Phenyliodine Diacetate-Mediated Intramolecular C(<i>sp</i><sup><i>2</i></sup>)H Amidation for 1,2-Disubstituted Benzimidazole Synthesis under Metal-Free Conditions
作者:Saikat Maiti、Prasenjit Mal
DOI:10.1002/adsc.201401110
日期:2015.5.4
A transition metal‐free, hypervalent iodine(III) reagent [phenyliodine diacetate (PIDA)]‐mediated C(sp2)Hamidation in trifluoroethanol (TFE) has been developed. The intramolecular coupling methodology presented here provides a direct access to 1,2‐disubstituted multifunctional benzimidazoles in good to excellent yields. The reactions were performed in the open air and at ambient temperature, and
One-pot synthesis of 2-arylated and 2-alkylated benzoxazoles and benzimidazoles based on triphenylbismuth dichloride-promoted desulfurization of thioamides
The development of novel and efficient synthesismethods for 2-substituted benzazole derivatives is of interest as they are biologically active substances. Herein, a simple method for the synthesis of 2-aryl- and 2-alkyl-substituted benzazoles is described. The reaction of 2-aminophenols with thioamides at 60 °C in the presence of triphenylbismuth dichloride in 1,2-dichloroethane as a promoter afforded
2-取代苯并唑衍生物是具有生物活性的物质,因此开发新颖且有效的合成方法引起了人们的兴趣。本文描述了合成 2-芳基-和 2-烷基-取代的苯并唑的简单方法。 2-氨基苯酚与硫代酰胺在 60 °C 下,在二氯化三苯基铋的存在下,在 1,2-二氯乙烷中作为促进剂,在温和的反应条件下以中等至优异的收率提供各种 2-芳基-和 2-烷基苯并恶唑。该方法也可用于苯并咪唑和苯并噻唑的合成。本研究首次使用三苯基二氯化铋通过硫代酰胺经脱硫和氯化生产苯甲亚胺酰氯,及其在2-取代苯并唑合成中的应用。
Design, Synthesis, Pharmacological Screening and Molecular Docking Study of New Substituted Benzimidazole Derivatives
作者:C. N. Nalini、A. Prabakaran、R. Jayasree
DOI:10.1007/s11094-023-02850-z
日期:2023.4
present work aimed to study the therapeutic significance of various substituted benzimidazole derivatives in the treatment of peptic ulcers. Aspirin induced gastric ulcer model was used for the study of antiulcer activity using acetyl salicylic acid as ulcer inducing agent and albino rats as the screening model. Pharmacological screening protocol for the antiulcer activity of synthesized compounds was
Iridium(III)-Catalyzed One-Pot Access to 1,2-Disubstituted Benzimidazoles Starting from Imidamides and Sulfonyl Azides
作者:Linhua Xu、Lianhui Wang、Yadong Feng、Yudong Li、Lei Yang、Xiuling Cui
DOI:10.1021/acs.orglett.7b02028
日期:2017.8.18
A novel Ir-catalyzed annulation of imidamides with sulfonyl azides has been developed. 1,2-Disubstituted benzimidazoles could be easily obtained in up to 99% yield for more than 40 examples. The products further streamline the synthesis of molecules that are important building blocks for organic synthesis and drug discovery. This strategy features high regioselectivity, efficieney, good tolerance of functional groups, and Mild reaction conditions.