反应详情

To a solution of 2-chloro-5-(chloromethyl)pyridine 1-oxide (222 mg, 1.25 mmol; described in: Tilley, J. W. et al, J. Heterocyclic Chem. 1979, 16, 333) in tetrahydrofuran (2 mL) were added a solution of 4-methylpiperidine (247 mg, 2.49 mmol) in tetrahydrofuran (1.5 mL), a catalytic amount of potassium iodide, and MP-Carbonate (2.55 mmol/g, 1.47 g, 3.74 mmol). The mixture was gently stirred at room temperature for one week. The mixture was filtered (20 μm polyethylene filter), and the beads were washed with several portions of methylene chloride. The filtrate was washed with NaHCO3 (aq. sat.), dried (Na2SO4), and the solvent was evaporated to give a crude product which was purified by column chromatography using chloroform/ethanol, (95:5), as the eluent to give 168 mg (56% yield) of the title compound as a yellow oil: 1H NMR (CDCl3, 400 MHz) δ 8.37 (d, J=1 Hz, 1 H), 7.41 (d, J=8 Hz, 1 H), 7.20 (dd, J=8, 2 Hz, 1 H), 3.41 (s, 2 H), 2.80-2.75 (m, 2 H), 2.00 (dt, J=12, 2 Hz, 2 H), 1.63-1.58 (m, 2 H), 1.45-1.30 (m, 1 H), 1.22 (m, 2 H), 0.92 (d, J=6 Hz, 3 H); MS (ES) m/z 241 (M++1).

1. filtrationThe mixture was filtered
2. filtration(20 μm polyethylene filter)
3. washthe beads were washed with several portions of methylene chloride
4. washThe filtrate was washed with NaHCO3 (aq. sat.)
5. dry with materialdried (Na2SO4)
6. customthe solvent was evaporated
7. customto give a crude product which
8. customwas purified by column chromatography