title: P450-catalyzed intramolecularsp3C-H amination with arylsulfonyl azide substrates.
abstract: The direct amination of aliphatic C-H bonds represents a most valuable transformation in organic chemistry. While a number of transition metal-based catalysts have been developed and investigated for this purpose, the possibility to execute this transformation with biological catalysts has remained largely unexplored. Here, we report that cytochrome P450 enzymes can serve as efficient catalysts for mediating intramolecular benzylic C-H amination reactions in a variety of arylsulfonyl azide compouds. Under optimized conditions, the P450 catalysts were found to support up to 390 total turnovers leading to the formation of the desired sultam products with excellent regioselectivity. In addition, the chiral environment provided by the enzyme active site allowed for the reaction to proceed in a stereo- and enantioselective manner. The C-H amination activity, substrate profile, and enantio/stereoselectivity of these catalysts could be modulated by utilizing enzyme variants with engineered active sites.
authors.affiliation: Department of Chemistry, University of Rochester, Rochester, New York 14627.
authors.forename: Ritesh
authors.initials: R
authors.lastname: Singh
authors.affiliation: Department of Chemistry, University of Rochester, Rochester, New York 14627.
authors.forename: Melanie
authors.initials: M
authors.lastname: Bordeaux
authors.affiliation: Department of Chemistry, University of Rochester, Rochester, New York 14627.
authors.forename: Rudi
authors.initials: R
authors.lastname: Fasan
keywords: C—H amination; arylsulfonyl azides; cytochrome P450; enzymatic catalysis; protein engineering; sultams