Tandem Pd-Catalyzed Cyclization/Coupling of Non-Terminal Acetylenic Activated Methylenes with (Hetero)Aryl Bromides
作者:Aleksandra Błocka、Wojciech Chaładaj
DOI:10.3390/molecules27030630
日期:——
methylene compounds to internal alkynes followed by coupling with aryl and heteroaryl bromides. Highly substituted vinylidenecyclopentanes were obtained with good yields, complete selectivity, and excellent functional group tolerance. A plausible mechanism, supported by DFT calculations, involves the oxidative addition of bromoarene to Pd(0), followed by cyclization and reductive elimination. The excellent
我们报告了一种新方法,用于串联钯催化活性亚甲基化合物与内部炔烃的分子内加成,然后与芳基和杂芳基溴化物偶联。以良好的产率、完全的选择性和优异的官能团耐受性获得了高度取代的亚乙烯基环戊烷。由 DFT 计算支持的一种合理的机制涉及溴芳烃与 Pd(0) 的氧化加成,然后进行环化和还原消除。优异的区域选择性和立体选择性源自底物的烯醇形式与由 π-酸性 Pd(II) 中心激活的炔烃的 5-exo-dig 分子内加成,假定为速率决定步骤。