Convenient Selective Synthesis of Substituted Pyrido[2,3-d]pyrimidones and Annulated Derivatives

Wafaa S. Hamama, Mohamed A. Ismail, Hana'a A. Al-Saman, Hanafi H. Zoorob
2007 Zeitschrift für Naturforschung. B, A journal of chemical sciences  
The reaction of 6-aminouracil (1) with the appropriate α,β -unsaturated ketones, gave the corresponding pyrido[2,3-d]pyrimidin-2,4-diones 3, 6, 8 and 10, respectively. Treatment of 1 with salicylaldehyde, 6-carboethoxy-3,5-diphenyl-2-cyclohexenone (13) or 2,6- bis(phenylmethylidene)cyclohexanone (15) afforded the corresponding pyrimido[4,5-d]quinoline- 2,4-diones 12, 14 and 16, respectively. Furthermore, a pyrido[2,3-d]pyrimidine incorporating 3,2'- bis(quinoline) derivative 18 was synthesized.
more » ... Annulation of pyrido[2,3-d]pyrimidine with pyrazole or imidazole moieties was achieved via reaction of 1 with benzylidene derivatives of pyrazolone, imidazolone or 3-carboethoxycoumarin (23) to give 21, 22 and 24, respectively.
doi:10.1515/znb-2007-0115 fatcat:jf5z2pdrmvarbl26lxmzbmacla