Cl[C:2]1[CH:7]=[C:6]([C:8]2[CH:12]=[C:11]([NH2:13])[N:10]([CH3:14])[N:9]=2)[CH:5]=[CH:4][N:3]=1.[NH2:15][C:16]1NN=C(C2C=CN=C(NC)C=2)C=1>>[NH2:13][C:11]1[N:10]([CH3:14])[N:9]=[C:8]([C:6]2[CH:5]=[CH:4][N:3]=[C:2]([NH:15][CH3:16])[CH:7]=2)[CH:12]=1This title intermediate was prepared starting from 23.A (2.10 g, 10.0 mmol) according the procedure described above for conversion of 18.0 to 18.D. The crude product was purified by flash chromatography using 0-10% MeOH/CH2Cl2 for elution to provide 23.B as white solid (1.61 g, 79%).
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