PyBidine–NiCl₂‑Catalyzed Asymmetric Addition of Alcohols and Peroxides to Isatin-Derived Ketimines

An (S,S)-diphenyldiamine-derived bis­(imidazolidine)­pyridine (PyBidine)–NiCl₂ complex catalyzed the asymmetric addition of methanol and peroxides to isatin-derived N-Boc-imines to form chiral quaternary N,O-acetals at the C3 position of the resulting oxiindoles in up to 99% yield with 94% ee.