Reactions of 2-carbonyl- and 2-hydroxy(or methoxy)alkyl-substituted benzimidazoles with arenes in the superacid CF<sub>3</sub>SO<sub>3</sub>H. NMR and DFT studies of dicationic electrophilic species
作者:Dmitry S Ryabukhin、Alexey N Turdakov、Natalia S Soldatova、Mikhail O Kompanets、Alexander Yu Ivanov、Irina A Boyarskaya、Aleksander V Vasilyev
DOI:10.3762/bjoc.15.191
日期:——
Reactions of 2-carbonyl- and 2-hydroxy(or methoxy)alkylbenzimidazoles with arenes in the Brønsted superacid TfOH resulted in the formation of the corresponding Friedel–Crafts reaction products, 2-diarylmethyl and 2-arylmethyl-substituted benzimidazoles, in yields up to 90%. The reaction intermediates, protonated species derived from starting benzimidazoles in TfOH, were thoroughly studied by means
Assembly of Substituted 1<i>H</i>-Benzimidazoles and 1,3-Dihydrobenzimidazol-2-ones via CuI/<scp>l</scp>-Proline Catalyzed Coupling of Aqueous Ammonia with 2-Iodoacetanilides and 2-Iodophenylcarbamates
作者:Xiaoqiong Diao、Yuji Wang、Yongwen Jiang、Dawei Ma
DOI:10.1021/jo9017183
日期:2009.10.16
CuI/l-proline catalyzed coupling of aqueous ammonia with 2-iodoacetanilides and 2-iodophenylcarbamates affords the arylamination products at roomtemperature, which undergo in situ additive cyclization under acidic conditions or heating to give substituted 1H-benzimidazoles and 1,3-dihydrobenzimidazol-2-ones, respectively. A wide range of functional groups including ketone, nitro, iodo, bromo, and
CuI / l-脯氨酸催化氨水与2-碘乙酰苯胺和2-碘苯基氨基甲酸酯的偶联在室温下提供芳基胺化产物,将其在酸性条件下进行原位加成环化或加热以生成取代的1 H-苯并咪唑和1,3-二氢苯并咪唑-2-酮。在这些反应条件下,可以耐受包括酮,硝基,碘,溴和酯在内的各种官能团,从而为这些杂环提供了极大的多样性。
Exploration of 2-benzylbenzimidazole scaffold as novel inhibitor of NF-κB
previously reported. Although most of the benzimidazole derivatives showed strong inhibitory activity in low micromolar potency, 2-(4-methoxybenzyl)-1H-benzo[d]imidazole (3m; IC50 = 1.7 μM) and 2-(2-methoxybenzyl)-1H-benzo[d]imidazole (3n; IC50 = 2.4 μM) showed the best inhibition. The structure activity relationship revealed that 2-benzylbenzimidazole scaffold with hydrogen bonding acceptor on phenyl
为了找到新的核因子κB活性抑制剂,合理设计,合成和系统研究了一系列苯并咪唑衍生物对RAW 264.7细胞中LPS诱导的NF-κB抑制的体外活性,基于基于柔性查尔酮JSH的SEAP分析(先前报道的((E)-1-(2-羟基-6-(异戊氧基)苯基)-3-(4-羟基苯基)丙-2-烯-1-酮)。尽管大多数苯并咪唑衍生物在低微摩尔浓度下均显示出强大的抑制活性,但是2-(4-甲氧基苄基)-1 H-苯并[ d ]咪唑(3m; IC 50 = 1.7μM)和2-(2-甲氧基苄基)-1 H-苯并[ d ]咪唑(3n ; IC50 = 2.4μM)表现出最好的抑制作用。结构活性关系表明,在苯环上带有氢键受体的2-苄基苯并咪唑支架以药效团的形式出现。
Decarboxylative Coupling of<i>α</i>-Keto Acids with<i>ortho</i>-Phenylenediamines Promoted by an Electrochemical Method in Aqueous Media
作者:Hai-Bin Wang、Jing-Mei Huang
DOI:10.1002/adsc.201501167
日期:2016.6.16
An electrochemical method for the decarboxylative coupling of α‐keto acids with ortho‐phenylenediamines was developed. The reaction proceeded smoothly in aqueous solution under air and metal catalyst‐free conditions to afford 2‐substituted benzimidazoles in good yields. Benzothiazoles could also be synthesized by this protocol.