1. Laboratory of Organic Chemistry, School of Chemical Engineering, National Technical University of Athens, Zorgafou Campus, GR 157 73, Athens, Greece, Institute of Organic and Pharmaceutical Chemistry, National Hellenic Research Foundation, 48, Vas. Constantinou Avenue, Athens 116 35, Greece, and Department of Pharmaceutical Chemistry, School of Pharmacy, Aristotle University Thessaloniki, Thessaloniki 54124, Greece