This phase II trial is studying how well giving 3-AP together with fludarabine works in treating patients with myeloproliferative disorders (MPD), chronic myelomonocytic leukemia (CMML), or accelerated phase or blastic phase chronic myelogenous leukemia. Drugs used in chemotherapy, such as 3-AP and fludarabine, work in different ways to stop the growth of cancer cells, either by killing the cells or by stopping them from dividing. 3-AP may help fludarabine work better by making cancer cells more sensitive to the drug. 3-AP and fludarabine may also stop the growth of cancer cells by blocking some of the enzymes needed for cell growth. Giving 3-AP together with fludarabine may kill more cancer cells.