Site-selective bromination of sp3 C-H bonds.

ABSTRACT: A method for converting sp3 C-H to C-Br bonds using an N-methyl sulfamate directing group is described. The reaction employs Rh2(oct)4 and a mixture of NaBr and NaOCl and is performed in aqueous solution open to air. For all sulfamates examined, oxidation occurs with high selectivity at the ?-carbon, affording a uniquely predictable method for C-H bond halogenation. Results from a series of mechanistic experiments suggest that substrate oxidation likely proceeds by a radical chain process. Initial formation of an N-halogenated sulfamate followed by Rh-mediated homolysis generates an N-centered radical, which serves as the active oxidant.

SUBMITTER: Sathyamoorthi S 

PROVIDER: S-EPMC5873043 | biostudies-literature | 2018 Jan

REPOSITORIES: biostudies-literature