Volume 57, Issue 48 pp. 15852-15856
Communication

Highly Diastereo- and Enantioselective Synthesis of Nitrile-Substituted Cyclopropanes by Myoglobin-Mediated Carbene Transfer Catalysis

Dr. Ajay L. Chandgude

Dr. Ajay L. Chandgude

Department of Chemistry, University of Rochester, 120 Trustee Road, Rochester, NY, 14627 USA

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Prof. Dr. Rudi Fasan

Corresponding Author

Prof. Dr. Rudi Fasan

Department of Chemistry, University of Rochester, 120 Trustee Road, Rochester, NY, 14627 USA

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First published: 09 October 2018
Citations: 88

Graphical Abstract

One for many: A chemobiocatalytic strategy involving myoglobin-catalyzed olefin cyclopropanation in the presence of ex situ generated diazoacetonitrile enables the efficient synthesis of a broad range of nitrile-substituted cyclopropanes with high diastereo- and enantioselectivity. The enzymatic product could be further elaborated to afford a variety of functionalized chiral cyclopropanes.

Abstract

A chemobiocatalytic strategy for the highly stereoselective synthesis of nitrile-substituted cyclopropanes is reported. The present approach relies on an asymmetric olefin cyclopropanation reaction catalyzed by an engineered myoglobin in the presence of ex situ generated diazoacetonitrile within a compartmentalized reaction system. This method enabled the efficient transformation of a broad range of olefin substrates at a preparative scale with up to 99.9 % de and ee and up to 5600 turnovers. The enzymatic product could be further elaborated to afford a variety of functionalized chiral cyclopropanes. This work expands the range of synthetically valuable, abiotic transformations accessible through biocatalysis and paves the way to the practical and safe exploitation of diazoacetonitrile in biocatalytic carbene transfer reactions.

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