Silica-Immobilized NHC–CuI Complex: An Efficient and Reusable Catalyst for A3-Coupling (Aldehyde–Alkyne–Amine) under Solventless Reaction Conditions
作者:Min Wang、Pinhua Li、Lei Wang
DOI:10.1002/ejoc.200800006
日期:2008.5
A novel silica-immobilized NHC–CuI complex was developed and used as a highly efficient catalyst in the three-component coupling reactions of aldehydes, alkynes and amines (A3-coupling). The reactions were applicable to aromatic and aliphatic aldehydes, alkynes and amines, and generated the corresponding propargylamines in good yields only in the presence of SiO2–NHC–CuI (2 mol-%) at room temp. under
开发了一种新型二氧化硅固定的 NHC-CuI 复合物,并将其用作醛、炔和胺的三组分偶联反应(A3 偶联)中的高效催化剂。该反应适用于芳香族和脂肪族醛、炔烃和胺,并且仅在室温下 SiO2–NHC–CuI (2 mol-%) 存在下才能以良好的收率生成相应的炔丙胺。在无溶剂反应条件下。此外,催化剂通过简单的过滤从反应混合物中定量回收,并以几乎一致的活性重复使用十个循环。 (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)