反应详情

温度

40 °C

To a suspension of 3-amino-4-(2-methylpiperidin-1-yl)benzoic acid obtained in step 2 (100 mg; 0.43 mmol) in pyridine (69.04 μL, 0.85 mmol) and DCM (4 mL), was added acetyl chloride (36.42 μL; 0.51 mmol). The reaction mixture was then stirred at 40° C. for 5 h after which solvents were evaporated under vacuum, solid residue was triturated with ethylacetate and re-evaporated. Finally, water was added to the reaction mixture which was sonicated, filtered, dried under vacuum to give the title compound as a white solid (95 mg, 81%). 1H NMR (DMSO-d6, 300 MHz) δ 12.76 (bs, 1H), 8.97 (s, 1H), 8.66 (s, 1H), 7.64 (dd, J=8.2, 2.1 Hz, 1H), 7.29 (d, J=8.2 Hz, 1H), 3.07-3.01 (m, 1H), 2.86-2.82 (m, 1H), 2.57-2.51 (m, 1H), 2.15 (s, 3H), 1.82-1.77 (m, 4H), 1.47-1.42 (m, 2H), 0.78 (d, J=6 Hz, 3H). LC/MS (Method B): 277.2 (M+H)+. HPLC (Method A) Rt 1.77 min (purity: 91.3%).

1. customwere evaporated under vacuum, solid residue
2. customwas triturated with ethylacetate
3. customre-evaporated
4. additionFinally, water was added to the reaction mixture which
5. customwas sonicated
6. filtrationfiltered
7. customdried under vacuum