1-(4-Pyridyl)piperazine → Methyl 4-[3-[4-(4-pyridyl)piperazin-1-yl]-2-methylpropanoyl]phenoxyacetate

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A stirred mixture of methyl 4-(2,2-dimethylbromoacetyl)phenoxyacetate (3.15 g), and 1-(4-pyridyl)piperazine (3.26 g) in acetonitrile (200 ml) was heated at reflux temperature for 4 days. The solvent was removed in vacuo and the residue partioned between dichloromethane/water. The organic phase was dried (MgSO4), evaporated and then purified by flash chromatography on silicon, eluting with 2 to 5% v/v methanol/dichloromethane. Further purification by flash chromatography on neutral alumina, eluting with dichloromethane, gave the title compound, 350 mg, as a clear oil: NMR (d6DMSO) δ8.12(2H,d), 7.98(2H,d), 7.04(2H,d), 6.75(2H,d), 4.92(2H,s), 3.86(1H,m), 3.71(3H,s), 3.19(4H,t), 2.70(1H,q), 2.49(DMSO+4H), 2.36(1H,q), 1.09(3H,s), trace of dichloromethane; m/e 398 (M+H)+ ; calculated for C22H27 N3O4 0.1 CH2Cl2 : C, 65.3; H, 6.7; N, 10.3. found: C, 65.1; H, 6.9; N, 10.1%.

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