It's a question that makes no sense! Good lord, I know higher education standards have dropped in many places in recent years, but a thesis out of a couple of articles...no, no, no!If that were the case, the next step would be to distribute PhDs with BIRTH CERTIFICATES!
You don't extract these from articles. Articles are read, digested and understood to contribute to and develop YOUR thesis. Which is? A thesis is not a relatively long piece of written work. It's a series of notions and ideas that you must expose to serious stress-testing.