Prehispanolone Analogs: Stereochemistry Control at C-5 in the Preparation of 1-Oxaspiro[4,5]decane Fused Systems and Related Compounds - Basabe, Pilar; Estrella, Antonio; Marcos, Isidro S; Díez, David; Lithgow, Anna M; White, A J P; Williams, David J; Urones, Julio G (Synlett, 2001)