Synthesis and biological activity of substituted 6-alkyl(6H)-3-phenyl-1,2,4-triazolo[3,4-b]-1,3,4-thiadiazines

A series of substituted 6-alkyl(6H)-3-phenyl-1,2,4-triazolo[3,4-b]-1,3,4-thiadiazines have been synthesized by reaction of 3-alkyl-4-amino-5-thio-1,2,4-triazoles with substituted phenacylbromides in the presence of an equimolar amount of KOH. Mass spectra for the dissociative ionization by electron impact, antibacterial activity, and antitumor properties of the synthesized compounds have been studied. It was established that some compounds at doses of 50 – 100 mg/kg decrease the growth of sarcomas 45 and 37 by 35 – 47%.