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Paper | Regular issue | Vol 31, No. 2, 1990, pp.277-281
Published online, 1st January, 1970
DOI: 10.3987/COM-89-5219
Synthesis of 8-Nitro- and 7-Methoxy-8-nitro-1,2,4-triazolo[1,5-c]pyrimidines

Olivier Rousseaux, Dominique Blondeau, and Henri Sliwa*

*Laboratoire de Chimie Organique Physique, Université des Sciences et Technologies de Lille, Flandres-Artois, F 59655 Villeneuve d’ Ascq Cedex, France


4-Hydrazino-5-nitropyrimidine and its 6-methoxy derivative were condensed under heating with ethyl orthoformate to afford the title compounds through the intermediacy of an imino ether. In both cases the first formed 1,2,4-triazolo[4,3-c]pyrimidines were not isolated and directly converted to their [1,5-c] isomer by a Dimroth rearrangement.