Highly selective synthesis of 4(5)-aryl-, 2,4(5)-diaryl-, and 4,5-diaryl-1H-imidazoles via Pd-catalyzed direct C-5 arylation of 1-benzyl-1H-imidazole
作者:Fabio Bellina、Silvia Cauteruccio、Annarita Di Fiore、Chiara Marchetti、Renzo Rossi
DOI:10.1016/j.tet.2008.01.051
日期:2008.6
direct C-2 arylation of imidazoles 9 with aryl halides underbase-free and ligandlessconditions. On the other hand, the four-step synthesis of imidazoles 1 from 8 also involves the regioselective bromination of compounds 9 and a Suzuki reaction of the resulting 5-aryl-1-benzyl-4-bromo-1H-imidazoles 11 with arylboronic acids 5 under phase-transfer conditions, followed by N-debenzylation.