Recent advances in enantioselective [2 + 2 + 2] cycloaddition
Takanori Shibata1, Kyoji Tsuchikama
1Department of Chemistry and Biochemistry, School of Advanced Science and Engineering, Waseda University, 65-502B 3-4-1, Ohkubo, Shinjuku, Tokyo, 1698555, Japan.
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.
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