Fig. 2: The scope of alkyl bromidesa.

aReaction conditions: 1 (0.3 mmol), 2a (0.45 mmol), 3a (0.45 mmol), NiBr2 (10 mol%), Mn (0.9 mmol), DMA (3 mL), 35 °C, 36 h, N2 atmosphere. Isolated yield was shown. b(3-iodopropyl)benzene was used instead of (3-bromopropyl)benzene. c(3-chloropropyl)benzene was used instead of (3-bromopropyl)benzene. dL5 (12 mol%) was used as the additive. ediastereomeric ratio can’t be determined by Proton Nuclear Magnetic Resonance and High Performance Liquid Chromatography. Boc tert-butyloxycarbonyl, Ts tosyl.