87522-16-5Relevant academic research and scientific papers
Bridgehead Nitrogen Heterocycles. Synthesis of Triazolopyridin-1-ium and Pyridotriazin-9-ium Derivatives
Molina, Pedro,Tarraga, Alberto,Vilaplana, Maria Jesus,Hurtado, Emilia,Lorenzo, Mercedes
, p. 1395 - 1399 (1983)
A number of derivatives of brigehead nitrogen heterocycles from pyrylium salts and amidrazones have been prepared. 2-Methylthio-4,6-diphenylpyrylium tetrafluoroborate (13) reacts with N3-aryl substituted amidazones to yield derivatives of triazolopyridin-1-ium tetrafluoroborates . 2-Ethoxycarbonyl-4,6-diphenylpyrylium (14) reacts with N3-aryl substituted amidrazones to give 4-oxopyridotriazin-9-ium derivatives .Compound (14) also reacts under neutral conditions with unsubstituted amidrazones to yield the corresponding pyridinium salts ; these cyclised on treatment with base giving the zwitterionic 4-oxidopyridotriazin-9-ium compounds .
