Synthesis of Biaryls via a Nickel(0)-Catalyzed Cross-Coupling Reaction of Chloroarenes with Arylboronic Acids
作者:Syun Saito、Saori Oh-tani、Norio Miyaura
DOI:10.1021/jo9707848
日期:1997.11.1
The cross-coupling reaction of arylboronic acid with chloroarenes to give biaryls was carried out in high yields at 70-80 degrees C in the presence of a nickel(0) catalyst and K(3)PO(4) (3 equiv) in dioxane or benzene. The nickel(0) catalyst in situ prepared from NiCl(2).L (L = dppf, 2PPh(3)) (3-10 mol %) and 4 equiv of BuLi at room temperature was recognized to be most effective. The reaction can
芳基硼酸与氯代芳烃的交叉偶联反应生成联芳基是在二恶烷中存在镍(0)催化剂和K(3)PO(4)(3当量)的情况下在70-80摄氏度下高收率进行的或苯。由NiCl(2).L(L = dppf,2PPh(3))(3-10 mol%)和4当量的BuLi在室温下原位制备的镍(0)催化剂被认为是最有效的。该反应可适用于具有吸电子或给电子基团的多种氯代芳烃,例如4-NC,4-CHO,2-或4-CO(2)Me,4-COMe,4-NHAc ,4-Me,4-OMe,4-NH(2)和4-NMe(2)。氯代芳烃的取代作用的哈米特图表明,该反应涉及速率确定氯代芳烃向镍(0)络合物的氧化加成反应。