Volume 63, Issue 2 e202316064
Communication

Vitamin B12-Photocatalyzed Cyclopropanation of Electron-Deficient Alkenes Using Dichloromethane as the Methylene Source**

John Hayford G. Teye-Kau

John Hayford G. Teye-Kau

Department of Chemistry, Oklahoma State University, 107 Physical Sciences, Stillwater, OK 74078 USA

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Mayokun J. Ayodele

Mayokun J. Ayodele

Weaver Labs LLC, 1110 S. Innovation Way Dr., #130, Stillwater, OK 74074 USA

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Prof. Spencer P. Pitre

Corresponding Author

Prof. Spencer P. Pitre

Department of Chemistry, Oklahoma State University, 107 Physical Sciences, Stillwater, OK 74078 USA

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First published: 28 November 2023
Citations: 33
**

A previous version of this manuscript has been deposited on a preprint server (https://doi.org/10.26434/chemrxiv-2023-m3shw).

Graphical Abstract

We report a vitamin B12-photocatalyzed strategy for the cyclopropanation of electron-deficient alkenes using dichloromethane (CH2Cl2) as the methylene source. The reaction has excellent functional group tolerance, is highly chemoselective, and the scope can be extended to other 1,1-dichloroalkanes for the preparation of D2-cyclopropyl and methyl-substituted cyclopropyl adducts, all of which are important isosteres in medical chemistry.

Abstract

The cyclopropyl group is of great importance in medicinal chemistry, as it can be leveraged to influence a range of pharmaceutical properties in drug molecules. This report describes a Vitamin B12-photocatalyzed approach for the cyclopropanation of electron-deficient alkenes using dichloromethane (CH2Cl2) as the methylene source. The reaction proceeds in good to excellent yields under mild conditions, has excellent functional group compatibility, and is highly chemoselective. The scope could also be extended to the preparation of D2-cyclopropyl and methyl-substituted cyclopropyl adducts starting from CD2Cl2 and 1,1-dichloroethane, respectively.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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