UPDATE 2-Chile Codelco sues Anglo to safeguard option

* Anglo American stake sale undermines Codelco option * Codelco has said a legal battle could last up to 4 years By Erik Lopez SANTIAGO, Nov 14 (Reuters) - Chilean copper giant Codelcosaid on Monday it had filed a lawsuit in a Chilean appeals court against Anglo American in a bid to prevent the global miner from selling further stakes in southern properties Codelco was looking to buy into. London-listed Anglo American said in a statement later on Monday it would oppose Codelco's