title: Aza-Morita-Baylis-Hillman reactions catalyzed by a cyclopropenylidene.
abstract: Catalysis using a bis(dialkylamino)cyclopropenylidene (BAC) has been developed, which relies on a formal umpolung activation of Michael acceptor pro-nucleophiles. Various aza-Morita-Baylis-Hillman reactions between aromatic, heteroaromatic, or aliphatic imines and acyclic or cyclic α,β-unsaturated ketones and carboxylic acid derivatives have been catalyzed by a BAC under mild conditions. Functionalities such as unprotected amino and hydroxy groups have been tolerated. The catalyst loading was decreased to 1 mol% without loss of activity. The BAC catalyst was shown to be substantially more active than a cyclic (alkyl)(amino) carbene (CAAC), N-heterocyclic carbenes (NHCs), and P- or N-centered Lewis bases.
authors.affiliation: The University of Edinburgh, EaStCHEM School of Chemistry, The King's Buildings, David Brewster Road, Edinburgh EH9 3FJ, UK. uwe.schneider@ed.ac.uk.
authors.forename: Xun
authors.initials: X
authors.lastname: Lu
authors.affiliation: The University of Edinburgh, EaStCHEM School of Chemistry, The King's Buildings, David Brewster Road, Edinburgh EH9 3FJ, UK. uwe.schneider@ed.ac.uk.
authors.forename: Uwe
authors.initials: U
authors.lastname: Schneider