Synthesis and Fungicidal Activity of Bioactive 4,4'-bis[4"-(N-Benzylidinylamine)-3"-mercapto-1",2",4"-triazole-5"-yl methoxy]dibenzyl
作者:Smriti Dwivedi、Pravin K. Singh
DOI:10.14233/ajchem.2017.20097
日期:——
The reaction of 4,4-diamino dibenzyl (I) with sodium nitrite and HCl at 0-5 °C followed by hydrolysis gave 4,4-dihydroxy dibenzyl (II), which on reaction with chloroacetic acid in presence of sodium carbonate yielded 4,4-ethylenebisphenoxyacetic acid (III). Nucleophilic substitution of compound III with hydrazine hydrate gave 4,4-bis(methoxycarbohydrazide)dibenzyl (IV) which on condensation with CS2 and KOH gave 44-bis-[(3"-mercapto-1",2",4"-oxadiazole-5"-yl)methoxy]dibenzyl (V). Compound V further condensed with hydrazine hydrate and yielded 4’4-bis[4"-amino-3"-mercapto-1",2",4"-triazole-5"yl methoxy]dibenzyl (VI). It on condensation with different carbonyl compounds gave 4,4’-bis[4"-(N-benzylidinylamine)-3"-mercapto-1",2",4"-triazole-5"yl methoxy]dibenzyl (VIIa-h). Compounds (VIIa-h) were evaluated in vitro for their fungi toxicities against Aspergillus niger and Fusarium oxysporum.
4,4-二氨基二苯乙烯(I)与亚硝酸钠和盐酸在0-5℃下反应,随后水解得到4,4-二羟基二苯乙烯(II),该化合物与氯乙酸在碳酸钠存在下反应生成4,4-乙烯双苯氧乙酸(III)。化合物III与水合肼进行亲核取代反应,得到4,4-双(甲氧基羟肟酸)二苯乙烯(IV),IV与硫化碳和氢氧化钾缩合生成4,4-双-[(3"-巯基-1",2",4"-噁二唑-5"-基)甲氧基]二苯乙烯(V)。化合物V进一步与水合肼缩合,得到4’4-双[4"-氨基-3"-巯基-1",2",4"-三唑-5"-基甲氧基]二苯乙烯(VI)。它与不同的羰基化合物缩合生成4,4’-双[4"-(N-苯甲亚胺基)-3"-巯基-1",2",4"-三唑-5"-基甲氧基]二苯乙烯(VIIa-h)。化合物(VIIa-h)在体外评估其对黑曲霉和根腐霉的真菌毒性。