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Transformable Sulfoximine Assisted One-Pot Double Annulation of Vinylic C-H Bonds with Unactivated Alkynes.

The methylphenyl sulfoximine (MPS) directing group (DG) successfully promotes the one-pot double annulation of acrylic acids with alkynes under Ru catalysis, which is unprecedented. Diverse arrays of pyrido-fused-isoquinolinone skeletons are fabricated from acrylamides, creating two C-C and two C-N bonds in a single operation. The unsymmetrical annulation with two distinct alkynes is presented. The recovery of methylphenyl sulfoxide, a precursor of MPS, validates the synthetic adaptability of transformable-DG (TfDG) in C-H activation.