Diversity-oriented synthesis of imidazo[2,1-<i>a</i>]isoquinolines
作者:Shaoyu Mai、Yixin Luo、Xianyun Huang、Zhenghao Shu、Bingnan Li、Yu Lan、Qiuling Song
DOI:10.1039/c8cc05390a
日期:——
Herein, we report an efficient and practical strategy for the synthesis of five types of imidazo[2,1-a]isoquinolines via Cp*RhIII-catalyzed [4+2] annulation of 2-arylimidazoles and α-diazoketoesters, whose structural and substituted diversity at 5- or 6-position can be precisely controlled by the α-diazoketoester coupling partners. Compared with previous reports, in this study, we merged two attractive
本文中,我们报告了通过Cp * Rh III催化的2-芳基咪唑和α-重氮酮酸酯的[4 + 2]环合反应合成五种咪唑并[ 2,1- a ]异喹啉的有效而实用的策略。可以通过α-重氮酮酸酯偶合伙伴精确控制5位或6位取代的多样性。与以前的报告相比,在这项研究中,我们通过选择合适的酯基团(–COOEt,–COO tBu或–COOiPr)或廉价的添加剂(HOAc或KOAc)。此外,通过几种生物活性化合物的简明合成和代表性药物的后期修饰,证明了这些方法的合成功效。
QUINOLONES USEFUL AS INDUCIBLE NITRIC OXIDE SYNTHASE INHIBITORS
申请人:Smith Nicholas D.
公开号:US20080139558A1
公开(公告)日:2008-06-12
The present invention relates to novel quinolones of Formula I that inhibit inducible NOS synthase together with methods of synthesizing and using the compounds including methods for inhibiting or modulating nitric oxide synthesis and/or lowering nitric oxide levels in a patient by administering the compounds for the treatment of disease.
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.
Non-metal-mediated <i>N</i>-oxyl radical (TEMPO)-induced acceptorless dehydrogenation of N-heterocycles <i>via</i> electrocatalysis
作者:Huiqing Hou、Xinhua Ma、Yaling Ye、Mei Wu、Sunjie Shi、Wenhe Zheng、Mei Lin、Weiming Sun、Fang Ke
DOI:10.1039/d1ra08919f
日期:——
of N-heterocycles with metal-free catalysts holds the key to difficulties in green and sustainable chemistry. Herein, an N-oxyl radical (TEMPO) acting as an oxidant in combination with electrochemistry is used as a synthesis system under neutral conditions to produce N-heterocycles such as benzimidazole and quinazolinone. The key feature of this protocol is the utilization of the TEMPO system as an
使用无金属催化剂直接催化 N-杂环无受体脱氢的方案的开发是解决绿色和可持续化学难题的关键。本文中, N-氧基自由基(TEMPO)作为氧化剂与电化学相结合,在中性条件下用作合成体系,生产N-杂环化合物,例如苯并咪唑和喹唑啉酮。该协议的主要特点是利用 TEMPO 系统作为一种廉价且易于处理的自由基替代物,可以有效促进脱氢反应。机理研究还表明氧化性TEMPO氧化还原催化循环参与2,3-二氢杂芳烃的脱氢。
Combined Pd/C and Montmorillonite Catalysis for One-Pot Synthesis of Benzimidazoles
作者:Nicholas A. Weires、Jared Boster、Jakob Magolan
DOI:10.1002/ejoc.201201101
日期:2012.10.22
series of nineteen benzimidazoles are prepared from ortho-nitroanilines via one-pot transfer hydrogenation, condensation, and dehydrogenation enabled by the concurrent use of two heterogeneous catalysts: montmorillonite-K10 and Pd/C. This strategy is further employed to accomplish a five-step, three-component synthesis of an antifungal benzimidazoquinazoline using a simple one-pot procedure.