Palladium-catalysed direct regioselective C5-arylation of a thiophene bearing a cyclopropyl ketone group at C2
作者:Anissa Beladhria、Aditya L. Gottumukkala、Chiraz Youssef、Charles Beromeo Bheeter、Hamed Ben Ammar、Ridha Ben Salem、Henri Doucet
DOI:10.1016/j.catcom.2013.07.014
日期:2013.11
at C2 was successfully employed in palladium-catalysed direct arylation. The reaction proceeds regioselectively at C5 without decomposition of the cyclopropyl ketone substituent. These couplings were performed employing as little as 0.5 mol% of ligand-free Pd(OAc)2 catalyst with electron-deficient aryl bromides. A wide variety of functional groups on the aryl bromide such as nitrile, nitro, acetyl, formyl
在钯催化的直接芳基化反应中成功使用了在C2处带有环丙基酮基的噻吩。该反应在C5区域选择性地进行,而不分解环丙基酮取代基。使用少至0.5 mol%的无配体Pd(OAc)2催化剂与缺电子的芳基溴化物进行这些偶联。芳基溴化物上的各种官能团(例如腈,硝基,乙酰基,甲酰基,苯甲酰基,酯,三氟甲基,氟或甲氧基)是可耐受的。©2013爱思唯尔科学。版权所有。