5-tert-butyl-3-(2-diphenylphosphinoethyl)pyrazole | 493038-68-9

• 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: 5-tert-butyl-3-(2-diphenylphosphinoethyl)pyrazole
• 英文别名: 2-(3-tert-butyl-1H-pyrazol-5-yl)ethyl-diphenylphosphane
• CAS: 493038-68-9
• 化学式: C₂₁H₂₅N₂P
• 分子量: 336.417
• InChiKey: KOWPYYCPIFWANE-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  5
• 重原子数：
  24
• 可旋转键数：
  6
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.29
• 拓扑面积：
  28.7
• 氢给体数：
  1
• 氢受体数：
  1

反应信息

• 作为反应物：
  描述：

  双(乙腈)氯化钯(II) 、 5-tert-butyl-3-(2-diphenylphosphinoethyl)pyrazole 以 甲醇 为溶剂， 以81%的产率得到2-(3-tert-butyl-1H-pyrazol-5-yl)ethyl-diphenylphosphane;dichloropalladium
  参考文献：
  名称：

  Substituent Control of Hydrogen Bonding in Palladium(II)−Pyrazole Complexes

  摘要：

  Inter- and intramolecular hydrogen bonding of an N-H group in pyrazole complexes was studied using ligands with two different groups at pyrazole C-3 and C-5. At C-5, groups such as methyl, i-propyl, phenyl, or tert-butyl were present. At C-3, side chains L-CH2- and L-CH2CH2- (L = thioether or phosphine) ensured formation of chelates to a cis-dichloropalladium(II) fragment through side-chain atom L and the pyrazole nitrogen closest to the side chain. The significance of the ligands is that by placing a ligating side chain on a ring carbon (C-3), rather than on a ring nitrogen, the ring nitrogen not bound to the metal and its attached proton are available for hydrogen bonding. As desired, seven chelate complexes examined by X-ray diffraction all showed intramolecular hydrogen bonding between the pyrazole N-H and a chloride ligand in the cis position. In addition, however, intermolecular hydrogen bonding could be controlled by the substituent at C-5: complexes with either a methyl at C-5 or no substituent there showed significant intermolecular hydrogen bonding interactions, which were completely avoided by placing a tert-butyl group at C-5. The acidity of two complexes in acetonitrile solutions was estimated to be closer to that of pyridinium ion than those of imidazolium or triethylammonium ions.

  DOI：

  10.1021/ic026104n
• 作为产物：
  描述：

  7-[(tetrahydro-2H-pyran-2-yl)oxy]-2,2-dimethylhept-4-yn-3-one 在 盐酸 、 氯化亚砜 、 一水合肼 作用下， 以 四氢呋喃 、 甲醇 、 二氯甲烷 为溶剂， 反应 88.0h， 生成 5-tert-butyl-3-(2-diphenylphosphinoethyl)pyrazole
  参考文献：
  名称：

  在C3和C5处具有不同官能化取代基的吡唑的新的灵活合成方法。

  摘要：

  呈现了具有连接至碳3的官能化侧链和连接至碳5的变化的烷基和芳基取代基的吡唑的合成。此处报道了在C5处安装R =甲基，异丙基，叔丁基，金刚烷基或苯基，方法是首先将受保护的炔醇与酰氯RCOCl偶联，形成炔基酮，然后与肼反应形成吡唑核。醇脱保护并转化为氯化物，得到5-取代的3-（氯甲基）-或3-（2-氯乙基）吡唑。此序列可以在2 d内以30 g的规模完成，并具有出色的总产量。通过亲核取代反应，氯化物是其他多官能吡唑的有用前体。在本文的工作中，制备了在C3上具有侧链LCH（2）-和LCH（2）CH（2）-的衍生物（L =硫醚或膦）作为配体。

  DOI：

  10.1021/jo026083e

文献信息

• New Flexible Synthesis of Pyrazoles with Different, Functionalized Substituents at C3 and C5
  作者：Douglas B. Grotjahn、Sang Van、David Combs、Daniel A. Lev、Christian Schneider、Marc Rideout、Christoph Meyer、Genaro Hernandez、Lupe Mejorado

  DOI：10.1021/jo026083e

  日期：2002.12.1

  presented. Installation of R = methyl, isopropyl, tert-butyl, adamantyl, or phenyl groups at C5 is reported here, starting by coupling protected alkynols with acid chlorides RCOCl, forming alkynyl ketones, which are reacted with hydrazine to form the pyrazole nucleus. Alcohol deprotection and conversion to a chloride gave 5-substituted 3-(chloromethyl)- or 3-(2-chloroethyl)pyrazoles. This sequence can be

  呈现了具有连接至碳3的官能化侧链和连接至碳5的变化的烷基和芳基取代基的吡唑的合成。此处报道了在C5处安装R =甲基，异丙基，叔丁基，金刚烷基或苯基，方法是首先将受保护的炔醇与酰氯RCOCl偶联，形成炔基酮，然后与肼反应形成吡唑核。醇脱保护并转化为氯化物，得到5-取代的3-（氯甲基）-或3-（2-氯乙基）吡唑。此序列可以在2 d内以30 g的规模完成，并具有出色的总产量。通过亲核取代反应，氯化物是其他多官能吡唑的有用前体。在本文的工作中，制备了在C3上具有侧链LCH（2）-和LCH（2）CH（2）-的衍生物（L =硫醚或膦）作为配体。
• Substituent Control of Hydrogen Bonding in Palladium(II)−Pyrazole Complexes
  作者：Douglas B. Grotjahn、Sang Van、David Combs、Daniel A. Lev、Christian Schneider、Christopher D. Incarvito、Kim-Chung Lam、Gene Rossi、Arnold L. Rheingold、Marc Rideout、Christoph Meyer、Genaro Hernandez、Lupe Mejorado

  DOI：10.1021/ic026104n

  日期：2003.5.1

  Inter- and intramolecular hydrogen bonding of an N-H group in pyrazole complexes was studied using ligands with two different groups at pyrazole C-3 and C-5. At C-5, groups such as methyl, i-propyl, phenyl, or tert-butyl were present. At C-3, side chains L-CH2- and L-CH2CH2- (L = thioether or phosphine) ensured formation of chelates to a cis-dichloropalladium(II) fragment through side-chain atom L and the pyrazole nitrogen closest to the side chain. The significance of the ligands is that by placing a ligating side chain on a ring carbon (C-3), rather than on a ring nitrogen, the ring nitrogen not bound to the metal and its attached proton are available for hydrogen bonding. As desired, seven chelate complexes examined by X-ray diffraction all showed intramolecular hydrogen bonding between the pyrazole N-H and a chloride ligand in the cis position. In addition, however, intermolecular hydrogen bonding could be controlled by the substituent at C-5: complexes with either a methyl at C-5 or no substituent there showed significant intermolecular hydrogen bonding interactions, which were completely avoided by placing a tert-butyl group at C-5. The acidity of two complexes in acetonitrile solutions was estimated to be closer to that of pyridinium ion than those of imidazolium or triethylammonium ions.