中草药  2016, Vol. 47 Issue (20): 3569-3572
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多花黄精地上部分化学成分的研究
徐景萱, 刘力, 杨胜祥, 况燚     
浙江农林大学 浙江省林业生物质化学利用重点实验室, 浙江 临安 311300
摘要: 目的 研究多花黄精Polygonatum cyrtonema地上部分的化学成分。 方法 采用色谱分离技术进行分离和纯化,并根据波谱学数据鉴定化合物的结构。 结果 从多花黄精地上部分的甲醇提取物中分离得到15个化合物,分别鉴定为 (3R)-5,7-dihydroxy-3-(2'-hydroxy-4'-methoxybenzyl)-chroman-4-one(1)、5,7-dihydroxy-6-methyl-3-(2',4'-dihydroxybenzyl)-chroman-4-one(2)、5,7-dihydroxy-6-methyl-3-(4'-hydroxybenzyl)-chroman-4-one(3)、(3S)-3,7-dihydroxy-8-methoxy-3-(3',4'-methylenedioxybenzyl)-chroman-4-one(4)、芹菜素(5)、山柰酚(6)、香草酸(7)、反式对羟基桂皮酸(8)、反式对羟基桂皮酸甲酯(9)、水杨酸(10)、(+)-丁香脂酸(11)、balanophonin B(12)、咖啡酸(13)、苯丙氨酸(14)和松柏醛(15)。 结论 化合物1、2、7、11、1415为首次从多花黄精中分离得到,化合物3、412为首次从黄精属植物中分离得到。
关键词: 多花黄精     香草酸     (+)-丁香脂酸     balanophonin B     松柏醛    
Chemical constituents from aerial part of Polygonatum cyrtonema
XU Jing-xuan, LIU Li, YANG Sheng-xiang, KUANG Yi     
Zhejiang Provincial Key Laboratory of Chemical Utilization of Forestry Biomass, Zhejiang A & F University, Lin'an 311300, China
Abstract: Objective To study the chemical constituents from the aerial part of Polygonatum cyrtonema. Methods The compounds were isolated and purified by means of chromatographic techniques and their structures were identified on the basis of spectral features. Results Fifteen known compounds were isolated in methanol extract from the aerial part of P. cyrtonema and their structures were identified as (3R)-5,7-dihydroxy-3-(2'-hydroxy-4'-methoxybenzyl)-chroman-4-one (1), 5,7-dihydroxy-6-methyl-3-(2',4'-dihydroxybenzyl)-chroman-4-one (2), 5,7-dihydroxy-6-methyl-3-(4'-hydroxybenzyl)-chroman-4-one (3), (3S)-3,7-dihydroxy-8-methoxy-3-(3',4'-methylenedioxybenzyl)-chroman-4-one (4), apigenin (5), kaempferol (6), vanillic acid (7), trans-p-hydroxycinnamic acid (8), trans-p-hydroxycinnamic acid methyl ester (9), saliylic acid (10), (+)-syringaresinol (11), balanophonin B (12), caffeic acid (13), phenylalanine (14), and coniferaldehyde (15). Conclusion Compounds 1, 2, 7, 11, 14, and 15 are firstly obtained from P. cyrtonema. Compounds 3, 4, and 12 are isolated from the plants of Polygonatum Mill. for the first time.
Key words: Polygonatum cyrtonema Hua     vanillic acid     (+)-syringaresinol     balanophonin B     coniferaldehyde    

多花黄精Polygonatum cyrtonema Hua为多年生草本阴性植物,系百合科(Liliaceae)黄精属Polygonatum Mill. 药用植物,以其根茎入药,具有补气润肺、养阴生津、益肾补脾、延年益寿等功效。现代药理学研究证明,多花黄精具有抗衰老、抗肿瘤、降血糖、调血脂、抗粥样动脉硬化、抗病毒、抗菌、提高机体免疫功能等多种药理作用[1]。目前,对多花黄精化学成分的研究主要集中在块状根部分,主要化学成分为黄酮类、三萜皂苷类和木脂素类化合物[2-3]。但是,对其地上部分化学成分的研究尚未见文献报道,为了更好地开发利用多花黄精的地上部分,本实验对多花黄精地上部分的化学成分进行了研究,从其甲醇提取物中分离得到15个化合物,分别鉴定为 (3R)-5,7-dihydroxy-3-(2′-hydroxy-4′-methoxybenzyl)-chroman-4-one(1)、5,7-dihydroxy- 6-methyl-3-(2′,4′-dihydroxybenzyl)-chroman-4-one(2)、5,7-dihydroxy-6-methyl-3-(4′-hydroxybenzyl)- chroman-4-one(3)、(3S)-3,7-dihydroxy-8-methoxy-3-(3′,4′-methylenedioxybenzyl) chroman-4-one(4)、芹菜素(apigenin,5)、山柰酚(kaempferol,6)、香草酸(vanillic acid,7)、反式对羟基桂皮酸(trans-p-hydroxycinnamic acid,8)、反式对羟基桂皮酸甲酯(trans-p-hydroxycinnamic acid methyl ester,9)、水杨酸(saliylic acid,10)、(+)-丁香脂酸 [(+)-syringaresinol,11]、balanophonin B(12)、咖啡酸(caffeic acid,13)、苯丙氨酸(phenylalanine,14)和松柏醛(coniferaldehyde,15)。其中,化合物1、2、7、11、1415为首次从多花黄精中分离得到,化合物3、412为首次从黄精属植物中分离得到。

