Cobalt-Catalyzed Cycloamination: Synthesis and Photophysical Properties of Polycyclic <i>N</i>-Heterocycles
作者:Yu Dong、Jian Yang、Hua Zhang、Xiao-Yu Zhan、Shuai He、Zhi-Chuan Shi、Xiao-Mei Zhang、Ji-Yu Wang
DOI:10.1021/acs.orglett.0c01753
日期:2020.7.2
The first earth-abundant cobalt-catalyzed cycloamination of indolylquinones and various (hetero)aromatic amine under ligand-free conditions for the synthesis of polycyclic N-heterocycles has been developed. The process allows facile access to polycyclic N-heterocycles with tolerance of chloride, bromide, amino, thio, etc. groups in moderate to high yields (up to 89%). In addition, The photophysical
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。
InBr<sub>3</sub>-Catalyzed Conjugate Addition of Indoles to <i>p</i>-Quinones: An Efficient Synthesis of 3-Indolylquinones
作者:J. Yadav、B. Reddy、T. Swamy
DOI:10.1055/s-2003-44364
日期:——
Indium(III) bromide catalyzes efficiently the conjugate addition of indoles to p-benzoquinones under mild conditions to afford the corresponding 3-indolylquinones in high yields with high selectivity. 1,4-Naphthoquinones also underwent Michael addition with indoles under similar conditions to give 3-indolylnaphthoquinones.
The usefulness of 3-iodoindoles available for introduction of an indole unit is presented. The reaction of various halo-3-iodoindoles with 1,4-naphthoquinone gave the corresponding 2-(3-indolyl)-1-4,naphthoquinones in moderate yields. The 3-iodoindole was used for synthesis of a compound containing both naph-thazarin and indole skeletons.