One-Pot Preparation Method of 5-Alkyl-3-(benzo)pyridyl-1,2,4-triazines

Abstract

Convenient one-pot method was developed for the preparation of 5-alkyl-3-(2-pyridyl)-, 5-alkyl-3-(4-pyridyl)- or 5-alkyl-3-(quinolin-2-yl)-1,2,4-triazines in up to 92% yield by condensation of hydrazones of isonitrosopropiophenone, isonitrosobutyrophenone, and isonitrosovalerophenone with aldehydes of (benzo) pyridine series with subsequent aromatization in boiling acetic acid.