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Yang Z, Zeng J, Ren N, Meng W, Nie J, Ma J. C2-Symmetric Chiral Bisoxazolines as Hydrogen-Bond-Acceptor Catalysts in Enantioselective Aldol Reaction of β-Carbonyl Acids with Trifluoroacetaldehyde Hemiacetals. Org. Lett. 2016 Nov 22;18(24):6364–7. doi: 10.1021/acs.orglett.6b03256. |