Antimitotic agents that target tubulin and microtuble formation and inhibit the mitotic arrest of eucaryotic cells are a class of antitumor agents, which are important components of current anticancer therapy, and can be classified into a several classes such as microtubule stabilizing agents, and vinca and colchicine site binding agents. Recently much effort has been directed to the isolation and synthesis of new antimitotic drugs that target the tubulin/ microtubule system and display efficacy against drug-refractory carcinomas.