2-(naphthalen-2-yl)pyrazolo[1,5-a]pyridine | 1337984-81-2

• 分子结构分类: 有机化合物 - 苯类化合物 - 萘
• 英文名称: 2-(naphthalen-2-yl)pyrazolo[1,5-a]pyridine
• CAS: 1337984-81-2
• 化学式: C₁₇H₁₂N₂
• 分子量: 244.296
• InChiKey: VQGIAFILEVHGOI-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  4.15
• 重原子数：
  19.0
• 可旋转键数：
  1.0
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.0
• 拓扑面积：
  17.3
• 氢给体数：
  0.0
• 氢受体数：
  2.0

反应信息

• 作为产物：
  描述：

  吡啶 在 palladium bromide 、 三(4-甲氧苯基)膦 、 silver benzoate 、 2,4-二硝基苯基羟胺 、 sodium hydroxide 作用下， 以 四氢呋喃 、 1,4-二氧六环 、 水 、 乙腈 为溶剂， 反应 45.08h， 生成 2-(naphthalen-2-yl)pyrazolo[1,5-a]pyridine
  参考文献：
  名称：

  Synthesis of 2- and 2,3-Substituted Pyrazolo[1,5-a]pyridines: Scope and Mechanistic Considerations of a Domino Direct Alkynylation and Cyclization of N-Iminopyridinium Ylides Using Alkenyl Bromides, Alkenyl Iodides, and Alkynes

  摘要：

  Direct functionalization and tandem processes have both received considerable recent interest due to their cost and time efficiency. Herein we report the synthesis of difficult to obtain 2-substituted pyrazolo[1,5-a]pyridines through a tandem palladium-catalyzed/silver-mediated elimination/direct functionalization/cyclization reaction involving N-benzoyliminopyridinium ylides. As such, these biologically important molecules are prepared in an efficient, high-yielding manner, only requiring a two-step sequence from pyridine. Aryl-substituted alkenyl bromides and iodides are effective ylide coupling partners. Mechanistic studies led to the use of terminal alkynes, which extended the scope of the reaction to include alkyl substitution on the unsaturated reactive site. The optimization, scope, and mechanistic considerations of the process are discussed.

  DOI：

  10.1021/jo201303x

文献信息

• Base-mediated [3 + 2]-cycloannulation strategy for the synthesis of pyrazolo[1,5-<i>a</i>]pyridine derivatives using (<i>E</i>)-β-iodovinyl sulfones
  作者：Raju Jannapu Reddy、Nunavath Sharadha、Arram Haritha Kumari

  DOI：10.1039/d2ob00499b

  日期：——

  with 1-aminopyridinium iodide is realized to access 2-substituted pyrazolo[1,5-a]pyridines in good to high yields. An essential modification of the dipolar N-tosylpyridinium imide allows the first preparative synthesis of 3-sulfonyl-pyrazolo[1,5-a]pyridines in moderate to high yields. Of note, the metal-free protocol features a broad substrate scope with good functional group tolerance and compatibility

  吡唑并[1,5- a ]吡啶继续在药物化学中占据特殊地位，但3-磺酰基类似物的直接构建仍未探索。在碱性条件下，吡啶鎓-N-胺和相应的偶极胺在使用( E )-β-碘乙烯基砜的[3 + 2]-环加成反应中发挥了重要作用。K 2 CO 3介导的 ( E )-β-碘乙烯基砜与 1-氨基吡啶碘化物的串联环环脱磺酰基化反应以良好至高产率获得 2-取代的吡唑并[1,5- a ]吡啶。偶极N的基本修改-tosylpyridinium imide 首次以中等至高产率制备合成 3-磺酰基-吡唑并[1,5- a ] 吡啶。值得注意的是，无金属协议具有广泛的底物范围，具有良好的官能团耐受性和兼容性。通过克级反应证明了该过程的有效性，并根据具体结果提出了合理的机制。