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.