Abstract
The difluoromethyl group (R-CF2H) imparts desirable pharmacokinetic properties to drug molecules and is commonly targeted as a terminal functional group that is not amenable to further modification. Deprotonation of widely available Ar-CF2H starting materials to expose nucleophilic Ar-CF2- synthons represents an unexplored, yet promising route to construct benzylic Ar-CF2-R linkages. Here we show that the combination of a Brønsted superbase with a weak Lewis acid enables deprotonation of Ar-CF2H groups and capture of reactive Ar-CF2- fragments. This route provides access to isolable and reactive Ar-CF2- synthons that react with a broad array of electrophiles at room temperature. The methodology is highly general in both electrophile and difluoromethyl (hetero)arene and can be applied directly to the synthesis of benzylic difluoromethylene (Ar-CF2-R) linkages, which are useful lipophilic and metabolically resistant replacements for benzylic linkages in medicinal chemistry.
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