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- W2043932168 abstract "The C2-symmetric complexes [Cu(S,S)-tert-butylbis(oxazolinyl)](SbF6)2 (2a), its bis(aquo) counterpart [Cu(S,S)-tert-butylbis(oxazolinyl)(H2O)2](SbF6)2 (4), and [Cu(S,S)-phenylbis(oxazolinyl)](OTf)2 (1c) have been shown to catalyze the enantioselective ene reaction between glyoxylate esters and various olefins. Monosubstituted, disubstituted, and trisubstituted olefins each react with ethyl glyoxylate in the presence of 0.2−10 mol % of catalysts 1, 2, and 4 to afford the ene products in good yield and enantioselectivity. Complex 2a has also been shown to catalyze the addition of 1,1-disubstituted olefins to methyl pyruvate in good yields (76−95%) and excellent enantioselectivies (≥98% ee). The synthetic utility of the glyoxylate−ene reaction was demonstrated by conversion of the resulting α-hydroxy ester into the corresponding methyl ester, free acid, Weinreb amide, and α-azido ester, all with no detectable racemization." @default.
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- W2043932168 title "<i>C</i><i><sub>2</sub></i>-Symmetric Copper(II) Complexes as Chiral Lewis Acids. Catalytic Enantioselective Carbonyl−Ene Reactions with Glyoxylate and Pyruvate Esters" @default.
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- W2043932168 doi "https://doi.org/10.1021/ja000913t" @default.
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