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38349027501
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note
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4 and 2.1 mol% 4j the α-amino acid derivatives were hydrogenated in excellent yields (methyl 2-acetamidocinnamate: 98%; methyl 2-acetamidoacrylate: >99%) and good enantioselectivities (methyl 2-acetyl phenylalanine: 87% ee; methyl 2-acetyl alanine: 71% ee) [reaction time: 24 h; hydrogen pressure: 1.3 bar; 25 °C; solvent: toluene]. Furthermore, the same catalyst was active in the hydrogenation of β-amino acid precursors. Here, (Z)-methyl 3-acetamidobut-2-enoate was hydrogenated with good enantioselectivity (64% ee (S), conversion: 53%; reaction time: 24 h; hydrogen pressure: 50 bar; 10 °C; 24 h; solvent: ethanol), while the hydrogenation of the corresponding E-isomer was poorly enantioselective (4% ee (S), conversion: 82%; reaction time: 24 h; hydrogen pressure: 2.5 bar; 10 °C; 24 h; solvent: 2-propanol).
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® A: for selective catalytic applications see:
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