Reaktion #2348

Reaktionsgleichung

4-benzyloxybromobenzene

4-(4-pyridyl) piperazin-2-one

potassium hydride

→

ammonia

4-benzyloxy [4-(4-pyridyl)piperazin-2-one-1-yl]benzene

Ausbeute 123.3%

Lösungsmittel

water

brine

dimethyl formamide

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGthe mixture stirred at 140° C. in an argon atmosphere for 2 hr
2. 2
   Extraktionextracted with dichloromethane (3×40 ml)
3. 3
   Waschenthe combined extracts were washed with water and brine
4. 4
   Sonstigedried (PS paper)
5. 5
   Sonstigeevaporated
6. 6
   Sonstigeto give crude product as a pasty solid (2.0 g)
7. 7
   SonstigeThis was purified by flash chromatography on silica
8. 8
   Wascheneluting with dichloromethane/methanol/conc

Vorschrift

To a stirred suspension of 4-(4-pyridyl) piperazin-2-one (880 mg) in dimethyl formamide (20 ml) was added potassium hydride (1.0 ml of a 20% dispersion) and the mixture stirred for 0.5 hr, after which time was added copper (I) iodide (1.0 g). After 0.25 hr there was added 4-benzyloxybromobenzene (1.2 g) and the mixture stirred at 140° C. in an argon atmosphere for 2 hr. The reaction mixture was diluted with water and brine and extracted with dichloromethane (3×40 ml); the combined extracts were washed with water and brine, dried (PS paper) and evaporated to give crude product as a pasty solid (2.0 g). This was purified by flash chromatography on silica, eluting with dichloromethane/methanol/conc. ammonia (97:2.5:0.5 v/v) to give 4-benzyloxy [4-(4-pyridyl)piperazin-2-one-1-yl]benzene as a colourless solid (1.1 g) NMR δ (d6DMSO): 3.7-3.9 (4H,m); 4.1 (2H,s); 5.1 (2H,s); 6.85 (2H,d); 7.05 (2H,d); 7.25 (2H,d); 7.3-7.6 (5H,m); 8.2 (2H,d); m/e 360 (M+H)+.

Quelle