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Nuhant P, Raikar SB, Wypych J, Delpech B, Marazano C. Enhancement of 5-Aminopenta-2,4-dienals Electrophilicity via Activation by O,N-Bistrifluoroacetylation. Application to an N-Acyl Pictet−Spengler Reaction. J. Org. Chem. 2009 Nov 19;74(24):9413–21. doi: 10.1021/jo9019545. |