Synthesis and SAR investigations of novel 2-arylbenzimidazole derivatives as melanin-concentrating hormone receptor 1 (MCH-R1) antagonists
摘要:
Compounds containing 2-arybenzimidazole ring systems linked to arylpiperidines were synthesized and evaluated as MCH-R1 antagonists. The results of structure-activity relationship studies led to the identification of compound 4c as a potent MCH-R1 antagonist (IC50 = 1 nM). This compound also has good metabolic stability, and favorable pharmacokinetic and brain penetration properties. However 4c was found to be potent inhibitor of the hERG potassium channel. (C) 2011 Elsevier Ltd. All rights reserved.
Aerobic Oxidation of Primary Amines to Imines in Water using a Cobalt Complex as Recyclable Catalyst under Mild Conditions
作者:Susanta Hazra、Priti Pilania、Mayukh Deb、Ajay Kishor Kushawaha、Anil J. Elias
DOI:10.1002/chem.201803251
日期:2018.10.22
Oxidative coupling of primary amines to imines has been achieved by using a water soluble cobalt complex as catalyst and air as the oxidant at near ambient conditions. Aromatic, heteroaromatic and aliphatic amines were successfully converted to the corresponding imines with yields of up to 96 %. A 20 gram scale reaction for the synthesis of imine from benzylamine in good yield is also demonstrated
伯胺与亚胺的氧化偶联已通过在近乎环境条件下使用水溶性钴配合物作为催化剂并使用空气作为氧化剂来实现。芳香族,杂芳香族和脂肪族胺已成功转化为相应的亚胺,产率高达96%。用该方法还证明了20克规模的反应,用于从苄胺以高收率合成亚胺。已经发现该催化剂可重复使用多达五个循环。它高效,周转率(TON)高达128,并显示化学选择性,唯一的副产物是水和氨。对照实验和机理研究表明,Co II / Co III催化循环负责这些氧化转化。该反应的一些反应性中间体也已经被分离和结构表征。
Azaruthena(II)‐bicyclo[3.2.0]heptadiene: Key Intermediate for Ruthenaelectro(II/III/I)‐catalyzed Alkyne Annulations
作者:Long Yang、Ralf Steinbock、Alexej Scheremetjew、Rositha Kuniyil、Lars H. Finger、Antonis M. Messinis、Lutz Ackermann
DOI:10.1002/anie.202000762
日期:2020.6.26
enabling the preparation of various bridgehead N‐fused [5,6]‐bicyclic heteroarenes through regioselective electrochemical C−H/N−H annulation without chemical metal oxidants. Novel azaruthenabicyclo[3.2.0]heptadienes were fully characterized and identified as key intermediates. Mechanistic studies are suggestive of an oxidatively induced reductive elimination pathway within a ruthenium(II/III) regime
Catalyst-free one-pot synthesis of benzimidazoles from 1,2-diaminoarenes and alcohols
作者:Mahender Reddy Marri、Swamy Peraka、Arun Kumar Macharla、Naresh Mameda、Srujana Kodumuri、Narender Nama
DOI:10.1016/j.tetlet.2014.09.081
日期:2014.11
A new and efficient protocol is described for the one-potsynthesis of benzimidazolesfrom a variety of aryl alcohols and 1,2-diaminoarenes. The yields were ranging from moderate to excellent. Moreover, the present method is utilizing alcohols instead of aldehydes and the reactions are carried out under solvent- and catalyst-free conditions, offering an environmentally benign process.
A one-step synthesis of substituted benzo- and pyridine-fused 1H-imidazoles
作者:Sonu Kumar、Manash P. Sarmah、Yella Reddy、Ashish Bhatt、Ravi Kant
DOI:10.1080/00397911.2021.2001658
日期:2022.1.2
Abstract Substituted benzimidazoles and pyrimidazoles are an important group of heterocyclic aromatic organic compounds in the field of medicinal chemistry. A one-step microwave accelerated synthesis of substituted benzo- and pyridine-fused 1H-imidazoles has been described. Mechanistically, the reaction proceeds by reacting substituted 2-fluoronitrobenzene and substituted arylamine through the formation