反应详情

To a stirred suspension of 2-chloro-5-(chloromethyl)pyridine (2.0 g, 12 mmol) in acetonitrile (40 mL) was added potassium carbonate (1.5 mL, 25 mmol) followed by tert-butyl 1-piperazinecarboxylate (2.3 g, 12 mmol). The resulting mixture was stirred at room temperature for 20 h. Upon workup, the mixture was poured into ice and 2 N NaOH aqueous solution and extracted with ethyl acetate (2×). The combined organics were dried over Na2SO4 and concentrated in vacuo. The residue was subjected to combi-flash column chromatography (methanol/DCM) to give compound 339 (3.17 g, 82% yield) as a thick colorless liquid. 1H NMR 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 8.32 (1 H, d, J=2.0 Hz), 7.66 (1 H, d, J=7.4 Hz), 7.30 (1 H, d, J=8.2 Hz), 3.50 (2 H, s), 3.37-3.47 (4 H, m), 2.38 (4 H, br. s.), 1.46 (9 H, s). LCMS-ESI (POS), M/Z, M+1: Found 312.1.

1. extractionextracted with ethyl acetate (2×)
2. dry with materialThe combined organics were dried over Na2SO4
3. concentrationconcentrated in vacuo