反应详情

A solution of 4-iodo-2-nitrobenzoic acid (0.35 g, 1.20 mmol) dissolved in SOCl2 (5 mL) was heated at reflux for 2 h. The mixture was concentrated and the resulting liquid was dissolved in DMF (5 mL). DMAP (161 mg, 1.32 mmol) and 2-amino-3-(3,4-dichloro-phenyl)-propionic acid methyl ester hydrochloride (0.37 g, 1.32 mmol) were added and the solution was stirred overnight at rt. The mixture was poured into water and extracted with EtOAc (3×). The organic layers were combined, dried (MgSO4), and concentrated to provide the crude product as a yellow oil. The oil was purified by flash chromatography (hexanes/EtOAc) to provide the product as a colorless oil (50%, 313 mg). 1H NMR (400 MHz, CDCl3): 7.59 (d, J=8.1, 2H), 7.37 (d, J=8.2, 1H), 7.28 (d, J=2.0, 1H), 7.18 (d, J=8.0, 1H), 7.04 (dd, J=8.2, 2.0, 1H), 6.49 (d, J=7.4, 1H), 5.10-5.04 (m, 1H), 3.81 (s, 3H), 3.33-3.17 (m, 2H).

1. temperaturewas heated
2. temperatureat reflux for 2 h
3. concentrationThe mixture was concentrated
4. dissolutionthe resulting liquid was dissolved in DMF (5 mL)
5. extractionextracted with EtOAc (3×)
6. dry with materialdried (MgSO4)
7. concentrationconcentrated
8. customto provide the crude product as a yellow oil
9. customThe oil was purified by flash chromatography (hexanes/EtOAc)