Reaction of 2-substituted 5-imino-7-oxo-1,3,4-thiadiazolo[3,2-
a]pyrimidines with pentane-2,4-dione in polyphosphoric acid yields 9-oxo-1,3,4-thiadiazolo[3,2-
a]pyrido[3,2-
e]pyrimidines.
Key words 5-imino-7-oxo-1,3,4-thiadiazolo[3,2-a]pyrimidine - pentane-2,4-dione - polyphosphoric acid - cyclodehydration - 9-oxo-1,3,4-thiadiazoio[3,2-a]pyrido[3,2-e]pyrimidines
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 2037–2038, October, 1995.
The authors are grateful to V. A. Dorokhov for the skilled preparation of the paper for publication.