Oxidative azacyclization of 1-monosubstituted thioureas in reaction with [bis(acyloxy)iodo]arenes to form 1,2,4-thiadiazole derivatives
摘要:
For the first time, derivatives of 1,2,4-thiadiazoles have been obtained by the reaction of [bis(acyloxy)iodo]arenes with 1-monosubstituted thioureas. 1-Acetylthiourea is subject to intermolecular azacyclization to form 3,5-bis-(acetylamino)-1,2,4-thiadiazole in reaction with [bis(acyloxy)iodo] benzene. 1-Phenylthiourea forms 3,5-bis-(phenylamino)-1,2,4-thiadiazole in a single-stage reaction with (diacetoxyiodo)benzene. The reaction of 1-phenylthiourea with [bis(trifluoroacetoxy)iodo]benzene leads to the formation of 5-imino-4-phenyl-3-phenylamino-4H-1,2,4-thiadiazoline. (C) 2003 Elsevier Ltd. All rights reserved.
External oxidant-free electrooxidative intramolecular S-N bond formation for one-pot synthesis for 3,5-disubstituted 1,2,4-thiadiazoles
作者:Qihao Zhong、Shouri Sheng、Junmin Chen
DOI:10.1080/10426507.2020.1768093
日期:2020.12.1
amidines or guanidines to give the corresponding imidoyl thioureas, which are further cyclized in situ via electrooxidativeintramolecular S-N bondformation to promote the final products. This protocol features a metal- and external oxidant-free approach, broad substrate scope, good functional group tolerance, excellent yields, and one-pot operation/reaction without the isolation of the intermediates
摘要 已在未分离的电解条件下开发了用于合成 5-氨基和 3,5-二氨基取代的 1,2,4-噻二唑衍生物的电化学氧化反应方案。新开发的一锅法涉及异硫氰酸酯与脒或胍反应生成相应的亚氨基硫脲,通过电氧化分子内 SN 键的形成进一步原位环化以促进最终产物。该协议具有无金属和无外部氧化剂的方法、广泛的底物范围、良好的官能团耐受性、优异的产量和一锅操作/反应,无需隔离中间体。图形概要
Synthesis of 5-Amino and 3,5-Diamino Substituted 1,2,4-Thiadiazoles by I<sub>2</sub>-Mediated Oxidative N–S Bond Formation
An oxidative N–S bondformation reaction has been established for 1,2,4-thiadiazole synthesis employing molecular iodine as the sole oxidant. The features of the present reaction include no use of transition metals, mild reaction conditions, simple operation, and short reaction time. This versatile synthetic approach is broadly applicable to a variety of imidoyl and guanyl thiourea substrates to produce
Joshua,C.P., Indian Journal of Chemistry, 1963, vol. 1, p. 391 - 394
作者:Joshua,C.P.
DOI:——
日期:——
455. Thiadiazoles. Part III. 3-amino-5-arylamino- and 3 : 5-di(aralkylamino)-1 : 2 : 4-thiadiazoles
作者:Frederick Kurzer
DOI:10.1039/jr9560002345
日期:——
Non-ATP competitive glycogen synthase kinase 3β (GSK-3β) inhibitors: Study of structural requirements for thiadiazolidinone derivatives
作者:Ana Castro、Arantxa Encinas、Carmen Gil、Stefan Bräse、Williams Porcal、Concepción Pérez、Francisco J. Moreno、Ana Martínez
DOI:10.1016/j.bmc.2007.09.016
日期:2008.1
The 2,4-disubstituted thiadiazolidinones (TDZD) were described as the first non-ATP competitive GSK-3 beta inhibitors. New modifications in this heterocyclic ring are here reported to study the influence on the biological activity. The basic skeleton of 1,2,4-thiadiazole and also one of the carbonyl groups are kept, while different modifications are introduced in positions 3 and 5, respectively. The GSK-3 beta activity of the new thiadiazole derivatives here synthesized showed IC50 values for some of the compounds in the micromolar range. Additionally, ATP competition studies have been carried out, showing that as well as the first generation of TDZD, these new compounds act in a non-competitive manner. With this study, additional requirements for the biological activity of the TDZD family have been delineated. (c) 2007 Elsevier Ltd. All rights reserved.