Mild Mn(OAc)<sub>3</sub>-Mediated Aerobic Oxidative Decarboxylative Coupling of Arylboronic Acids and Arylpropiolic Acids: Direct Access to Diaryl 1,2-Diketones
作者:Wen-Xin Lv、Yao-Fu Zeng、Shang-Shi Zhang、Qingjiang Li、Honggen Wang
DOI:10.1021/acs.orglett.5b01265
日期:2015.6.19
A simple and efficient method for the synthesis of diaryl 1,2-diketones has been developed. The reaction represents the first example of diaryl 1,2-diketones that are synthesized directly from arylboronic acids and arylpropiolicacids by a radical pathway in moderate to good yields. This reaction proceeds under mild reaction conditions and with good tolerance of a variety of functional groups. Preliminary
The ruthenium-catalyzedsynthesis of 1,2-diketones through the oxidation of alkynes by using sodium hypochlorite has been investigated. RuO4 was generated in situ from inexpensive RuCl3·xH2O, and NaOCl as the oxidant demonstrated high performance at room temperature in the solvent diethyl carbonate. A variety of diketones were prepared in good yields by using this environmentally friendly procedure
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。