Substituent-controlled selective synthesis of 1,2-diketones and internal alkynes from terminal alkynes and arylboronic acids <i>via</i> α-stilbene radicals obtained from heteroleptic Cu(<scp>i</scp>) complexes under visible light
Herein, we report a substituent-controlled synthesis of 1,2-diketones and internal alkynesfrom terminal alkynes and arylboronic acids via α-stilbene radicals obtained from heteroleptic Cu(I) complexes under visible-light irradiation. The in situ generated α-stilbene radical Cu(II)-complex was achieved by photoinduced Csp–Csp2 coupling of copper(I) acetylides and aryl radicals catalysed by heteroleptic
在此,我们报告了在可见光照射下,通过从杂配 Cu( I ) 配合物获得的α-二苯乙烯自由基,从末端炔烃和芳基硼酸合成 1,2-二酮和内炔烃。原位生成的α-二苯乙烯自由基Cu( II )-配合物是通过铜( I )乙炔化物和芳基自由基在杂配Cu( I )配合物催化下的光诱导C sp -C sp 2偶联实现的。这种光化学方法提供了高原子经济性和低E温和反应条件下的因子和官能团耐受性。机理见解清楚地表明,该反应是通过铜(I)乙炔化物和苯基自由基中间途径进行的。
Wacker-Type Oxidation of Alkynes into 1,2-Diketones Using Molecular Oxygen
An intriguing new Wacker-type oxidation of alkynes catalyzed by PdBr2 and CuBr2 is described, which opens an efficient access to 1,2-diketones usingmolecularoxygen. Under the optimized conditions, a variety of alkynes, including diarylalkynes, arylalkylalkynes, and dialkylalkynes, were compatible substrates in this transformation. The mechanism of this reaction was preliminarily investigated by control