title: Microwave-assisted synthesis of highly substituted aminomethylated 2-pyridones.
abstract: By employing microwave-assisted organic synthesis (MAOS) efficient conditions to introduce aminomethylene substituents in highly substituted bicyclic 2-pyridones have been established. Primary amino methylene substituents were introduced via a cyanodehalogenation followed by a borane dimethyl sulfide reduction of the afforded nitrile. In both of these transformations, microwave irradiation proved to be superior to traditional conditions and the primary amines were obtained in good overall yields (55-58% over three steps). To incorporate tertiary aminomethylene substituents in the 2-pyridone framework, a microwave-assisted Mannich reaction using preformed iminium salts proved to be effective. Thus highly substituted 2-pyridones were obtained in 48-93% yields.
authors.affiliation: Organic Chemistry, Department of Chemistry, Umeå University, SE-90187 Umeå, Sweden.
authors.forename: Nils
authors.initials: N
authors.lastname: Pemberton
authors.forename: Veronica
authors.initials: V
authors.lastname: Aberg
authors.forename: Hanna
authors.initials: H
authors.lastname: Almstedt
authors.forename: Andreas
authors.initials: A
authors.lastname: Westermark
authors.forename: Fredrik
authors.initials: F
authors.lastname: Almqvist