3,4-dimethoxyphenylboroxine

• 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: 3,4-dimethoxyphenylboroxine
• 英文别名: 2,4,6-Tris(3,4-dimethoxyphenyl)-1,3,5,2,4,6-trioxatriborinane
• 化学式: C₂₄H₂₇B₃O₉
• 分子量: 491.906
• InChiKey: FTSHTTUDJJPJHV-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.29
• 重原子数：
  36
• 可旋转键数：
  9
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.25
• 拓扑面积：
  83.1
• 氢给体数：
  0
• 氢受体数：
  9

反应信息

• 作为反应物：
  描述：

  3,4-dimethoxyphenylboroxine 在 三苯基膦双(三氟甲磺酰亚胺)金 、 水 作用下， 反应 1.5h， 以100%的产率得到邻苯二甲醚
  参考文献：
  名称：

  Gold-Catalyzed Proto- and Deuterodeboronation

  摘要：

  A mild gold-catalyzed protodeboronation reaction, which does not require acid or base additives and can be carried out in "green" solvents, is described. As a result, the reaction is very functional-group-tolerant, even to acid- and base-sensitive functional groups, and should allow for the boronic acid group to be used as an effective traceless directing or blocking group. The reaction has also been extended to deuterodeboronations for regiospecific ipso-deuterations of aryls and heteroaryls from the corresponding organoboronic acid. Based on density functional theory calculations, a mechanism is proposed that involves nucleophilic attack of water at boron followed by rate-limiting B-C bond cleavage and facile protonolysis of a Au-sigma-phenyl intermediate.

  DOI：

  10.1021/acs.joc.5b01041
• 作为产物：
  描述：

  3,4-二甲氧基苯硼酸 以 甲苯 为溶剂， 生成 3,4-dimethoxyphenylboroxine
  参考文献：
  名称：

  铑催化的烯基硫盐与芳基环硼氧烷的发散芳基化反应

  摘要：

  报道了一种配体控制的铑催化的烯基噻蒽盐与芳基环硼氧烷的发散芳基化反应，该反应允许以高度选择性的方式可切换地合成末端和内部烯烃产物。二烯配体的使用引导反应向胺-芳基化反应提供末端烯烃，而膦配体的使用将反应切换为完全产生内部烯烃的异-芳基化。

  DOI：

  10.1002/anie.202212522

文献信息

• Oxidative Heck desymmetrisation of 2,2-disubstituted cyclopentene-1,3-diones
  作者：S. E. Walker、C. J. C. Lamb、N. A. Beattie、P. Nikodemiak、A.-L. Lee

  DOI：10.1039/c5cc00407a

  日期：——

  Oxidative Heck couplings have been successfully developed for 2,2-disubstituted cyclopentene-1,3-diones. The direct coupling onto the 2,2-disubstituted cyclopentene-1,3-dione core provides a novel, expedient and useful way of desymmetrising all-carbon quaternary centres.

  氧化Heck偶联反应已成功用于2,2-二取代环戊烯-1,3-二酮。直接偶联到2,2-二取代环戊烯-1,3-二酮核心提供了一种新颖、迅速和有用的方法，用于非对称化全碳季铵中心。
• Rhodium-Catalyzed Synthesis of Amides from Functionalized Blocked Isocyanates
  作者：Joshua S. Derasp、André M. Beauchemin

  DOI：10.1021/acscatal.9b02641

  日期：2019.9.6

  Isocyanates are useful building blocks for the synthesis of amides, although their widespread use has been limited by their high reactivity, which often results in poor functional group tolerance and a propensity to oligomerize. Herein, a rhodium-catalyzed synthesis of amides is described coupling boroxines with blocked (masked) isocyanates. The success of the reaction hinges on the ability to form

  异氰酸酯是酰胺合成的有用组成部分，尽管它们的广泛使用受到其高反应性的限制，这通常导致较差的官能团耐受性和低聚倾向。在本文中，描述了铑催化的酰胺的合成，其将环硼氧烷与封闭的（被掩蔽的）异氰酸酯偶联。反应的成功取决于原位形成异氰酸酯和有机铑中间体的能力。依赖于掩蔽的异氰酸酯前体和有机铑中间体的高反应性，可实现宽泛的官能团耐受性，包括质子亲核基团（如胺，苯胺和醇）。
• Cu-catalyzed C(sp²)–N-bond coupling of boronic acids and cyclic imides
  作者：Linn Neerbye Berntsen、Thomas Nordbø Solvi、Kristian Sørnes、David S. Wragg、Alexander H. Sandtorv

  DOI：10.1039/d1cc04356k

  日期：——

  Cu-t the Ru. A general Cu-catalyzed method for (E)-enimide-formation is described. The process is mild and practical, and couples cyclic imides and alkenylboronic acids. The method can also be used to prepare N-arylimides.

  切割Ru。描述了一种通用的Cu催化方法，用于(E)-enimide形成。该过程温和实用，将环状酰胺和烯基硼酸偶联。该方法也可用于制备N-芳基酰胺。
• Enantioselective Synthesis of 2-Aryl-4-piperidones via Rhodium/Phosphoramidite-Catalyzed Conjugate Addition of Arylboroxines
  作者：Richard B. C. Jagt、Johannes G. de Vries、Ben L. Feringa、Adriaan J. Minnaard

  DOI：10.1021/ol050734m

  日期：2005.6.1

  [GRAPHICS]The highly enantioselective synthesis of 2-aryl-4-piperidones by rhodium/phosphoramidite-catalyzed conjugate addition of arylboroxines to 2,3-dihydro-4-pyridones is described. Both enantiomers of a variety of products with sterically and electronically different R substituents were obtained in high isolated yield and with excellent enantioselectivity up to 99%.
• Gold-Catalyzed Proto- and Deuterodeboronation
  作者：Graeme Barker、Stacey Webster、David G. Johnson、Rachel Curley、Matthew Andrews、Paul C. Young、Stuart A. Macgregor、Ai-Lan Lee

  DOI：10.1021/acs.joc.5b01041

  日期：2015.10.16

  A mild gold-catalyzed protodeboronation reaction, which does not require acid or base additives and can be carried out in "green" solvents, is described. As a result, the reaction is very functional-group-tolerant, even to acid- and base-sensitive functional groups, and should allow for the boronic acid group to be used as an effective traceless directing or blocking group. The reaction has also been extended to deuterodeboronations for regiospecific ipso-deuterations of aryls and heteroaryls from the corresponding organoboronic acid. Based on density functional theory calculations, a mechanism is proposed that involves nucleophilic attack of water at boron followed by rate-limiting B-C bond cleavage and facile protonolysis of a Au-sigma-phenyl intermediate.