2-(2-(4-methoxyphenyl)butan-2-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane | 1257661-31-6

• 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: 2-(2-(4-methoxyphenyl)butan-2-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane
• CAS: 1257661-31-6
• 化学式: C₁₇H₂₇BO₃
• 分子量: 290.211
• InChiKey: PDNYGTBKHVOZNX-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  3.99
• 重原子数：
  21.0
• 可旋转键数：
  4.0
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.65
• 拓扑面积：
  27.69
• 氢给体数：
  0.0
• 氢受体数：
  3.0

反应信息

• 作为反应物：
  描述：

  2-(2-(4-methoxyphenyl)butan-2-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane 在 双氧水 、 sodium hydroxide 作用下， 以 四氢呋喃 为溶剂， 反应 2.0h， 以50 mg的产率得到2-(4-甲氧基苯基)-2-丁醇
  参考文献：
  名称：

  Enantioselective α-Arylation of O-Carbamates via Sparteine-Mediated Lithiation and Negishi Cross-Coupling

  摘要：

  A general and enantioselective arylation of carbamates derived from primary alcohols was developed by combining Hoppe's sparteine-mediated asymmetric lithiation with Negishi cross-coupling. Coupled with Aggarwal's lithiation-borylation sequence, the current method provides a short and divergent access to a variety of enantioenriched secondary and tertiary benzylic alcohols.

  DOI：

  10.1021/acs.orglett.6b03472
• 作为产物：
  描述：

  乙基硼酸频那醇酯 、 1-(4-methoxyphenyl)ethyl 2,2,4,4-tetramethyloxazolidine-3-carboxylate 在 四甲基乙二胺 、 仲丁基锂 作用下， 以 乙醚 为溶剂， 反应 2.41h， 生成 2-(2-(4-methoxyphenyl)butan-2-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane
  参考文献：
  名称：

  Enantioselective α-Arylation of O-Carbamates via Sparteine-Mediated Lithiation and Negishi Cross-Coupling

  摘要：

  A general and enantioselective arylation of carbamates derived from primary alcohols was developed by combining Hoppe's sparteine-mediated asymmetric lithiation with Negishi cross-coupling. Coupled with Aggarwal's lithiation-borylation sequence, the current method provides a short and divergent access to a variety of enantioenriched secondary and tertiary benzylic alcohols.

  DOI：

  10.1021/acs.orglett.6b03472

文献信息

• Transition‐Metal‐Free Cross‐Coupling by Using Tertiary Benzylic Organoboronates
  作者：Mitsutaka Takeda、Kazunori Nagao、Hirohisa Ohmiya

  DOI：10.1002/anie.202010251

  日期：2020.12.7

  The transition‐metal‐free cross‐coupling of alkyl or aryl electrophiles by using tertiary benzylic organoboronates is reported. This reaction involves the generation of tertiary alkyl anions from organoboronates in the presence of an alkoxide base and then their substitution reactions. This protocol allows the simple and efficient construction of quaternary carbon centers.

  据报道，使用叔苄基有机硼酸酯可实现烷基或芳基亲电试剂的无过渡金属交叉偶联。该反应包括在醇盐碱的存在下由有机硼酸酯生成叔烷基阴离子，然后进行取代反应。该协议允许简单有效地构建季碳中心。
• 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·3 （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 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。