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.
Cobalt-Catalyzed Negishi Cross-Coupling Reactions of (Hetero)Arylzinc Reagents with Primary and Secondary Alkyl Bromides and Iodides
作者:Jeffrey M. Hammann、Diana Haas、Paul Knochel
DOI:10.1002/anie.201411960
日期:2015.4.7
di(hetero)arylzinc reagents with primary and secondaryalkyliodides or bromides using THF‐soluble CoCl2⋅2 LiCl and TMEDA as a ligand, which leads to the corresponding alkylated products in up to 88 % yield. A range of functional groups (e.g. COOR, CN, CF3, F) are tolerated in these substitution reactions. Remarkably, we do not observe rearrangement of secondaryalkyliodides to unbranched products. Additionally