The palladium-catalyzed direct2- or 5-arylation of some free NH2-substituted thiophenederivatives was found to proceed in high yields using a variety of aryl bromides. In the course of these reactions, no coupling of the aryl bromide with the thiophene NH2 substituent was detected. The presence of an ester substituent on C2 of thiophene was found to be useful to block this highly reactive carbon
Palladium-catalyzed direct arylation using free NH2 substituted thiophene derivatives with inhibition of amination type reaction
作者:Fazia Derridj、Karima Si Larbi、Julien Roger、Safia Djebbar、Henri Doucet
DOI:10.1016/j.tet.2012.06.053
日期:2012.9
The palladium-catalyzeddirectarylation at C2 or C5 of free NH2 substituted thiophene derivatives was found to proceed in moderate to high yields using a variety of aryl halides. The choice of potassium acetate as the base was found to be crucial to inhibit the amination reaction and to promote the directarylation.