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
Room Temperature Anhydrous Suzuki–Miyaura Polymerization Enabled by C−S Bond Activation
cross-coupling reaction between (hetero)aryl boronic esters and arylsulfides was explored, of which universality was exemplified with thirty small molecules and twelve alternating conjugated polymers. Mechanism studies revealed the importance of room temperature and anhydrous condition in reducing the homocoupling defects and enhancing the optoelectronic properties of the conjugated polymers.
A Simple and Efficient Synthesis of (Hetero)Aryl-Substituted Benzothiazolyl or Benzoxazolyl Furan, Thiophene and N-methylpyrrole Derivatives through a Palladium-Catalyzed Regioselective C–H Bond Arylation
作者:Hamed Ben Ammar、Henri Doucet、Fatma Abdellaoui、Chiraz Youssef、Jean-François Soulé
DOI:10.1055/s-0034-1379021
日期:——
The synthesis of 2-(hetero)aryl-5-benzothiazol-2-yl or -benzoxazol-2-ylfuran, -thiophene, and -1-methylpyrrole derivatives was accomplished in two steps. 2-(Benzothiazol-2-yl)- or 2-benzoxazol-2-ylfuran, -thiophene, or -1-methylpyrrole were synthesized by coupling a heteroaryl aldehyde and either 2-mercaptophenol or 2-aminophenol. Then, they were successfully arylated with a wide range of aryl bromides using a phosphine-free palladium protocol; regioselective arylation at C5 of furan, thiophene, or 1-methyl-1H-pyrrole was observed in all cases. This reaction tolerates a wide variety of substituents on the aryl bromides as well as heteroaryl bromides.
FISER-JAKIC L.; KARAMAN B.; JAKOPCIC K., CROAT. CHEM. ACTA, 1980, 53, NO 1, 69-79
作者:FISER-JAKIC L.、 KARAMAN B.、 JAKOPCIC K.
DOI:——
日期:——
FISER-JAKIC, L.;JAKOPCIC, K., CROAT. CHEM. ACTA, 1981, 54, N 2, 245-248