12. Anil‐Synthese. 17. Mitteilung. Über die Herstellung von styryl‐derivaten des 2‐phenyl‐4H‐1,2,4‐triazolo [1,5‐a]pyridins

Abstract

Preparation of styryl derivatives of 2‐phenyl‐4H‐1,2,4‐triazolo [1,5‐a]pyridine7‐Methyl‐2‐phenyl‐ and 2‐(3‐chloro‐4‐methylphenyl)‐4H‐1,2,4‐triazolo[1,5‐a]‐pyridines react with anils of aromatic aldehydes in the presence of dimethyl‐formamide and potassium hydroxide at 20–45° to yield the 2‐phenyl‐7‐styryl‐ and 2‐(2‐chloro‐stilben‐4‐yl)‐4H‐1,2,4‐triazolo [1,5‐a]pyridines respectively (‘Anil Synthesis’). Further, the Schiff's bases derived from o‐chloroaniline and 2‐(p‐formyl‐phenyl)‐ and 7‐formyl‐2‐phenyl‐4H‐1,2,4‐triazolo [1,5‐a]pyridine yield, with methyl‐ and with p‐tolyl‐substituted heterocycles, the corresponding heterocyclic substituted styryl and stilbenyl derivatives.