An improved method for the synthesis of carbazolones via the
condensation of arylamines with 1,3-cyclodiketones followed by intramolecular
oxidative cyclization catalyzed by palladium acetate and copper
acetate in ethanol under an oxygen atmosphere was established. The
improved method has the advantage of easily available starting materials
and affords good yields.
carbazolones - intramolecular oxidative cyclization - oxygen - palladium acetate - copper acetate