Convenient synthesis of benzo[4,5]thiazolo[2,3-c][1,2,4]triazoles with 1 mol% CuCl<sub>2</sub>·2H<sub>2</sub>O as catalyst in water
作者:Li-Rong Wen、Shou-Lei Li、Jian Zhang、Ming Li
DOI:10.1039/c4gc02156h
日期:——
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
通过串联分子间C–N键和分子内CS键形成序列,开发了一种便捷高效的合成苯并[4,5]噻唑并[2,3- c ] [1,2,4]三唑的方法由邻-溴-芳基异硫氰酸酯和芳酰肼得到。以1 mol%CuCl 2 ·2H 2 O / 1 mol%1,10-菲咯啉提供了一系列优异的总收率的一系列苯并[4,5]噻唑并[2,3- c ] [1,2,4]三唑作为催化剂,水作为溶剂。
The reactions of substituted benzothiazol-2-ylhydrazones with bromine: a route to s-triazolo[3,4-b][1,3]benzothiazoles
作者:R. N. Butler、P. O'Sullivan、F. L. Scott
DOI:10.1039/p19720001519
日期:——
benzothiazol-2-ylhydrazones with bromine depended on the molar ratio of the reactants and the reaction time. With 1 mol of bromine and short reaction times hydrazone bromonium bromides and perbromides were formed. With 0·5 mol of bromine and longer reaction times the products included hydrobromides, hydrazonyl bromides, and 6 -bromobenzothiazol-2-ylhydrazones. Cyclisations of the hydrazonyl bromides were
的反应产物p取代的苯甲醛苯并噻唑-2- ylhydrazones与溴依赖于反应物的摩尔比和反应时间。用1mol的溴和短的反应时间,形成了溴化hydr溴化物和过溴化物。在具有0·5mol的溴和更长的反应时间的情况下,产物包括氢溴酸盐,肼基溴化物和6-溴苯并噻唑-2-基hydr。对肼基溴化物的环化进行了研究,同时开发了母体与溴的单步环化,作为对s -triazolo [3,4- b ] [1,3]苯并噻唑的有效环化途径。
Thallium(III) Salts Mediated Oxidative Cyclization of Arenecarbaldehyde Benzothiazol-2-ylhydrazones to Bridged Head Nitrogen Heterocycles
作者:Om V. Singh、Varughese George
DOI:10.1080/00397919408010575
日期:1994.10
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[3,4-b]benzothiazoles (6) by intramolecular cyclization in high yield. A mechanistic scheme for this transformation has been proposed.
Photochemical Synthesis of s-Triazolo[3,4-<i>b</i>]benzothiazole and Mechanistic Studies on Benzothiazole Formation
作者:G. Jayanthi、S. Muthusamy、R. Paramasivam、V. T. Ramakrishnan、N. K. Ramasamy、P. Ramamurthy
DOI:10.1021/jo962190v
日期:1997.8.1
A general photochemical synthesis of s-triazolo[3,4-b]benzothiazoles 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 intramolecular electron transfer mechanism has been proposed.
Singh Om V., George Varughese, Synth. Commun, 24 (1994) N 18, S 2627-2635