title: Benzothiazines in synthesis. Further studies of the intramolecular, stereoselective addition of sulfonimidoyl carbanions to alpha,beta-unsaturated functional groups.
abstract: A variety of alkenes substituted by electron-withdrawing groups serve as competent electrophiles for the stereoselective, intramolecular nucleophilic addition of sulfonimidoyl carbanions to form benzothiazines. This reaction generally proceeds with complete stereoselectivity within the limits of our detection. In some cases, benzothiazine formation occurs in a single pot at relatively high temperatures during N-arylation of the simple sulfoximine used in this study. Yet, the process occurs with the same direction and extent of stereoselectivity as that seen when the Michael addition is performed at very low temperatures.
authors.affiliation: Department of Chemistry, University of Missouri-Columbia, Columbia, Missouri 65211, USA. harmatam@missouri.edu
authors.forename: Michael
authors.initials: M
authors.lastname: Harmata
authors.forename: Kanok-on
authors.initials: KO
authors.lastname: Rayanil
authors.forename: Vinson R
authors.initials: VR
authors.lastname: Espejo
authors.forename: Charles L
authors.initials: CL
authors.lastname: Barnes
mesh_terms: D000475:Alkenes / Q000138:chemical synthesis* / Q000737:chemistry; D000838:Anions / Q000737:chemistry*; D001581:Benzothiadiazines / Q000138:chemical synthesis* / Q000737:chemistry*; D002384:Catalysis; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D015394:Molecular Structure; D013237:Stereoisomerism; D013329:Structure-Activity Relationship; D013452:Sulfonium Compounds / Q000737:chemistry*
chemical_list: D000475:Alkenes; D000838:Anions; D001581:Benzothiadiazines; D013452:Sulfonium Compounds