Carbon-Carbon Bond-Forming Enantioselective Synthesis of Chiral Organosilicon Compounds by Rhodium/Chiral Diene-Catalyzed Asymmetric 1,4-Addition Reaction
Ryo Shintani, Kazuhiro Okamoto and Tamio Hayashi*
*Department of Chemistry, Graduate School of Science, Kyoto University,
Sakyo, Kyoto 606-8502, Japan, Email: thayashi
kuchem.kyoto-u.ac.jp
R. Shintani, K. Okamoto, T. Hayashi, Org. Lett., 2005, 7, 4757-4759.
DOI: 10.1021/ol051978+ (free Supporting Information)
Abstract
An enantioselective, rhodium-catalyzed 1,4-addition of arylboronic acids to β-silyl α,β-unsaturated carbonyl compounds has been developed employing (R,R)-Bn-bod* as a ligand, which allows the synthesis of various β-silyl 1,4-adducts in very high enantiomeric excess. Subsequent conversions of the chiral organosilicon compounds to β-hydroxy carbonyl compounds or allylsilanes under retention of the configuration of the stereogenic center are described.
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Key Words
Conjugate Additions, Boronic Acids, Tamao Oxidation, β-hydroxy ketones
ID: J54-Y2005-1740
