Synthesis of 3-Nitropyrrolidines via Dipolar Cycloaddition Reactions Using a Modular Flow Reactor
作者:Steven Ley、Marcus Baumann、Ian Baxendale
DOI:10.1055/s-0029-1219344
日期:2010.3
The generation and subsequent use of unstabilised azomethine ylides in dipolar cycloaddition reactions within a flow microreactor is demonstrated. The 3-nitropyrrolidines produced were furthermore subjected to chemoselective hydrogenation reac- tions using the H-Cube ® system. To ensure product purities in ex- cess of 90-95%, immobilised scavengers were successfully employed.
Synthesis of Highly Substituted Nitropyrrolidines, Nitropyrrolizines and Nitropyrroles via Multicomponent-Multistep Sequences within a Flow Reactor
作者:Steven V. Ley、Marcus Baumann、Ian R. Baxendale、Andreas Kirschning、Jens Wegner
DOI:10.3987/com-10-s(e)77
日期:——
3-nitropyrrolidines via a flow chemistry sequence. This new work describes the development of a three-component coupling reaction between glycine esters, aldehydes and nitro alkenes. In order to further demonstrate the utility of flow technology in concert with heterogeneous reagents and scavengers for complex reaction sequences an in-line oxidation resulting in the conversion of tetra-substituted pyrrolidines
我们扩展了最近关于不稳定的偶氮甲碱叶立德与硝基烯烃的偶极环加成反应通过流动化学序列生成 3-硝基吡咯烷的结果。这项新工作描述了甘氨酸酯、醛和硝基烯烃之间的三组分偶联反应的发展。为了进一步证明流动技术与多相试剂和清除剂一起用于复杂反应序列的效用,已经开发了一种在线氧化,从而导致四取代的吡咯烷转化为其吡咯同系物。‡本文献给 Albert Eschenmoser 教授 85 岁生日,并感谢他对化学的许多杰出贡献。引言现代药物发现计划的一个必要要求是灵活快速地访问大量不同的功能化构建块。这些核心结构通常是杂环基序,它们是通过大量稳健的化学转化获得的。此外,杂环框架提供了与生物靶标的易于调节的相互作用,以帮助筛选的最佳结合数据。在这些杂环结构中,吡咯烷环具有特别的药用意义。它不仅存在于许多肽模拟物中,而且还存在于许多 HETEROCYCLES,Vol. 2011年82期2号1297 此外,杂环框架提