Synthesis, crystal structure, herbicidal activities and 3D-QSAR study of some novel 1,2,4-triazolo[4,3-a ]pyridine derivatives

Abstract

It is possible that, with further structure modification, 1,2,4-triazolo[4,3-a]pyridine derivatives, which possess good herbicidal activities, may become novel lead compounds for the development of herbicides against dicotyledonous weeds.

Synthesis, Crystal Structure and DFT Studies of 8-chloro-3-((3-chlorobenzyl)thio)-[1,2,4]triazolo[4,3-a]pyridine

“…The starting material 3-chloro-2-hydrazinylpyridine was synthesized according to the method in our previous papers [14,15] [4,3-a]pyridin-3(2H)-thione occurred at the sulfur atom instead of the nitrogen atom, as expected for thiol. With regard to the mass spectra, the title compound showed an M-H signal.…”

“…Pyridine is another important nitrogen-containing heterocycle with various bioactivities [10][11][12][13]. Heterocycles which are obtained by the fusing of 1,2,4-triazole and pyridine ring show an obvious increase of biological activity [14,15]. For instance, 1,2,4-triazolo [4,3-a]pyridine derivatives possess outstanding biological activities, such as mGlu2 receptor PAM activity [16], antifungal activity [17], antibacterial activity [18], and so on.…”

Synthesis, Crystal Structure, DFT Study and Antifungal Activity of 4-(5-((4-Bromobenzyl) thio)-4-Phenyl-4H-1,2,4-Triazol-3-yl)pyridine

“…The 1,2,4-triazoles are considered an important nucleus that is associated with numerous biological activities, such as herbicidal [4][5][6], antifungal [7][8][9], antiviral [10], GHS-R1a ghrelin receptor [11], antimicrobial [12], anticancer [13], anticonvulsant [14], and antitubercular activities [15]. In addition, Diniconazole, Triadimefon, Triadimenol, Flusilazole, Fluconazole, Itraconazole, which have a 1,2,4-triazole moiety, appear to be very effective.…”

Crystal structure of 4-(5-((2-methylbenzyl)thio)-4-phenyl-4H-1,2,4-triazol-3-yl)pyridine, C21H18N4S

“…The 1,2,4-triazoles are often possessed excellent biological activities, such as herbicidal activity [4,5], antifungal activity [6,7].…”