Synthesis and photophysical studies of new benzo[a]phenoxazinium chlorides as potential antifungal agents
作者:M. Inês P.S. Leitão、B. Rama Raju、Sarala Naik、Paulo J.G. Coutinho、Maria João Sousa、M. Sameiro T. Gonçalves
DOI:10.1016/j.tetlet.2016.07.065
日期:2016.8
A set of four new benzo[a]phenoxazinium chlorides possessing ethyl, propyl, decyl and tetradecyl groups at the 9-amino function of the heterocycle along with a propyl group at the 5-amino position was efficiently synthesized. These compounds displayed fluorescence with maximum emission wavelengths of 673 and 685 nm, in anhydrous ethanol and water. All the benzo[a]phenoxazines were evaluated against
有效地合成了一组四个新的苯并[ a ]苯恶嗪氯化物,它们在杂环的9-氨基官能团上具有乙基,丙基,癸基和十四烷基以及在5-氨基位置上具有丙基。这些化合物在无水乙醇和水中显示出最大发射波长为673和685 nm的荧光。在肉汤微量稀释试验中,针对酵母酵母对所有苯并[ a ]吩恶嗪进行了评估。发现它们的抗真菌活性取决于脂族链长度的变化。化合物7的最高MIC活性为1.56μM 包括在杂环核心的9-氨基位置上的二烷基化丙基取代基和在5-氨基位置上的丙基链。
US4200466A
申请人:——
公开号:US4200466A
公开(公告)日:1980-04-29
7-Alkylaminocoumarin-4-acetic acids as fluorescent probe for studies of drug-binding sites on human serum albumin.
7-Alkylaminocoumarin-4-acetic acids I-IX having alkylamino groups different in alkylchain length were synthesized as fluorescence probes for characterization of drug-binding sites on human serum albumin (HSA). The fluorescences of I-IX were quenched or enhanced in the presence of HSA with shifts of the emission maxima to shorter wavelength. The binding constants and the number of binding sites were determined by the spectral changes of the probes I-IX bound to HSA through analysis of Scatchard's and Job's plots. The primary binding sites of the tested probes were found to be site 2 (diazepam site) on HSA from the results of competitive displacement studies. The polarity of site 2 was estimated from the relationship between the emission maximum of the probe of IV and Z-values, and was found to be comparable to that of acetonitrile. Simple attempts to estimate the site 2 region from the molecular size of the probe of VIII obtained using the Corey-Pauling-Koltun molecular model suggest that the hydrophobic cleft at site 2 is about 21-25 Å in depth. The distance between the lone tryptophan residue in HSA and probes bound to site 2 was estimated to be 15-17 Å using Forster's equation on the basis of fluorescence energy transfer. The present data suggest that I-IX are useful as fluorescence probes for the characterization of site 2 on HSA.