Ethyl Acetate → 3-bromo-5-fluoro-1-trityl-1H-pyrazolo[3,4-b]pyridine

Reaction equation

[Br:1][C:2]1[C:10]2[C:5](=[N:6][CH:7]=[C:8]([F:11])[CH:9]=2)[NH:4][N:3]=1.C([O-])([O-])=O.[K+].[K+].Cl[C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][C:20]=1[CH:25]([C:32]1[CH:37]=[CH:36][CH:35]=[CH:34][CH:33]=1)[C:26]1[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=1.C(OCC)(=O)C>CN(C=O)C.O>[Br:1][C:2]1[C:10]2[C:5](=[N:6][CH:7]=[C:8]([F:11])[CH:9]=2)[N:4]([C:25]([C:20]2[CH:21]=[CH:22][CH:23]=[CH:24][CH:19]=2)([C:32]2[CH:33]=[CH:34][CH:35]=[CH:36][CH:37]=2)[C:26]2[CH:27]=[CH:28][CH:29]=[CH:30][CH:31]=2)[N:3]=1