1. Department of Organic Chemistry University of Geneva Quai Ernest Ansermet 30 CH-1211 Geneva 4 Switzerland
2. National Centre of Competence in Research (NCCR) Chemical Biology Quai Ernest Ansermet 30 CH-1211 Geneva 4 Switzerland
3. Laboratory of Catalysis and Organic Synthesis Ecole Polytechnique Fédérale de Lausanne EPFL SB ISIC LCSO BCH 4306 1015 Lausanne Switzerland