1 仪器与材料

XRC-1型显微熔点仪(四川大学科仪厂);Bruker DRX-500型核磁共振仪(Bruker公司);VG AUTO spec-3000质谱仪(VG仪器公司)。柱色谱用硅胶(100~200、200~300目)和薄层色谱用硅胶GF254均由青岛海洋化工厂生产。反相用材料RP18为Merck公司产品。Sephadex LH-20由Fluka公司生产。其余试剂均为分析纯。

本实验所用的多花黄精采自浙江临安天目山自然保护区,由浙江农林大学桂仁意副教授鉴定为多花黄精Polygonatum cyrtonema Hua。植物标本(ZA140605)保存于浙江农林大学天然产物研究室。

2 提取与分离

干燥的多花黄精地上部分(5 kg),粉碎,用甲醇室温浸提,合并提取液,减压浓缩得到甲醇总浸膏。将甲醇总浸膏分散在蒸馏水中悬浮,分别用石油醚、醋酸乙酯和正丁醇进行萃取,浓缩后分别得到石油醚浸膏(48 g)、醋酸乙酯浸膏(50 g)和正丁醇浸膏(77 g)。醋酸乙酯浸膏再经硅胶(200~300目)柱色谱,氯仿-甲醇(100∶0→0∶100)梯度洗脱,TLC检测合并为7个组分Fr. 1~7。Fr. 3再进行硅胶柱色谱分离,氯仿-丙酮(10∶1→1∶1)梯度洗脱,TLC检测后合并为4个部分Fr. 3A~3D。Fr. 3B用Sephadex LH-20(甲醇)纯化得到化合物7(9.2 mg)、9(8.8 mg)和13(10.2 mg)。Fr. 4进行硅胶柱色谱分离,用氯仿-甲醇(10∶1→1∶1)梯度洗脱,再用MCI和制备薄层色谱分离得到化合物8(7.9 mg)、10(9.1 mg)、14(9.7 mg)和15(9.7 mg)。Fr. 5进行RP18分离,用甲醇-水(10∶90→80∶20)梯度洗脱,TLC检测后合并为3个部分Fr. 5A~5C。Fr. 5B用Sephadex LH-20(氯仿-丙酮1∶1)分离得到化合物1(8.2 mg)、2(10.5 mg)、3(11.9 mg)和4(9.9 mg)。Fr. 6进行RP18分离,用甲醇-水梯度洗脱,再用Sephadex LH-20(甲醇)和制备薄层色谱分离得到化合物5(8.9 mg)、6(14.7 mg)、11(12.1 mg)和12(9.8 mg)。

3 结构鉴定

化合物1:浅黄色粉末。1H-NMR (500 MHz,CD3OD) δ: 6.88 (1H,d,J = 8.0 Hz,H-6′),6.31 (1H,d,J = 2.0 Hz,H-3′),6.28 (1H,dd,J = 8.0,2.0 Hz,H-5′),5.76 (1H,d,J = 2.0 Hz,H-6),5.70 (1H,d,J = 2.0 Hz,H-8),4.14 (1H,dd,J = 11.5,4.5 Hz,H-2α),4.01 (1H,dd,J = 11.5,8.0 Hz,H-2β),3.73 (3H,s,4′-OCH3),3.15 (1H,dd,J = 13.5,4.5 Hz,H-9α),2.84 (1H,m,H-3),2.56 (1H,dd,J = 13.5,9.5 Hz,H-9β);13C-NMR (125 MHz,CD3OD) δ: 200.9 (C-3),168.8 (C-7),165.7 (C-5),164.9 (C-8a),161.4 (C-4′),157.8 (C-2′),132.6 (C-6′),118.6 (C-1′),105.8 (C-5′),102.7 (C-4a),102.5 (C-3′),97.2 (C-6),96.1 (C-8),70.5 (C-2),55.9 (C-4′-OCH3),46.5 (C-3),28.3 (C-9)。以上数据与文献报道一致[4],故鉴定化合物1为(3R)-5,7-dihydroxy- 3-(2′-hydroxy-4′-methoxybenzyl)-chroman-4-one。

