[CH3:1][NH:2][CH2:3][CH2:4][C:5]1[CH:10]=[CH:9][CH:8]=[CH:7][N:6]=1.[C:11]([NH:14][C:15]1[CH:20]=[CH:19][C:18]([S:21](Cl)(=[O:23])=[O:22])=[CH:17][CH:16]=1)(=[O:13])[CH3:12].O>CC(C)=O>[CH3:1][N:2]([CH2:3][CH2:4][C:5]1[CH:10]=[CH:9][CH:8]=[CH:7][N:6]=1)[S:21]([C:18]1[CH:17]=[CH:16][C:15]([NH:14][C:11](=[O:13])[CH3:12])=[CH:20][CH:19]=1)(=[O:23])=[O:22](prepared according to an analogous procedure described in U.S. Pat. No. 5,755,873) Step A: Methyl-(2-pyridin-2-ylethyl)amine (8.9 ml, 0.0643 mol) was dissolved in acetone (13 ml) and cooled to 0° C., 4-acetylaminobenzenesulfonyl chloride (5 g, 0.0214 mol) was added over 10 min. Additional acetone (5 ml) was added and the mixture was heated at reflux for 2 h. After cooling to rt, the mixture was added to water and extracted with EtOAc. The extracts were dried (MgSO4). The mixture was concentrated under reduced pressure and purified by flash chromatography (SiO2, EtOAc-MeOH/EtOAc 1:19) to give 5.6 g of N-{4-[methyl-(2-pyridin-2-yl-ethyl)sulfamoyl]phenyl}acetamide. Step B: The compound from step A (5.6 g) was suspended in water (22.4 ml), treated with concentrated HCl (13.4 ml), and the mixture heated at reflux for 1 h. After cooling to rt, NH4OH (13.7 ml) was added with stirring. The resulting mixture was extracted with CH2Cl2; the extracts were washed with water, dried (MgSO4), and concentrated under reduced pressure to give 4.8 g of 4-amino-N-methyl-N-(2-pyridin-2-ylethyl)benzenesulfonamide. LCMS: MH+=292.0.
読み込み中…
