6-methoxy-7-methyl-1-phenyl-9H-carbazole | 1416353-76-8

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 吲哚及其衍生物
• 英文名称: 6-methoxy-7-methyl-1-phenyl-9H-carbazole
• CAS: 1416353-76-8
• 化学式: C₂₀H₁₇NO
• 分子量: 287.361
• InChiKey: XMHWZKXWMCCUAO-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  5.3
• 重原子数：
  22
• 可旋转键数：
  2
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.1
• 拓扑面积：
  25
• 氢给体数：
  1
• 氢受体数：
  1

反应信息

• 作为产物：
  描述：

  4-甲氧基-3-甲基苯胺 在 tris-(dibenzylideneacetone)dipalladium(0) 、 sodium persulfate 、 potassium tert-butylate 、 palladium diacetate 、 silver nitrate 、 双(2-二苯基磷苯基)醚 、 对苯醌 、 三氟甲烷磺酸甲酯 作用下， 以 1,4-二氧六环 、 二氯甲烷 、 水 、 乙酸乙酯 、 甲苯 、 叔丁醇 为溶剂， 反应 74.0h， 生成 6-methoxy-7-methyl-1-phenyl-9H-carbazole
  参考文献：
  名称：

  Direct Ortho Arylation of 9-(Pyridin-2-yl)-9H-carbazoles Bearing a Removable Directing Group via Palladium(II)-Catalyzed C–H Bond Activation

  摘要：

  A one-pot synthesis of ortho-arylated 9-(pyridin-2-yl)-9H-carbazoles via C-H bond activation is presented. Silver nitrate and tert-butyl alcohol were found to be the best oxidant and solvent for the process, respectively. The product yields are from modest to excellent, and the reaction showed sufficient functional group tolerance. p-Benzoquinone served as an important ligand for the transmetalation and reductive elimination steps in the catalytic process. The key intermediate of the reaction, a 9-(pyridin-2-yl)-9H-carbazole palladacycle, was isolated, and its structure was unequivocally confirmed by X-ray crystallography. No kinetic isotope effect (k(H)/k(D) = 1.00 +/- 0.17) for the C-H bond activation step was observed. In addition, a Hammett experiment gave a negative rho value, -2.16 +/- 0.02. The directing group, pyridinyl, was demonstrated to be a removable functional group. Finally, a rational catalytic mechanism is presented on the basis of all experimental evidence.

  DOI：

  10.1021/om301071m

文献信息

• Temporary (PO) directing group enabled carbazole <i>ortho</i> arylation <i>via</i> palladium catalysis
  作者：Zhi-Chao Qi、Qin-Xin Lou、Yuan Niu、Shang-Dong Yang

  DOI：10.1039/d0cc07596e

  日期：——

  A palladium-catalyzed, temporary P(O) directing group assisted C–H bond arylation of carbazoles was achieved. The release of the directing group occurs spontaneously in the reaction and the mechanistic studies indicate that acid is essential for N–P bond cleavage.

  实现了钯催化的临时P（O）导向基团协助咔唑的C–H键芳基化。引导基团的释放是在反应中自发发生的，并且机理研究表明，酸对于N-P键的裂解至关重要。