Heterocyclic studies. Part XXIII. 5-Trifluoromethylpyrimido[5,4-e]-as-triazines
Abstract
Syntheses of several 7-substituted 5-trifluoromethylpyrimido[5,4-e]-as-triazines and 1,2-dihydro-derivatives are described. The heteroaromatic compounds were usually unstable in acidic solution and each was completely covalently hydrated across the 5,6-bond at equilibrium in aqueous solution at all pH values.