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葛根素衍生物的合成、表征及衍生化反应机理

韩瑞敏1, 田玉玺1, 王鹏1, 向俊锋2, 艾希成1, 张建平1   

    1. 中国科学院化学研究所, 分子动态与稳态结构国家重点实验室,
    2. 分析测试中心, 北京 100080
  • 收稿日期:2005-10-21 修回日期:1900-01-01 出版日期:2006-09-10 发布日期:2006-09-10
  • 通讯作者: 张建平

Synthesis and Characterization of Puerarin Derivatives and the Mechanism of Derivation Reaction

HAN Rui-Min1, TIAN Yu-Xi1, WANG Peng1, XIANG Jun-Feng2, AI Xi-Cheng1, ZHANG Jian-Ping1   

    1. State Key Laboratory for Structural Chemistry of Unstable and Stable Species,
    2. Center for Physiochemical Analysis & Measurement, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100080, China
  • Received:2005-10-21 Revised:1900-01-01 Online:2006-09-10 Published:2006-09-10
  • Contact: ZHANG Jian-Ping

摘要: 合成了葛根素的7,4'-二丙基(Ⅰ), 7-单丙基(Ⅱ)和4'-单丙基(Ⅲ)三种取代衍生物. 其中7-丙基葛根素Ⅱ属于新型取代衍生物; 变温1H NMR和理论计算结果表明, 在300 K时, 葛根素和4'-丙基葛根素(Ⅲ)以单一构型存在; 而7,4'-二丙基葛根素(Ⅰ)和7-丙基葛根素(Ⅱ)则存在两种核磁可分辨的旋转异构体, 当温度升至330 K时, 两种异构体可以相互转化; 通过对比分析葛根素及其衍生物脱质子产物的紫外可见吸收光谱并结合理论计算, 确定了A环上7位酚羟基比B环上4'位酚羟基先脱去质子, 并由此进一步阐明了葛根素衍生化反应机理以及在抗氧化作用中可能的活性位点和结构活性关系.

关键词: 葛根素, 衍生物, 1H NMR, 抗氧化 

Abstract: 7,4'-Dipropyl(Ⅰ), 7-propyl(Ⅱ) and 4'-propyl(Ⅲ) derivatives of puerarin were synthesized and characterized by using 1H NMR, NOESY and HRMS. Among the derivatives, Ⅱ is a new-type substituted compound of puerarin. 1H NMR spectroscopic analysis of aromatic protons combined with theoretical analysis of molecular structures proved the existence of two rotational isomers at 300 K, as well as a rapid interconversion equilibrium at 330 K for both compounds Ⅰ and Ⅱ. However, only one conformer exists for compound Ⅲ and puerarin containing 7-phenolic hydroxyl instead of propyl in A-ring as the case of compounds Ⅰ and Ⅱ. Based on UV-Visible absorption data of neutral and basic solutions, and on the density function calculations, the 7-phenolic hydroxyl group in A-ring was found to be more acidic than the 4'-phenolic hydroxyl group in B-ring. The mechanism of derivation reaction and the structure-reactivity relationship of puerarin as an antioxidant were further discussed.

Key words: Puerarin, Derivative, 1H NMR, Antioxidation

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