Nickel Catalysis Enables Hetero [2+2+1] Cycloaddition between Yne-Isothiocyanates and Isonitriles with Low Catalyst Loading
作者:Rui-Juan Liu、Peng-Fei Wang、Wen-Kui Yuan、Li-Rong Wen、Ming Li
DOI:10.1002/adsc.201601271
日期:2017.4.17
Nickel(II) can be used to catalyze the hetero [2+2+1] cycloaddition of 2‐alkynylaryl isothiocyanates and isonitriles in 2‐methyltetrahydrofuran (2‐MeTHF) to give a wide array of thieno[2,3‐b]indoles in excellent yields. The reaction is featured by employing as little as 0.3 mol% nickel(II) acetylacetonate [Ni(acac)2] under air conditions in the absence of any additives (additional reducing agents and
Cu(<scp>i</scp>) catalysis for selective condensation/bicycloaromatization of two different arylalkynes: direct and general construction of functionalized C–N axial biaryl compounds
enantioselectivity verifies its potential for the simplest asymmetric synthesis of atropoisomeric biaryls. Western blotting demonstrated that the newly developed compounds are promising targets in biology and pharmaceuticals. This unique reaction can construct structurally diverse C–N axial biarylcompounds that have never been reported by other methods, and might be extended to various applications in materials
Accessing N-heteroarylated indoles and benzimidazoles from 2-alkynyl cyclohexadienimines and cyclohexadienones through metal-catalyzed tandem reactions
作者:Min Yang、Jie Tang、Renhua Fan
DOI:10.1039/c2cc36113b
日期:——
N-Indolyl or N-benzofuranyl indoles and benzimidazoles were prepared through metal-catalyzed tandem reactions between 2-alkynyl cyclohexadienimines or cyclohexadienones and 2-alkynylanilines or N1-benzylbenzene-1,2-diamine.
Synthesis of carbonylated heteroaromatic compounds via visible-light-driven intramolecular decarboxylative cyclization of o-alkynylated carboxylic acids
An efficient strategy for the easy access to carbonylated heteroaromatic compounds has been developed via a visible-light-promoted intramolecular decarboxylative cyclization reaction of o-alkynylated carboxylic acids. This method is characterized by its benign conditions and the tolerance to a wide range of functionalities.
A Brønstedacid‐catalyzed annulation strategy has been developed to construct indeno[1,2‐c]quinolines. This tandem synthetic method proceeds through a sequential electrophilic addition followed by a Friedel–Crafts‐type reaction. A variety of tetracyclic compounds was obtained in moderate to high yields under mild reaction conditions in a short time.
已经开发出一种布伦斯台德酸催化环化策略来构建茚并[1,2- c ]喹啉。这种串联合成方法是通过依次进行亲电加成,然后进行Friedel-Crafts型反应来进行的。在短时间内在温和的反应条件下以中等至高收率获得了各种四环化合物。