydrogenation of 1 was analyzed by comparing with well-behaved β-keto esters, and the contribution of the factor-i and the N-site to the OY value was evaluated to deduce the origin of the enantiodifferentiation.

  酒石酸改性的Raney镍(TA-MRNi)是一种手性非均相催化剂，用于前手性酮的氢化反应。以乙酰乙酸甲酯(1)为底物，光学收率(OY)为86%，当采用在γ位置具有适当体积的β-酮酯时，OY提高至94-96%。γ体积效应有助于TA-MRNi催化剂具有高固有的手性区分能力(因子-i)。通过研究，我们发现最佳底物，即γ-环丙基-β-酮酯，其氢化反应的光学收率达到了98.6%。这一光学收率的进一步提升归因于底物特定的手性修饰剂激活手性区分氢化反应，从而减少了非手性区分氢化(N-位点催化)的贡献。通过与表现良好的β-酮酯进行比较，分析了1氢化反应的OY，并评估了因子-i和N-位点对OY值的贡献，从而推导出手性区分的起源。
• Efficient Enantioselective Synthesis of Methyl Esters of α-Unsubstituted β-Hydroxy Acids via Asymmetric Aldol-Type Addition of Chiral Boron Enolates of (Methylthio)acetic Acid to Aldehydes
  作者：Francesco Fringuelli、Oriana Piermatti、Ferdinando Pizzo

  DOI：10.1055/s-1996-4365

  日期：1996.10

  The aldol-type addition of chiral boron enolates of (methylthio)-acetic acid to various aldehydes gives α-(methylthio)-β-hydroxy acids stereoselectively and with good yields. The desulfenylation of methyl esters of the condensation adducts allows methyl esters of α-unsubstituted β-hydroxy acids to be obtained with high ee. Derivatives of (+)-2- and (+)-3-carene were used as chiral inducers. The enantioselectivity and diastereoselectivity of the aldol-type addition are efficaciously controlled by the SMe group in the α-position of the enolate and by the type of chiral ligand used.

  (甲硫基)乙酸的手性硼烯醇盐与各种醛进行aldol型加成反应，可以立体选择性地并以良好产率得到α-(甲硫基)-β-羟基酸。通过脱硫作用，可以将缩合加合物的甲酯转化为高对映体纯度的α-未取代-β-羟基酸的甲酯。使用(+)-2-蒎烯和(+)-3-蒎烯的衍生物作为手性诱导剂。aldol型加成的对映选择性和非对映选择性有效地受到烯醇盐α-位上的SMe基团和所用手性配体类型的控制。