title: Recent advances in enantioselective [2 + 2 + 2] cycloaddition.
abstract: Enantioselective cycloaddition using chiral transition metal catalysts is an atom-economical and efficient synthetic tool for the construction of chiral carbo- and heterocyclic skeletons. This short account discloses our recent results of inter- and intramolecular enantioselective [2 + 2 + 2] cycloadditions of alkyne and/or alkene moiety(ies). Chiral iridium complexes catalyzed the alkyne trimerization for the generation of axial chirality(ies), and chiral rhodium ones catalyzed alkyne-alkyne-alkene cyclization for the generation of a quaternary carbon including spirocyclic system.
authors.affiliation: Department of Chemistry and Biochemistry, School of Advanced Science and Engineering, Waseda University, 65-502B 3-4-1, Ohkubo, Shinjuku, Tokyo, 1698555, Japan.
authors.forename: Takanori
authors.initials: T
authors.lastname: Shibata
authors.forename: Kyoji
authors.initials: K
authors.lastname: Tsuchikama
mesh_terms: D000475:Alkenes / Q000138:chemical synthesis* / Q000737:chemistry; D000480:Alkynes / Q000138:chemical synthesis* / Q000737:chemistry; D003500:Cyclization; D007495:Iridium / Q000737:chemistry*; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000737:chemistry*; D012238:Rhodium / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D000475:Alkenes; D000480:Alkynes; D009942:Organometallic Compounds; D007495:Iridium; D012238:Rhodium