The nitrogen would DEFINITELY need protection. Besides, indanes cannot be made in good yields by the friedel-crafts alkylation of benzene rings, you would end up with a 1,3-diphenylpropane derivative. Indanes are usually made by the intramolecular friedel-crafts acylation of a phenylpropionyl chloride, followed by reduction of the carbonyl group, or by the hydrogenation of the corresponding indene.