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丹皮酚、丹皮酚衍生物及其结构类似物的生物活性研究
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摘要
丹皮酚(2-羟基-4-甲氧基苯乙酮)是传统中药丹皮的主要有效成分之一,具有广泛的生物活性,如抗菌消炎、镇痛、解热、镇静、催眠、抗肿瘤、抗过敏和预防心血管系统疾病等。本研究优化了提取和合成丹皮酚的方法,并对其主要的官能团进行修饰和改造,合成丹皮酚的衍生物以及结构类似物,通过对丹皮酚、丹皮酚衍生物以及结构类似物的生物活性(抗氧化、抑菌及抗病毒活性)进行对比研究,寻求结构与活性的关系。结果如下:
     1.通过化学全合成的方法制备了2,4-二羟基苯乙酮、丹皮酚以及丹皮酚的4种结构类似物,并分别以丹皮酚和2,4-二羟基苯乙酮为结构模板合成了丹皮酚的衍生物及结构类似物共10种化合物,包括甲基化产物、酯化产物、苯氧乙酸类衍生物、烯丙基醚化产物以及Claisen重排产物、和氯乙酸反应的产物;丹皮酚侧链上的卤代产物以及羰基还原的产物。其中有4种化合物(4-甲氧基-2-烯丙基氧基苯乙酮、3-烯丙基-2-羟基-4-甲氧基苯乙酮、2-羟基-4-烯丙氧基苯乙酮和5-烯丙基-2,4-二羟基苯乙酮)是首次合成。
     2.测试了丹皮酚、丹皮酚衍生物以及结构类似物共16种化合物的抗氧化活性(对羟基自由基·OH的清除能力、对超氧阴离子自由基O2-·清除能力、对DPPH·的清除能力、对小鼠的肝组织脂质过氧化的抑制作用),通过对比不同结构的化合物对自由基清除能力的差异,得到如下的结论:
     (1)上述16种化合物所参与的四种抗氧化反应都和酚羟基的数目密切相关,酚羟基是此类分子具有抗氧化活性的必需官能团。分子中苯环上引入烯丙基能起到增强活性的作用。
     (2)乙酰基也是在反应中起到重要作用的官能团,但不是必需官能团。乙酰基的存在显著降低了苯环上酚羟基清除·OH的活性,但是却显著增强了分子对O2-·自由基的清除能力。
     (3)筛选得到5个具有广泛的较强活性的抗氧化化合物:16号(5-烯丙基-2,4-二羟基苯乙酮)、10号(3-烯丙基2-羟基-4-甲氧基苯乙酮)、1号(2,4-二羟基苯乙酮)、3号(2,5-二羟基苯乙酮)和14号(2-乙基-5-甲氧基苯酚)化合物。
     3.以合成的起始化合物间苯二酚为对照样品,测试了丹皮酚、丹皮酚衍生物以及结构类似物共16种化合物对4种细菌(大肠杆菌、枯草杆菌、金黄葡萄球菌和蜡样芽胞杆菌)、10种病原真菌(白菜黑斑病菌HB、苹果腐烂病菌FL、黄瓜枯萎病菌HK、小麦赤霉病菌CM、小麦纹枯病菌WK、大葱紫斑病菌ZB、黄瓜灰霉病菌HM、葡萄炭疽病菌PTJ、棉花枯萎病菌MK、葡萄黑痘病菌PHD)的抑菌活性,通过分析合成过程中官能团引入或改变与化合物抑菌活性的关系,得到化学结构与生物活性之间的规律,结果表明:共有11种化合物具有较高的抑制细菌和真菌活性,其中10号、16号的作用尤其显著,在其0.5g/L的浓度下,上述4种细菌和10种病原真菌几乎无法生长。
     分子中官能团结构对于化合物抑制细菌和抑制真菌的活性的影响既有相似性也有区别。其中相似点为:分子中的乙酰基结构对抑菌作用均有着非常的作用,可以大大提升抑菌能力;苯环上引入了烯丙基,相对应的抑菌能力会大幅度地提升,在引入的位置上,5位比3位更优;4-OH改变为甲氧基、烯丙氧基、乙氧基时,抑菌的活性变化不大。区别在于:同等浓度下,当2-OH变成烯丙氧基和乙酰氧基时,抑制细菌活性略有下降,但是抑制真菌的活性显著降低,甚至活性消失。
     4.以丹皮酚、丹皮酚衍生物以及结构类似物中的16种化合物为供试材料,以极易感染烟草花叶病毒的烟草品种心叶烟为研究对象,初步筛选出具有高效抗TMV侵染活性的有效抗病毒结构,通过分析化合物结构与活性之间的构效关系,可以推测得到如下结论:
     (1)酚类及其衍生物的分子中的酚羟基数目是影响此类化合物抗病毒活性的最重要的因素,且酚羟基数目越多,抗病毒活性越低。
     (2)当2-OH变成酯键,会大大提高化合物的抗TMV病毒活性。
     (3)当2-OH变成烯丙氧基乙酰氧基时,也会提高化合物的抗TMV病毒活性,但是效果不如乙酸酯显著。而分子中的乙酰基发生α-溴代或者4-甲氧基变成乙氧基,抗TMV病毒活性变化不显著,这说明这些不是影响抗TMV病毒活性的重要因素。
     综上所述,在后续研究中设计合成具有更高抗氧化活性、抑菌活性和抗病毒活性的化合物时,可以根据上述结论,在分子中有目的性的引入官能团,进行分子结构的修饰改造。
Paeonol (2-hydroxy-4-methoxy acetophenone) is one of the main activeingredients of traditional Chinese medicine from the root barks of Paeonia Suffruticeosa Andr and the dried root and the entire plants of Pyenostelma Panicu latum(Bunge) K Schum, with a wide range of biological activities, such as anti-bacterialanti-inflammatory, analgesic, antipyretic, sedative, hypnotic, anti-tumor, anti-allergicand prevention of cardiovascular system diseases. In this study the methods ofextraction and synthesis of paeonol were optimized and the derivatives and structuralanalogues of paeonol were synthesized by modification and transformation of themain functional groups. The biological activities (antioxidant, antibacterial andantiviral activity) of Paeonol of paeonol derivatives and structural analogues werestudied comparatively to seek the relationship between structure and activities.Results are as follows:
     1.2,4–Dihydroxyacetophenone, paeonol and its four structural analogues wereprepared by chemical synthesis,10derivatives and structural analogues weresynthesized with the structure of the paeonol and2,4-dihydroxyphenyl ethanone astemplates including methylated product, the esterification product, phenoxy aceticacid derivatives, allyl-etherified products and the Claisen rearrangement product, thereaction product with richloroacetic acid, halogenated product on the side chain ofpaeonol and the reduction product of the carbonyl group. Among them there are fourkinds of compound (4-methoxy-2-allyloxy-acetophenone,3-allyl-2-hydroxy-4-methoxy-acetophenone,2-hydroxy-4-allyloxyacetophenone and5-allyl-2,4-dihydroxyphenyl ethyl ketone) were first synthesized.
