N-(2-硝基杂芳基)吲哚或-咔唑在875°C的快速真空热解得到了吡咯并[3,2,1- jk ]咔唑(50-55%)和吲哚并[3,2,1-的氮杂类似物。通过产生芳基和环化分别形成[ jk ]咔唑(55-85%)环系统。另一方面,N-(2-硝基杂芳基)吲唑和-苯并咪唑在850°C的相应反应通过自由基开环和氢原子重排的机理得到咔唑-1-腈衍生物(56-64%)。 气相反应-环化-杂环-热解-硝基化合物
N-(2-硝基杂芳基)吲哚或-咔唑在875°C的快速真空热解得到了吡咯并[3,2,1- jk ]咔唑(50-55%)和吲哚并[3,2,1-的氮杂类似物。通过产生芳基和环化分别形成[ jk ]咔唑(55-85%)环系统。另一方面,N-(2-硝基杂芳基)吲唑和-苯并咪唑在850°C的相应反应通过自由基开环和氢原子重排的机理得到咔唑-1-腈衍生物(56-64%)。 气相反应-环化-杂环-热解-硝基化合物
The direct ortho arylation of 4-methyl-N-phenylpyridin-2-amines via palladium(II)-catalyzed C-H activation is described. Treatment of 4-methyl-N-phenylpyridin-2-amine with potassium aryltrifluoroborate using 10 mol % of palladium(II) acetate as the catalyst, 2 equiv of copper(II) acetate as the oxidant, and 1 equiv of p-benzoquinone in tert-butyl alcohol gave ortho-arylated products in modest to excellent yields. This reaction shows good functional group compatibility. A series of H-1 NMR titration experiments and controlled experiments elucidating the reaction mechanism were carried out. The key intermediate, 4-methyl-N-phenylpyridin-2-amine palladacycle, was isolated and characterized by X-ray crystallography. The advanced transformations of ortho-phenylated 4-methyl-N-phenylpyridin-2-amine to N-(4-methylpyridin-2-yl)-9H-carbazole, biphenyl-2-amine, and 3-methyl-6-phenylpyrido[1,2-a]benzimidazole were successfully demonstrated as potential synthetic applications.