附接有三个吩恶嗪化合物ø硝基苯基(3A),米硝基苯基(图3b)和p硝基苯(图3c中制备)基团,并且pH促进发射光谱被用来评估吩恶嗪和吩恶嗪的去质子化的质子化的平衡。他们显示在pH 8.0-10.8附近在650-850 nm处几乎开-关发射响应,与荧光相关的3a-c的p K a s分别为8.7、9.2和8.9。带有吡啶基的两个苯并恶嗪化合物(7a–b进一步制备),pH增强的发射光谱受吩恶嗪鎓和吩恶嗪之间的去质子化质子平衡以及吡啶基和吡啶鎓基之间的平衡影响。它们在600–850 nm处显示出更强的红色和近红外发射,探针7a的p K a,1 = 3.71和p K a,2 = 9.68,探针7b的p K a,1 = 3.71 。此外,荧光成像实验表明探针7a是V79和HeLa细胞的溶酶体生物标记。
Identification of 3-phenylaminoquinolinium and 3-phenylaminopyridinium salts as new agents against opportunistic fungal pathogens
作者:Tryphon K. Mazu、Jagan R. Etukala、Xue Y. Zhu、Melissa R. Jacob、Shabana I. Khan、Larry A. Walker、Seth Y. Ablordeppey
DOI:10.1016/j.bmc.2010.10.065
日期:2011.1
Previous studies on the indoloquinoline alkaloid, cryptolepine (2), revealed that it has antii-nfective properties among other activities. Using Structure-activity relationship (SAR) techniques, several ring-opened analogs of cryptolepine (3-phenylaminopyridinium and 3-phenylaminoquinolinium derivatives) were designed to improve the potency and lower the cytotoxicity shown by several of the precursor agents. Results indicate that these ring-opened analogs constitute new anti-infective agents with over a 100-fold potency and several fold lower cytotoxicity than cryptolepine from which they are derived. Published by Elsevier Ltd.