Functionalized magnesiated aniline derivatives were readily prepared by using a bromine- or iodine-magnesium exchange. Formamidine or benzimine were found to be excellent protecting groups of the amino function for the generation of functionalized aminated Grignard reagents. These organomagnesium reagents react with various electrophiles such as aldehydes, iodoenones and allylic halides in excellent yields. After transmetallation with ZnBr2, Pd(0)-catalyzed cross-coupling with aryl iodides can be readily performed.
                                    通过
溴或
碘-
镁交换,很容易制备出功能化
镁化
苯胺衍
生物。研究发现,
甲脒或苯并咪胺是生成官能化
氨基
格氏试剂的极佳
氨基保护基团。这些
有机镁试剂能与各种亲电体(如醛、
碘烯酮和烯丙基卤化物)发生反应,产率极高。在与 ZnBr2 发生反
金属化反应后,可以很容易地在 Pd(0)催化下与芳基
碘化物发生交叉偶联反应。