CN106467509A - 丹酚新酸化合物及其制备方法和应用 - Google Patents
丹酚新酸化合物及其制备方法和应用 Download PDFInfo
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- C07D307/77—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom ortho- or peri-condensed with carbocyclic rings or ring systems
- C07D307/78—Benzo [b] furans; Hydrogenated benzo [b] furans
- C07D307/82—Benzo [b] furans; Hydrogenated benzo [b] furans with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to carbon atoms of the hetero ring
- C07D307/84—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen
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- Chemical & Material Sciences (AREA)
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- Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
Abstract
本发明公开了结构式(I)的丹酚新酸化合物,该化合物中苯并四氢呋喃单元的2位和3位为顺式构型。本发明还公开了该丹酚新酸化合物的制备方法和应用。本发明的丹酚新酸化合物,不仅具有明显的抗脂质过氧化的作用,而且还有显著的抑制和清除羟自由基的作用,非常适于治疗冠心病等急慢性心脑血管疾病,在防治老年痴呆等神经退行性疾病方面也具有良好的应用前景。
Description
技术领域
本发明涉及天然药物化学技术领域,具体涉及一种从丹参干燥药材(S.miitiurrhizu)中提取分离的丹酚新酸化合物及其制备方法和应用。
背景技术
丹参是中医最常用的药材之一,有祛瘀止痛、活血通经、清心除烦等多种功效。近年来的研究结果表明,丹参中起抗菌作用的主要是脂溶性成分,起活血化瘀作用的主要是水溶性成分,水溶性丹参酚酸类是丹参的主要有效成分,具有抗脂质过氧化、抗血栓、改善血液循环等作用,是丹参复方制剂治疗冠心病、心脑血管疾病的主要功能因子。丹参酚酸类可增加体内抗氧化物维生素C、维生素K、谷胱甘肽和SOD、谷胱甘肽过氧化物酶、过氧化氢酶等含量,保护局限性脑缺血-再灌注所致的线粒体损伤,抑制脑缺血-再灌注导致的神经细胞凋亡,在防治脑缺血和老年痴呆等急慢性神经退行性疾病具有良好的前景。
丹参中的总酚酸含有多种,如原儿茶酸,原儿茶醛,咖啡酸,迷迭香酸,丹酚酸A,丹酚酸B,丹酚酸C,丹酚酸D,丹酚酸E,原紫草酸,紫草酸,异阿魏酸等。其中丹酚酸A和丹酚酸B为主要化学成分。丹酚酸是一类以丹参素为基本单位的缩合酚酸化合物,属苯丙素类化合物。
20世纪80年代以来,我国科学家们对丹参的水溶性成分进行了大量的研究工作,证明了不同结构的丹酚酸具有不同的功能活性,例如:丹参素能显著扩张冠状动脉,缩小心肌梗死范围及减轻病程。丹酚酸A可以抑制脂质过氧化,丹酚酸B既具有抗脂质氧化,也具有扩张冠状动脉的作用。
但是,至今尚无关于本发明丹酚新酸化合物的公开报道。
发明内容
