Through-Space 1,4-Ni/H Shift: Unlocking Migration along Coupling Partners in Olefin Borylcarbofunctionalization.

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Olefin migratory functionalization is a well-established strategy for the selective installation of functional groups at remote C(sp3)-H positions along an alkyl chain. However, prior research has predominantly focused on migration along the alkene component. Herein, we describe a conceptually new migratory coupling strategy for the difunctionalization of alkenes, where migration selectively occurs along the C(sp2) coupling partner rather than the alkene component, facilitated by a through-space 1,4-Ni/H shift. This approach offers a modular three-component strategy for the selective and efficient construction of densely functionalized alkyl boronates from readily accessible chemicals. Moreover, by integrating the 1,2-Ni/H shift with the 1,4-Ni/H shift, this platform has been expanded to achieve a two-fold migration along both the alkene components and the coupling partners, facilitating selective borylative remote C(sp3)─H/C(sp2)─H cross-coupling.