反应详情

2-chloro-3-(3,6-dihydro-2H-pyran-4-yl)-pyridine (see PREPARATION P13.1; 3.5 g, 17.9 mmol) and tert-butyl 3-hydroxyazetidine-1-carboxylate (2.8 g, 17.9 mmol) were dissolved in DMSO (20 mL) and sodium tert-butoxide (t-BuONa) (3.4 g, 35.8 mmol) was added to the above solution. The reaction mixture was stirred at room temperature for overnight. The reaction mixture was diluted with water and extracted with ethyl acetate (2×10 mL). The combined organic layers were dried over Na2SO4 and concentrated to give the crude product. The crud product was purified by silica gel column chromatography to give the title compound (2.3 g, 7.8 mmol, yield 75%). 1H NMR (DMSO-D6, 300 MHz) δ (ppm) 1.38 (s, 9H), 2.41-2.47 (m, 2H), 3.75-3.86 (m, 4H), 4.19-4.30 (m, 4H), 5.26-5.35 (m, 1H), 6.15-6.20 (m, 1H), 7.01 (dd, 1H, J=7.31 Hz, 4.97 Hz), 7.62 (d, 1H, J=7.45 Hz), 8.02 (d, 1H, J=4.82 Hz)

1. extractionextracted with ethyl acetate (2×10 mL)
2. dry with materialThe combined organic layers were dried over Na2SO4
3. concentrationconcentrated
4. customto give the crude product
5. customThe crud product was purified by silica gel column chromatography