Reacción #2315

Ecuación de reacción

iso-Propyl 4-bromoacetylphenoxyacetate

1-(4-pyridyl)piperazine

→

title compound

iso-Propyl 4-[2-[4-(4-pyridyl)piperazin-1-yl]acetyl]-phenoxyacetate

Disolventes

acetonitrile

Condiciones de reacción

Tratamiento posterior

1. 1
   Otroovernight at ambient temperature when the precipitated solid was removed
2. 2
   OtroThe filtrate was evaporated in vacuo
3. 3
   Otrothe residue partitioned between ethyl acetate and water
4. 4
   SecadoThe organic phase was dried (MgSO4)
5. 5
   Otroevaporated
6. 6
   OtroPurification by flash chromatography on silica
7. 7
   Lavadoeluting firstly with 0 to 10% v/v methanol/dichloromethane
8. 8
   Otrotoluene/ethyl acetate/.880 ammonium hydroxide/ethanol (60:20:10:35 v/v/v/v), gave a cream solid
9. 9
   OtroRecrystallisation from iso-propanol

Procedimiento

iso-Propyl 4-bromoacetylphenoxyacetate (6.3 g) was added to a stirred, cooled (4° C.) solution of 1-(4-pyridyl)piperazine (6.5 g) in acetonitrile (225 ml). Stirring was continued for 1 hour at 4° C., then overnight at ambient temperature when the precipitated solid was removed. The filtrate was evaporated in vacuo and the residue partitioned between ethyl acetate and water. The organic phase was dried (MgSO4) and evaporated. Purification by flash chromatography on silica, eluting firstly with 0 to 10% v/v methanol/dichloromethane and then toluene/ethyl acetate/.880 ammonium hydroxide/ethanol (60:20:10:35 v/v/v/v), gave a cream solid. Recrystallisation from iso-propanol gave the title compound, 2.1 g: m.p. 121°-122° C.; NMR (d6DMSO) δ 8.14 (2H, d), 7.98 (2H, d), 7.02 (2H, d), 6.80 (2H, d), 4.99 (1H, m), 4.85 (2H, s), 3.84 (2H, s), 3.33 (4H, t), 2.62 (4H, t), 1.22 (6H, d); m/e 398 (M+H)+ ; calculated for C22H27N3O4 : C, 66.5; H, 6.9; N, 10.6. found: C, 65.8; H, 6.8; N, 10.4%.

Fuente