Piperazine → 3-(3,4-Dimethoxyphenyl)-7-[2-hydroxy-3-(piperazin-1-yl)propoxy]-4H-chromen-4-one
Reaction equation
[CH3:1][O:2][C:3]1[CH:4]=[C:5]([C:11]2[C:20](=[O:21])[C:19]3[C:14](=[CH:15][C:16]([O:22][CH2:23][CH:24]4[CH2:26][O:25]4)=[CH:17][CH:18]=3)[O:13][CH:12]=2)[CH:6]=[CH:7][C:8]=1[O:9][CH3:10].[NH:27]1[CH2:32][CH2:31][NH:30][CH2:29][CH2:28]1>C(O)C>[CH3:1][O:2][C:3]1[CH:4]=[C:5]([C:11]2[C:20](=[O:21])[C:19]3[C:14](=[CH:15][C:16]([O:22][CH2:23][CH:24]([OH:25])[CH2:26][N:27]4[CH2:32][CH2:31][NH:30][CH2:29][CH2:28]4)=[CH:17][CH:18]=3)[O:13][CH:12]=2)[CH:6]=[CH:7][C:8]=1[O:9][CH3:10]Participants
4
Procedure
A mixture of compound 4 (obtained from example 2) (0.35 g, 1 mmol), piperazine (0.43 g, 5 mmol), and ethanol (30 mL) was refluxed for 6 hrs (TLC monitoring). After removal of solvent in vaccuo, the residue was treated with H2O (50 mL). The resulting precipitate was collected and purified by column chromatography (MeOH/CH2Cl2=1:25) to give the title compound 6b (0.25 g, 56% yield). M.p.: 84-85° C.