Reacción #2339

Ecuación de reacción

4-[4-(4-pyridyl)piperazin-1-yl]phenol

sodium hydride

ethyl-4-bromo-3-methylbutyrate

→

ethyl 3-methyl-4-[4-[4-(4-pyridyl)piperazin-1-yl]phenoxy]butyrate

Disolventes

DMF

Condiciones de reacción

Tratamiento posterior

1. 1
   workup.STIRRINGthe mixture stirred for 16 hours
2. 2
   OtroSolvent was evaporated
3. 3
   Otrothe residue partitioned between water and dichloromethane
4. 4
   OtroInsoluble material was removed by centrifugation
5. 5
   FiltraciónThe organic layer was filtered through phase
6. 6
   Otroseparating paper (Whatman IPS)
7. 7
   Otrothe residue was purified by flash chromatography on silica gel by elution with methanol/dichloromethane/concentrated ammonia (50/950/5)

Procedimiento

To a stirred suspension of 4-[4-(4-pyridyl)piperazin-1-yl]phenol (1.02 g) in dry DMF (10 ml) was added sodium hydride (60% dispersion in mineral oil, 0.16 g) and the mixture stirred for 1 hour at room temperature. To the resulting solution was added ethyl-4-bromo-3-methylbutyrate and the mixture stirred for 16 hours. Solvent was evaporated and the residue partitioned between water and dichloromethane. Insoluble material was removed by centrifugation. The organic layer was filtered through phase separating paper (Whatman IPS) and the residue was purified by flash chromatography on silica gel by elution with methanol/dichloromethane/concentrated ammonia (50/950/5) to give ethyl 3-methyl-4-[4-[4-(4-pyridyl)piperazin-1-yl]phenoxy]butyrate (0.27 g) which was hydrolysed in methanol (3 ml) and aqueous sodium hydroxide (1N, 2 ml) for 2 hours at room temperature. The solution was evaporated and the residue purified by reverse phase h.p.l.c (water/acetonitrile/0.1% TFA gradient) to give a glass which crystallised on trituration with ether to give the title compound (0.08 g): m.p. 169°-171° C.; NMR(d6DMSO) δ 13.45(1H,broad), 2.07(1H,broad) 8.27(2H,d), 7.28(2H,d), 6.9(4H,m), 3.80(6H,m), 3.16(4H,t), 2.45(1H,m), 2.37(1H,m), 2.12(1H,m), 1.0(3H,d); m/e 356(M+H)+ ; calculated for C22 H25N3O4F3. 0.5 H2O: C, 55.2; H, 5.6; N, 8.9. Found: C, 55.3; H, 5.6; N, 8.7%.

Fuente