[NH2:1][C:2]1[N:10]=[C:9]([Cl:11])[CH:8]=[CH:7][C:3]=1[C:4](O)=[O:5].C1C=CC2N(O)N=[N:18]C=2C=1.CCN=C=NCCCN(C)C.C(N(CC)CC)C.[NH4+].[Cl-]>CN(C=O)C>[NH2:1][C:2]1[N:10]=[C:9]([Cl:11])[CH:8]=[CH:7][C:3]=1[C:4]([NH2:18])=[O:5]To a solution of 2-amino-6-chloronicotinic acid (1.0 g, 5.79 mmol), HOBT (932 mg, 6.95 mmol) and EDCI (2.22 g, 11.6 mmol) in 15 mL of DMF was added triethylamine (5.86 g, 57.9 mmol) and NH4Cl (1.55 g, 28.9 mmol). Then the mixture was stirred at room temperature for 16 h. The solution was concentrated in vacuo to remove DMF and the residue was suspended in saturated NaHCO3 Finally the 2-amino-6-chloronicotinamide (800 mg, yield: 81%) was obtained by filtration without further purification. 1H-NMR (DMSO-d6, 400 MHz) δ 7.95 (d, J=8.4 Hz, 1H), 7.62 (s, 2H), 7.39 (s, 2H), 6.59 (d, J=8.4 Hz, 1H). MS (M+H)+: 172/174.
読み込み中…
