Pd-catalyzed intramolecular addition of active methylene compounds to alkynes with subsequent cross-coupling with (hetero)aryl halides
作者:Aleksandra Błocka、Paweł Woźnicki、Marek Stankevič、Wojciech Chaładaj
DOI:10.1039/c9ra08002c
日期:——
Pd-catalyzed intramolecular addition of active methylene compounds to alkynes, followed by subsequent cross-coupling with (hetero)aryl bromides and chlorides. The reaction proceeds under mild conditions, providing excellent functional group tolerance, including unprotected OH, NH2 groups, enolizable ketones, or a variety of heterocycles. Mechanistic studies point towards a catalytic cycle involving oxidative
我们报告了一种有效的方案,用于串联 Pd 催化的活性亚甲基化合物与炔烃的分子内加成,然后与(杂)芳基溴化物和氯化物进行交叉偶联。该反应在温和条件下进行,提供优异的官能团耐受性,包括未保护的 OH、NH 2基团、可烯醇化的酮或各种杂环。机理研究表明催化循环涉及氧化加成、对 Pd( II ) 活化的炔烃的分子内亲核加成和还原消除,其中 5 -exo-dig环化是限速步骤。