The reductive Heck hydroarylation of unactivated alkenes
has emerged
as an essential reaction for regioselective hydroarylation. Herein,
we report a palladium-catalyzed reductive Heck hydroarylation of unactivated
alkenes under mild conditions with enhanced functional group tolerance
using hydrosilane as the reducing reagent. Under the optimal conditions,
the alkylarene yields increased, resulting in minimal undesired products.
Mechanistic studies using deuterated reagents indicated the involvement
of two competing catalytic cycles.