Abstract
On the basis of the chiral ion pair between catalytic anionic stereogenic-at-cobalt(III) complexes and halonium ion intermediates, an asymmetric halogenation/semipinacol rearrangement reaction has been established using N-bromosuccinimide as the halogen source. This protocol provides an alternative approach for accessing a diverse set of chiral β-bromocycloketones in good yields with high enantioselectivities (≤96% yield, 95.5:4.5 er).
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