Reaktion #317724

Reaktionsgleichung

4-Chloro-3-nitrobenzenesulphonyl chloride

naphthalen-1-ylamine

pyridine

→

naphthalen-1-yl-3-nitro-4-chloro-benzenesulphonamide

Ausbeute 78.3%

Lösungsmittel

DCM

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigethe volatiles were evaporated
2. 2
   workup.DISSOLUTIONThe crude mixture was dissolved in EtOAc
3. 3
   Waschenthe organic phase was washed with 1 N HCl
4. 4
   Trocknendried with MgSO4
5. 5
   Filtrationfiltered
6. 6
   Einengenconcentrated

Vorschrift

4-Chloro-3-nitrobenzenesulphonyl chloride (0.992 g, 3.87 mmol) was added to a solution of naphthalen-1-ylamine (0.665 g, 4.64 mmol) and pyridine (3.1 mL, 38.7 mmol) dissolved in DCM (5 mL). The solution was stirred at room temperature for 2 days and the volatiles were evaporated. The crude mixture was dissolved in EtOAc and the organic phase was washed with 1 N HCl, dried with MgSO4, filtered and concentrated to give 1.1 g of naphthalen-1-yl-3-nitro-4-chloro-benzenesulphonamide. Naphthalen-1-yl-3-nitro-4-chloro-benzenesulphonamide was dissolved in CH3CN (10 mL) and piperazine (0.683 g, 7.93 mmol) was added. The mixture was stirred at 65° C. for 16 hours. The mixture was concentrated and the crude product was purified by flash chromatography on silica using DCM→DCM/MeOH (10%)+aqueous NH3 (0.4 as eluent to give 0.531 g of the free base which was converted to its HCl-salt.

Quelle