Fluoradenes via palladium-catalyzed intramolecular arylation

Chem Commun (Camb). 2011 Feb 21;47(7):2155-7. doi: 10.1039/c0cc05004k. Epub 2011 Jan 6.

Abstract

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.