The reaction of 2-alkynyl anilines with catalytic amounts of B(C6F5)3 (5 mol%) resulted in the formation of 2-substituted indoles according to an intramolecular hydroamination in good to excellent yields. Reaction intermediates as well as products were characterized by NMR spectroscopy and by X-ray crystallography. The domino hydroamination/hydrogenation sequence allowed the efficient synthesis of
2-炔基苯胺与催化量的B(C 6 F 5)3(5mol%)的反应根据分子内加氢胺化以良好或优异的产率形成了2-取代的吲哚。反应中间体和产物通过NMR光谱和X射线晶体学表征。多米诺加氢胺化/加氢序列允许以高收率有效地合成四氢喹啉8。
Room-Temperature Palladium(II)-Catalyzed Direct 2-Arylation of Indoles with Tetraarylstannanes
作者:Yuxia Liu、Dong Xue、Chao Wang、Linjuan Huang
DOI:10.1055/s-0040-1707196
日期:2020.10
A palladium(II)-catalyzed direct 2-arylation of indoles by tetraarylstannanes with oxygen (balloon) as the oxidant at room temperature has been developed. Various tetraarylstannanes can be employed as aryl sources for 2-arylation of indoles in up to 89% yield, providing a practical and efficient catalytic protocol for accessing 2-arylindoles.
已开发出钯 (II) 催化的四芳基锡烷与氧(气球)作为氧化剂在室温下直接对吲哚进行 2-芳基化反应。各种四芳基锡烷可用作吲哚 2-芳基化的芳基来源,产率高达 89%,为获得 2-芳基吲哚提供了实用且有效的催化方案。
One-Pot Synthesis of 1,2-Disubstituted Indoles from 2-Ethynylanilines and Benzaldehydes
efficient synthesis of a variety of 1,2-disubstituted indoles from 2-ethynylanilines was developed. Using 2-ethynylanilines and benzaldehydes as starting materials, the target products (1,2-disubstituted indoles) were obtained smoothly through condensation, reduction, and subsequent cyclization. Various functional groups attached to the aryl ring of 1,2-disubstituted indoles were well tolerated. The protocol
Indoles Synthesized from Amines via Copper Catalysis
作者:Ronald Besandre、Miguel Jaimes、Jeremy A. May
DOI:10.1021/ol400444g
日期:2013.4.5
N-Substituted indoles are synthesized from primary amines through a tandem reaction sequence. Initial condensation of the amine with an alpha-(o-haloaryl)ketone or aldehyde is followed by intramolecular aryl amination catalyzed by CuI. A variety of anilines and alkyl amines, including those with significant steric demands, are converted to indoles in high yields and with varying indole substitution.