Palladium‐Catalyzed Chemoselective Amination of Chloro(hetero)aryl Triflates Enabled by Alkyl‐Pyrazole‐Based Phosphine Ligands
作者:Changxue Gu、On Ying Yuen、Shan Shan Ng、Chau Ming So
DOI:10.1002/adsc.202301255
日期:2024.4.9
palladium-catalyzed chemoselective amination of chloro(hetero)aryl triflates in the C−Cl bond for the first time. A newly designed and synthesized alkyl-pyrazole-based phosphine ligand, L26 (BirdPhos), which is featured with the pyrazole ligand core and the cyclohexyl group at the C3 and C5 positions, was key to the success of this reaction. A variety of chloro(hetero)aryl triflates coupled with aromatic, aliphatic
这项研究首次描述了钯催化的氯(杂)芳基三氟甲磺酸酯在 C−Cl 键上的化学选择性胺化。新设计和合成的烷基吡唑基膦配体L26(BirdPhos),其特点是吡唑配体核心和C3和C5位置的环己基,是成功的关键这个反应。各种氯(杂)芳基三氟甲磺酸酯与芳香族、脂肪族和杂环胺顺利偶联,生成了产率高达 97% 的相应产物,并且 C−Cl 键具有一般化学选择性(> 99%)。药物类似物也通过化学选择性分子间胺化合成。本研究试图通过实验和密度泛函理论(DFT)计算来研究这类新型配体的构效关系。