The anodic oxidation of 1-butyl-3-methylimidazolium tetrafluoroborate (BMIm-BF) efficiently generates BF from BF. This Lewis acid, strongly bound to the ionic liquids, can be efficiently used in classical BF-catalyzed reactions. We demonstrated the BF/BMIm-BF reactivity in four reactions, namely, a domino Friedel-Crafts/lactonization of phenols, the Povarov reaction, the Friedel-Crafts benzylation of anisole, and the multicomponent synthesis of tetrahydro-11-benzo[]xanthen-11-ones.
View Article and Find Full Text PDF