不含过渡金属的C–N和C–C的形成:由炔酮合成苯并[4,5]咪唑并[1,2- a ]吡啶和2-吡啶酮
摘要:
在此,已经揭示了在温和条件下炔烃与2-甲基苯并咪唑的无过渡金属的有效级联反应。该级联反应涉及迈克尔加成/分子内环加成/脱水,并以中等至良好的产率提供了所需的苯并[4,5]咪唑并[1,2- a ]吡啶。此外,三种苯并[4,5]咪唑并[1,2- a ]吡啶(3d,3i和3q)对Hep-G2(人类肝癌),T-24(人类膀胱癌细胞)和SK-OV-3(人类卵巢癌)细胞系,IC 50值在8.05–10.67μmolL -1范围内。为了研究有效抑制细胞生长的机制,对细胞周期分析,凋亡率检测,Ca 2+生成的测量,ROS,线粒体膜电位测定和caspase-3 / 9活化进行了进一步的研究。化合物3i。
Rhodium catalyzed 2‐alkyl‐benzimidazoles synthesis from benzene‐1,2‐diamines and tertiary alkylamines as alkylating agents
作者:Yamini、Saurabh Sharma、Pralay Das
DOI:10.1002/aoc.6278
日期:2021.8
synthesized from benzene-1,2-diamine and tertiary amines as alkylating agent under polystyrene supported rhodium (Rh@PS) nanoparticles (NPs) catalyzed conditions. The heterogeneous rhodium catalyst was applied first time for the synthesis of 2-alkyl-benzimidazoles. The reaction followed through oxidation of alkylamines, transamination, and oxidativecyclisation with benzene-1,2-diamines for the corresponding
Indium-mediated one-pot benzimidazole synthesis from 2-nitroanilines or 1,2-dinitroarenes with orthoesters
作者:Jaeho Kim、Jihye Kim、Hyunseung Lee、Byung Min Lee、Byeong Hyo Kim
DOI:10.1016/j.tet.2011.08.017
日期:2011.10
One-pot reduction-triggered heterocyclizations from 2-nitroanilines or 1,2-dinitroarenes to benzimidazoles were investigated in this study. In the presence of indium/AcOH in ethyl acetate at reflux, reaction of 2-nitroanilines or 1,2-dinitroarenes with R–C(OMe)3 (R=Me, Ph) produced excellent yields of the corresponding benzimidazoles within 30 min to 6 h depending on the substituents of the starting
Microwave-Assisted Synthesis of Polysubstituted Benzimidazoles by Heterogeneous Pd-Catalyzed Oxidative C-H Activation of Tertiary Amines
作者:Lidia De Luca、Andrea Porcheddu
DOI:10.1002/ejoc.201101001
日期:2011.10
Tertiaryamines can be used in place of aldehydes and carboxylic derivatives as partners in the synthesis of benzimidazoles. Dehydrogenative amine activation under heterogeneous catalysis was developed for the direct transformation of tertiaryamines into benzimidazoles. Good yields and efficient recovery and recycling of the catalyst are some of the advantages of this new methodology, which shows
Rapid one-pot preparation of 2-substituted benzimidazoles from 2-nitroanilines using microwave conditions
作者:David S. VanVliet、Paul Gillespie、Jan J. Scicinski
DOI:10.1016/j.tetlet.2005.07.130
日期:2005.9
A high yielding one-pot procedure for the generation of 2-substituted benzimidazoles directly from 2-nitroanilines by in situ reduction and cyclization using a microwave procedure is described.
Supported Rhodium (Rh@PS) Catalyzed Benzimidazoles Synthesis Using Ethanol/Methanol as C
<sub>2</sub>
H
<sub>3</sub>
/CH Source
作者:Saurabh Sharma、Ajay Sharma、Yamini、Pralay Das
DOI:10.1002/adsc.201801040
日期:2019.1.11
stable polystyrene supported rhodium (Rh@PS) nano‐catalyst has been synthesized by following reduction‐deposition approach and applied for the selective benzimidazoles synthesis from 1,2‐phenylenediamines and ethanol/methanol as C2H3/CH source. The ethanol/methanol in the presence of trace amounts of aerobic oxygen under Rh@PS catalysed condition, first participated in oxidation of alcohol followed by consecutive