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This review summarizes results from a literature survey concerning the synthesis and reactions of 4-amino-3-mercapto-1,2,4-triazine-5-ones reported by research groups from 1983 to mid. 2015.

4‐(Thiazol‐2‐yldiazenyl)‐1H‐pyrazole‐3,5‐diamine (2) was prepared by the reaction of 2‐thiazolylazomalononitrile (1) with hydrazine hydrate in boiling ethanol and used as key intermediate for the synthesis of polyfunctionally substituted pyrazolo[1,5‐a]pyrimidines via its reactions with reagents having 1,3‐dielectrophilic centers. Structures of the newly synthesized compounds were established by elemental analysis and spectral data. Representative compounds of the synthesized products were tested and evaluated as antioxidant agents. The results revealed that compounds (3), (4), (5), and (9) displayed promising antioxidant activity compared to the activity of ascorbic acid.

Abstract2‐Methyl‐benzo[d][1,3]oxazin‐4‐one (1) was used as a key intermediate for the synthesis of different benzoxazinone and quinazolinone derivatives. In order to evaluate the applicability of the synthesised benzoxazinones and quinazolinones as antioxidant additives for lube oil, these antioxidant additives decomposed the alkyl peroxide radicals and/or alkyl hydrogen peroxides to produce esters, ketone and hydroxy compounds rather than carboxylic acids. The compounds that showed antioxidant efficiency were tested as corrosion inhibitors using three types of metals: Cu, Al and Fe. Copyright © 2011 John Wiley & Sons, Ltd.

The chemical reactivity of 4‐amino‐6‐benzyl‐3‐mercapto‐1,2,4‐triazine‐5(4H)‐one (1) towards various aliphatic or/and mono and bis aromatic carboxylic acid derivatives to give the corresponding fused heterocyclic systems, 1,3,4‐thiadiazoles 4, 5, 6, which incorporating 1,2,4‐triazine nucleus was achieved. Moreover, compound 1 was subjected to react either with halo acetic acids or bromo ester to afford the respective fused nitrogen ring junction systems, thiadiazole 2 and 3, or thiadiazine 7. However, the tetracyclic ring system 9 was furnished through condensation reaction of isatine with triazine 1. In addition, some of the new synthesized compounds were evaluated as an antioxidant and antitumor agents.