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A novel route to 1,3-oxazaheterocycles based on cooperative Ru-H/Brønsted acid catalysis is reported. The use of the commercially available RuH2(CO)(PPh3)3 complex allows for an efficient long distance chain-walking process while the Brønsted acid is responsible for generation of an electrophilic iminium ion which is trapped intramolecularly by an alcohol moiety. The alcohol, besides its nucleophilic function, also plays an important role in the stabilization of the Ru catalyst.

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Tandem Long Distance Chain-Walking/Cyclization via RuH2(CO)(PPh3)3/Brønsted Acid Catalysis: Entry to Aromatic Oxazaheterocycles