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

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Reaction Steps

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 positioned 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/0.880 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) δ8.14(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%.

Provenance & Evidence