Isatin (indole 2,3-dione) and its 5-chloro and 5-bromo derivatives have been reacted with 3-(4'-pyridyl)-4-amino-5-mercapto-4-(H)-1,2,4-triazole to form Schiff bases and the N-Mannich bases of these compounds were synthesised by reacting them with formaldehyde and several secondary amines. Their chemical structures have been confirmed by means of their IR, 1H-NMR data and by elemental analysis. Investigation of antimicrobial activity of compounds was done by agar dilution method against 27 pathogenic bacteria, 8 pathogenic fungi and anti-HIV activity against replication of HIV-1 (III B) in MT-4 cells. Among the compounds tested 1-(piperidinomethyl) 5-bromo 3-[3'-(4"-pyridyl)-5'-mercapto-4'-(H)-1',2',4'-triazol 4'-yl]imino isatin showed the most favourable antimicrobial activity.

JOURNAL ARTICLE Anti-HIV Agents/*CHEMICAL SYNTHESIS/PHARMACOLOGY Anti-Infective Agents/*CHEMICAL SYNTHESIS/PHARMACOLOGY Antifungal Agents/*CHEMICAL SYNTHESIS/PHARMACOLOGY Bacteria/DRUG EFFECTS Cell Line Fungi/DRUG EFFECTS Isatin/*ANALOGS & DERIVATIVES/CHEMICAL SYNTHESIS/*PHARMACOLOGY Mannich Bases/CHEMICAL SYNTHESIS/*PHARMACOLOGY Microbial Sensitivity Tests Nuclear Magnetic Resonance Schiff Bases/CHEMICAL SYNTHESIS/*PHARMACOLOGY Spectrophotometry, Infrared Triazoles/*CHEMICAL SYNTHESIS/PHARMACOLOGY

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