title: 2-Aminopyridinium ions activate nitroalkenes through hydrogen bonding.
abstract: 2-Aminopyridinium ions were found to activate nitroalkenes toward conjugate addition of heteroaromatic compounds with low catalyst loadings and the Diels-Alder reaction with the periselectivity opposite to that observed with metal Lewis acids, raising the possibility that a 2-aminopyridinium core might be a promising catalaphore for the asymmetric catalyst design.
authors.affiliation: Department of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, Florida 33146-0431, USA. n.takenaka@miami.edu
authors.forename: Norito
authors.initials: N
authors.lastname: Takenaka
authors.forename: Robindro Singh
authors.initials: RS
authors.lastname: Sarangthem
authors.forename: Sreehari Kumar
authors.initials: SK
authors.lastname: Seerla