Qiangjian Zhang, Yunyun Wang, Yuxun Zhao
2019
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Chinese Journal of Organic Chemistry
Abstract
A series of camphorsulfonic acid thiazolylhydrazone derivatives were synthesized by using camphorsulfonic acid derivated from natural camphor as the starting material in three steps, including condensation with aminothiourea and cyclization with bromoacetophenone. Their structures were characterized by H NMR, C NMR and HR-MS, and their antioxidant activities were also investigated. The results showed that these compounds had good antioxidant activities compared with the positive control trolox. Among of them, (2-(2-(4-(4-cyanophenyl)thiazol-2-yl)indenyl)-7,7-dimethylbicyclo[2.2.1]hept-1-yl)methanesulfonic acid (Q19) exhibited the relatively strong 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity with IC50 value of 176 μmol/L, (2-(2-(4-(4-fluorophenyl)thiazol-2-yl)hydrazino)-7,7-dimethylbicyclo[2.2.1]hept-1-yl)methanesulfonic acid (Q3) exhibited the relatively strong diammonium 2,2'-azino-bis(3-ethylbenzothiazoline6-sulfonate) (ABTS) radical scavenging activity with IC50 value of 20.6 μmol/L, (E)-(7,7-dimethyl-2-(2-(4-(3-methyl)-thiazol2-yl)indenyl)bicyclo[2.2.1]hept-1-yl)-sulfonic acid (Q8) exhibited the strong hydroxyl radical scavenging activity with scavenge rate 66.2%, (2-(2-(4-(4-biphenyl)thiazol-2-yl)indenyl)-7,7-dimethylbicyclo[2.2.1]hept-1-yl)methane-sulfonic acid (Q20) exhibited the relatively strong superoxide radical scavenging activity with IC50 value of 20.7 μmol/L. Compared with the posiChinese Journal of Organic Chemistry ARTICLE Chin. J. Org. Chem. 2019, 39, 2616~2624 © 2019 Chinese Chemical Society & SIOC, CAS http://sioc-journal.cn/ 2617 tive control kojic acid, (2-(2-(4-(2-hydroxyphenyl)thiazol-2-yl)arylene)-7,7-dimethylbicyclo[2.2.1]hept-1-yl)methanesulfonic acid (Q16) exhibited remarkable tyrosinase inhibitory activity with IC50 value of 154.9 μmol/L. It was known from the structure-activity relationship that the structure of R gave great influence on the activities of thiazolylhydrazone derivatives.