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Communication | Regular issue | Vol 12, No. 7, 1979, pp.917-920
Published online, 1st January, 1970
DOI: 10.3987/R-1979-07-0917
Thermal Decomposition of 2H-[1,2,4]Oxadiazolo[2,3-a]pyridine-2-thione and 2H-[1,2,4]Oxadiazolo[2,3-b]pyridazine-2-thione

Akio Ohsawa, Heihachiro Arai, and Hiroshi Igeta*

*School of Pharmaceutical Sciences, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan


Pyrolysis of 2H-[1,2,4]oxadiazolo[2,3-a]pyridine-2-thione gave 3-(2-pyridyl)-2H-pyrido[1,2-a]-s-triazine-2,4(3H)-dione. 2-Isocyanatopyridine which is considered to be the intermediate in the reaction was utilized to the synthesis of N,N’-substituted ureas. Similar investigation was carried out on 2H-[1,2,4]oxadiazolo[2,3-b]pyridazine-2-thione.