Solvent-Free Palladium-Catalyzed Direct Arylation of Heteroaromatics with Aryl Bromides
作者:Souhila Bensaid、Henri Doucet
DOI:10.1002/cssc.201100771
日期:2012.8
course of catalyzed direct arylations. Some palladium‐catalyzed direct arylations of heteroaromatics can be advantageously performed without any solvent. In the presence of palladium catalysts (1 mol %) and potassium acetate as the base, the direct 5‐arylation of some thiazoles, thiophenes, furans, or pyrroles with aryl bromides as coupling partners proceeds highly regioselectively and in moderate to
在催化的直接芳基化过程中,溶剂是浪费的主要来源之一。一些钯催化的杂芳族化合物的直接芳基化反应可方便地在没有任何溶剂的情况下进行。在钯催化剂(1 mol%)和乙酸钾为碱的情况下,一些噻唑,噻吩,呋喃或吡咯与芳基溴化物作为偶合伙伴直接进行5芳基化,具有高度的区域选择性和中等至高收率。但是,这些无溶剂条件的使用仅限于缺电子的芳基溴化物。