Stereoselective Synthesis of 2,2,6,6-Tetrasubstituted Tetrahydropyrans - Díez Martín, David; Marcos, Isidro S; Basabe, Pilar; Romero, Ricardo E; Moro, Rosalina F; Lumeras, Wenceslao; Rodríguez, Lucena; Urones, Julio G (Synthesis, 2001)