反应详情

温度

0 °C

To a stirred mixture of 1-pyridin-2-ylimidazolidin-2-one from Step A (150 mg, 0.92 mmol) and tert-butyl bromoacetate (197 mg, 1.01 mmol) in DMF (2 mL) at 0° C. was added sodium hydride (40 mg of a 60% dispersion in mineral oil, 1.00 mmol). The mixture was stirred at 0° C. for 30 min, then quenched with saturated aqueous NaHCO3 and extracted with CHCl3 (2×35 mL). The combined organic layers were dried over Na2SO4, filtered, and concentrated under reduced pressure. The crude product was purified by silica gel chromatography, eluting with a gradient of hexane:EtOAc—100:0 to 70:30, to give the title compound. MS: m/z=278 (M+1).

1. customquenched with saturated aqueous NaHCO3
2. extractionextracted with CHCl3 (2×35 mL)
3. dry with materialThe combined organic layers were dried over Na2SO4
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure
6. customThe crude product was purified by silica gel chromatography
7. washeluting with a gradient of hexane