2,4-二氟-5-碘吡啶 | 837364-89-3

• 物质功能分类: 医药中间体 - 杂环化合物 - 吡啶类化合物
• 分子结构分类: 有机化合物 - 有机杂环化合物 - 吡啶及其衍生物
• 中文名称: 2,4-二氟-5-碘吡啶
• 英文名称: 2,4-difluoro-5-iodopyridine
• CAS: 837364-89-3
• 化学式: C₅H₂F₂IN
• 分子量: 240.979
• InChiKey: GTAAUJUZQSTFHD-UHFFFAOYSA-N

物化性质

• 熔点：
  20-22 °C
• 沸点：
  76-77 °C(Press: 15 Torr)
• 密度：
  2.129±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  2
• 重原子数：
  9
• 可旋转键数：
  0
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.0
• 拓扑面积：
  12.9
• 氢给体数：
  0
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  2,4-二氟-5-碘吡啶 在 异丙基氯化镁 、 肼 作用下， 生成 4-氟-2-肼基-5-(三甲基硅烷基)吡啶
  参考文献：
  名称：

  Rerouting Nucleophilic Substitution from the 4-Position to the 2- or 6-Position of 2,4-Dihalopyridines and 2,4,6-Trihalopyridines: The Solution to a Long-Standing Problem

  摘要：

  2,4-Difluoro-, 2,4,6-trifluoro-, and 2,3,4,6-tetrafluoropyridine undergo nucleophilic substitution preferentially if not exclusively at the 4-position. However, after the introduction of a trialkylsilyl group at C-3 or C-5, the halogen at the 6-(2-)position is displaced selectively. This synthetically valuable regiocontrol can also be realized with other halopyridines such as 2,4-dichloro- and 2,4,6-trichloropyridine.

  DOI：

  10.1021/ol047826g
• 作为产物：
  描述：

  2,4,6-三氟吡啶 在 正丁基锂 、 四丁基氟化铵 、 一水合肼 、 copper(II) sulfate 、 lithium diisopropyl amide 作用下， 以 四氢呋喃 、 正己烷 、 水 为溶剂， 反应 5.92h， 生成 2,4-二氟-5-碘吡啶
  参考文献：
  名称：

  Rerouting Nucleophilic Substitution from the 4-Position to the 2- or 6-Position of 2,4-Dihalopyridines and 2,4,6-Trihalopyridines: The Solution to a Long-Standing Problem

  摘要：

  2,4-Difluoro-, 2,4,6-trifluoro-, and 2,3,4,6-tetrafluoropyridine undergo nucleophilic substitution preferentially if not exclusively at the 4-position. However, after the introduction of a trialkylsilyl group at C-3 or C-5, the halogen at the 6-(2-)position is displaced selectively. This synthetically valuable regiocontrol can also be realized with other halopyridines such as 2,4-dichloro- and 2,4,6-trichloropyridine.

  DOI：

  10.1021/ol047826g

文献信息

• Rerouting Nucleophilic Substitution from the 4-Position to the 2- or 6-Position of 2,4-Dihalopyridines and 2,4,6-Trihalopyridines: The Solution to a Long-Standing Problem
  作者：Manfred Schlosser、Thierry Rausis、Carla Bobbio

  DOI：10.1021/ol047826g

  日期：2005.1.1

  2,4-Difluoro-, 2,4,6-trifluoro-, and 2,3,4,6-tetrafluoropyridine undergo nucleophilic substitution preferentially if not exclusively at the 4-position. However, after the introduction of a trialkylsilyl group at C-3 or C-5, the halogen at the 6-(2-)position is displaced selectively. This synthetically valuable regiocontrol can also be realized with other halopyridines such as 2,4-dichloro- and 2,4,6-trichloropyridine.
• Regiochemically Flexible Substitutions of Di-, Tri-, and Tetrahalopyridines:  The Trialkylsilyl Trick
  作者：Manfred Schlosser、Carla Bobbio、Thierry Rausis

  DOI：10.1021/jo047962z

  日期：2005.4.1

  2,4-Difluoropyridine, 2,4-dichloropyridine, 2,4,6-trifluoropyridine, 2,4,6-trichloropyridine and 2,3,4,6-tetrafluoropyridine react with standard nucleophiles exclusively at the 4-position under halogen displacement. However, the regioselectivity can be completely reversed if a trialkylsilyl group is introduced in the 5-position of the 2,4-dihalopyridines or in the 3-position of the 2,4,6-trihalopyridines or 2,3,4,6-tetrahalopyridine. Then only the halogen most remote from the bulky silyl unit (at the 2-position in the case of the 2,4-halopyridines, at the 6-position with the other substrates) gets involved in the exchange process. After removal of the silyl protective group the nucleophile is invariably found to occupy the nitrogen-neighboring position.