Record number :
1083569
Title of article :
Regioselectivity in 1,5-electrocyclization of N-[as-triazin-3-yl]nitrilimines. Synthesis of s-triazolo[4,3-b]-as-triazin-7(8H)-ones
Author/Authors :
Ahmad Sami Shawali، نويسنده , , Sobhi M Gomha، نويسنده ,
Issue Information :
هفته نامه با شماره پیاپی سال 2002
Pages :
6
From page :
8559
To page :
8564
Abstract :
6-Benzyl-3-(arylmethylidenehydrazino)-as-triazin-5(4H)-ones 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 in overall good yields. The regioselectivity in the studied reactions was elucidated by comparison of 13C NMR spectra of and their methyl derivatives with those of their regioisomers prepared by independent methods.
Keywords :
electrocyclization , Synthetic methods , hydrazones , Heterocycles
Journal title :
Tetrahedron
Serial Year :
2002
Link To Document :
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