3-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pentan-2-one | 1302132-92-8

• 分子结构分类: 有机化合物 - 有机酸及其衍生物 - 硼酸衍生物
• 英文名称: 3-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pentan-2-one
• CAS: 1302132-92-8
• 化学式: C₁₂H₂₃BO₃
• 分子量: 226.124
• InChiKey: XSHXPXGRJRZJCY-UHFFFAOYSA-N

物化性质

• 沸点：
  265.1±23.0 °C(predicted)
• 密度：
  0.93±0.1 g/cm3(Temp: 20 °C; Press: 760 Torr)(predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  2.69
• 重原子数：
  16
• 可旋转键数：
  3
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.92
• 拓扑面积：
  35.5
• 氢给体数：
  0
• 氢受体数：
  3

反应信息

• 作为产物：
  描述：

  3-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， 生成 3-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