作者:Hamed Ammar、Henri Doucet、Anissa Beladhria、Kassem Beydoun、Ridha Salem
DOI:10.1055/s-0030-1260076
日期:2011.8
the base and DMAc as the solvent, promotes the 5-arylation in moderate to high selectivities and yields. A wide variety of aryl and heteroaryl bromide derivatives have been successfully employed. Their electronic and steric properties also have an influence on the regioselectivities and yields of the coupling products. Both electron-poor and electron-rich aryl bromides gave satisfactory results, although
发现1-甲基吡唑是通过使用芳基溴化物的CH活化/官能化来钯催化的直接芳基化的合适伴侣。发现反应条件和催化剂的性质对选择性具有决定性的影响。使用过量的吡唑(4当量),仅使用0.5-1 mol%的乙酸钯(II)作为催化剂,使用乙酸钾作为碱,并使用DMAc作为溶剂,可在中等至高选择性下促进5-芳基化,产量。已经成功地使用了各种各样的芳基和杂芳基溴化物衍生物。它们的电子和空间特性也影响偶联产物的区域选择性和产率。贫电子和富电子芳基溴化物均获得令人满意的结果,尽管, 芳基化-偶联-钯-吡唑-区域选择性