Hashime Kanazawa, Sadao Nishigaki, Keitaro Senga N-Bromosuccinimide in Heterocyclic Synthesis. Synthesis of Pyrazolo[3,4-d]pyrimidines, Pyrimido[5,4-e]-as-triazines, and Pyrimido[4,5-c]pyridazines from 6-Arylidenehydrazino-1,3-dimethyluracil Derivatives Journal of Heterocyclic Chemistry 1984, Volume 21, pp. 969-974
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http://dx.doi.org/10.1002/jhet.1984.5570210408