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Double and Single Hydroboration of Nitriles Catalyzed by a Ruthenium–Bis(silyl)xanthene Complex: Application to One-Pot Synthesis of Diarylamines and N‑Arylimines

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journal contribution
posted on 06.03.2019, 16:20 by Takeo Kitano, Takashi Komuro, Hiromi Tobita
A ruthenium complex bearing a bis­(silyl)­xanthene chelate ligand xantsil, i.e. Ru­[κ3(Si,O,Si)-xantsil]­(CO)­(PCyp3) (1a, Cyp = cyclopentyl), was found to catalyze both double and single hydroboration reactions of nitriles with pinacolborane (HBpin) and 9-borabicyclo[3.3.1]­nonane (9-BBN) to give bis­(boryl)­amines 2 and N-borylimines 3, respectively, in mostly >99% yields. By combination of these reactions with subsequent palladium-catalyzed deborylative C–N coupling reactions of 2 and 3 with a 1:1 mixture of bromoarenes and KOtBu, one-pot synthetic routes to tertiary N,N-diarylamines 4 and N-arylaldimines 5 from nitriles were developed.