Synthesis, Catalytic Activity and Comparative Leaching Studies of Calix[8]arene‐Supported Pd‐NHC Complexes for Suzuki‐Miyaura Cross‐Couplings
作者:Sandra Abi Fayssal、Timothée Naret、Julien Buendia、Axel Labattut、Vincent Huc、Cyril Martini、Emmanuelle Schulz
DOI:10.1002/adsc.202101204
日期:2022.3
superior to that of more conventional homogeneous catalysts. Of main importance, a simple filtration of the insoluble supported catalysts after reaction afforded the lowest Pd contamination values in the target products, in some cases directly approaching the levels authorised by the industrial regulations. Offering furthermore the possibility of easy palladium recovery in the current context of its overconsumption
报道了在苄氧基杯[8]芳烃大环上快速且可扩展地合成受支持的 NHC-Pd(II)-吡啶配合物。它们随后用于 Suzuki-Miyaura 基准反应,优化了金属中心周围配体的性质,提供了两种非常活跃的预催化剂。当在 EtOH 中用作绿色反应溶剂时,它们都可以促进具有挑战性的 API 前体在低催化负载下的交叉偶联。此外,它们的活性已被证明与更传统的均相催化剂相当甚至更好。最重要的是,在反应后对不溶性负载型催化剂进行简单过滤,可在目标产品中提供最低的 Pd 污染值,在某些情况下直接接近工业法规授权的水平。