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。
“On Water”-Promoted Direct Coupling of Indoles with 1,4-Benzoquinones without Catalyst
作者:Hai-Bo Zhang、Li Liu、Yong-Jun Chen、Dong Wang、Chao-Jun Li
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.
Synthesis and Pharmacological Studies of Some (1,4)-Naphthoquinono[3,2-c]-1H-pyrazoles,2-Substituted Amino-1,4-naphthoquinones, and Related Compounds
作者:V. K. Tandon、Meenu Vaish、J. M. Khanna、Nitya Anand
DOI:10.1002/ardp.19903230702
日期:——
Series of (1,4)‐Naphthoquinono(3,2‐c)‐1H‐pyrazoles and 2‐substituted amino‐1,4‐naphthoquinones have been synthesised and studied for their possible anticancer activity (animal tumours, Walker 256 carcinosarcoma), Influenza RNA transcriptase activity, antibiotic activity (C. neoformans, T. mentagraphytes, M. canis, A. niger, and C. albicans).