Ni- or Cu-Catalyzed Cross-Coupling Reaction of Alkyl Fluorides with Grignard Reagents
作者:Jun Terao、Aki Ikumi、Hitoshi Kuniyasu、Nobuaki Kambe
DOI:10.1021/ja034201p
日期:2003.5.1
alkyl Grignard reagents in both Ni- and Cu-catalyzed reactions. Alkyl fluorides efficiently reacted with tertiary alkyl and phenyl Grignard reagents using CuCl2 in the absence of 1,3-butadiene to afford the coupling products in high yields. The competitive reaction of a mixture of alkyl halides (R-X; X = F, Cl, Br) with nC5H11MgBr showed that the reactivities of the halides increase in the order R-Cl
正辛基氟与正丙基溴化镁在 1,3-丁二烯存在下使用 NiCl2 作为催化剂在室温下发生交叉偶联反应,得到中等产率的十一烷。当使用 CuCl2 代替 NiCl2 时,这种烷基-烷基交叉偶联进行得更有效。添加 1,3- 丁二烯显着提高了 Ni 和 Cu 催化反应中伯烷基格氏试剂偶联产物的产率。在不存在 1,3-丁二烯的情况下,烷基氟与叔烷基和苯基格氏试剂使用 CuCl2 有效反应,以高产率提供偶联产物。卤代烷混合物(RX;X = F、Cl、Br)与 nC5H11MgBr 的竞争反应表明,卤化物的反应性按 R-Cl < RF < R-Br 的顺序增加。相比之下,