Fluoradenes via palladium-catalyzed intramolecular arylation. 2011

Lingling Rong, and Qiancai Liu, and Yingbo Shi, and Jie Tang
Department of Chemistry, East China Normal University, 3663 Zhongshan Rd(N), Shanghai 200062, China.

A novel approach towards 7b-aryl-indeno[1,2,3-jk]fluorene based on a nitrogen-containing core is reported. The acid-promoted Friedel-Crafts reaction of 9-(2-bromophenyl)-9-fluorenol with carbazole, triphenylamine or triindole afforded 9-(2-bromophenyl)fluorenyl-carbazole, -triphenylamine and -triindole derivatives, which were subsequently converted to 7b-aryl-fluoradenes via palladium-catalyzed intramolecular C-H direct arylation as a key step.

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