本发明要解决的技术问题是提供一种新的丹酚酸化合物,命名为丹酚新酸,该丹酚新酸化合物的苯并四氢呋喃结构为顺式构型,该化合物不仅具有抗脂质氧化作用,也具有扩张冠状动脉的作用,适用于治疗冠心病、及防治脑缺血和老年痴呆等急慢性神经退行性疾病。
此外,还需要提供一种丹酚新酸化合物的制备方法和应用。
为了解决上述技术问题,本发明通过如下技术方案实现:
在本发明的一个方面,提供了一种结构式(I)的丹酚新酸化合物或其药用盐,该化合物中苯并四氢呋喃单元的2位和3位为顺式构型。
本发明丹酚新酸化合物中苯并四氢呋喃单元的2位和3位为顺式构型,而现有报道的丹酚酸B化合物中苯并四氢呋喃单元的2位和3位为反式构型。
所述丹酚新酸化合物中苯并四氢呋喃单元的2位和3位的绝对构型为2R,3S;该化合物的旋光在0.5%盐酸处理后,由[α]25 D=+85增加到[α]25 D>+120。
在本发明的另一方面,提供了一种药物组合物,包含安全有效量的上述式(I)化合物或其药用盐、以及药学上可接受的载体。
上述可接受的载体是无毒的、能辅助施用并且对式(I)丹酚新酸化合物的治疗效果没有不利影响。此类载体可以是本领域的技术人员通常能得到的任何固体赋形剂、液体赋形剂、半固体赋形剂或者在气雾剂组合物中可以是气体赋形剂。固体药物赋形剂包括淀粉、纤维素、滑石、葡萄糖、乳糖、蔗糖、明胶、麦芽、稻米、面粉、白垩、硅胶、硬脂酸镁、硬脂酸钠、甘油硬脂酰酯、氯化钠、无水脱脂乳等。液体和半固体赋形剂可以选自甘油、丙二醇、水、乙醇和各种油,包括那些源于石油、动物、植物或人工合成的油,例如,花生油、豆油、矿物油、芝麻油等。另外还可以在组合物中加入其它辅剂如香味剂、甜味剂等。
本发明的丹酚新酸化合物或其药用盐以治疗上的有效量施用,其施用方式可以是口服、全身施用(例如透过皮肤的或鼻吸入的)或肠胃外施用(例如肌肉内、静脉内或皮下)。优选的施用方式是口服,它可根据疾病程度调节。
本发明的丹酚新酸化合物或其药用盐的实际施用量(即活性组分)依赖于许多因素,如待治疗疾病的严重性、治疗对象的年龄和相对健康程度、所使用的化合物的效能、施用途径和形式,以及其他因素。
本发明药物组合物的各种剂型可以按照药学领域的常规方法制备。例如使该丹酚新酸化合物或其药用盐(活性成分)与一种或者多种载体混合,然后将其制成所需的剂型,如片剂、药丸、胶囊、半固体、粉末、缓释剂型、溶液、混悬液、配剂、气雾剂等等。
在本发明的另一方面,还提供了一种丹酚新酸化合物的制备方法,包括以下步骤:
丹参干燥药材切片后,用药材5-10倍量的0%-90%乙醇溶剂在20-90℃下进行加热提取1-3次,每次0.5-2h,得到提取液;
提取液在压力10-98Kpa,温度50-90℃下减压浓缩,制成浓缩液;
浓缩液过滤后以等体积的有机溶剂提取三次,去除脂溶性成分;
水相溶液浓缩得丹参总酚酸浓缩液,该丹参总酚酸浓缩液用等量硅胶拌样,用硅胶柱层析分离,依次用氯仿:甲醇:甲酸为6:1:0.01-4:1:0.01的洗脱剂梯度洗脱,得到馏分1,馏分2,馏分3,馏分4,馏分5;馏分5用Sephadex LH-20分离,9:1-3:7的甲醇:水洗脱,得丹酚新酸。
优选的,在丹参干燥药材用乙醇溶剂加热提取过程中,采用超声波以提高收率。
所述用于去除浓缩液中脂溶性成分的有机溶剂包括乙酸乙酯、二氯甲烷、或二氯乙烷。
在本发明的另一方面,还提供了上述丹酚新酸化合物在制备预防或治疗急慢性心脑血管疾病的药物中的应用。
所述急慢性心脑血管疾病包括冠心病、脑出血、脑中风等。
在本发明的另一方面,还提供了上述丹酚新酸化合物在制备预防或治疗神经退行性疾病的药物中的应用。
所述神经退行性疾病包括阿尔茨海默病、帕金森病等。
在本发明的另一方面,还提供了一种包含上述丹酚新酸化合物的自由基清除剂。
