反应详情

200 mg of (S)-5-(biphenyl-4-carbonyl)pyrrolidin-2-one of example 2 were suspended in 3 ml THF. 20 mg of sulphuric acid and 5 mg of palladium on carbon 10% m/m (W. C. Heraeus GmbH, Type K-0218) were added and the mixture was stirred under 3 bar hydrogen for about 20 hours. The mixture was neutralised with 50 mg sodium carbonate and the precipitate removed by filtration. The filtrate was concentrated to dryness to obtain (S)-5-biphenyl-4-ylmethylpyrrolidin-2-one. 1H-NMR (DMSO): 1.66 (1H, m, 4-CHH); 1.94 (1H, m, 4-CHH); 2.01 (2H, m, 3-CH2); 2.65 (1H, dd, 1-CHH); 2.84 (1H, dd, 1-CHH); 3.78 (1H, m, 5-CH); 7.30 (2H, d, aromatic); 7.33 (1H, m, aromatic); 7.43 (2H, t, aromatic); 7.57 (2H, d, aromatic); 7.63 (2H, m, aromatic); 7.81 (1H, s, NH). m/z: 252 (MH+, 100%).

1. customthe precipitate removed by filtration
2. concentrationThe filtrate was concentrated to dryness