Switchable C–H Functionalization of N‑Tosyl Acrylamides with Acryloylsilanes

A controllable Rh-catalyzed protocol to access alkylation and alkenylation–annulation of N-tosyl acrylamide with acryloyl silane is reported. In contrast to the directing group or catalyst-dependent divergent sp2 C–H alkylation/alkenylation, the intrinsic property of acryloylsilane allows the switchable reaction manifold, thereby affording either alkylation or annulation products with slight modification of the reaction conditions.