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- W2953119358 abstract "A new kind of complex prepared from scandium(III) triflate and l-proline-derived N,N‘-dioxides has been developed to catalyze the enantioselective aza-Diels−Alder reaction between 1,3-butadiene (diene 1) and aldimines 2, affording the corresponding 2,5-disubstituted dihydropyridinones in moderate to high yields (up to 92%) with good enantioselectivities (up to 90% ee) at room temperature. A variety of aldimines including aromatic, heteroaromatic, conjugated, and aliphatic imines were found to be suitable substrates. Enantiopure samples (up to 99% ee) were obtained for some products by a single recrystallization. The absolute configuration of the products was determined by X-ray diffraction and CD analysis. On the basis of the investigation of 1H NMR spectra and the positive nonlinear effect, the catalyst structure was carefully discussed." @default.
- W2953119358 created "2019-06-27" @default.
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- W2953119358 date "2008-05-13" @default.
- W2953119358 modified "2023-09-23" @default.
- W2953119358 title "ChemInform Abstract: Enantioselective Aza-Diels-Alder Reaction of Aldimines with “Danishefsky-Type Diene” Catalyzed by Chiral Scandium(III)-N,N′-Dioxide Complexes." @default.
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- W2953119358 doi "https://doi.org/10.1002/chin.200820135" @default.
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