Specially in Ullman reactions, conditions are- Use of Copper /KOH at elevated temp-200 C and CuO/K2CO3 at 180 C may be possible....

Instead of aromatic  amine you can start with  aromatic Nitro  compound, after coupling you can go for reduction of Nitro to get your desired product.

The electronics for the coupling are not favourable for 4-bromoaniline, with the major drawback of potential polymerisation.

Use the nitro compound as suggested by Gohain, the electron withdrawing nature of the nitro group will help facilitate the desired reaction. The iodide usually works better or alternatively you could use the fluoride and attempt a nucleophilic aromatic substitution.

I would probably be inclined to use the buchwald conditions, which tend to be milder.

Electron withdrawing group can help in the Ullmann reaction. Also, try using NMP as a solvent, which give you a higher reaction temperature.

A best eample of synthesis of Acridones via N-Phenyl anthranilic acid using Ullmann Reaction, conditions- Copper /KOH at elevated temp-200 C

Thanks to all for your valuable suggestions..

The Buchwald condition will be milder than Ullmann. It also tolerates more functional group than the Ullmann reaction protocol

There is little known about the arylation of phenoxazine, here is the reference:

http://pubs.acs.org/doi/abs/10.1021/ja01570a048

I would use 4-nitrobromobenzene, according to the method given there for 10-phenylphenoxazine, then reduce with SnCl2/HCl/EtOH. If it does not work, try to make p-bromo-analog, described in the article, and make amination with Ph2C=NH using Buchwald conditions.

Thanks for the suggestions.

I tried buchwald coupling using Trioctylphosphine, Triphenylphosphine ligands with Palladium acetate in toluene. But many of paper say to use of Tributylphonsphine.  Is that coupling possible only with this catalyst???

Try reaction in DMF, catalyst CuI, ligand proline or better its sodium salt, temperature cca 80 °C.