Stereospecific Allylic Functionalization: The Reactions of Allylboronate Complexes with Electrophiles

Garcia-Ruiz, Cristina; Chen, Jack L.-Y.; Sandford, Christopher; Feeney, Kathryn; Lorenzo, Paula; Berionni, Guillaume; Mayr, Herbert und Aggarwal, Varinder K. (2017): Stereospecific Allylic Functionalization: The Reactions of Allylboronate Complexes with Electrophiles. In: Journal of the American Chemical Society, Bd. 139, Nr. 43: S. 15324-15327

Abstract

Allylboronic esters react readily with carbonyls and imines (pi-electrophiles), but are unreactive toward a range of other electrophiles. By addition of an aryllithium, the corresponding allylboronate complexes display enhanced nucleophilicity, enabling addition to a range of electrophiles (tropylium, benzodithiolylium, activated pyridines, Eschenmoser's salt, Togni's reagent, Selectfluor, diisopropyl azodicarboxylate (DIAD), MeSX) in high regio- and stereocontrol. This protocol provides access to key new functionalities, including quaternary stereogenic centers bearing moieties such as fluorine and the trifluoromethyl group. The allylboronate complexes were determined to be 7 to 10 orders o f magnitude more reactive than the parent boronic ester.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Chemie und Pharmazie > Department Chemie
• Themengebiete: 500 Naturwissenschaften und Mathematik > 540 Chemie
• ISSN: 0002-7863
• Sprache: Englisch