The Mannich reaction of 3-(substituted)-4-(1-phenyl-3-methyl-5-chloro-4-pyr
azolidine)amino-5-mercapto-1, 2, 4-triazoles 3 with formaldehyde and approp
riate amine results in the regioselective formation of 1-aminomethyl-3- (su
bstituted)-4-(1-phenyl-3-methyl-5-chloro-4-pyrazolidine)amino- 1, 2, 4-tria
zole-5-thiones 4. The structures of new compounds have been established by
analytical and spectral data These compounds have been tested for their ant
ifungal and antibacterial activities.