MICROWAVE-ASSISTED RAPID HYDROLYSIS AND PREPARATION OF THIOAMIDES BY WILLGERODT-KINDLER REACTION
摘要:
Aldehydes and aryl alkyl ketones were efficiently transformed to thioamides with the same number of carbon atoms via Willgerodt-Kindler reaction under microwave irradiation in solvent-free conditions. The thioamides obtained were hydrolyzed to corresponding carboxylic acids with microwave dielectric heating in one minute. Both reactions are very fast and the yields are excellent.
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。
Half-sandwich Ru(II)-thioamide complexes as catalysts for one pot synthesis of aromatic 1,5-diketones
作者:Haritha Rajasekaran、Peter Jerome、Eugene V. Eliseenkov、Vadim P. Boyarskiy、Nattamai Bhuvanesh、Ramasamy Karvembu
DOI:10.1016/j.jorganchem.2022.122322
日期:2022.5
Four Ru(II)-arene thioamide complexes of the type [(η6-cymene)Ru(PPh3)(L)]+ (L = bidentate monoanionic thioamide ligand) have been synthesized and isolated as their hexafluorophosphate salts. All these complexes are fully characterized by spectroscopic methods. Molecular structures of the ligands (HL2 and HL3) and complex (3) were determined by single crystal X-ray crystallography. The ligands coordinated
[( η 6 -伞花烃)Ru(PPh 3 )(L)] + ( L = 双齿单阴离子硫代酰胺配体)类型的四种Ru(II)-芳烃硫代酰胺配合物 已合成并分离为它们的六氟磷酸盐。所有这些配合物都通过光谱方法充分表征。配体 (HL2 和 HL3) 和复合物 ( 3 ) 的分子结构通过单晶 X 射线晶体学确定。配体通过酚O和硫代酰胺S原子与Ru中心配位。在 KO t Bu存在下,所有四种配合物均作为催化剂在芳香酮和醇的一锅法合成 1,5-二酮中进行了测试,并通过 GC/GC-MS/ 1对产物进行了分析。核磁共振氢谱。配合物1和2充当催化剂以产生 1,5-二酮,而配合物3和4催化反应形成烷基化酮。反应范围扩大到各种取代的醇和酮,用催化剂 1制备 1,5-二酮。
Palladium(II) O^S thioamide complexes catalyzed Guerbet type reaction: β-Alkylation of cyclohexanol with primary alcohols
Pd(II)-PPh3 complexes containing salicylaldehyde based thioamide ligands (1–3) have been synthesized and characterized by analytical and spectroscopic (FT-IR, UV–Visible, HR-MS and NMR) techniques. Spectroscopic methods revealed square planar geometry for all the complexes. These complexes were tested as catalysts for Guerbet-type reaction i.e. dialkylation of cyclohexanol with primary alcohols. The
Silver ion-mediated desulfurization of N-(2-hydroxythiobenzoyl)morpholine (1a) or -piperidine (1b) was used to develop a new synthetic method for heterocycles such as 1,3-benzoxazin-1-ium salts. 2-Amino-4-morpholino- and 2-amino-4-piperidino-1,3-benzoxazin-1-ium perchlorate (2a, 2b) or 2-(NN-dimethylamino)-4-morpholino- and 2-(N,N-dimethylamino)-4-piperidino-1,3-benzoxazin-1-ium perchlorate (3a, 3b) were obtained by treatment of la and 1b, respectively, with silver perchlorate in the presence of excess cyanamide or N,N-dimethylcyanamide, and the structure of 3a was confirmed by X-Ray crystallography. Desulfurization of 1 with AgOCN afforded 1,3-benzoxazin-2-ones (4). In addition, treatment of 1 with methyl cyanoacetate in the presence of silver trifluoroacetate and triethylamine gave 3-cyanochromen-2-ones (5).