1. Faculty of Applied Sciences, Universiti Teknologi MARA, Shah Alam 40450, Malaysia
2. Institut fuer Organische Chemie, Universitaet Regensburg, Universitaetsstr. 31, Regensburg D-93053, Germany
3. Laboratory for Organic Reactivity, Discovery and Synthesis (LORDS), Research Center for the Natural and Applied Sciences, University of Santo Tomas, España St., Manila 1015, Philippines