(S)-2-(2-phenylpent-4-en-2-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane | 1201898-77-2

• 分子结构分类: 有机化合物 - 苯类化合物 - 苯和取代衍生物
• 英文名称: (S)-2-(2-phenylpent-4-en-2-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane
• 英文别名: 4,4,5,5-tetramethyl-2-[(2S)-2-phenylpent-4-en-2-yl]-1,3,2-dioxaborolane
• CAS: 1201898-77-2
• 化学式: C₁₇H₂₅BO₂
• 分子量: 272.195
• InChiKey: URRWPULOBVMHIT-QGZVFWFLSA-N

物化性质

• 沸点：
  324.7±31.0 °C(Predicted)
• 密度：
  0.96±0.1 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  4.15
• 重原子数：
  20
• 可旋转键数：
  4
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.53
• 拓扑面积：
  18.5
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为反应物：
  描述：

  (S)-2-(2-phenylpent-4-en-2-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane 在 正丁基锂 、 二异丙胺 作用下， 以 四氢呋喃 、 乙醚 、 正己烷 、 正戊烷 为溶剂， 反应 17.75h， 生成 (1S,3E,5S)-5-methyl-1,5-diphenylocta-3,7-dien-1-ol
  参考文献：
  名称：

  Highly Diastereo- and Enantioselective Allylboration of Aldehydes using α-Substituted Allyl/Crotyl Pinacol Boronic Esters via in Situ Generated Borinic Esters

  摘要：

  Readily available, alpha-substituted allyl/crotyl pinacol boronic esters often give low E/Z selectivity (with Z favored) in reactions with aldehydes. We found that addition of nBuLi to the pinacol boronic ester followed by trapping of the alkoxide with TFAA leads to an intermediate allyl borinic ester which undergoes allylboration with very high E selectivity. The substrate scope includes primary to tertiary alkyl alpha-substituents, crotyl substrates, and the previously unreported beta-methallyl pinacol boronic esters. The latter give very high Z selectivity under standard conditions which is completely reversed to high E selectivity under the new conditions. Monitoring the reaction by B-11 NMR confirmed that the reaction proceeds through a borinic ester intermediate.

  DOI：

  10.1021/ja401564z
• 作为产物：
  描述：

  烯丙基硼酸频哪醇酯 、 (S)-1-phenylethyl diisopropylcarbamate 在 s-C₄H₉Li 、 tetramethylethylenediamine 作用下， 以 乙醚 为溶剂， 以91%的产率得到(S)-2-(2-phenylpent-4-en-2-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane
  参考文献：
  名称：

  叔硼酸酯的原脱硼化：叔烷基立体中心的不对称合成

  摘要：

  虽然叔硼烷与羧酸进行有效的原脱硼反应，但叔硼酸酯不会。相反，我们发现 CsF 与 1.1 当量的 H2O（在叔二芳基烷基硼酸酯上）或 TBAF·3H2O（在叔芳基二烷基硼酸酯上）实现了叔硼酸酯的高效原脱硼，并且基本上完全保留了构型。此外，用 D2O 代替 H2O 可以方便地获得氘标记的对映体富集的叔烷烃。该方法已应用于倍半萜烯（S）-姜黄酮的短合成。

  DOI：

  10.1021/ja1084207

文献信息

• Improved method for the conversion of pinacolboronic esters into trifluoroborate salts: facile synthesis of chiral secondary and tertiary trifluoroborates
  作者：Viktor Bagutski、Abel Ros、Varinder K. Aggarwal

  DOI：10.1016/j.tet.2009.10.002

  日期：2009.11

  A general method for the preparation of virtually any potassium trifluoroborate salt from the corresponding pinacolboronic ester is reported. Thus, conditions for an azeotropic removal of pinacol from the reaction mixture were found to afford the desired potassium trifluoroborates of sufficient purity (>95%) in nearly quantitative yields irrespective of the nature of the product. The utility of this

  报道了从相应的频哪醇硼酸酯制备几乎任何三氟硼酸钾盐的通用方法。因此，发现从反应混合物中共沸除去频哪醇的条件以几乎定量的产率提供了具有足够纯度（＞ 95％）的所需三氟硼酸钾，而与产物的性质无关。通过制备大量对映体富集的仲和叔三氟硼酸钾说明了该方法的实用性。
• Enantiospecific Alkynylation of Alkylboronic Esters
  作者：Yahui Wang、Adam Noble、Eddie L. Myers、Varinder K. Aggarwal

