Collect. Czech. Chem. Commun. 1983, 48, 1465-1476

3-(4-Methylpiperazino)dibenzo[b,f]-1,2,4-triazolo[4,3-d]-1,4-thiazepine and its 6-chloro and 12-chloro derivatives; Synthesis and pharmacology

Zdeněk Polívka, Jiří Holubek, Emil Svátek, Antonín Dlabač, Dušan Půček, Zdeněk Šedivý and Miroslav Protiva

Research Institute for Pharmacy and Biochemistry, 130 60 Prague 3


Dibenzo[b,f]-1,4-thiazepin-11(10H)-ones IIa-IIc reacted with phosphorus pentasulfide in pyridine under the formation of the thiones IIIa-IIIc which were transformed by treatment with hydrazine hydrate in 1-butanol to the hydrazine derivatives IVa-IVc. Reactions with triethyl orthoformate in ethanol in the presence of sulfuric acid effected cyclization to dibenzo[b,f]-1,2,4-triazolo[4,3-d]-1,4-thiazepine (Va) and its chloro derivatives Vb, Vc which were treated with bromine in a boiling mixture of chlorofom and pyridine and gave the 3-bromo derivatives VIa-VIc. The title compounds Ia-Ic were obtained by substitution reactions with an excess of boiling 1-methylpiperazine. An attempt at preparing an analogous 14H-dibenzo[b,g]-1,2,4-triazolo[4,3-d]-1,4-thiazocine derivative was discontinued in the stage of reaction of the thione X with hydrazine hydrate which resulted in the azine XI. Compounds Ia-Ic on intravenous administration are highly toxic and inactive in tests for CNS effects; compound Ic showed a clear anticholinergic activity.