反应详情

A solution of 3-chloro-2-(bromoacetamido)benzoic acid from Example 39 (7.5 g, 0.026 mol), aniline (5.8 mL, 250 mol %) and anhydrous DMF (60 mL) was heated at 95°-100° C. for 20h, cooled and stirred at rt for 4h. The reaction mixture was poured into ice-water (400 mL) and the precipitated product was solubilized by adding aqueous 5% KOH (60 mL). The resulting milky homogenous solution was extracted with CH2Cl2 (3×70 mL). The combined CH2Cl2 extracts were set aside and the aqueous layer was acidified to pH=3 with aqueous 5% HBr. The resulting oil was extracted into EtOAc (3×100 mL) and the combined extract was washed with brine, dried, filtered and concentrated. Recrystallization of the resulting solid from diethyl ether afforded 3 g (38%) of the title compound as a white crystals, mp 184°-185° C.; 1H NMR (CD3OD) δ 7.85 (dd, 1H, J=1.6, J=6), 7.66 (dd, 1H, J=1.6, J=6.4), 7.33 (t, 1H, J=8), 7.16 (t, 2H, J=7.2), 6.72 (dd, 3H, J=2, J=5.6), 3.91 (s, 2H); 13C NMR (CD3OD): 203.86, 196.95, 173.19, 173.17, 168.69, 149.44, 134.30, 130.41, 130.09, 128.42, 119.31, 114.44; MS (EI, m/z) 304 (M+).

1. temperaturecooled
2. extractionThe resulting milky homogenous solution was extracted with CH2Cl2 (3×70 mL)
3. extractionThe resulting oil was extracted into EtOAc (3×100 mL)
4. extractionthe combined extract
5. washwas washed with brine
6. customdried
7. filtrationfiltered
8. concentrationconcentrated
9. customRecrystallization of the resulting solid from diethyl ether