One-pot Synthesis of 1,6-Naphthyridinines, Pyranopyridines and Thiopyranopyridines Research Authors Fatma k. Abdel-Wadood, Maisa I. Abdel-Monem, Atiat M. Fahmy, and Ahmed A. Geies Research Journal Z. NaturForsch Research Pages 9 Research Rank 1 Research Year 2008