Synthesis, Characterization, Antimicrobial and Antioxidant Activities of The Homocyclotrimer Of 4-Oxo-4h-Thieno[3,4-C]Chromene-3-Diazonium Sulfate
作者:Emmanuel Sopbue Fondjo、Djeukoua Dimo Kamal Sorel、Tamokou Jean-de-Dieu、Tsemeugne Joseph、Kouamo Sylvian、Ngouanet Doriane、Chouna Jean Rodolphe、Nkeng-Efouet-Alango Pepin、Kuiate Jules-Roger、Ngongang Ndjintchui Arnaud、Sondengam Beibam Lucas
DOI:10.2174/1874104501610010021
日期:2016.6.30
The in situ formed 4-oxo-4H-thieno[3,4-c]chromene-3-diazonium sulfate (5) in the coupling reactions involving the parent 2-aminothiophene (4) and various phenolic and arylamines’ couplers, readily undergoes homocyclotrimerization at low temperature to afford in fairly good yield the first ever reported eighteen member ring heteroaromatic holigomer 6. Compound 6 was fully characterized by its elemental analysis, IR, UV-Vis, 1H-NMR, 13C-NMR and HRMS spectral data. The HMBC and HSQC techniques were used to ascertain the structural assignments. A comparative study on the antimicrobial and antioxidant activities of compounds 3, 4 and 6 was carried out to assess the SAR due to the transformations (from 3 to 6 via 4) on the tested compounds. It was found that compounds 6 and 4 were respectively the most active compounds against bacteria (MIC = 32-64 μg/ml) and yeasts (MIC = 16–64 μg/ml). Compound 6 also showed high radical-scavenging activities and ferric reducing power when compared with vitamin C and BHT used as reference antioxidants.
在涉及母体2-氨基噻吩(4)与各种酚类和芳香胺耦合剂的耦合反应中原位形成的4-氧代-4H-噻吩[3,4-c]色烯-3-重氮硫酸盐(5),在低温下很容易发生同环三聚反应,得到首次报道的十八元环杂芳烃聚合物6,产率相当不错。化合物6通过元素分析、红外光谱、紫外可见光谱、1H-NMR、13C-NMR和高分辨质谱数据进行了全面表征。利用HMBC和HSQC技术确认了结构分配。对化合物3、4和6的抗微生物和抗氧化活性进行了比较研究,以评估由于转化(从3到6通过4)对所测试化合物的SAR的影响。结果发现,化合物6和4分别对细菌(最小抑制浓度=32-64 μg/ml)和酵母(最小抑制浓度=16–64 μg/ml)具有最强的活性。与作为参考抗氧化剂的维生素C和BHT相比,化合物6还表现出较高的清除自由基活性和铁离子还原能力。