L. Bonsignore et al., SYNTHESIS OF TRIAZOLIDINE-1,3,5,7-TETRAONE AND PYRIMIDIN[1,5]DIAZEPINE DERIVATIVES BY CARBON SUBOXIDE, Heterocycles, 41(2), 1995, pp. 303-308
A one step synthesis of olidin[1,2-a][1,2,4]triazolidine-1,3,5,7-tetra
ones and pyrimidino[1,5]diaza- and thiazepines by carbon suboxide is h
ere described.