Generally, we don't answer this sort of question. Our forum rules specify that we won't help you hurt yourself, and making and ingesting home-made medicine is very much within that case. However, the answer is right here for you on Wikipedia:
https://en.wikipedia.org/wiki/Naproxen#SynthesisYou won't have the raw materials. You won't have the equipment
or skill. You won't be sure your product isn't flawed, because you don't have quality control -- either the policy or the analytical ability. So the entire process is moot. You will have the same success scaling up a paper airplane to a passenger size, or learning to drive by
treading the automobile model's manual.
{EDIT} I Spell better off my phone.