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2005
Pyridine derivatives
R 0380
Synthesis of Some New Pyridines, Thienopyridines and Pyrido[2,3:4',5']thifrom 2-Acetylbenzoimidazole. — Chalcone ana33- 153 eno[3',2'-d]pyrimidin-8-ones
logues (I) are treated with various types of reagents to afford the target compounds by
initial addition of active methylene or amino groups to the double bond followed by
cyclization. Heating of (XV) with aryl aldehydes in the presence of NH4OAc results
also in formation of pyridine derivatives (XVI). In aqueous ethanolic NaOH solution
intermediate diones (XVIII) are isolated which further undergo ring closure to (XVII).
— (HASSANIEN*, A. Z. A.; IBRAHIM, E.-S. I.; AFIFI, M. E.; Croat. Chem. Acta
78 (2005) 1, 63-70; Dep. Chem., Fac. Educ., Suez Canal Univ., Arish, Egypt; Eng.)
— S. Adam
2005
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