Br[CH2:2][C:3]1[N:7]([CH3:8])[N:6]=[C:5]([CH2:9][CH3:10])[CH:4]=1.[NH3:11].O>>[CH2:9]([C:5]1[CH:4]=[C:3]([CH2:2][NH2:11])[N:7]([CH3:8])[N:6]=1)[CH3:10]A solution of compound 5 (660 mg, 3.27 mmol) in NH3.H2O (5 mL) was stirred at 90° C. for 3 h. The solvent was evaporated to give the crude product as a white solid which was used in the next step without further purification.
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