The copper-catalyzed cycloamination of indolylquinones and various (hetero)aromaticamines under ligand-free conditions for the synthesis of polycyclic N-heterocycles has been developed. This method allows facile access to polycyclic N-heterocycles with the tolerance of chloride, bromide, amino, thio, etc. groups in moderate to high yields (60–89%).
An atom-economical and environmentally benign approach for the synthesis of 3-indolylquinones was achieved successfully via direct oxidative C–C coupling of quinones/hydroquinones with indoles using (NH4)2S2O8 in dichloroethane at 80 °C. The efficiency of this catalytic approach was established by a broad scope of substrates involving quinones and hydroquinones to give high yields (61–93%) of 3-indolylquinones
通过在 80°C 下在二氯乙烷中使用 (NH 4 ) 2 S 2 O 8将醌/氢醌与吲哚直接氧化 C-C 偶联,成功实现了一种原子经济且环境友好的合成 3-吲哚基醌的方法。这种催化方法的效率取决于包括醌和氢醌在内的广泛底物,以提供高产率 (61-93%) 的 3-吲哚基醌。本协议简单、实用,并显示出良好的官能团耐受性。此外,对所得3-吲哚基萘醌类化合物进行进一步转化,分别合成了2-氨基-3-吲哚基萘醌类化合物和多环N-杂环化合物。
Tandem oxidation–oxidative C–H/C–H cross-coupling: synthesis of arylquinones from hydroquinones
作者:Shuai Zhang、Feijie Song、Dongbing Zhao、Jingsong You
DOI:10.1039/c3cc41067f
日期:——
A concise and efficient approach to arylquinones from widely available hydroquinones has been developed through a tandem reaction involving the oxidation of hydroquinones and subsequent oxidative CâH/CâH cross-coupling of the resulting quinones with arenes.