Synthesis and Free Radical-Scavenging Activities of Di-Mannich Bases of Cyclovalone Derivatives
作者:Hayun Hayun、Catur Jatmika、Euis Maras Maswati、Sandi Salim、Rosita Kurniawan、Elizabeth Greffiana Chandra Adam Arditya Fajriawan、Aulika Desthahrina Nareswara
DOI:10.13005/ojc/330607
日期:2017.12.28
Novel di-Mannich bases of cyclovalone derivatives (1) have been synthesized and evaluated their antioxidant activity using DPPH free radical-scavenger method. The structures of the compounds were confirmed on the basis of FT-IR, 1H-NMR, 13C-NMR and mass spectral data. The result of antioxidant evaluation showed that di-Mannich derivative of cyclovalone with diethylamine ((2E,6E)-2,6-bis(3-[(diethylamino)methyl]-4-hydroxy-5-methoxyphenyl}methylidene)cyclohexan-1-one) (2a) exhibited the highest antioxidant activity with IC50 = 39.0 µM. Structure-activity relationship study showed that the higher pKa of the Mannich base, the higher activity (the lower IC50) of the compound.
合成了新型二曼尼希碱环戊酮衍生物 (1),并用 DPPH 自由基清除剂法评估了它们的抗氧化活性。根据 FT-IR、1H-NMR、13C-NMR 和质谱数据确认了化合物的结构。抗氧化评估结果表明,环戊酮与二乙胺的二曼尼希衍生物((2E,6E)-2,6-双(3-[(二乙胺基)甲基]-4-羟基-5-甲氧基苯基}亚甲基)环己烷-1-酮)(2a)表现出最高的抗氧化活性,IC50 = 39.0 µM。结构-活性关系研究表明,曼尼希碱的 pKa 越高,化合物的活性越高(IC50 越低)。