反应详情

2-(1-(2-hydroxyethyl)-2,6-dioxopiperidin-3-yl)isoindolin-1,3-dione (S)-2-(tert-butoxycarbonylamino)-3-methylbutanoate (410 mg) was dissolved in 30% TFA/DCM (5 mL), the mixture was stirred on a magnetic stirrer for 4 hrs at room temperature. White foam was obtained after reduced pressure distillation to distill off the solvent. The foam was dissolved in DCM (30 mL). The resultant solution washed with aqueous saturated sodium bicarbonate solution and brine (30 mL), dried over anhydrous magnesium sulfate, and filtered. Title compound was obtained as a white solid (260 mg) after rotary evaporation. 1H NMR (CDCl3, ppm) δ 7.87-7.91 (m, 2H), 7.76-7.79 (m, 2H), 4.97-5.08 (m, 1H), 4.38-4.43 (m, 1H), 4.05-4.30 (m, 3H), 3.25 (dd, 1H, J=4.8, 13.2 Hz), 2.95-3.05 (m, 1H), 2.80-2.95 (m, 2H), 2.10-2.20 (m, 1H), 1.90-2.10 (m, 2H), 1.00-1.20 (m, 1H), 0.95-0.98 (m, 3H), 0.87-0.91 (m, 3H). MS (m/e): 402 (M+H+).

1. customWhite foam was obtained
2. distillationafter reduced pressure distillation
3. distillationto distill off the solvent
4. dissolutionThe foam was dissolved in DCM (30 mL)
5. washThe resultant solution washed with aqueous saturated sodium bicarbonate solution and brine (30 mL)
6. dry with materialdried over anhydrous magnesium sulfate
7. filtrationfiltered