Synthesis and Antimicrobial Screening of Novel Benzoxazinophenothiazine Derivatives
作者:C.O. Ike、B.E. Ezema、J.I. Ayogu、D.I. Ugwu、C.G. Ezema C.G. Ezema、A.P. Nwasi、E.O. Adekola E.O. Adekola
DOI:10.14233/ajchem.2015.19110
日期:——
The acid catalyzed synthesis of benzoxazinophenothiazine derivatives is reported. The intermediates 6-chloro-5H-benzo[a]phenothiazin-5-one (1), 11-amino-6-chloro-9-thio-8,10-diazabenzo[a]phenoxazin-5-one (2) and 6,8-dichlorobenzo[a]phenoxazine-5-one (3) were prepared by the condensation of 2,3-dichloro-1,4-naphthoquinone with 2-aminothiophenol, 4,5-diamino-6-hydroxypyrimidin-2-thiol and 2-amino-6-chlorophenol respectively in an alkaline medium. Further alkaline condensation of the intermediates, 1 and 2 each with 4-aminothiophenol yielded 14-nitrobenzo[a][1,4]benzoxazino[3,2-c]phenothiazine and 15-amino-13-thio-12,14-diazabenzo[a][1,4]-benzoxazino[3,2-c]phenothiazine correspondingly. Another complex ring system, 12-chloro-9-methoxy-8-azabenzo[a][1,4]benzoxazino-[3,2-c]phenothiaizne was accomplished in a good yield by the condensation of 3 with 3-amino-6-methoxypyridin-2-thiol. The structural confirmation was done using UV-visible spectroscopy, FT-IR, 1H NMR, 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.
报告了酸催化合成苯并恶嗪吩噻嗪衍生物的方法。中间体 6-氯-5H-苯并[a]吩噻嗪-5-酮(1)、11-氨基-6-氯-9-硫代-8,10-二氮杂苯并[a]吩恶嗪-5-酮(2)和 6,8-二氯苯并[a]吩恶嗪-5-酮(3)是由 2、在碱性介质中分别与 2-氨基苯硫酚、4,5-二氨基-6-羟基嘧啶-2-硫醇和 2-氨基-6-氯苯酚缩合制备出 2,3-二氯-1,4-萘醌和 6,8-二氯苯并[a]吩噁嗪-5-酮(3)。中间产物 1 和 2 分别与 4-氨基苯硫酚进一步碱性缩合,得到 14-硝基苯并[a][1,4]苯并恶嗪并[3,2-c]吩噻嗪和 15-氨基-13-硫代-12,14-二氮杂苯并[a][1,4]苯并恶嗪并[3,2-c]吩噻嗪。3 与 3-氨基-6-甲氧基吡啶-2-硫醇缩合,得到了另一个复杂的环系统,即 12-氯-9-甲氧基-8-氮杂苯并[a][1,4]苯并恶嗪并[3,2-c]吩噻嗪,收率很高。利用紫外-可见光谱、傅立叶变换红外光谱、1H NMR、13C NMR 和元素分析进行了结构确认。针对一些微生物对合成的化合物进行了筛选,结果表明这些复合物衍生物对微生物具有显著的活性。