Electrochemical Synthesis of 3,5‐Disubstituted‐1,2,4‐thiadiazoles through NH
<sub>4</sub>
I‐Mediated Dimerization of Thioamides
作者:Zi‐Qiang Wang、Xiu‐Jin Meng、Qian‐Yu Li、Hai‐Tao Tang、Heng‐Shan Wang、Ying‐Ming Pan
DOI:10.1002/adsc.201800871
日期:2018.11.5
A electrochemical method for the synthesis of 3,5‐disubstituted‐1,2,4‐thiadiazoles through NH4I‐mediated dimerization of thioamides is reported. Using the inexpensive NH4I as electrolyte and catalyst, this electrosynthesis approach requires no oxidizing agents and enables the convenient production of diverse 1,2,4‐thiadiazoles products. The approach is an example of S−N bond construction through the
produce superoxide radical anions under air and visiblelight, which mediate the photocatalytic oxidative amine coupling and cyclization of thioamide to 1,2,4-thiadiazole in moderate to high yield and high recyclability (18 examples). This study demonstrates the great capacity of fully conjugated COFs with a D–A structure for light-driven organic synthesis.
The facile and efficient organocatalytic platform for accessing 1,2,4-selenadiazoles and thiadiazoles under aerobic conditions
作者:V.P. Rama Kishore Putta、Raghuram Gujjarappa、Nagaraju Vodnala、Richa Gupta、Prasad P. Pujar、Chandi C. Malakar
DOI:10.1016/j.tetlet.2018.01.063
日期:2018.3
The first organocatalytic approach towards synthesis of rarely explored 1,2,4-selenadiazole and thiadiazole scaffolds have been devised using corresponding carboxamides as substrates. The transformations were realized using two distinct conditions in the presence of catalytic vitamin B3 or thiourea underaerobicconditions. Developed methods overcome the associated limitations of previous reported
Highly efficient synthesis of 1,2,4-thiadiazoles from thioamides utilizing tetra(<i>n</i>-butyl)ammonium peroxydisulfate
作者:Kieseung Lee、Richard S. Lee、Yong Hae Kim
DOI:10.1080/00397911.2020.1751854
日期:2020.6.17
Abstract A new synthetic approach to 1,2,4-thiadiazoles using tetra(n-butyl)ammonium peroxydisulfate via oxidative dimerization of thioamides is described. This new oxidative protocol is simple, highly efficient, and allows the practical synthesis of 1,2,4-thiadiazoles from various primary thioamides in good to excellent yields. Graphical Abstract