Carbofunctionalization of Terminal Alkynes via Rhodium Catalysis Enabling Formations of Four Different Bonds
作者:Dae-Kwon Kim、Minjung Keum、Heekyung Yun、Insu Kim、Jung Min Joo、Chulbom Lee
DOI:10.1021/acs.orglett.3c00341
日期:2023.3.31
disubstituted rhodium vinylidene complex is generated upon C–C bond formation at the terminal alkyne with tethered electrophiles such as alkyl halides, aldehydes, imines, and Michael acceptors. Subsequent intermolecular transfer oxygenation of the rhodium vinylidene with pyridine N-oxide generates a rhodium-complexed ketene intermediate that reacts with a variety of heteroatom nucleophiles to give rise to cyclic
这里描述的是由铑联合催化介导的末端炔烃的氧合碳官能化,能够区域选择性地形成 C-C、C-H、C-O 和 C-杂原子键。机理研究表明,双取代的铑亚乙烯基络合物是在末端炔烃与拴系的亲电子试剂(例如烷基卤化物、醛、亚胺和迈克尔受体)形成 C-C 键时生成的。随后,铑亚乙烯基与吡啶N-氧化物发生分子间转移氧化,生成铑络合乙烯酮中间体,该中间体与各种杂原子亲核试剂反应,生成环状羧酸衍生物。