Reaktion #514619

Reaktionsgleichung

water

4-Bromobenzyl bromide

N-(4-pyridyl)piperazine

sodium hydride

→

1-(4-pyridyl)-4-(4-bromobenzyl)piperazine

Ausbeute 29.8%

Lösungsmittel

dimethylformamide

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturthe mixture heated slowly to 60° C.
2. 2
   Temperaturmaintained at this temperature for 2 hours
3. 3
   ExtraktionNaHCO3 solution and then extracted with diethyl ether
4. 4
   WaschenThe organic extracts were then washed with aq
5. 5
   TrocknenNaHCO3, water, brine, dried (Na2SO4)
6. 6
   Sonstigeevaporated
7. 7
   SonstigeThe residue was recrystallised from acetonitrile

Vorschrift

A solution of N-(4-pyridyl)piperazine (0.33 g) in dry dimethylformamide (15 ml) was treated with sodium hydride (0.14 g) (45-55% dispersion in oil). The reaction mixture was then stirred for 45 minutes at ambient temperature under argon. 4-Bromobenzyl bromide (0.58 g) was added and the mixture heated slowly to 60° C. and then maintained at this temperature for 2 hours. The resulting mixture was then poured into water, basified with aq.NaHCO3 solution and then extracted with diethyl ether. The organic extracts were then washed with aq.NaHCO3, water, brine, dried (Na2SO4) and evaporated. The residue was recrystallised from acetonitrile to give 1-(4-pyridyl)-4-(4-bromobenzyl)piperazine (0.2 g) as a solid, m.p. 140-141° C.; microanalysis, found: C,55.3; H,5.2; N,12.0%; C16H18N3Br requires: C,55.4; H,5.7; N,12.1%; NMR: (CDCl3) 2.54(t,4H); 3.2(t,4H); 3.51(s,2H); 6.66(d,2H); 7.23(d,2H); 7.46(d,2H); 8.29(d,2H); MS: m/z 332 (MH)+.

Quelle