4,8-dimethyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,3,6,2-dioxazaborocane

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 溴苄基硼酸频哪醇酯
• 英文名称: 4,8-dimethyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,3,6,2-dioxazaborocane
• 英文别名: pinacolato(diisopropanolaminato)diboron；4,8-Dimethyl-2-(tetramethyl-1,3,2-dioxaborolan-2-yl)-1,3,6,2-dioxazaborocane
• 化学式: C₁₂H₂₅B₂NO₄
• 分子量: 268.957
• InChiKey: IGLQSAGCEMHFPH-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.06
• 重原子数：
  19
• 可旋转键数：
  1
• 环数：
  2.0
• sp3杂化的碳原子比例：
  1.0
• 拓扑面积：
  49
• 氢给体数：
  1
• 氢受体数：
  5

反应信息

• 作为反应物：
  描述：

  4-甲基-3戊烯-2-酮 、 4,8-dimethyl-2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,3,6,2-dioxazaborocane 在 copper(l) chloride 、 2,2,2-三氟乙醇 作用下， 以 二氯甲烷 为溶剂， 反应 48.08h， 以55%的产率得到4-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pentan-2-one
  参考文献：
  名称：

  Structure and Reactivity of a Preactivated sp²–sp³ Diboron Reagent: Catalytic Regioselective Boration of α,β-Unsaturated Conjugated Compounds

  摘要：

  A novel sp(2)-sp(3) diboron reagent has been developed for the copper-catalyzed beta-boration of alpha,beta-unsaturated conjugated compounds. The reaction proceeds under mild conditions with various substrates, i.e., alpha,beta-unsaturated esters, ketones, nitriles, ynones, amides, and aldehydes, in the absence of additives such as phosphine and sodium tert-butoxide to provide beta-borylhomoenolates in good to excellent yields. The presence of an sp(3)-hybridized boron center, un-ambigously confirmed by X-ray crystallography, sufficiently activates the unsymmetrical pinacolato diisopropanolaminato diboron (PDIPA diboron, 2) to transfer the sp(2)-hybridized boron moiety chemoselectively. These observations suggest that the activation of one of the boron atoms is an essential step in the Cu-catalyzed beta-boration catalytic cycle.

  DOI：

  10.1021/jo2003488

文献信息

• Pd-catalyzed dearomative arylborylation of indoles
  作者：Chong Shen、Nicolas Zeidan、Quan Wu、Christian B. J. Breuers、Ren-Rong Liu、Yi-Xia Jia、Mark Lautens

  DOI：10.1039/c8sc05737k

  日期：——

  A palladium-catalyzed dearomative arylborylation of indoles is reported, which provides straightforward access to structurally diverse indolines bearing vicinal tetrasubstituted and borylated trisubstituted stereocenters in moderate to good yields with excellent diastereoselectivities.

  报道了一种钯催化的脱芳香基取代的吲哚芳基硼化反应，该反应提供了一种直接访问结构多样的吲哚烷衍生物的方法，这些衍生物带有邻位四取代和硼取代的三取代立体中心，收率中等至良好，对映选择性优异。
• Structure and Reactivity of a Preactivated sp²–sp³ Diboron Reagent: Catalytic Regioselective Boration of α,β-Unsaturated Conjugated Compounds
  作者：Ming Gao、Steven B. Thorpe、Christian Kleeberg、Carla Slebodnick、Todd B. Marder、Webster L. Santos

  DOI：10.1021/jo2003488

  日期：2011.5.20

  A novel sp(2)-sp(3) diboron reagent has been developed for the copper-catalyzed beta-boration of alpha,beta-unsaturated conjugated compounds. The reaction proceeds under mild conditions with various substrates, i.e., alpha,beta-unsaturated esters, ketones, nitriles, ynones, amides, and aldehydes, in the absence of additives such as phosphine and sodium tert-butoxide to provide beta-borylhomoenolates in good to excellent yields. The presence of an sp(3)-hybridized boron center, un-ambigously confirmed by X-ray crystallography, sufficiently activates the unsymmetrical pinacolato diisopropanolaminato diboron (PDIPA diboron, 2) to transfer the sp(2)-hybridized boron moiety chemoselectively. These observations suggest that the activation of one of the boron atoms is an essential step in the Cu-catalyzed beta-boration catalytic cycle.