Compounds for treating proliferative disorders

Compounds of formula (I), (III), (IV), (VII), (X), (XI), (XII), (XIII), and (XIV) (variables defined in the claims) A method of using a compound of the invention for the treatment of a subject having a proliferative disorder, such as cancer, and a method of treating a disorder responsive to Hsp70 induction and / or natural killer induction Is disclosed. Further disclosed are pharmaceutical compositions comprising a compound of the present invention and a pharmaceutically acceptable carrier.