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Enantioselective Annulation Using Nazarov Reagent: Synthesis of (+)-Preoleanatetraene

Alejandro F. Barrero*a, Simeón Arseniyadisb, José F. Quílez del Morala, M. Mar Herradora, Antonio Rosellóna
a Departament of Organic Chemistry, Institute of Biotechnology, University of Granada, Avda. Fuentenueva, 18071 Granada, Spain
Fax: +34(95)8243318; e-Mail: afbarre@goliat.ugr.es;
b Institute de Chimie de Substances Naturelles, CNRS, 91198 Gif-sur-Yvette, France