- Photochemical synthesis of s-triazolo[3,4-b]benzothiazole and mechanistic studies on benzothiazole formation
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A general photochemical synthesis of s-triazolo[3,4-b]benzothizoles from 4,5-disubstituted 1,2,4-triazole-3-thione is described. Steady photolysis, quantum yield determination, and laser flash photolysis experiments have been carried out. An intermolecular electron transfer mechanism has been proposed.
- Jayanthi,Muthusamy,Paramasivam,Ramakrishnan,Ramasamy,Ramamurthy
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- Convenient synthesis of benzo[4,5]thiazolo[2,3-c][1,2,4]triazoles with 1 mol% CuCl2·2H2O as catalyst in water
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A convenient and efficient procedure for the synthesis of benzo[4,5]thiazolo [2,3-c][1,2,4]triazoles has been developed via a tandem intermolecular C-N bond and intramolecular C-S bond formation sequence from o-bromo-arylisothiocyanates and aroylhydrazides. A series of benzo[4,5]thiazolo[2,3-c][1,2,4]triazoles were provided in excellent overall yields with 1 mol% CuCl2·2H2O/1 mol% 1,10-phenanthroline as the catalyst and water as the solvent. This journal is
- Wen, Li-Rong,Li, Shou-Lei,Zhang, Jian,Li, Ming
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p. 1581 - 1588
(2015/03/18)
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- Study of oxidative cyclization using PhI(OAc)2 in the formation of benzo[4,5]thiazolo[2,3- C ][1,2,4]triazoles and related heterocycles - Scope and limitations
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A one-pot, two-step reaction for the synthesis of benzo[4,5]thiazolo[2,3-c] [1,2,4]triazoles and related heterocycles under mild conditions was herein developed. The key step of this transformation is an oxidative cyclization employing PhI(OAc)2/sub
- Demmer, Charles S.,Jorgensen, Morten,Kehler, Jan,Bunch, Lennart
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p. 1279 - 1282
(2014/06/10)
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- Synthesis of new triazolo and pyrazolo benzothiazoles
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Benzothiazole-2-thiol 1 on heating with excess of hydrazine hydrate yields 2-hydrazino-1,3-benzothiazole (2). Compound 2 on reaction with carbon disulfide in alkaline medium affords [1,2,4] triazolo [3,4-b] [1,3] benzothiazole-3-thiol (3). Condensation of 2 with various substituted aryl aldehydes yields corresponding hydrazine derivatives (4), which on cyclisation with acetic anhydride gave corresponding [1,2,4] triazolo [3,4-6] [1,3] benzothiazoles (5). Some other triazolo derivatives (6,7,8) of benzothiazole were obtained by the cyclization of 2 with benzoyl chloride, acetyl chloride and formic acid respectively. Again compound 2 on condensation with acetyl acetone and ethylacetoacetate gives pyrazolo derivatives (9,10) respectively. The synthesized compounds were characterized by elemental and spectral analysis.
- Deshmukh,Patil,Jadhav,Shejwal
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p. 163 - 166
(2013/09/23)
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- Thallium(III) salts mediated oxidative cyclization of arenecarbaldehyde benzothiazol-2-ylhydrazones to bridged head nitrogen heterocycles
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Oxidation of arenecarbaldehydebenzothiazol-2-ylhydrazones (4) with thallium (III) acetate in refluxing acetic acid, thallium (III) acetate and thallium (III) nitrate in acetonitrile in presence of p-toluene sulphonic acid afforded 3-aryl-1,2,4-triazolo [3
- Singh,George
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p. 2627 - 2635
(2007/10/02)
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