Annelation of the thiazole ring to 1,2,4-triazines by tandem AN—ANor SNH—SNHreactions
摘要:
The reactions of 3-aryl-1,2,4-triazines with aromatic thioamides and 4-arylthiosemicarbazides in acetic anhydride at room temperature afforded cyclic products of the tandem nucleophilic addition reactions, viz., tetrahydrothiazolo[4,5-e]-annelated 1,2,4-triazines, in good yields. The latter underwent aromatization in the presence of potassium permanganate.
Use of tandem AN-AN reactions for the synthesis of thiazolo[4,5-e]-1,2,4-triazines
摘要:
3-Aryl-1,2,4-triazines react with thioamides in acetic anhydride to produce thiazolo[4,5-e]-1,2,4-triazine derivatives and this reaction represents a new method for the fusion of thiazole and 1,2,4-triazine rings based on the nucleophilic ortho-diaddition type (A(N)-A(N)) cyclization reactions.