反应详情

Triethylamine (4.66 g, 46.09 mmol) was added to a stirred suspension of methyl 3-bromo-2-bromomethylbenzoate (6.45 g, 20.95 mmol) and L-glutamine t-butyl ester hydrochloride (5.0 g, 20.95 mmol) in THF (100 mL). The mixture was heated to reflux for 18 hours. The mixture was cooled to room temperature and solvent was removed. The residue was dissolved in methylene chloride (100 mL) and washed with water (2×80 mL), brine (80 mL) and dried (MgSO4). Solvent was removed and the residue was purified by chromatography (CH2Cl2:CH3OH 97.5:2.5) to afford tert-butyl 2-(4-bromo-1-oxoisoindolin-2-yl)-4-carbamoylbutanoate (3.97 g, 48%): 1H NMR (CDCl3) δ 7.74 (d, J=7.1 Hz, 1H), 7.65 (d, J=7.9 Hz, 1H), 7.35 (t, J=7.8 Hz, 1H), 6.15 (s, 1H), 5.77 (s, 1H), 5.02–4.96 (m, 1H), 4.58 (d, J=17.4 Hz, 1H), 4.34 (d, J=17.4 Hz, 1H), 2.45–2.10 (m, 4H), 1.46 (s, 9H); 13C NMR (CDCl3) δ 173.83, 169.42, 168.74, 142.28, 134.70, 133.65, 129.80, 122.70, 117.75, 82.66, 54.29, 47.80, 32.27, 27.95, 25.54.

1. temperatureThe mixture was heated
2. temperatureto reflux for 18 hours
3. customsolvent was removed
4. dissolutionThe residue was dissolved in methylene chloride (100 mL)
5. washwashed with water (2×80 mL), brine (80 mL)
6. dry with materialdried (MgSO4)
7. customSolvent was removed
8. customthe residue was purified by chromatography (CH2Cl2:CH3OH 97.5:2.5)