1. Université de Poitiers, UMR-CNRS 7285, IC2MP, Equipe Synthèse Organique-Groupe Superacide, 4 rue Michel Brunet, TSA 51106, 86073 Poitiers Cedex 9, France
2. Laboratory of Organic Synthesis, Bio and Organocatalysis, Chemistry Department, Universidad de los Andes, Bogotá, Colombia
3. Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo 113-0033, Japan