agirl,
I'd have to agree with Os on this. It just makes more sense to alkylate before rather than after.
Still, if you're absolutely intent on doing the alkylation later, then I'd suggest reacting the amine with phthalic anhydride, then deprotecting it with hydrazine.
So what is your synthetic route here then? It sounds like you have something particular in mind. Please, please, please tell me you're investigating a route using benzoquinone as the starting material - I always wondered why this procedure showed so much promise for 2C-T-1, but a modified version was never even looked at for higher analogs. It just seems like such a terrible oversight, especially since it looks like it could be a great improvent over other synthetic procedures.
Otherwise, have you looked at those Czech procedures using benzyl cyanides during the early 1990's? I always thought that looked decent as well...
If you need any more information, just ask...