Diastereocontrolled Synthesis of Highly Functionalized Spiroketals: Application to the Synthesis of a Precursor of the C-12-C-25 Fragment of Bafilomycin A1 - Lopez, Roman; Poupon, Jean-Christophe; Prunet, Joëlle; Férézou, Jean-Pierre; Ricard, Louis (Synthesis, 2005)