Preparation of Functionalized Aryl Iron(II) Compounds and a Nickel-Catalyzed Cross-Coupling with Alkyl Halides
作者:Stefan H. Wunderlich、Paul Knochel
DOI:10.1002/anie.200905196
日期:2009.12.14
The ortho‐ferration of functionalizedarenesusing tmp2Fe⋅2MgCl2⋅4LiCl furnishes the corresponding diorgano FeII reagents at 25 °C in high yields. These reagents undergo cross‐coupling reactions in the presence of 4‐fluorostyrene to give various alkylated arenes. It turned out that NiII impurities present in commercial FeCl2 (98 % pure) catalyzed this alkyl–aryl cross‐coupling reaction.
Highly functionalized organometallics are efficiently prepared in larger quantities (up to 4 g) by directed ortho-metalation using the previously reported amide bases TMP2Mn˙2MgCl2˙4LiCl (TMP = 2,2,6,6-tetramethylpiperidyl), TMP2Fe˙2MgCl2˙4LiCl and TMP3La˙3MgCl2˙5LiCl. The resulting organometallics undergo various reactions with electrophiles like acid chlorides, alkyl iodides, or aldehydes and provide