化合物2:浅黄色粉末。1H-NMR (500 MHz,CD3OD) δ: 6.81 (1H,d,J = 8.5 Hz,H-6′),6.25 (1H,d,J = 2.5 Hz,H-3′),6.16 (1H,dd,J = 8.5,2.5 Hz,H-5′),5.80 (1H,s,H-8),4.15 (1H,dd,J = 11.5,4.0 Hz,H-2α),4.02 (1H,dd,J = 11.5,7.0 Hz,H-2β),3.07 (1H,dd,J = 13.5,5.0 Hz,H-9α),2.88 (1H,m,H-3),2.53 (1H,dd,J = 13.5,10.0 Hz,H-9β),1.88 (3H,s,6-CH3);13C-NMR (125 MHz,CD3OD) δ: 200.1 (C-4),165.8 (C-5),162.9 (C-7),162.4 (C-8a),158.4 (C-4′),157.6 (C-2′),132.6 (C-6′),116.8 (C-1′),107.5 (C-5′),105.2 (C-6),103.6 (C-3′),102.5 (C-4a),94.9 (C-8),70.5 (C-2),46.5 (C-3),6.9 (6-CH3)。以上数据和文献报道一致[5],故鉴定化合物2为5,7-dihydroxy-6-methyl-3-(2′,4′-dihydroxybenzyl)-chroman-4-one。

化合物3:浅黄色粉末。1H-NMR (500 MHz,CD3OD) δ: 7.04 (2H,dd,J = 8.5,2.5 Hz,H-2′,6′),6.74 (2H,dd,J = 8.5,2.5 Hz,H-3′,5′),5.95 (1H,s,H-8),4.21 (1H,dd,J = 11.5,4.0 Hz,H-2α),4.05 (1H,dd,J = 11.5,7.0 Hz,H-2β),3.09 (1H,dd,J = 13.5,5.0 Hz,H-9α),2.78 (1H,m,H-3),2.63 (1H,dd,J = 13.5,10.0 Hz,H-9β),1.94 (3H,s,6-CH3);13C-NMR (125 MHz,CD3OD) δ: 200.0 (C-4),166.4 (C-5),163.3 (C-7),162.4 (C-8a),157.6 (C-4′),131.5 (C-2′,6′),130.6 (C-1′),116.8 (C-3′,5′),105.6 (C-6),102.9 (C-4a),95.2 (C-8),70.5 (C-2),48.5 (C-3),33.6 (C-9),7.4 (6-CH3)。以上数据和文献报道一致[6],故鉴定化合物3为5,7-dihydroxy-6-methyl-3-(4′-hydroxybenzyl)- chroman-4-one。

化合物4:浅黄色粉末。1H-NMR (500 MHz,CDCl3) δ: 7.62 (1H,d,J = 8.5 Hz,H-5),6.76 (2H,d,J = 8.5 Hz,H-6,5′),6.74 (1H,brs,H-2′),6.64 (1H,d,J = 8.5 Hz,H-6′),5.96 (2H,s,-OCH2O-),4.42 (1H,d,J = 11.5 Hz,H-2α),4.15 (1H,d,J = 11.5 Hz,H-2β),3.99 (3H,s,8-OCH3);13C-NMR (125 MHz,CDCl3) δ: 194.5 (C-4),156.1 (C-7),154.6 (C-8a),147.6 (C-3′),146.7 (C-4′),134.9 (C-8),128.0 (C-1′),123.8 (C-5),123.5 (C-6′),113.1 (C-4a),110.9 (C-2′),110.5 (C-6′),108.2 (C-5′),100.9 (C-OCH2O-),72.8 (C-2),72.6 (C-3),61.5 (8-OCH3),40.8 (C-9)。以上数据和文献报道一致[7],故鉴定化合物4为 (3S)-3,7-dihydroxy-8-methoxy-3-(3′,4′-methylenedioxybenzyl)-chroman-4-one。

