title: Catalytic asymmetric [4 + 2] cycloadditions of ketenes and N-thioacyl imines: alternatives for direct mannich reactions of enolizable imines.
authors.affiliation: University of Pittsburgh Center for Chemical Methodologies and Library Development, Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA.
authors.forename: Xuan
authors.initials: X
authors.lastname: Xu
authors.forename: Kan
authors.initials: K
authors.lastname: Wang
authors.forename: Scott G
authors.initials: SG
authors.lastname: Nelson
mesh_terms: D000215:Acylation; D002384:Catalysis; D003500:Cyclization; D005030:Ethylenes / Q000737:chemistry*; D006844:Hydrocarbons, Cyclic / Q000737:chemistry*; D007097:Imines / Q000737:chemistry*; D007659:Ketones / Q000737:chemistry*; D008956:Models, Chemical; D013237:Stereoisomerism; D013438:Sulfhydryl Compounds / Q000737:chemistry*