这项工作的目的是使人们对在硫代苯甲腈的硫代酰基部分的硫酰基部分的取代与其抗结核作用之间的关系的初步发现有更多的了解。因此,我们制备了一套14种衍生物,其中有8种尚未被报道,并且对这四种化合物对四种分枝杆菌的抗分枝杆菌活性进行了评估,其中包括结核分枝杆菌CNCTC My 331/88,堪萨斯分枝杆菌CNCTC My 235。 / 80,鸟分枝杆菌CNCTC My 330/88和堪萨斯分枝杆菌6509/96。尽管第3位具有不同电子和亲脂特性的取代基对抗结核活性的贡献可以忽略不计,
Switching from Biaryl Formation to Amidation with Convoluted Polymeric Nickel Catalysis
作者:Abhijit Sen、Raghu N. Dhital、Takuma Sato、Aya Ohno、Yoichi M. A. Yamada
DOI:10.1021/acscatal.0c03888
日期:2020.12
and we confirmed that it is consistent with Ni K-edge EXAFS. The Suzuki–Miyaura-type coupling of aryl halides and arylboronicesters proceeded using P4VP-NiCl2 (0.1 mol % Ni) to give the corresponding biaryl compounds in up to 94% yield. Surprisingly, when the same reaction of aryl halides and arylboronicacid/ester was carried out in the presence of amides, the amidation proceeded predominantly to
immobilised on a supported ionic liquid phase (SILP) with adsorbed 1-butyl-4-methylpyridinium chloride, was investigated in aminocarbonylation reactions. Double carbonylation was found to be the main reaction using different iodoarenes and aliphatic amines as substrates. Application of anilinederivatives as nucleophiles led to the exclusive formation of substituted benzamides. The stabilisation effect
Mono- and double carbonylation of aryl iodides with amine nucleophiles in the presence of recyclable palladium catalysts immobilised on a supported dicationic ionic liquid phase
Silica modified with organic dicationic moieties proved to be an excellent support for palladium catalysts used in the aminocarbonylation of aryl iodides.
The first heterogeneous carbonylation reaction carried out with palladiumcatalysts immobilised on phosphonium ion modified silica supports is reported. The supported ionic liquidphases were characterised by solid state NMR and FT-IR measurements. The presence of the phosphonium ions on the surface made it possible to carry out double carbonylation in apolar toluene efficiently that resulted in reduced
Palladium nanoparticles on a pyridinium supported ionic liquid phase: a recyclable and low-leaching palladium catalyst for aminocarbonylation reactions
A new SILP (Supported Ionic Liquid Phase) palladiumcatalyst was prepared and characterized by 13C and 29Si CP MAS NMR, DTG, FTIR and TEM. The presence of the grafted pyridinium cations on the surface of the support was found to result in the formation of highly dispersed Pd nanoparticles with their diameter in the range of 1–2 nm. The catalyst was proved to be active not only in the aminocarbonylation
制备了一种新型 SILP(负载型离子液相)钯催化剂,并通过13 C 和29表征Si CP MAS NMR、DTG、FTIR 和 TEM。发现载体表面上接枝吡啶鎓阳离子的存在导致形成高度分散的 Pd 纳米粒子,其直径在 1-2 nm 范围内。该催化剂被证明不仅在一些模型化合物的氨基羰基化中具有活性,而且在活性药物成分的合成中也具有活性。首次在氨基羰基化中进行催化剂回收和钯浸出研究,生成 CX-546(1-(1,4-benzodioxan-6-ylcarbonyl)piperidine)、吗氯贝胺、Nikethamide 和非那雄胺的前体。后一反应证明,在多相催化剂的帮助下,不仅芳基碘化物,而且碘代烯烃都可以转化为产物。结果表明,在不同底物的反应中,应始终对条件进行微调,以达到最佳结果。还观察到钯损失在很大程度上取决于反应伙伴的性质。