An enantioselective intramolecular C(sp3)–H amination of N-benzoyloxyurea by using a chiral-at-metal rutheniumcatalyst is reported, providing chiral 2-imidazolidinones in yields of up to 99% and with up to 99% ee. Catalyst loadings down to 0.05 mol % are feasible. Control experiments support a stepwise nitrene insertion mechanism through hydrogen atom transfer of a ruthenium nitrenoid intermediate