Metal-free oxidative decarbonylative coupling of aromatic aldehydes with arenes: direct access to biaryls
作者:Ren-Jin Tang、Qing He、Luo Yang
DOI:10.1039/c4cc10155c
日期:——
A metal-free oxidative decarbonylative coupling of aromatic aldehydes with electron-rich or electron-deficient arenes to produce biaryl compounds was developed. This novel coupling was proposed to proceed via a non-chain radical homolytic aromatic substitution (HAS) type mechanism, based on the substrate scope, ortho-regioselectivity, radical trapping experiments and DFT calculation studies. With the
A method for practical preparation of pinacolborane from borane-diethylaniline and pinacol was newly developed. Aromatic C–H borylation of arenes with pinacolborane or bis(pinacolato)diboron catalyzed by 1/2[Ir(OMe)(COD)]2-(4,4′-di-tert-butyl-2,2′-bipyridine) at 25 °C in hexane to give arylboronic esters was directly followed by cross-coupling with aromatic bromides at 60 °C in the presence of PdCl2(dppf)
新开发了一种由硼烷-二乙基苯胺和频哪醇实际制备频哪醇硼烷的方法。1/2 [Ir(OMe)(COD)] 2-(4,4'-二叔丁基-2,2'-联吡啶)催化的芳烃与频哪醇硼烷或双(频哪醇)二硼烷的芳烃C氢硼化在25℃下于己烷中在20℃下得到芳基硼酸酯,然后直接在60℃在PdCl 2(dppf)(3.0mol%)和K 3 PO 4在DMF中的存在下与芳族溴化物交叉偶联。这种一锅两步的方法以高收率提供了多种不对称的联芳基。