反应详情

温度

70 °C

To a solution of benzyl ((2S,3S)-1-(2,4-dimethoxybenzyl)-2-((R)-2,2-dimethyl-1,3-dioxolan-4-yl)-4-oxoazetidin-3-yl)carbamate (267 g, 0.567 mol) in THF (3 L) was added a solution of TsOH.H2O (43.6 g, 0.229 mol) in water (0.75 L). The bilayer was heated to 70° C. for 16 h then cooled to rt, neutralized to pH=7 with saturated NaHCO3 (aq) and concentrated in vacuo. The resulting mixture was filtered, washed with water and dried to afford the title compound (240 g, 98%) as a pale yellow solid. LCMS: m/z=431.1 (M+1).

1. temperaturethen cooled to rt
2. concentrationconcentrated in vacuo
3. filtrationThe resulting mixture was filtered
4. washwashed with water
5. customdried