本发明的丹酚新酸化合物,是一个具有新构型的丹酚酸类化合物,经动物试验结果表明,该化合物不仅具有明显的抗脂质过氧化、抗血栓、改善血液循环的作用,而且还有显著的抑制和清除羟自由基的作用,非常适用于治疗冠心病、急慢性心脑血管疾病,在防治脑缺血和老年痴呆等急慢性神经退行性疾病方面也具有良好的应用前景。
具体实施方式
实施例1 丹酚新酸的制备
丹参干燥药材(S.miitiurrhizu)20公斤切片后以用药材10倍量(V/W)即200公斤50%乙醇溶剂在70℃下进行加热提取3次,每次0.5小时,得到提取液。提取液在压力10-98Kpa,温度60-70℃下减压浓缩,制成浓缩液40L。加水稀释到80L后过滤,以等体积的乙酸乙酯提取三次,去除脂溶性成分。减压浓缩到3L,浓缩液用等量硅胶拌样,用硅胶柱层析进行分离,依次用氯仿:甲醇:甲酸(6:1:0.01-4:1:0.01)梯度洗脱,得到馏分1,馏分2,馏分3,馏分4,馏分5;馏分5用Sephadex LH-20分离,甲醇:水(9:1-3:7)洗脱,得丹酚新酸2克。
实施例2 丹酚新酸的制备
丹参干燥药材(S.miitiurrhizu)20公斤切片后以用药材5倍量(V/W)即100公斤90%乙醇溶剂在20℃下进行加热提取2次,每次1小时,得到提取液。提取液在压力10-98Kpa,温度50-60℃下减压浓缩,制成浓缩液40L。加水稀释到80L后,以等体积的二氯甲烷提取三次,去除脂溶性成分。减压浓缩到3L,浓缩液用等量硅胶拌样,用硅胶柱层析进行分离,依次用氯仿:甲醇:甲酸(6:1:0.01-4:1:0.01)梯度洗脱,得到馏分1,馏分2,馏分3,馏分4,馏分5;馏分5用Sephadex LH-20分离,甲醇:水(9:1-3:7)洗脱,得丹酚新酸2克。
实施例3 丹酚新酸的制备
丹参干燥药材(S.miitiurrhizu)20公斤切片后以用药材8倍量(V/W)即160公斤纯水在90℃下进行加热提取1次,每次2小时,得到提取液。提取液加入160L酒精,放置过滤,提取液在压力10-98Kpa,温度80-90℃下减压浓缩,制成浓缩液40L。加水稀释到80L后,以等体积的二氯乙烷提取三次,去除脂溶性成分。减压浓缩到3L,浓缩液用等量硅胶拌样,用硅胶柱层析进行分离,依次用氯仿:甲醇:甲酸(6:1:0.01-4:1:0.01)梯度洗脱,得到馏分1,馏分2,馏分3,馏分4,馏分5;馏分5用Sephadex LH-20分离,甲醇:水(9:1-3:7)洗脱,得丹酚新酸2克。
将实施例1-3制得的丹酚新酸进行理化性质和波谱特征检测,结果如下。
丹酚新酸的理化性质和波谱特征:
白色无定型粉末,[α]25 D=+85(c=0.05,EtOH)
1H NMR(氘代丙酮,400MHz)δ7.61(1H,d,J=16.0Hz,CH=CHCO2CH3),7.22(1H,d,J=8.4Hz,ArH),6.92(1H,d,J=8.8Hz,ArH),6.81-6.71(4H,m,ArH×4),6.65-6.60(4H,m,ArH×4),6.38(1H,d,J=8.4Hz,ArH),6.28(1H,d,J=16.0Hz,CH=CHCO2CH3),5.85(1H,d,J=4.4Hz,ArOCHAr),5.15-5.13(2H,m,ArCH2CHCO2H×2),4.43(1H,d,J=4.4Hz,ArCHCO2R),3.07-2.84(4H,m,ArCH2CHCO2H×2);
13C NMR(Acetone-d6,400MHz)δ171.6,170.8,170.7,166.4,147.9,145.5,145.4,145.0,144.9,144.2,144.1,144.0,142.5,132.4,128.2,127.8,125.5,123.4,121.1,121.0,120.8,117.5,117.2,116.6,116.5,115.7,115.6,115.5,115.4,112.7,86.7,74.3,73.4,56.4,36.7,36.4.
