Iridium-catalyzed C–H coupling reaction of heteroaromatic compounds with bis(pinacolato)diboron: regioselective synthesis of heteroarylboronates
作者:Jun Takagi、Kazuaki Sato、John F Hartwig、Tatsuo Ishiyama、Norio Miyaura
DOI:10.1016/s0040-4039(02)01135-8
日期:2002.8
The C–H coupling of aromatic heterocycles with bis(pinacolato)diboron was carried out in octane at 80–100°C in the presence of a 1/2[IrCl(COD)]2-(4,4′-di-tert-butyl-2,2′-bipyridine) catalyst (3 mol%). The reactions of five-membered substrates such as thiophene, furan, pyrrole, and their benzo-fused derivatives exclusively produced 2-borylated products, whereas those of six-membered heterocycles including
芳香族杂环与双(频哪醇)二硼烷的C–H偶联是在80–100°C的辛烷中,在存在1/2 [IrCl(COD)] 2-(4,4'-二酯的条件下进行的-2,2'-联吡啶-丁基)催化剂(3mol%)。五元底物(例如噻吩,呋喃,吡咯及其苯并稠合衍生物)的反应仅生成2硼化产物,而六元杂环(包括吡啶和喹啉)的反应则选择性地在3位发生。还通过使用几乎等摩尔量的底物和二硼来实现双(硼基)杂芳族化合物的区域选择性合成。