开放获取:通常无法直接将噻吩的反应性降低的噻吩的β位置进行直接功能化。但是,在噻吩与碘代芳烃的芳基化反应中,催化体系PdCl 2 / P {OCH(CF 3)2 } 3 / Ag 2 CO 3所观察到的β选择性是一种显着的普遍现象,适用于未取代的,单取代的,和二取代的噻吩衍生物,以及含噻吩的稠合芳族化合物。
Pd-Catalysed Direct Arylation of Heteroaromatics Using (Poly)halobenzenesulfonyl Chlorides as Coupling Partners: One Step Access to (Poly)halo-Substituted Bi(hetero)aryls
作者:Aymen Skhiri、Anissa Beladhria、Kedong Yuan、Jean-Francois Soulé、Ridha Ben Salem、Henri Doucet
DOI:10.1002/ejoc.201500354
日期:2015.7
The reactivity of (poly)halo-substituted benzenesulfonylchlorides for Pd-catalysed desulfitativearylation was investigated. 2-, 3- and 4-bromobenzenesulfonyl chlorides react nicely to afford arylated heteroarenes in moderate to high yields without cleavage of the C–Br bonds, allowing further transformations. A minor influence upon reaction yeilds was found to be exerted by the bromo substituent on