化合物5:黄色粉末。1H-NMR (500 MHz,CD3OD) δ: 7.94 (2H,d,J = 8.5 Hz,H-2′,6′),6.93 (2H,d,J = 8.5 Hz,H-3′,5′),6.77 (1H,s,H-3),6.49 (1H,brs,H-8),6.18 (1H,brs,H-6);13C-NMR (125 MHz,CD3OD) δ: 181.8 (C-4),164.0 (C-2),163.8 (C-7),161.5 (C-5),161.2 (C-4′),157.4 (C-9),128.6 (C-2′,6′),121.3 (C-1′),115.9 (C-3′,5′),103.8 (C-10),102.7 (C-3),98.9 (C-6),93.8 (C-8)。以上数据与文献报道一致[8],故鉴定化合物5为芹菜素。

化合物6:黄色粉末。1H-NMR (500 MHz,CD3OD) δ: 8.04 (2H,d,J = 8.5 Hz,H-2′,6′),6.89 (2H,d,J = 8.5 Hz,H-3′,5′),6.38 (1H,d,J = 2.0 Hz,H-8),6.16 (1H,d,J = 2.0 Hz,H-6);13C-NMR (125 MHz,CD3OD) δ: 177.4 (C-4),165.6 (C-7),162.6 (C-5),160.5 (C-4′),158.3 (C-9),148.0 (C-2),137.0 (C-3),130.7 (C-2′,6′),123.7 (C-1′),116.2 (C-3′,5′),104.6 (C-10),99.3 (C-6),94.6 (C-8)。以上数据与文献报道一致[9],故鉴定化合物6为山柰酚。

化合物7:无色粉末。1H-NMR (500 MHz,CD3OD) δ: 7.57 (1H,brs,H-2),7.55 (1H,dd,J = 8.5,2.0 Hz,H-6),6.83 (1H,d,J = 8.5 Hz,H-5),3.89 (3H,s,4-OCH3);13C-NMR (125 MHz,CD3OD) δ: 170.1 (COOH),152.6 (C-3),148.7 (C-4),125.3 (C-6),123.1 (C-1),115.7 (C-2),113.9 (C-5),56.5 (4-OCH3)。以上数据和文献报道一致[10],故鉴定化合物7为香草酸。

化合物8:白色针状晶体(甲醇)。1H-NMR (500 MHz,CD3OD) δ: 7.58 (1H,d,J = 15.5 Hz,H-7),7.43 (2H,d,J = 8.5 Hz,H-2,6),6.80 (2H,d,J = 8.5 Hz,H-3,5),6.29 (1H,d,J = 15.5 Hz,H-8);13C-NMR (125 MHz,CD3OD) δ: 171.1 (C-9),161.0 (C-4),146.4 (C-7),131.0 (C-2,6),127.2 (C-1),116.7 (C-3,5),116.0 (C-8)。以上数据和文献报道一致[11],故鉴定化合物8为反式对羟基桂皮酸。

化合物9:白色针状晶体(甲醇)。1H-NMR (500 MHz,DMSO-d6) δ: 10.09 (1H,brs,H-OH),7.58 (1H,d,J = 15.5 Hz,H-7),7.55 (2H,d,J = 8.5 Hz,H-2,6),6.79 (2H,d,J = 8.5 Hz,H-3,5),6.40 (1H,d,J = 15.5 Hz,H-8),3.68 (3H,s,9-OCH3);13C-NMR (125 MHz,DMSO-d6) δ: 170.1 (C-9),159.8 (C-4),144.8 (C-7),130.4 (C-2,6),125.0 (C-1),115.8 (C-3,5),113.7 (C-8),51.1 (9-OCH3)。以上数据和文献报道一致[11],故鉴定化合物9为反式对羟基桂皮酸甲酯。

化合物10:无色针状晶体(甲醇)。1H-NMR (500 MHz,CDCl3) δ: 7.94 (1H,dd,J = 8.0,2.0 Hz,H-6),7.52 (1H,m,H-4),7.01 (1H,d,J = 8.0 Hz,H-3),6.94 (1H,m,H-5);13C-NMR (125 MHz,CDCl3) δ: 174.0 (C-7),162.1 (C-2),136.9 (C-4),119.4 (C-5),111.4 (C-1),117.7 (C-3),130.9 (C-6)。以上数据和文献报道一致[12],故鉴定化合物10为水杨酸。