  DOI：10.1002/anie.201600599

  日期：2016.3.18

  Enantioenriched secondary and tertiary alkyl pinacolboronic esters undergo enantiospecific deborylative alkynylation through a Zweifel‐type alkenylation followed by a 1,2‐elimination reaction. The process involves use of α‐lithio vinyl bromide or vinyl carbamate species, for which application to Zweifel‐type reactions has not previously been explored. The resulting functionalized 1,1‐disubstituted

  富含对映体的仲和叔烷基频哪醇硼酸酯通过Zweifel型烯基化反应进行对映体脱硼烷基化炔基化反应，然后进行1,2-消除反应。该过程涉及使用α-硫代乙烯基溴化物或氨基甲酸乙烯基酯，以前尚未探索过将其用于Zweifel型反应。所得官能化的1,1-二取代烯烃经过简便的碱介导消除，可在多种频哪醇硼酸酯底物上以高收率和优异的对映体特异性水平生成末端炔烃产物。此外，与末端炔烃一起，可以在碱介导的1,2-消除反应后简单地引入合适的基于碳或硅的亲电试剂来形成内部和甲硅烷基保护的炔烃。
• Enantioselective Construction of Quaternary Stereogenic Centers from Tertiary Boronic Esters: Methodology and Applications
  作者：Ravindra P. Sonawane、Vishal Jheengut、Constantinos Rabalakos、Robin Larouche-Gauthier、Helen K. Scott、Varinder K. Aggarwal

  DOI：10.1002/anie.201008067

  日期：2011.4.11

  that bear versatile functional groups with quaternary stereogenic centers have been prepared with very high enantioselectivity from tertiary boronic esters (see scheme; Cb=N,N‐diisopropylcarbamoyl, pin=pinacolato). The preparation of allylboronic esters bearing contiguous quaternary and tertiary stereogenic centers, and applications to natural product synthesis are also reported.

  固定下来：一系列具有四元立体中心的多功能官能团的底物已经由叔硼酸酯制备，具有非常高的对映选择性（参见方案；Cb = N，N-二异丙基氨基甲酰基，pin = pinacolato）。还报道了具有连续季和叔立体中心的烯丙基硼酸酯的制备，以及在天然产物合成中的应用。
• Protodeboronation of Tertiary Boronic Esters: Asymmetric Synthesis of Tertiary Alkyl Stereogenic Centers
  作者：Stefan Nave、Ravindra P. Sonawane、Tim G. Elford、Varinder K. Aggarwal

  DOI：10.1021/ja1084207

  日期：2010.12.8

  tertiary boranes undergo efficient protodeboronation with carboxylic acids, tertiary boronic esters do not. Instead, we have discovered that CsF with 1.1 equiv of H2O (on tertiary diarylalkyl boronic esters) or TBAF·3H2O (on tertiary aryldialkyl boronic esters) effect highly efficient protodeboronation of tertiary boronic esters with essentially complete retention of configuration. Furthermore, substituting

  虽然叔硼烷与羧酸进行有效的原脱硼反应，但叔硼酸酯不会。相反，我们发现 CsF 与 1.1 当量的 H2O（在叔二芳基烷基硼酸酯上）或 TBAF·3H2O（在叔芳基二烷基硼酸酯上）实现了叔硼酸酯的高效原脱硼，并且基本上完全保留了构型。此外，用 D2O 代替 H2O 可以方便地获得氘标记的对映体富集的叔烷烃。该方法已应用于倍半萜烯（S）-姜黄酮的短合成。
• Highly Diastereo- and Enantioselective Allylboration of Aldehydes using α-Substituted Allyl/Crotyl Pinacol Boronic Esters via in Situ Generated Borinic Esters
  作者：Jack L.-Y. Chen、Helen K. Scott、Matthew J. Hesse、Christine L. Willis、Varinder K. Aggarwal

  DOI：10.1021/ja401564z

  日期：2013.4.10

  Readily available, alpha-substituted allyl/crotyl pinacol boronic esters often give low E/Z selectivity (with Z favored) in reactions with aldehydes. We found that addition of nBuLi to the pinacol boronic ester followed by trapping of the alkoxide with TFAA leads to an intermediate allyl borinic ester which undergoes allylboration with very high E selectivity. The substrate scope includes primary to tertiary alkyl alpha-substituents, crotyl substrates, and the previously unreported beta-methallyl pinacol boronic esters. The latter give very high Z selectivity under standard conditions which is completely reversed to high E selectivity under the new conditions. Monitoring the reaction by B-11 NMR confirmed that the reaction proceeds through a borinic ester intermediate.