反应详情

To a mixture of piperidin-4-one HCl salt (4.08 g, 30 mmol) and Et3N (20 mL, 78.6 mmol) in EtOH (50 mL) was added 5-chloro-3-methyl-1,2,4-thiadiazole (4.05 g, 30 mmol). The mixture was heated to reflux for 1.5 hours and then concentrated to dryness. The residue was dissolved in EtOAc. The solution was washed with water (30 mL×3) and brine (30 mL), dried over Na2SO4, and concentrated to dryness. The residue was recrystalled from ether to give 1-(3-methyl-1,2,4-thiadiazol-5-yl)piperidin-4-one (510 mg, 8.6%). 1H-NMR (300 MHz, CDCl3) δ 3.86 (t, J=6.3 Hz, 4H), 2.62 (t, J=6.3, Hz, 4H), 2.44 (s, 3H).

1. temperatureThe mixture was heated
2. temperatureto reflux for 1.5 hours
3. concentrationconcentrated to dryness
4. dissolutionThe residue was dissolved in EtOAc
5. washThe solution was washed with water (30 mL×3) and brine (30 mL)
6. dry with materialdried over Na2SO4
7. concentrationconcentrated to dryness