Mohamed, M. A.; Abdelall, E. K. A.; Zaki, Y. H.; Abdelhamid, A. O. Synthesis of Some New of thieno[2,3-b]pyridines, pyrazolo[1,5-a]pyrimidine, [1,2,4]triazolo[1,5-a]pyrimidine, pyrazolo[5,1-c]triazine and pyrimido[1,2-a]benzimidazole Derivatives Containing Pyridine Moiety. Eur. J. Chem. 2011, 2, 509-513.