An Improved Synthesis of 1,3- and 1,4-Bis[5-aryl-1,3,4-oxadiazol-2-,y1]benzenes via Oxidation of Bis-aroylhydrazones of Iso- and Terephthalaldehyde with Lead(IV) Acetate
Synthesis and antibacterial activity of some novel bis-1,2,4-triazolo[3,4-b]-1,3,4-thiadiazoles and bis-4-thiazolidinone derivatives from terephthalic dihydrazide
作者:Vikrant S. Palekar、Amey J. Damle、S.R. Shukla
DOI:10.1016/j.ejmech.2009.07.023
日期:2009.12
A novel series of 1,4-bis(6-(substituted phenyl)-[1,2,4]-triazolo[3,4-b]-1,3,4-thiadiazoles (5a–b) and 4-bis(substituted phenyl)-4-thiazolidinone derivatives (7a–c) have been synthesized from terephthalic dihydrazide (1) through multistep reaction sequence. 1,4-Bis(5-aryl-1,3,4-oxadiazole-2yl) benzene derivatives (2a–f) and bis-substituted terephthalohydrazide (6a–e) were also synthesized from terephthalic
Novel syntheses of symmetrical 2,5-diaryl-1,3,4-oxadiazoles and 1,4-phenylenebis-1,3,4-oxadiazoles
作者:L. I. Belen'kii、S. I. Luiksaar、I. S. Poddubnyi、M. M. Krayushkin
DOI:10.1007/bf02494289
日期:1998.11
excess hydrazine hydrate in ethanol gives symmetrical 2,5-diaryl-1,3,4-oxadiazoles in 68–96% yields. The reaction of 1,4-bis(trichloromethyl)benzene with acylhydrazines in an ethanol-pyridine mixture gives the corresponding substituted or unsubstituted 1,4-phenylenebis-1,3,4-oxadiazoles in 35–51% yields. The mass spectra of 2,5-diaryl-1,3,4-oxadiazoles and 1,4-phenylenebis-1,3,4-oxadiazoles were studied
Zur acylierung von 5-aryl-tetrazolen; ein duplikationsverfahren zur darstellung von polyarylen
作者:J. Sauer、R. Huisgen、H.J. Sturm
DOI:10.1016/s0040-4020(01)93173-4
日期:1960.1
We have found that the thermolysis of 5-substituted-2-acyl-tetrazoles (I) at 60–110° leads to quantitative loss of nitrogen and formation of an N-acyl-nitrilimine (III) as a hypothetical intermediate. This immediately reacts via ring closure to form 1,3,4-oxadiazoles (IV) in excellent yields. By an elegant reaction series it is possible to form polyaryles with alternating phenyl and 1,3,4-oxadiazole