[OH:1][C:2]1[CH:3]=[C:4]([CH:10]2[CH2:14][NH:13][C:12](=[O:15])[CH2:11]2)[CH:5]=[CH:6][C:7]=1[O:8][CH3:9].[C:16]1([CH2:22][CH2:23][CH2:24]Br)[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1.C(=O)([O-])[O-].[K+].[K+]>CN(C)C=O>[C:16]1([CH2:22][CH2:23][CH2:24][O:1][C:2]2[CH:3]=[C:4]([CH:10]3[CH2:14][NH:13][C:12](=[O:15])[CH2:11]3)[CH:5]=[CH:6][C:7]=2[O:8][CH3:9])[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1A mixture of 4-(3-hydroxy-4-methoxyphenyl)-2-pyrrolidone (42 mg, 0.2 mmol), 3-phenylpropyl bromide (44 mg, 0.22 mmol), potassium carbonate (83 mg, 0.6 mmol) and N,N-dimethylformamide (3 ml) is allowed to stir at 100° C. After 18 hours, the reaction mixture is cooled to 25° C. The solid is filtered off and the filtrate is concentrated under vacuum. The same working up procedure gives 47 mg (72%) of 4-(3-(3-phenylpropoxy)-4-methoxyphenyl)-2-pyrrolidone: 1H NMR (300 MHz, CDCl3) δ 7.34-7.17 (m, 5H), 6.82 (d, J=8.4 Hz, 1H), 6.78 (d, J=12 Hz, 1H), 6.70 (s, 1H), 6.02 (b, 1H), 4.03 (t, J=7.2 Hz, 2H), 3.84 (s, 3H), 3.75 (t, J=8.8 Hz, 1H), 3.63-3.55 (m, 1H), 3.36 (t, J=8.8 Hz, 1H), 2.82 (t, J=8.0 Hz, 2H), 2.71 (dd, J=16.8, 8.8 Hz, 2H), 2.47 (dd, J=16.6, 8.8 Hz), 2.20-2.13 (m, 2H).
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