2-Methyloxazolo[4,5-b]phenazine (2) was obtained through the cyclocondensation of 3-aminophenazin-2-ol (1) with acetic anhydride.Oxazolophenazine derivatives (3a-d) were synthesized by oxidatively adding 3-aminophenazin-2-ol (1) to aromatic aldehydes.The addition of 3-aminophenazin-2-ol (1) to activated acrolein resulted in the formation of the 2-methylene-2H-[1,4]oxazino[2,3-b]phenazine (5).Alkyl...