Silica-Supported Dichlorophosphate as a Recoverable Cyclodehydrant: Expeditious Synthesis of [1,2,4]Triazolo[3,4-b][1,3,4]thiadiazoles Under Microwave Irradiation
摘要:
An expeditious novel approach to 3,6-disubstituted [1,2,4]triazolo[3,4-b][1,3,4]thiadiazoles using silica-supported dichlorophosphate as a recoverable cyclodehydrant, carboxylic acids and thiocarbohydrazide as starting materials, and microwave irradiation as thermal source was described. The protocol has advantages of concise synthetic step, short time, good yield, easy workup procedure, and no environmental pollution.
Unprecedented conversion of (Z)-3-chloro-3-arylacrylic acids to benzoic acids: synthesis of s-triazolo[3,4-b][1,3,4]thiadiazoles
作者:Seema Sahi、Madhvi Bhardwaj、Satya Paul
DOI:10.1016/j.tetlet.2014.05.059
日期:2014.7
An unprecedented method for the conversion of (Z)-3-chloro-3-arylacrylic acids to corresponding benzoic acids by stirring in POCl3 at 80 degrees C is reported. The benzoic acids formed in situ undergo condensation with 4-amino-5-aryl-3-mercapto-1,2,4-triazoles to yield s-triazolo[3,4-b][1,3,4]thiadiazoles in high yields. (C) 2014 Elsevier Ltd. All rights reserved.
Anodic formation of 3,6-diaryl-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazoles and 2(3-aryl-5-methyl-1H-[1,2,4]triazol-1-yl)-5-aryl-1,3,4-thiadiazoles
作者:Belen Batanero、Rebeca Saez、Fructuoso Barba
DOI:10.1016/j.tet.2011.02.084
日期:2011.4
3,6-Disubstituted 1,2,4-triazolo[3,4-b][1,3,4]thiadiazoles together with the unknown systems 2-(3-aryl-5-methyl-1H-[1,2,4]triazol-1-yl)-5-aryl-1,3,4-thiadiazoles were obtained by anodic oxidation, under aprotic conditions, of aryl aldehyde N-(5-aryl-1,3,4-thiadiazol-2-yl) hydrazones. Mechanistic proposals are given. (C) 2011 Elsevier Ltd. All rights reserved.
Silica-Supported Dichlorophosphate as a Recoverable Cyclodehydrant: Expeditious Synthesis of [1,2,4]Triazolo[3,4-<i>b</i>][1,3,4]thiadiazoles Under Microwave Irradiation
作者:Zheng Li、Yanlong Zhao
DOI:10.1080/00397910902838912
日期:2009.10.12
An expeditious novel approach to 3,6-disubstituted [1,2,4]triazolo[3,4-b][1,3,4]thiadiazoles using silica-supported dichlorophosphate as a recoverable cyclodehydrant, carboxylic acids and thiocarbohydrazide as starting materials, and microwave irradiation as thermal source was described. The protocol has advantages of concise synthetic step, short time, good yield, easy workup procedure, and no environmental pollution.