Thiadiazolium ylides: Substituted 2H-1,3,5-thiadiazines and 1,4,5-trisubstituted-imidazoles from 1,2,4- and 1,2,5-thiadiazolium-2-unsubstituted methanide (ylide) systems: ring expansions and ring interconversions via sulfur-nitrogen heterotriene intermediates. Mechanistic ab initio calculations. Azolium 1,3-dipoles
Aerobic Visible‐Light Induced Intermolecular S−N Bond Construction: Synthesis of 1,2,4‐Thiadiazoles from Thioamides under Photosensitizer‐Free Conditions
作者:Liang Zhuo、Shihua Xie、Hui Wang、Hongjun Zhu
DOI:10.1002/ejoc.202100440
日期:2021.6.21
A green approach for S−Nconstruction with concomitant synthesis of1,2,4-thiadiazoles was developed by visible-light induced oxidative cyclization of thioamidesunder photosensitizer-free conditions.
An Unexpected Result of the Reaction of Benzothioamide Derivatives with 2-Aryl-2-bromoacetonitriles
作者:Hassan Zali Boeini、Mehdi Mobin
DOI:10.1002/hlca.201100110
日期:2011.11
Unexpectedly, in the reaction of 2‐bromo‐2‐phenylacetonitrile derivatives with 2 mol‐equiv. of benzothioamide in DMSO, 3,5‐diaryl‐1,2,4‐thiadiazoles were obtained in excellent yields (83–90%) and in short reaction times (5–10 min). It is found that, in DMF, a quite different reaction takes place and 2,5‐diaryl‐1,3‐thiazol‐4‐amines are formed as the main products.
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.
TCT-DMSO/[bmim]BF4: A novel promoter system for the synthesis of 3,5-diaryl-1,2,4-thiadiazoles at ambient temperature
作者:Ahmad R. Khosropour、Jalil Noei
DOI:10.1002/jhet.261
日期:2011.1
efficient and practical procedure for direct synthesis of 3,5‐diaryl‐1,2,4‐thiadiazoles by thioamides with 2,4,6‐trichloro‐1,3,5‐triazine (TCT) and dimethylsulfoxide using 1‐butyl‐3‐methylimidazolium tetrafluoroborate as an eco‐friendly reaction medium under ambient temperature is described. This protocol can be considered as a newprocedure for 3,5‐diaryl‐1,2,4‐thiadiazoles synthesis. J. Heterocyclic Chem
Copper(II)-Mediated Homocoupling of Thioamides for the Synthesis of 1,2,4-Thiadiazoles
作者:Yadong Sun、Wanqing Wu、Huanfeng Jiang
DOI:10.1002/ejoc.201402194
日期:2014.7
A copper(II)-mediated highly selective oxidative cyclization reaction of thioamides to provide 3,5-disubstituted 1,2,4-thiadiazoles was developed. The copper species plays a key role in this transformation and different functional groups are tolerated under the optimal reaction conditions.
开发了铜 (II) 介导的硫代酰胺的高选择性氧化环化反应,以提供 3,5-二取代的 1,2,4-噻二唑。铜物种在这种转化中起着关键作用,并且在最佳反应条件下可以容忍不同的官能团。