Highly diastereoselective and enantioselective olefin cyclopropanation using engineered myoglobin-based catalysts.

ABSTRACT: Using rational design, an engineered myoglobin-based catalyst capable of catalyzing the cyclopropanation of aryl-substituted olefins with catalytic proficiency (up to 46,800 turnovers) and excellent diastereo- and enantioselectivity (98-99.9%) was developed. This transformation could be carried out in the presence of up to 20 g L(-1) olefin substrate with no loss in diastereo- and/or enantioselectivity. Mutagenesis and mechanistic studies support a cyclopropanation mechanism mediated by an electrophilic, heme-bound carbene species and a model is provided to rationalize the stereopreference of the protein catalyst. This work shows that myoglobin constitutes a promising and robust scaffold for the development of biocatalysts with carbene-transfer reactivity.

SUBMITTER: Bordeaux M 

PROVIDER: S-EPMC4470557 | biostudies-literature | 2015 Feb

REPOSITORIES: biostudies-literature