Our most recent collaboration is already on-line at Angew. Chem. Int. Ed.01/05/2023
We are very happy to share our Angew. Chem. Int. Ed. paper in collaboration with Jimenez-Osés research group has been accepted and it's already available through the journal website. This work is entitled "Iridium-Catalyzed ortho-Selective Borylation of Aromatic Amides Enabled by 5-Trifluoromethylated Bipyridine Ligands" and authored by D. Marcos-Atanes, C. Vidal, C. Navo, F. Pecatti, G. Jiménez-Osés and J. L. Mascareñas.
Abstract: Iridium-catalyzed borylations of aromatic C–H bonds are highly attractive transformations owing to the diversification possibilities offered by the resulting boronates. These transformations are best carried out using bidentate bipyridine or phenanthroline ligands, and tend to be governed by steric factors, therefore resulting in the competitive functionalization of meta and/or para positions. We have now discovered that a subtle change in the bipyridine ligand, namely, the introduction of a CF3 substituent at position 5, enables a complete alteration of regioselectivity in the borylation of aromatic amides, providing for the synthesis of a wide variety of ortho-borylated derivatives. Importantly, thorough computational studies suggest that the exquisite regio- and chemoselectivity stems from unusual outer-sphere interactions between the amide group of the substrate and the CF3–substituted aryl ring of the bipyridine ligand.
External link: https://onlinelibrary.wiley.com/doi/10.1002/anie.202214510