H
<sub>2</sub>
O
<sub>2</sub>
‐Mediated Synthesis of 1,2,4‐Thiadiazole Derivatives in Ethanol at Room Temperature
作者:Xian‐Ting Cao、Zuo‐Ling Zheng、Jie Liu、Yu‐He Hu、Hao‐Yun Yu、Shasha Cai、Guannan Wang
DOI:10.1002/adsc.202101455
日期:2022.2
Herein, we report the H2O2-mediated synthesis of 1,2,4-thiadiazole derivatives under metal-free conditions at roomtemperature with ethanol as the sole solvent. Various substrates could undergo the reaction smoothly, providing the expected yields of the desired products. Moreover, the target products were obtained by filtration or extraction instead of column chromatography, which requires a large
在此,我们报告了 H 2 O 2介导的 1,2,4-噻二唑衍生物在室温下无金属条件下以乙醇为唯一溶剂的合成。各种底物可以顺利进行反应,提供预期产物的预期产率。此外,目标产物是通过过滤或萃取代替柱层析获得的,在纯化过程中需要大量的有机溶液和硅胶。所开发的合成方法可用于大规模制备 1,2,4-噻二唑衍生物作为农用化学品、药物和功能材料。
Hypervalent Iodine(III) Mediated Synthesis of 3-Substituted 5-Amino-1,2,4-thiadiazoles through Intramolecular Oxidative S–N Bond Formation
An efficient synthesis of 3-substituted-5-arylamino-1,2,4-thiadiazoles through intramolecular oxidative S–N bond formation of imidoyl thioureas by phenyliodine(III) bis(trifluoroacetate) is reported. The protocol features a metal-free approach, broad substrate scope, very short reaction times, good to excellent yields, and simple starting materials.
Co-Catalyzed Intramolecular S-N Bond Formation in Water for 1,2-Benzisothiazol-3(<i>2H</i>
)-ones and 1,2,4-Thiadiazoles Synthesis
作者:Liting Yang、Lijuan Song、Shanyu Tang、Longjia Li、Heng Li、Bingxin Yuan、Guanyu Yang
DOI:10.1002/ejoc.201801642
日期:2019.2.14
Sustainable synthesis of 1,2‐benzisothiazol‐3(2H)‐ones and 1,2,4‐thiadiazoles via intramolecular S‐N bond formation were realized in aqueous media with good to excellent yields, which used tetra‐sulfonated cobalt phthalocyanine as a catalyst and molecularoxygen as the environment friendly oxidant.
I<sub>2</sub>-Mediated Oxidative C–N and N–S Bond Formation in Water: A Metal-Free Synthesis of 4,5-Disubstituted/N-Fused 3-Amino-1,2,4-triazoles and 3-Substituted 5-Amino-1,2,4-thiadiazoles
environmentally benign and convenient strategy for the synthesis of 4,5-disubstituted/N-fused 3-amino-1,2,4-triazoles and 3-substituted 5-amino-1,2,4-thiadiazoles from isothiocyanates has been developed. This metal-free method involves I2-mediated oxidative C–N and N–S bond formations in water. Furthermore, this facile protocol exhibited excellent substrate tolerance in good to high yields and scalable fashion
A simple and practical method for the one‐potsynthesis of 3‐aryl‐5‐amino‐1,2,4‐thiadiazoles from imidates and thioureas has been developed. The protocol proceeds through sequential base‐mediated nucleophilic addition‐elimination reactions and an I2‐mediated oxidative coupling for the N–S bond formation.