Features of reactions of (E)-1-(β-aroylvinyl)pyridinium bromides with binucleophiles
作者:R. Dzh. Khachikyan、Z. G. Ovakimyan、G. A. Panosyan、R. A. Tamazyan、A. G. Ayvazyan
DOI:10.1134/s1070363216070070
日期:2016.7
Regardless of pH and a solvent nature the reactions of (E)-1-(beta-aroylvinyl)pyridinium bromides with hydrazine led to the formation of pyrazole derivatives. The salts reacted with thiourea via intermediate formation of 4-arylpyrimidine-2-thiol to give (Z)-2-[(beta-aroylvinyl)sulfanyl]-4-arylpyrimidines. In the case of N,N'-diphenylthiourea the reaction provided 6-aryl-3-aroyl-1-phenylpyridinium bromides. Pyridine hydrobromide liberated in the reaction course has a major influence on the process chemoselectivity.