NHC–BIAN–Cu(I)-Catalyzed Friedländer-Type Annulation of 2-Amino-3-(per)fluoroacetylpyridines with Alkynes on Water
作者:Magdalena Dolna、Michał Nowacki、Oksana Danylyuk、Artur Brotons-Rufes、Albert Poater、Michał Michalak
DOI:10.1021/acs.joc.2c00380
日期:2022.5.6
The direct catalytic alkynylation/dehydrative cyclization of 2-amino-3-trifluoroacetyl-pyridines on water was developed for the efficient synthesis of a broad range of fluorinated 1,8-naphthyridines from terminal alkynes. A novel N-heterocyclic carbene (NHC) ligand system that combines a π-extended acenaphthylene backbone with sterically bulky pentiptycene pendant groups was successfully utilized in
开发了 2-氨基-3-三氟乙酰基吡啶在水中的直接催化炔基化/脱水环化,用于从末端炔烃高效合成广泛的氟化 1,8-萘啶。一种新的 N-杂环卡宾 (NHC) 配体系统将 π 延伸的苊主链与空间庞大的戊二烯侧基相结合,成功地用于铜或银介导的环化。反应路径的计算分析支持我们对一组铜和银催化剂的不同实验转化率和产率的解释。还讨论了金属中心的空间位阻和NHC咪唑环上取代基的柔韧性对催化性能的影响。