Abstract: The total synthesis of the antitumor title compound has been accomplished. Among the key steps was an iodolactonization of a cyclohexadiene bearing a neighboring carboxamido group mediated by an ortho-stannylated phenol (see 16-. 17). A series of cis vicinal functionalization reactions were used to control stereochemistry. The scheme was applicable as a consequence of an intervening Overman rearrangement of a highly ...