CD(c 0.06,EtOH)(nm)+10204(340),+8761(320),+6592(300),-3009(283),-13629(265),+25614(255),+9692(240),+3647(223)。
经过化学降解和关联证明,该化合物具有2R,3S的绝对构型。
实施例4 丹酚新酸的结构验证
(1)双氢丹酚新酸的合成
2克丹酚新酸(化合物1)溶解于50毫升干燥的THF中,加入20毫克10%的钯碳,用氢气反复驱除反应瓶中的空气后,使反应液在氢气氛下常温搅拌3小时,过滤,浓缩,得双氢丹参新酸(化合物2)1.98克,[α]25 D=+25(c=0.25,EtOH),化合物2的波谱特征如下:
1H NMR(acetone-d6,400MHz)δ6.81(3H,m,ArH×3),6.75-6.65(5H,m,ArH×5),6.62(1H,d,J=8.0Hz,ArH),6.52(1H,d,J=8.4Hz,ArH),6.47(1H,d,J=7.6Hz,ArH),5.73(1H,d,J=5.2Hz,ArOCHAr),5.28(1H,dd,J=3.6and 9.0Hz,ArCH2CHCO2H),5.09(1H,dd,J=4.4Hzand 8.4Hz,ArCH2CHCO2H),4.30(1H,d,J=5.2Hz,ArCHCO2R),3.13-2.91(4H,m,ArCH2CHCOOH×2),2.73-2.50(4H,m,ArCH2CH2CO2R).
13C NMR(acetone-d6,400MHz)δ172.0,171.3,170.9,170.1,147.6,145.5,145.3,145.0,144.2,144.1,139.9,133.1,129.2,128.3,128.1,124.0,121.2,121.1,121.1,117.6,117.3,116.7,116.5,115.5,115.4,112.7,86.9,73.9,73.2,56.5,36.6,36.5,34.0,26.7。
(2)全甲基化双氢丹酚新酸(化合物3)的制备
80毫克化合物2溶解于2毫升THF中,加入25毫升重氮甲烷乙醚溶液,室温搅拌5天,减压浓缩,纯化后得12毫克化合物3,[α]25 D=+17.5(c=0.4,CHCl3),化合物3的波谱特征如下:
1H NMR(acetone-d6,400MHz)δ7.00(1H,s,ArH),6.93-6.86(5H,m,ArH×5),6.77-6.76(3H,m,ArH×3),6.61-6.59(2H,m,ArH×2),5.90(1H,d,J=6.26Hz,ArOCHAr),5.37(1H,dd,J=4.0and 8.5Hz,ArCH2CHCO2CH3),5.12(1H,dd,J=4.8and 8.3Hz,ArCH2CHCO2CH3),4.44(1H,d,J=6.28Hz,ArCHCO2R),3.86-3.68(27H,m,OCH3×9),3.18-3.00(4H,m,ArCH2CHCOOMe×2),2.72-2.48(4H,m,ArCH2CH2CO2R)。
(3)全甲基化丹酚酸B(化合物4)的制备。
40mg(0.0557mmol)的丹酚酸B(salvianolic acid B,现有的丹酚酸B化合物)和20当量154mg(1.11mmol)的K2CO3悬浮于5mL的干燥丙酮中,向反应瓶中加入30当量(0.158mL,1.67mmol)的硫酸二甲脂。反应混合物在60度下搅拌反应5小时。过滤除去无机盐,滤液浓缩后粗产品经柱层析分离,得到28mg的白色固体产物化合物4(62%),化合物4的波谱特征如下:
