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Beilstein J. Org. Chem. 2006, 2, No. 5, doi:10.1186/1860-5397-2-5
Graphical Abstract
Scheme 1: Mechanism for the formation of Pyrimido [4,4-c][1,2]diazepines.
Scheme 2: Reagents and conditions: i) EtOH, reflux.
Scheme 3: Reagents and conditions: i) EtOH, reflux.
Scheme 4: Mechanism for the formation of Pyrazolo [3,4-d]pyrimidines.