FeCl3-promoted synthesis of 1,3,4-thiadiazoles under combined microwave and ultrasound irradiation in water
作者:Huangdi Feng、Xili Ying、Yanqing Peng、Erik V. Van der Eycken、Chuanduo Liu、Shanshan Zhao、Gonghua Song
DOI:10.1007/s00706-012-0846-x
日期:2013.5
AbstractAn eco-friendly and efficient synthesis of substituted 1,3,4-thiadiazole derivatives has been developed. This aqueous heterogeneous approach proceeds smoothly and quickly under combined microwave and ultrasound irradiation in the presence of FeCl3. Graphical Abstract
Dithiocarbamate as an efficient intermediate for the synthesis of 2-amino-1,3,4-thiadiazoles in water
作者:Fezzeh Aryanasab、Azim Ziyaei Halimehjani、Mohammad R. Saidi
DOI:10.1016/j.tetlet.2009.11.100
日期:2010.2
A new and facile protocol for the synthesis of 2-amino-1,3,4-thiadiazoles in water is described. Reaction of acid hydrazides with easily prepared dithiocarbamates gives the corresponding thiadiazoles in moderate to excellent yields. 2-Amino-1,3,4-oxadiazoles were not observed as side products using this procedure.
Synthesis of 2-amino-substituted-1,3,4-thiadiazoles via 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) mediated intramolecular C–S bond formation in thiosemicarbazones
作者:Sarangthem Joychandra Singh、Suresh Rajamanickam、Anupal Gogoi、Bhisma K. Patel
DOI:10.1016/j.tetlet.2016.01.083
日期:2016.3
An effective oxidative intramolecular cyclization (C–S bondformation) of thiosemicarbazones using 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) has been developed to afford a diverse array of 2-amino-substituted-1,3,4-thiadiazoles. The attractive features of this protocol are operational simplicity, obviates the need of expensive transition-metal catalysts and broad substrate scope.
and facile visible-light mediated protocol for the synthesis of 2-arylamino-5-aryl-1,3,4- thiadiazoles via one-potcondensation and intramolecular C–S coupling cascade reaction has been developed. This protocol is mild, practical, metal-free and exogenous oxidant-free, and only involves Eosin Y as photocatalyst using oxygen as the sole terminal oxidant. This protocol exhibits synthetic simplicity, broad
摘要 开发了一种通用且简便的可见光介导方案,用于通过一锅缩合和分子内 C-S 偶联级联反应合成 2-arylamino-5-aryl-1,3,4- 噻二唑。该协议温和、实用、不含金属和外源氧化剂,仅涉及曙红 Y 作为光催化剂,使用氧气作为唯一的终端氧化剂。该协议展示了合成的简单性、广泛的底物范围和出色的功能组兼容性。还可以以令人满意的产率促进克级合成,这开辟了实际应用的可能性。
Complexes of silicon and phosphorus chlorides with nitrogen-containing bases as the condensing agents in the synthesis of amides
作者:L. V. Besgubenko、S. E. Pipko、A. D. Sinitsa
DOI:10.1134/s1070363212080099
日期:2012.8
High effectiveness of new condensing agents on the basis of complexes of silicon and phosphorus chlorides with nitrogen-containing bases in the synthesis of amides from carboxylic acids and amines and also in heterocyclization is shown. Factors affecting the readiness of formation of the amide bond and the yields of the final products are established.