title: Chiral N-heterocyclic carbene-catalyzed formal [4+2] cycloaddition of ketenes with enones: highly enantioselective synthesis of trans- and cis-delta-lactones.
authors.affiliation: Beijing National Laboratory for Molecular Sciences, Research Center of Chemical Biology, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China.
authors.forename: Yan-Rong
authors.initials: YR
authors.lastname: Zhang
authors.forename: Hui
authors.initials: H
authors.lastname: Lv
authors.forename: Di
authors.initials: D
authors.lastname: Zhou
authors.forename: Song
authors.initials: S
authors.lastname: Ye
mesh_terms: D003500:Cyclization; D005030:Ethylenes / Q000737:chemistry*; D006571:Heterocyclic Compounds / Q000737:chemistry*; D007659:Ketones / Q000737:chemistry*; D007783:Lactones / Q000138:chemical synthesis* / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D008697:Methane / Q000031:analogs & derivatives* / Q000737:chemistry; D021241:Spectrometry, Mass, Electrospray Ionization; D013237:Stereoisomerism
chemical_list: D005030:Ethylenes; D006571:Heterocyclic Compounds; D007659:Ketones; D007783:Lactones; C030011:carbene; C008223:ketene; D008697:Methane