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

Abstract

Preparation of styryl derivatives of 2‐phenyl‐4 H ‐1,2,4‐triazolo [1,5‐ a ]pyridine 7‐Methyl‐2‐phenyl‐ and 2‐(3‐chloro‐4‐methylphenyl)‐4 H ‐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)‐4 H ‐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‐4 H ‐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.