I want to prepare 4-aminoacetophenone, any body can give the way or idea to synthesis this compound
There is certainly a very good industrial synthesis of this. At
www.uspto.gov you can download patents for free, just do a text search.
However, I guess in the lab one could acetylate a nitrogen-protected aniline with acetic anhydride under Friedel-Crafts conditions. The main issue could be to make this reaction para-selective. You would then deprotect the nitrogen.
Sorry, I'm sure there are much better routes, but I can't think of any right now.