Phosphine-free palladium-catalysed direct C2-arylation of benzothiophenes with aryl bromides
作者:Liqin Zhao、Christian Bruneau、Henri Doucet
DOI:10.1016/j.tet.2013.06.037
日期:2013.8
some electron-rich aryl bromides. The presence of a methyl or a formyl substituent at C3 of benzothiophene has a minor influence on the reactivity, and even a bromo substituents at C3 is tolerated. A wide variety of functional groups on the aryl bromide, such as nitrile, nitro, acetyl, formyl, ester, chloro, fluoro or trifluoromethyl has been employed.
A rhodium(iii)-catalyzed oxidative C–H/C–H cross-coupling of benzimidates with various heteroarenes has been devloped to directly furnish biheteroaryl-2-carbonitriles.