A convenient phosphine-free palladium-catalyzed direct arylation of thiazole under mild aerobic conditions

• A series of bulky aniline palladium complexes were synthesized.
• The application of the direct arylation of thiazoles with aryl bromides was explored.
• The catalytic system showed high activity at a low palladium of 0.5–0.05 mol% under aerobic conditions.

A series of bulky amine palladium complexes {[(Ar-NH2)2PdCl2]} were synthesized and characterized. The catalytic activity of the palladium complexes was evaluated via the direct C–H arylation of thiazoles with aryl bromides in aerobic conditions at 80–100 °C. Under the optimal conditions, 0.5–0.05 mol% of the bulky palladium complexes were found to be very efficient and produced the desired cross-coupling products in high yields.

A series of bulky aniline palladium complexes were synthesized and characterized, which exhibited significantly activities for direct arylation of thiazoles with aryl bromides.Figure optionsDownload as PowerPoint slide