[GRAPHICS]The first total synthesis of mosin B and a diastereomer was accomplished using asymmetric desymmetrization of the sigma -symmetric diol and the Nozaki-Hiyama-Kishi reaction as the key steps. The THF core segment was stereoselectively constructed employing a stereodivergent synthesis starting from a common intermediate, 4-cyclohexene-1,2-diol, based on a desymmetrization strategy. By virtue of these synthetic results, it is suggested that the absolute configuration is 1a.
Total Synthesis of the Antitumor Acetogenin Mosin B: Desymmetrization Approach to the Stereodivergent Synthesis of threo/trans/erythro-Type Acetogenins
A total synthesis of the threo/trans/erythro-type acetogenin mosin B and one of its diastereomers has been achieved. The carbon skeleton is assembled in a convergent fashion from two segments (a THF ring segment and a gamma-lactone segment) through the Nozaki-Hiyama-Kishi reaction. The THF ring segment was stereoselectively constructed by a stereodivergentsynthesis starting from a common intermediate