Roles reversed: An efficient cobalt‐catalyzed electrophilic amination of arylzinc reagents has been achieved. A variety of functionalized arylzincs and N‐chloroamines were coupled under mild conditions (see scheme). Both secondary and tertiary arylamines were obtained in moderate to excellent yields.
Symmetrical diaryl ketones were prepared by a cross-coupling reaction between aryl bromides and ethyl chloroformate. This new method, which uses a catalyst composed of CoBr2 and a bipyridine ligand along with readily available starting materials, allows for the synthesis of a variety of symmetrical diaryl ketones in moderate to excellent yields (37–99 %) under mild conditions. This reaction, in which
The Negishi cross-coupling reaction of arylzinc chlorides and bromides with functionalized vinylic tellurides in the presence of a catalytic amount of PdCl2 in THF at room temperature is described. This cross-coupling reaction is general and permits the synthesis of functionalized substituted alkenes in good yields and high stereoselectivity.