1H NMR(Acetone-d6,400MHz)δ7.72(1H,d,J=15.6Hz,CH=CHCO2CH3),7.36(1H,d,J=8.4Hz,ArH),7.07-7.03(3H,m,ArH×3),7.00(1H,d,J=8.4Hz,ArH),6.38(1H,d,J=15.6Hz,CH=CHCO2CH3),6.02(1H,d,J=5.6Hz,ArOCHAr),4.64(1H,d,J=5.6Hz,ArCHCO2CH3),3.92(3H,s,OCH3),3.82(3H,s,OCH3),3.80(3H,s,OCH3),3.79(3H,s,CO2CH3),3.76(3H,s,CO2CH3)。
(4)全甲基化双氢丹酚酸B(化合物5)的制备
30mg的化合物4(0.035mmol)溶解于2毫升THF中,向溶液中加入6mg的10%Pd/C。置换空气为氢气后,反应混合物在室温条件下搅拌2小时。过滤并用THF洗涤滤饼后,合并后的THF溶液浓缩干燥后得到的粗产品。在乙腈和水为流动相的条件下经过制备液相纯化,冻干后得到29毫克的白色固体产物化合物5(97%),化合物5的波谱特征如下:
1H NMR(acetone-d6,400MHz)δ6.97(1H,s,ArH),6.91-6.83(5H,m,ArH×5),6.77-6.74(m,3H,ArH×3),6.59-6.57(2H,m,ArH×2),5.87(1H,d,J=6.12Hz,ArOCHAr),5.34(1H,dd,J=4.4and 8.4Hz,ArCH2CHCO2CH3),5.09(1H,dd,J=4.64and 8.32Hz,ArCH2CHCO2CH3),4.41(1H,d,J=6.12Hz,ArCHCO2R),3.84-3.76(27H,m,OCH3×9),3.16-2.94(4H,m,ArCH2CHCOOCH3×2),2.70-2.48(4H,m,ArCH2CH2CO2R)。
通过比较化合物3和化合物5的偶合常数,我们发现化合物3的J2,3=6.28Hz,化合物5的J2,3=6.12Hz,因此可以推断化合物3的2,3位构型为顺式构型,化合物5的2,3位构型为反式构型。
实施例5 丹酚新酸绝对构型的确定
化合物6的制备。
30mg的化合物2(0.035mmol)溶解于5毫升Et2O中,向溶液中加入80当量的Me3SiCHN2。反应混合物在室温条件下搅拌7天。溶液浓缩干燥后得到粗产品。在乙腈和水为流动相的条件下经过制备液相纯化,冻干后得到19毫克的白色固体产物化合物6,化合物6的波谱特征如下:
1H NMR(acetone-d6,400MHz)δ7.02(1H,s,ArH),6.93(1H,s,ArH),6.91(1H,s,ArH),6.90(1H,d,J=8.4Hz,ArH),6.75(1H,d,J=8.4Hz,ArH),5.92(1H,d,J=5.6Hz,ArOCHAr),4.46(1H,d,J=5.6Hz,ArCHCO2CH3),3.85-3.76(12H,m,OCH3×4),3.56(3H,s,OCH3),2.84-2.74(2H,m,CH2CO2CH3),2.57-2.52(2H,m,ArCH2).13C NMR(acetone-d6,400MHz)δ172.8,172.5,149.9,143.5,133.3,130.4,124.9,121.5,118.4,113.9,111.9,110.0,109.9,87.4,55.8,55.4,52.2,51.0,34.4,27.1。
化合物6的ORD光谱和CD光谱分别在288nm和265nm处显示正的Cotton效应,因此可以推定丹酚新酸具有2R,3S构型。
实施例6 丹酚新酸抗脂质过氧化作用
1.微粒体制备:大鼠禁食一夜,断头处死,先用冷的TMS缓冲液(Tris-HCl 0.05mmol/L,蔗糖0.2mmol/L-1.MgCl33.0mmol/L,PH 7.4)经门静脉冲洗肝脏,于0℃下取肝脏制成匀浆4℃离心20min,再将上清液1.05×105/g离心60min,沉淀即为微粒体。将肝微粒体重悬于TMS缓冲液中,稀释至蛋白含量分别为15g/L(用lowry法测蛋白),储存于-20℃冰箱备用。
