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Synthesis of ring substituted 1,2,4-benzotriazine-di-N-oxides. Reagents and conditions: (a) Ac2O, TEA, DCM. (b) fHNO3, Ac2O, DCM. (c) HCl, reflux. (d) NCNH2, conc. HCl. (e) NaNO2, HCl. (f) tBuONO, tBuOH, H2O. (g) POCl3, reflux. (h) RNH2 (2 eq.), TEA (2 eq.), DCM, 18 h, rt. (i) TFAA, H2O2, THF, 4 d.
