An Aza-Enolate Strategy Enables Iridium-Catalyzed Enantioselective Hydroalkenylations of Minimally Polarized Alkenes en Route to Complex N-Aryl β2-Amino Acids
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作者:
Hong, Fenglin
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Univ Liverpool, Dept Chem, Liverpool L69 7ZD, EnglandUniv Liverpool, Dept Chem, Liverpool L69 7ZD, England
Hong, Fenglin
[1
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Robertson, Craig M.
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Univ Liverpool, Dept Chem, Liverpool L69 7ZD, EnglandUniv Liverpool, Dept Chem, Liverpool L69 7ZD, England
Robertson, Craig M.
[1
]
Bower, John F.
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Univ Liverpool, Dept Chem, Liverpool L69 7ZD, EnglandUniv Liverpool, Dept Chem, Liverpool L69 7ZD, England
Bower, John F.
[1
]
机构:
[1] Univ Liverpool, Dept Chem, Liverpool L69 7ZD, England
Cationic Ir(I)-complexes modified with homochiral diphosphines promote the hydroalkenylative cross-coupling of beta-(arylamino)acrylates with monosubstituted styrenes and alpha-olefins. The processes are dependent on the presence of an NH unit, and it is postulated that metalation of this generates an iridium aza-enolate that engages the alkene during the C-C bond forming event. The method offers high branched selectivity and enantioselectivity and occurs with complete atom economy. Diastereocontrolled reduction of the products provides beta(2)-amino acids that possess contiguous stereocenters.