501006-99-1Relevant academic research and scientific papers
Regioselectivity in 1,5-electrocyclization of N-[as-triazin-3-yl]nitrilimines. Synthesis of s-triazolo[4,3-b]-as-triazin-7(8H)-ones
Shawali, Ahmad Sami,Gomha, Sobhi M
, p. 8559 - 8564 (2007/10/03)
6-Benzyl-3-(arylmethylidenehydrazino)-as-triazin-5(4H)-ones 4 underwent regioselective cyclization upon treatment with either bromine in acetic acid containing sodium acetate or with ferric chloride in refluxing ethanol to give the respective s-triazolo[4,3-b]-as-triazin-7(8H)-ones 7 in overall good yields. The regioselectivity in the studied reactions was elucidated by comparison of 13C NMR spectra of 7 and their methyl derivatives with those of their regioisomers prepared by independent methods.
