I2/TBHP promoted oxidative C–N bond formation at room temperature: Divergent access of 2-substituted benzimidazoles involving ring distortion
作者:Moumita Saha、Asish R. Das
DOI:10.1016/j.tetlet.2018.05.028
日期:2018.6
A new ‘one pot’ tandemsynthesis of 2-substituted benzimidazoles has been developed from 2-aminobenzyl alcohol/2-aminobenzamide and different coupling partners (nitriles, aldehydes and 1,3-diketones) via iodine and TBHP promoted oxidative ringcontraction. The present strategy involves sequential C–N bond formation, cyclization, subsequent ringcontraction and dehydrogenation to afford various medicinally
Conventional and Microwave-Assisted Synthesis of Benzimidazole Derivatives and Their<i>In Vitro</i>Inhibition of Human Cyclooxygenase
作者:Daniela Secci、Adriana Bolasco、Melissa D'Ascenzio、Flavio della Sala、Matilde Yáñez、Simone Carradori
DOI:10.1002/jhet.1058
日期:2012.9
A large series of 1,2‐diaryl‐benzimidazole and 2‐aryl‐1H‐benzimidazolederivatives were synthesized with slight differences using both microwave irradiation and conventional heating methods. Usually higher yields and time reactions reduction were obtained with the former method. All compounds were assayed for their in vitro ability to inhibit humancyclooxygenases, and most of them showed an encouraging
Ruthenium(II)-catalyzed synthesis of 2-arylbenzimidazole and 2-arylbenzothiazole in water
作者:Keisham S. Singh、Francis Joy、Prabha Devi
DOI:10.1007/s11243-020-00435-3
日期:2021.3
of ruthenium(II)-catalyst under nitrogen without the use of additive in water. This reaction was extended to various heteroaromatic aldehydes obtaining up to 88% yield of the desired 2-arylbenzimidazoles/2-arylbenzothiazoles. In a few cases, a small amount of diarylated compounds was formed depending on the aldehydes used. Additionally, antibiotic properties of the synthesized compounds have been screened
苯并咪唑/苯并噻唑是含有五元杂原子和苯环的杂环化合物。它们构成了众多生物活性化合物和天然产物的关键结构单元。由于含有苯并咪唑/苯并噻唑核的化合物及其衍生物具有令人感兴趣的生物活性,因此正在不断努力开发改进的合成方法来合成这些具有生物学重要性的化合物。受其生物学特性的启发,已尝试在水中使用 N^O 螯合钌 (II) 催化剂合成 2-芳基苯并咪唑和 2-芳基苯并噻唑。通过邻苯二胺或邻氨基苯硫酚与芳香醛在 5 mol% 钌 (II) 催化剂存在下在氮气下反应制备了一系列 2-芳基苯并咪唑和 2-芳基苯并噻唑,包括一些新的衍生物。在水中使用添加剂。该反应扩展到各种杂芳族醛,得到所需的 2-芳基苯并咪唑/2-芳基苯并噻唑的产率高达 88%。在少数情况下,根据所使用的醛,会形成少量二芳基化合物。此外,已使用标准圆盘扩散法筛选合成化合物的抗生素特性。该反应扩展到各种杂芳族醛,得到所需的 2-芳基苯并咪唑/2-芳基苯并噻唑的产率高达
Metal-free selective synthesis of 2-substituted benzimidazoles catalyzed by Brönsted acidic ionic liquid: Convenient access to one-pot synthesis of N-alkylated 1,2-disubstituted benzimidazoles
A novel efficient method for the selective synthesis of 2-substituted benzimidazoles is described through condensation reaction of o-phenylenediamines with a wide rang of aliphatic, aromatic and heteroaromatic aldehyde substrates using Brönsted acidic ionic liquid as a reusable catalyst under metal-free conditions at ambient temperature. Notably, Dodecylimidazolium hydrogen sulfate ([DodecIm][HSO4])
Sulfonic-acid-functionalized activated carbon made from tea leaves as green catalyst for synthesis of 2-substituted benzimidazole and benzothiazole
作者:Mridusmita Goswami、Mintu Maan Dutta、Prodeep Phukan
DOI:10.1007/s11164-017-3187-x
日期:2018.3
Abstract A simple and efficient procedure for synthesis of 2-substituted benzimidazole and benzothiazole has been developed by using sulfonic-acid-functionalized activated carbon as heterogeneous catalyst. The activated material was prepared from matured tea leaf in presence of phosphoric acid as activating agent. The final catalyst was prepared by anchoring –SO3H group on the surface of the activated