Abstract
AbstractRecently, we reported that appropriately substituted 2‐fluorobenzonitriles undergo cyclization with guanidine carbonate to afford 2,4‐diaminoquinazolines usually in good to excellent yield. This paper describes the preparation of a variety of new 2,4‐diaminoquinazolines substituted at positions five or seven. In addition, the reactions of selected 2‐fluorobenzonitriles with formamidine acetate or acetamidine acetate were examined. The results obtained demonstrate that the analogous 4‐amino‐ and 2‐methyl‐4‐aminoquinazolines can be prepared by this approach but that the yields are considerably lower than when guanidine carbonate is employed as the cyclization reagent.
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