130720-56-8Relevant articles and documents
1-arylamino-1H-imidazoles by "oxidative reduction" - Conversion of 1-arylamino-2,3-dihydro-1H-Imidazole-2-thiones
Schantl, Joachim G.,Lagoja, Irene M.
, p. 929 - 938 (2007/10/03)
Desulfurization of the thione function of N-arylthiosemicarbazides incorporated in a heterocyclic ring was achieved with 30 % hydrogen peroxide in acetic acid. This reagent proved superior for the title transformation of thiones (1) into 2-unsubstituted 1
1,2,3-Triazolium-1-unsubstituted methanides, carbon analogues of triazole-N-oxides: A 1,3-dipole cascade from 1,2,3-triazolium-1-methanide to 1,2,4-triazinium-4-methanide: New routes to pyrrolo[1,2-c] [1,2,3]triazoles, pyrrolo[1,2-d] [1,2,4]triazines and substituted 1-aminopyrroles. Azolium 1,3-dipoles
Butler, Richard N.,McDonald, Peter D.,McArdle, Patrick,Cunningham, Desmond
, p. 1617 - 1621 (2007/10/03)
A 1,2,3-triazolium-1-methanide species has been generated and trapped in cycloadditions with alkyne dipolarophiles. The triazolium-1-methanide, a direct carbon analogue of the triazole-N-oxide, is an unstable intermediate prone to ring-opening and re-cyclisation to a 1,2,4-triazine system. New routes to substituted pyrrolo[1,2-c][1,2,3]triazoles, pyrrolo[1,2-d][1,2,4]triazines and substituted 1-aminopyrroles have resulted from this work. X-Ray crystal structures are described for 1,3,3a-triphenyl-4,5-diethoxycarbonyl-3a,6-dihydropyrrolo[1,2-c][1,2,3]triazole 6a, 1-N-anilino-2-phenyl-3,4-diethoxycarbonylpyrrole 9a and 3-(p-methoxyphenyl)-1,8a-diphenyl-8-exo-ethoxycarbonyl-3,4,6,7,8,8a- hexahydropyrrolo [1,2-d][1,2,4] triazine 15d.
1,2,3-Triazolium-1-oxide, -1-imide and 1-methanide Hetero-1,3,5-triene Equilibrium: Ab Initio Calculations. A New Base Induced Ring Expansion of 1-Alkyl-1,2,3-triazolium Salts to 2,3-Dihydro-1,2,4-triazines and 1-Amino-imidazoles via the 1,2,5-Triazahexa-1,3,5-triene System. Azolium 1,3-
Butler, Richard N.,Duffy, J. Paul,Cunningham, Desmond,McArdle, Patrick,Burke, Luke A.
, p. 147 - 152 (2007/10/02)
Treatment of substituted 1-methyl- and 1-trimethylsilylmethyl-1,2,3-triazolium salts with ethoxide and caesium fluoride respectively gave substituted 2,3-dihydro-1,2,4-triazines and 1-aminoimidazoles via 1,2,5-triazahexa-1,3,5-triene intermediates.Expected isomeric 1,2,3-triazolium-1-methanide 1,3-dipoles were not detected and ab initio calculations suggested that they are thermodynamically unfavoured.Ab initio calculations on the equilibrium between the acyclic hetero-1,3,5-triene system and the cyclic forms of 1,2,3-triazolium-1-oxide, -1-imide and -1-methanide are reported.X-ray crystal structures are described for 2,5,6-triphenyl-2,3-dihydro-1,2,4-triazine 6a and 1-(p-nitroanilino)-4,5-diphenylimidazole 11c.
