The scope of functionalization of 1,2,4-triazines can be considerably extended via successive nucleophilic substitution of hydrogen (S-N(H)) and ipso-substitution. A convenient procedure has been developed for direct cyanation of 1,2,4-triazine 4-oxides with acetone cyanohydrin in the presence of triethylamine. The cyano group in the resulting 5-cyano-1,2,4-triazines is readily replaced by reactions with various aliphatic alcohols and amines.
The amidine rearrangement in 5-amino-6-aryl-1,2,4-triazine-4-oxides initiated by hydroxylamine
作者:Oleg N Chupakhin、Valery N Kozhevnikov、Anton M Prokhorov、Dmitry N Kozhevnikov、Vladimir L Rusinov
DOI:10.1016/s0040-4039(00)01245-4
日期:2000.9
Addition of hydroxylamine at the 3 position of 6-aryl-5-amino-1,2,4-triazine-4-oxides initiates the amidine rearrangement resulting in 6-aryl-5-hydroxylamine-1,2,4-triazines, as confirmed by an experiment with N-15-labeling. (C) 2000 Published by Elsevier Science Ltd.