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.
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.