Selective C-C bonds formation, N-alkylation and benzo[d]imidazoles synthesis by a recyclable zinc composite
作者:Guanxin Zhu、Zheng-Chao Duan、Haiyan Zhu、Dongdong Ye、Dawei Wang
DOI:10.1016/j.cclet.2021.06.060
日期:2022.1
reaction, dehydrogenation and heterocycles synthesis, instead of noble metals. The uniformly dispersed zinc composites were designed, synthesized and carefully characterized by means of XPS, EDS, TEM and XRD. The resulting zinc composite showed good catalytic activity for the N-alkylation of amines with amines, ketones with alcohols in water under base-free conditions, while unsaturated carbonyl compounds
synthesizing various aryl and heteroaryl 2-substituted benzimidazoles. The synthesized dendritic organocatalyst was proved to be amazingly reactive and gave high yield of products within a few minutes at room temperature with low catalyst loading. Here, a new stable hemiaminal, the species rarely been detected and much less isolated in bulk, was obtained during the synthesis of benzimidazoles. Moreover, this
Tunable Triazole-Phosphine-Copper Catalysts for the Synthesis of 2-Aryl-1<i>H</i>
-benzo[d]imidazoles from Benzyl Alcohols and Diamines by Acceptorless Dehydrogenation and Borrowing Hydrogen Reactions
作者:Zhaojun Xu、Duo-Sheng Wang、Xiaoli Yu、Yongchun Yang、Dawei Wang
DOI:10.1002/adsc.201700179
日期:2017.10.4
activity. Mechanistic studies and deuterium labeling experiments indicated that the reactions proceeded by an initial and reversible alcohol dehydrogenation resulting in a copper hydride intermediate. This was also supported by the direct observation of a diagnostic copper hydride signal by solid‐state infrared spectroscopy. The TAP−Cu‐H complex showed absorptions at 912 cm−1 that could be assigned
三唑-膦-铜配合物(TAP-Cu)已被合成并用作可调谐和有效的催化剂,用于选择性合成氟代2-芳基-1 H-苯并[d]咪唑和1-苄基-2-芳基1小时一步法制得的简单醇中的苯并[d]咪唑衍生物。TAP-Cu对脱氢和借用氢反应均显示出优异且可调节的催化活性,首次证明了80多个例子。观察到配体在催化剂活性中起关键作用。机理研究和氘标记实验表明,反应是通过初始且可逆的醇脱氢进行的,从而生成氢化铜中间体。固态红外光谱法直接观察氢化铜诊断信号也支持了这一点。TAP-Cu-H络合物在912 cm -1处显示吸收可以分配给氢化铜拉伸。此外,也成功地进行了中间双亚胺的直接捕集。
Bentonite clay: an efficient catalyst for the synthesis of 2-substituted benzimidazoles
作者:Victor A. Cardozo、Rubén Sánchez-Obregón、Héctor Salgado-Zamora、Rogelio Jiménez-Juárez
DOI:10.1007/s00706-015-1423-x
日期:2015.8
the coupling of o-phenylenediamine and carboxylic acids or their derivatives using a strong acid and high temperature, or a two-step sequence that involves oxidative cyclodehydrogenation of Schiff’s bases, obtained by the reaction of o-phenylenediamines and aromatic aldehydes. A simple, efficient, and environmentally friendly procedure for the synthesis of substituted 2- and 2,5(6)-substituted benzimidazoles
Design, Microwave‐Assisted Synthesis and in Vitro Antibacterial and Antifungal Activity of 2,5‐Disubstituted Benzimidazole
作者:Yanpeng Shi、Kai Jiang、Ran Zheng、Jiaxu Fu、Liuqing Yan、Qiang Gu、Yumin Zhang、Feng Lin
DOI:10.1002/cbdv.201800510
日期:2019.3
5‐disubstituted benzimidazole derivatives were designed, synthesized and evaluated for their antibacterial activities. The tested compounds B1–B4 and C2–C6 exhibited not only good antifungalactivity but also favorable broad‐spectrum antibacterial activity. Also, the lowest MIC of antibacterial and antifungalactivity was 2 μg/mL and 4 μg/mL, respectively. It suggested that the structure of compound including the