Ligand-free Pd(OAc)2 was found to catalyze very efficiently the direct arylation of thiazole derivatives under very low catalyst concentration. By using activated aryl bromides, the reaction can be performed employing as little as 0.1−0.001 mol % catalyst. With such substrates, this procedure is economically and environmentally attractive. On the other hand, in the presence of more challenging substrates
发现无
配体的Pd(OAc)2在非常低的催化剂浓度下非常有效地催化
噻唑衍
生物的直接芳基化。通过使用活化的芳基
溴化物,可以使用低至0.1-0.001 mol%的催化剂进行反应。对于这样的基板,该程序在经济和环境上都是有吸引力的。另一方面,在更具挑战性的底物(例如某些高度失活或高度拥挤的芳基
溴化物)的存在下,获得的结果令人失望。