2.测定脂质过氧化物丙二醛的含量:反应体系中上述微粒体溶液0.1ml,溶剂或不同浓度的待测药物0.01m1,半胱氨酸(0.01mol/ml)0.02ml,硫酸亚铁(1mmol/L)0.05ml(空白管不加硫酸亚铁),用pH 7.4的0.1mol/L的PBS补充至总体积为1ml。37℃培养30min后,加三氯乙酸和TBA显色剂,测定脂质过氧化物丙二醛的含量。结果表明丹酚新酸对丙二醛(MDA,以光密度表示)生成有明显抑制作用,有量效关系,其作用优于Vit E(见表1)。
表1丹酚新酸抑制脂质过氧化物丙二醛的生成
实施例7 丹酚新酸抑制和清除羟自由基的作用
苯甲酸3mmol/L,K2HPO4/KH2PO4150mmol/L,pH 7.4,Fe2+-EDTA(其中Fe2+0.19mmol/L,EDTA-2Na 0.59mmol/L),H2O20.29mmol/L及各种浓度的药物,总反应体积为3.5ml,加入H2O2启动反应,室温条件下搅拌5h后测定荧光值。按下式计算清除率:s%(清除率)=(F空-F测)/F空×100%。结果丹酚新酸与维生素E相比,可显著清除羟自由基(见表2)。
表2丹酚新酸清除羟自由基的作用
以上所述实施例仅表达了本发明的实施方式,其描述较为具体和详细,但并不能因此而理解为对本发明专利范围的限制。应当指出的是,对于本领域的普通技术人员来说,在不脱离本发明构思的前提下,还可以做出若干变形和改进,这些都属于本发明的保护范围。因此,本发明专利的保护范围应以所附权利要求为准。
Claims (10)
1.一种结构式(I)的丹酚新酸化合物或其药用盐,该化合物中苯并四氢呋喃单元的2位和3位为顺式构型。
2.根据权利要求1所述的化合物,其特征在于,该化合物中苯并四氢呋喃单元的2位和3位的绝对构型为2R,3S。
3.根据权利要求1所述的化合物,其特征在于,该化合物的旋光在0.5%盐酸处理后,由[α]25 D=+85增加到[α]25 D>+120。
4.一种药物组合物,其特征在于,该组合物包含安全有效量的权利要求1至3任一项所述化合物或其药用盐、以及药学上可接受的载体。
5.一种丹酚新酸化合物的制备方法,其特征在于,包括以下步骤:
丹参干燥药材切片后,用药材5-10倍量的0%-90%乙醇溶剂在20-90℃下进行加热提取1-3次,每次0.5-2h,得到提取液;
提取液在压力10-98Kpa,温度50-90℃下减压浓缩,制成浓缩液;
浓缩液过滤后以等体积的有机溶剂提取三次,去除脂溶性成分;
水相溶液浓缩得丹参总酚酸浓缩液,该丹参总酚酸浓缩液用等量硅胶拌样,用硅胶柱层析分离,依次用氯仿:甲醇:甲酸为6:1:0.01-4:1:0.01的洗脱剂梯度洗脱,得到馏分1,馏分2,馏分3,馏分4,馏分5;馏分5用Sephadex LH-20分离,9:1-3:7的甲醇:水洗脱,得丹酚新酸。
6.根据权利要求5所述的制备方法,其特征在于,在丹参干燥药材用乙醇溶剂加热提取过程中,采用超声波以提高收率。
7.根据权利要求5所述的制备方法,其特征在于,所述用于去除浓缩液中脂溶性成分的有机溶剂包括乙酸乙酯、二氯甲烷、或二氯乙烷。
8.权利要求1至3任一项所述的丹酚新酸化合物在制备预防或治疗急慢性心脑血管疾病的药物中的应用。
9.权利要求1至3任一项所述的丹酚新酸化合物在制备预防或治疗神经退行性疾病的药物中的应用。
10.一种自由基清除剂,其特征在于,包含权利要求1至3任一项所述的丹酚新酸化合物。
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