Willgerodt-Kindler reaction at room temperature: Synthesis of thioamides from aromatic aldehydes and cyclic secondary amines
作者:Arun D. Kale、Yogesh A. Tayade、Sachin D. Mahale、Rahul D. Patil、Dipak S. Dalal
DOI:10.1016/j.tet.2019.130575
日期:2019.10
out Willgerodt-Kindlerreaction of aromatic aldehydes at room temperature. At 120 °C, it is catalyst free reaction with lower reaction time whereas at room temperature, due to the additional amine molecule, Willgerodt-Kindlerreaction of aromatic aldehydes is successfully carried out at room temperature. On gram-scale, the reaction is successfully attempted under both conditions with good yields.
Sulfated polyborate catalyzed Kindler reaction: a rapid, efficient, and green protocol
作者:Chetan K. Khatri、Anil S. Mali、Ganesh U. Chaturbhuj
DOI:10.1007/s00706-017-1944-6
日期:2017.8
AbstractA rapid, green, and efficient one-pot, three-component Kindler reaction was developed using a sulfated polyborate catalyst. The method described the reaction of aldehydes, amines/ammonium acetate, and sulfur for the synthesis of thioamides using sulfated polyborate under a solvent free condition at 100 °C. The key features of the present protocol are high yields, short reaction time, easy workup
Synthesis of N-substituted thioamides of benzoic acids under microwave activation
作者:S. D. Fazylov、O. A. Nurkenov、Zh. S. Akhmetkarimova、D. R. Zhienbaeva
DOI:10.1134/s1070363212040317
日期:2012.4
Thioamide derivatives are of particular interest since they are reactive compounds successfully used in organic synthesis of biologically active compounds. There are various synthetic approaches to thioamides. One of the most common is the Willgerodt–Kindler reac-tion [1, 2], which includes a prolonged reflux (2–4 h) of reaction mixture in DMF. In order to reduce the reaction time, we studied the reaction
硫代酰胺衍生物特别令人感兴趣,因为它们是成功用于生物活性化合物的有机合成的反应性化合物。硫代酰胺有多种合成方法。最常见的反应之一是 Willgerodt-Kindler 反应 [1, 2],其中包括反应混合物在 DMF 中的长时间回流(2-4 小时)。为了缩短反应时间,我们研究了取代苯甲醛与杂环仲胺、吗啉 I 和 1-苄基哌嗪 II 在硫 [3] 存在下在微波照射下的反应。反应在DMF培养基中进行以获得比较数据。DOI: 10.1134/S1070363212040317
Cellulose-reinforced poly(ethylene-<i>co</i>-vinyl acetate)-supported Ag nanoparticles with excellent catalytic properties: synthesis of thioamides using the Willgerodt–Kindler reaction
作者:Anoop Singh、Sanjeev Saini、Narinder Singh、Navneet Kaur、Doo Ok Jang
DOI:10.1039/d1ra09225a
日期:——
Fourier-transform infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray, and powder X-ray diffraction. Thereafter, the obtained hybrid was used as a catalyst for the Willgerodt–Kindlerreaction of aromatic aldehydes, amines, and S8 to synthesize thioamides with excellent yields. The developed catalytic system exhibited high stability and recyclability. Moreover, the mechanical properties
纤维素是一种生物衍生聚合物,广泛用于食品包装、染料去除、涂料和固载催化。多相催化剂在环境修复中起着至关重要的作用。在此背景下,对绿色和高性价比催化剂的需求迅速增加。本研究从稻草中提取纤维素,建立了一种高活性的固载催化模型。首先,纤维素与聚(乙烯-co-醋酸乙烯酯)(PEVA),然后将Ag纳米颗粒(AgNPs)插入纤维素-PEVA复合材料中。该过程涉及在硼氢化钠存在下还原 AgNPs。使用傅里叶变换红外光谱、扫描电子显微镜、能量色散 X 射线和粉末 X 射线衍射对制备的杂化催化剂进行了表征。此后,获得的杂化物被用作芳族醛、胺和 S 8的 Willgerodt-Kindler 反应的催化剂以优异的收率合成硫代酰胺。开发的催化体系表现出高稳定性和可回收性。此外,使用拉伸强度和冲击试验评估了混合催化剂的机械性能。还进行了数字图像的 RGB 分析以研究催化剂的主要成分。
Transamidation of thioamides with nucleophilic amines: thioamide N–C(S) activation by ground-state-destabilization
modifies the properties of valuable thioamide isosteres for the development of newmethods in organic synthesis. We fully expect that in analogy to the burgeoning field of destabilized amides introduced by our group in 2015, the thioamide bond ground-state-destabilization activation concept will find broad applications in various facets of chemical science, including metal-free, metal-catalyzed and metal-promoted