1-Methylpiperazine → HCID 23078910, compound

To a solution of methyl 3-(2-nitrobenzenesulfonylamino)propionate (6.15 g) in ethanol (20 mL)-methanol (5 mL) was added 5 mol/L aqueous sodium hydroxide solution (20 mL), and the mixture was stirred at room temperature overnight. The reaction mixture was acidified by addition of 2 mol/L hydrochloric acid (55 mL), and the resulting mixture was extracted with ethylacetate. The extract was washed with water and brine, and dried over anhydrous sodium sulfate. The solvent was removed under reduced pressure, and the residue was treated with n-hexane and ethylacetate. The precipitated crystals were collected by filtration, washed with n-hexane and dried under reduced pressure to give 3-(2-nitrobenzenesulfonylamino)propionic acid (5.83 g). To a solution of the obtained 3-(2-nitrobenzenesulfonylamino)propionic acid (0.5 g) in tetrahydrofuran (5 mL) was added 1,1′-carbonylbis-1H-imidazole (0.35 g), and the mixture was stirred at room temperature for 2 hours. To the reaction mixture was added 1-methylpiperazine (0.46 g), and the mixture was stirred at 50° C. for 3 days. The reaction mixture was concentrated under reduced pressure, and the residue was purified by column chromatography on aminopropylated silica gel (eluent: dichloromethane/methanol 40/1) to give the title compound (0.61 g).

1. stirringthe mixture was stirred at 50° C. for 3 days
2. concentrationThe reaction mixture was concentrated under reduced pressure
3. customthe residue was purified by column chromatography on aminopropylated silica gel (eluent: dichloromethane/methanol 40/1)

ORD record

ord-e0f9ca0472bb40c4989ed620bddb9507

Source dataset

uspto-grants-2012_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08324176B2