333773-18-5Relevant academic research and scientific papers
New approaches for the synthesis of 1,3,4-thiadiazole and 1,2,4-triazole derivatives with antimicrobial activity
Wardakhan, Wagnat W.,El-Sayed, Nahed N. E.
experimental part, p. 790 - 804 (2009/10/15)
The thiosemicarbazide derivatives 3a and 3b were cyclized in the presence of concentrated sulfuric acid to give the 5-cyanomethyl-1,3,4-thiadiazole derivatives 4a and 4b, respectively. The latter products were used for many heterocyclic transformations to
Heterocyclic synthesis containing bridgehead nitrogen atom: Synthesis of 3-[(2H)- 2-oxobenzo[b]pyran-3-yl]-s-triazolo[3,4-b]-1,3,4-thiadiazine and thiazole derivatives
Raslan
, p. 114 - 120 (2007/10/03)
The reaction of 2H-2-oxobenzo[b]-pyran-3-hydrazide (2) with carbon disulfide in basic DMF afforded potassium thiocarbamate 3, which readily underwent heterocyclization upon its reaction with hydrazine and/or phenacyl bromide to yield 1,2,4-tiazole (4) and thiazole 7 derivatives, respectively. Condensation of 4 with substituted phenacyl bromide and/or chloranil gave 1,2,4-triazole[3,4-b]thiadiazine (5a,b) and 3,10-bis-[2H-2-oxobenzo[b]pyran-3-yl]-6,13-dichloro-bis-[2H-2-oxobenzo[b]pyran-3 -yl]- 6,13-dichloro-bis-1,2,4-triazolo[3,4-b]-1,3,4-thiadiazino [5′,6′-b:5′,6′-e]cyclohexa-1,4-diene (6), respectively. Cyclization of thiosemicarbazide 10 by refluxing it in sodium hydroxide and/or phosphoryl chloride afforded triazole 13 and thiadiazole 15 derivatives, respectively. Also, 10 reacted with phenacyl bromide in the presence of anhydrous sodium acetate to give the oxothiazolidine derivative 17. The structure of the synthesized compounds were confirmed by elemental analyses, IR, 1H NMR, and mass spectra.
