Synthesis of Benzothiazinophenothiazine Derivatives and their Antimicrobial Screening
作者:Emmanuel O Adekola、Benjamin E Ezema、Jude I Ayogu、David I Ugwu、Chidimma G Ezema、Abuekwu P Nwasi、Christian O Ike
DOI:10.13005/ojc/300406
日期:2014.12.31
The synthesis of benzothiazinophenothiazine derivatives from simple heterocyclic compounds was thoroughly investigated. The intermediate, 6-chloro-5H-benzo[a]phenothiazin-5-one was afforded by the condensation of 2-aminothiophenol with 2,3-dichloro-1, 4-naphthoquinone in an alkaline medium. Further condensation of the intermediate with 2,4-diamino-6-hydroxypyrimidine-5-thiol obtained by alkaline hydrolysis of 2,4-diamino-6-hydroxy-5-thiacyanatopyrimidine gave 7-amino-9-hydroxy-6-8,diazabenzo[a][1,4]benzothiazino[3,2-c]phenothiazine. However, facile acid-catalyzed synthesis of four other benzothiazinophenothiazine ring systems was accomplished with improved yield and lesser reaction time. The Structural confirmation was done using UV-Visible spectroscopy, FT-IR, 1H and 13C-NMR and elemental analysis. The synthesized compounds were screened against some micro-organisms and the results showed that the complex derivatives were significantly active against the microorganisms.
合成苯硫噻嗪苯噻嗪衍生物的研究从简单的杂环化合物入手,进行了深入探讨。中间体6-氯-5H-苯并[a]噻嗪-5-酮是通过将2-氨基硫酚与2,3-二氯-1,4-萘醌在碱性介质中缩合得到的。进一步将该中间体与通过碱水解2,4-二氨基-6-羟基-5-硫氰基嘧啶得到的2,4-二氨基-6-羟基-5-硫噻唑缩合,得到7-氨基-9-羟基-6-8-二氮苯并[a][1,4]苯硫噻嗪[3,2-c]苯噻嗪。然而,采用酸催化法成功实现了其他四种苯硫噻嗪环系的合成,且产率较高,反应时间较短。利用紫外-可见光谱、傅里叶变换红外光谱、氢核磁共振谱(1H NMR)、碳核磁共振谱(13C NMR)和元素分析进行了结构确认。合成的化合物对一些微生物进行了筛选,结果显示这些复合衍生物对微生物具有显著的活性。