A New Family of Fused Azolo[1,5‑ a ]pteridinesand Azolo[5,1‑ b ]purines

The nitration of azolo[1,5-a]pyrimidin-7-amines with several nitration agents (such as acetic nitric anhydride, nitronium tetrafluoroborate, and a mixture of concentrated nitric acid and sulfuric a...