     2. The antioxidant activity (scavenging of hydroxyl radical (OH), superoxideanion radical (O2-), scavenging DPPH, scavenging capacity of mouse liver tissuelipid peroxidation) of16compounds including paeonol, derivatives and structuralanalogues of paeonol were tested. The conclusions were obtained as follows bycomparing the different structures of the compounds and the difference scavenging abilities on the free radicals:
     (1) The participation of the four anti-oxidation reactions of the above-mentioned16kinds of compounds had close relationship with the number of phenolic hydroxylgroup, which showed that the phenolic hydroxyl group is the necessary functionalgroup among these kinds of molecules having anti-oxidation activites. Theintroduction of an allyl group on the benzene rings in the molecule can play the roleof enhanced activity.
     (2) An acetyl group also played an important role in the reaction, but it is notnecessary for the functional group. The presence of an acetyl group on the benzenering significantly reduced the activity of clearing OH, but significantly enhanced theactivity of scavenging O2-radical.
     (3) Five compounds with a wide range of strong antioxidant activities were confirmedby screening, including No.16(5-allyl-2,4-di-hydroxyacetophenone), No.10(3-allyl-2-hydroxy-4-methoxy compoundsacetophenone), No.1(2,4-di-hydroxyacetophenone), No.3(2,5-di-hydroxyacetophenone) and No.14(2-ethyl-5-methoxy-phenol).
     3. The antibacterial activities on four kinds of bacteria and10kinds ofpathogenic fungi of16compounds including paeonol, derivatives and structuralanalogues of paeonol were tested, with resorcinol (the synthesis starting compounds)as the control samples. The conclusions were obtained as follows by comparing thedifferent structures of the compounds and the difference antibacterial activities on thebacteria and pathogenic fungi.
     There are11kinds of compounds having higher inhibition activities on bacterialand fungi, wherein No.10and No.16had especially significant activities. With thepresence of them at the concentration of0.5g/L, the above-mentioned four kinds ofbacteria, and10kinds of pathogenic fungi growed almost impossiblely.
     There are similarities and differences of the functional group to inhibit bacteriaand to inhibit the fungi. Similarities: Acetyl group in the molecules played a veryimportant role in the inhibitory effects, which can greatly enhance the antibacterialactivity; The allyl group introduced on the benzene ring can greatly enhance the corresponding inhibitory capacity, the5position is better than the3position as it isintroduced. When4-OH was changed to methoxy, allyloxy, ethoxy, the antibacterialactivities were not changed greatly. Differences: when the2-OH was changed toallyloxy group and an acetyl group, the antibacterial activities had a slight decrease,but antifungal activities were significantly reduced, even disappeared at the sameconcentration.
     4. The16compounds of paeonol, paeonol derivatives and structural analogueswere tested as materials, the heart leaf tobacco which were easily infected with thetobacco mosaic virus tobacco varieties were studied as the research object; weobtained the structure with highly anti-viral activity by initial screening. Through theanalysis of the structure-activity relationship, the conclusions can be speculated asfollows:
     (1) The most important factor which affect the antiviral activities of such compoundswas the number of phenolic hydroxyl groups in the molecule, with the more numberof phenolic hydroxyl group leading to lower antiviral activities.
     (2) When2-phenolic hydroxyl group was changed into acetate, the resistance activityof compounds to TMV virus will be greatly enhanced.
     (3) When the2-hydroxyl group of the phenol was changed into allyloxy-acetoxy, theanti-TMV virus activity of the compound will be improved, but the effect was lessthan that of acetate significantly. When the acetyl group in the molecule occurs as theα-bromo or the4-methoxy occurs as4-ethoxy, the anti-TMV virus activity did notchange significantly, which indicatied that these were not the important factors toaffect the anti-TMV virus activity.
     In summary, if the compounds having higher antioxidant activities, antibacterialactivities and antiviral activities were designed and synthesized in the subsequentstudy, the introduction of active functional group, the modification and transformationof the molecular structure can be obtained according to the above conclusions.
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