反応式
[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([S:8]([NH:11][CH3:12])(=[O:10])=[O:9])=[CH:4][C:3]=1[N+:13]([O-])=O.[NH4+].[Cl-]>CCO.O.[Fe]>[NH2:13][C:3]1[CH:4]=[C:5]([S:8]([NH:11][CH3:12])(=[O:9])=[O:10])[CH:6]=[CH:7][C:2]=1[Cl:1]参加物
反応条件
- 温度
- 90 °C
実験手順
A solution of 4-chloro-N-methyl-3-nitrobenzenesulfonamide (6.35 g, 25.3 mmol) in EtOH (150 mL) and water (50.0 mL) was treated with iron (14.15 g, 253 mmol) and NH4Cl (13.55 g, 253 mmol) and heated at 90° C. for 4 hours before being cooled and filtered through celite. The filter cake was washed with EtOAc and the combined filtrate was filtered again to remove precipitated NH4Cl before being concentrated. The resulting crude material was partitioned between 350 ml EtOAc and 50 ml saturated aqueous NaHCO3. The organic layer was washed with brine, dried over MgSO4, concentrated and subjected to flash column chromatography (330 g silica gel, 0-15% EtOAc/DCM) to afford 3-amino-4-chloro-N-methylbenzenesulfonamide (5.60 g, 100%) as a light yellow crystalline solid. 1H NMR (400 MHz, MeOD) δ ppm 7.39 (d, J=8.28 Hz, 1 H), 7.27 (d, J=2.26 Hz, 1 H), 7.03 (dd, J=8.28, 2.26 Hz, 1 H), 2.54 (s, 3 H). MS 221.0 (M+H+).
後処理
- temperaturebefore being cooled
- filtrationfiltered through celite
- washThe filter cake was washed with EtOAc
- filtrationthe combined filtrate was filtered again
- customto remove
- customprecipitated NH4Cl
- concentrationbefore being concentrated
- customThe resulting crude material was partitioned between 350 ml EtOAc and 50 ml saturated aqueous NaHCO3
- washThe organic layer was washed with brine
- dry with materialdried over MgSO4
- concentrationconcentrated
出典と根拠
- ORDレコード
- ord-26c3d12832794095993a78f98c765b3d
- 出典データセット
- uspto-grants-2014_10
- 特許番号
- US08859571B2
関連ノート
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