Palladium-Catalyzed Stereoselective Defluoroborylation of <i>gem</i>-Difluoroalkenes with Unsymmetrical Diboron: Access to Tetrasubstituted Monofluorinated Vinyl–B(dan) Derivatives

Abstract

The stereoselective C–F bond borylation of tetrasubstituted β,β-difluoroacrylates has been achieved. In contrast to the previously used B 2 pin 2 reagent, which only led to dimerization products, this work employs the unsymmetrical diboron reagent (pin)B–B(dan) under the palladium(0)-catalyzed conditions to access novel boronamides containing the monofluorinated vinyl–B(dan) functionality. These compounds can cross-couple directly with gem -difluoroalkenes without reactivation in Suzuki–Miyaura reactions to afford vincinal difluoro 1,3-dienes with modular control of the substituents.

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