化合物11:白色片状晶体(甲醇)。1H-NMR (500 MHz,CD3OD) δ: 6.67 (4H,s,H-2,2′,6,6′),4.72 (2H,d,J = 4.5 Hz,H-7,7′),4.25 (2H,dd,J = 9.0,7.0 Hz,H-9α,9′α),3.88 (2H,dd,J = 9.0,3.5 Hz,H-9β,9′β),3.86 (12H,s,3,3′,5,5′-OCH3),3.16 (2H,m,H-8,8′);13C-NMR (125 MHz,CD3OD) δ: 149.6 (C-3,3′,5,5′),136.3 (C-4,4′),133.3 (C-1,1′),104.4 (C-2,2′,6,6′),87.9 (C-7,7′),72.9 (C-9,9′),56.8 (3,3′,5,5′-OCH3),55.6 (C-8,8′)。以上数据和文献报道一致[13],故鉴定化合物11为 (+)-丁香脂酸。

化合物12:白色粉末。1H-NMR (500 MHz,CD3OD) δ: 6.98 (1H,d,J = 2.0 Hz,H-3′),6.94 (1H,d,J = 2.0 Hz,H-3),6.87 (1H,dd,J = 8.0,2.0 Hz,H-5′),6.85 (1H,dd,J = 8.0,2.0 Hz,H-5),6.82 (1H,d,J = 8.0 Hz,H-6′),6.80 (1H,d,J = 8.0 Hz,H-6),5.40 (1H,d,J = 4.5 Hz,H-7′),5.23 (1H,d,J = 4.5 Hz,H-7),4.30 (1H,m,H-9α),4.04 (1H,m,H-9β),3.88 (3H,s,2′-OCH3),3.86 (3H,s,2-OCH3),3.66 (1H,m,H-8′),3.36 (1H,d,J = 4.5 Hz,H-8);13C-NMR (125 MHz,CD3OD) δ: 179.9 (C-9),149.7 (C-2′),149.5 (C-2),148.6 (C-1′),147.8 (C-1),133.5 (C-4′),132.6 (C-4),120.1 (C-5′),119.8 (C-5),116.8 (C-6′),116.4 (C-6),111.0 (C-3′),110.9 (C-3),87.4 (C-7′),85.4 (C-7),74.1 (C-9′),56.8 (2′-OCH3),56.7 (2-OCH3),54.8 (C-8′),51.3 (C-8)。以上数据和文献报道一致[14],故鉴定化合物12为balanophonin B。

化合物13:淡黄色粉末。1H-NMR (500 MHz,CD3OD) δ: 6.19 (1H,d,J = 16.0 Hz,H-8),6.78 (1H,d,J = 8.0 Hz,H-5),6.93 (1H,dd,J = 8.0,2.0 Hz,H-6),7.00 (1H,d,J = 2.0 Hz,H-2),7.52 (1H,d,J = 16.0 Hz,H-7);13C-NMR (125 MHz,CD3OD) δ: 127.9 (C-1),115.8 (C-2),146.9 (C-3),149.4 (C-4),116.7 (C-5),122.8 (C-6),147.1 (C-7),115.1 (C-8),171.3 (C-9)。以上数据和文献报道基本一致[15],故鉴定化合物13为咖啡酸。

化合物14:白色粉末。1H-NMR (500 MHz,D2O) δ: 7.36 (2H,d,J = 8.0 Hz,H-2,6),7.30 (1H,dd,J = 8.0,1.5 Hz,H-4),7.24 (2H,d,J = 8.0 Hz,H-3,5),3.90 (1H,t,J = 6.5 Hz,H-8),3.21 (1H,dd,J = 14.5,5.0 Hz,H-7α),3.04 (1H,dd,J = 14.5,5.0 Hz,H-7β);13C-NMR (125 MHz,D2O) δ: 173.9 (C-9),135.2 (C-1),129.4 (C-3,5),129.2 (C-2,6),127.6 (C-4),56.1 (C-8),36.4 (C-7)。以上数据和文献报道基本一致[16],故鉴定化合物14为苯丙氨酸。

化合物15:淡黄色粉末。1H-NMR (500 MHz,CDCl3) δ: 9.63 (1H,d,J = 7.5 Hz,H-9),7.39 (1H,d,J = 16.0 Hz,H-7),7.12 (1H,dd,J = 8.0,2.0 Hz,H-5),7.09 (1H,d,J = 2.0 Hz,H-2),6.93 (1H,d,J = 8.0 Hz,H-6),6.58 (1H,dd,J = 16.0,8.0 Hz,H-8),3.95 (3H,s,2-OCH3);13C-NMR (125 MHz,CDCl3) δ: 193.8 (C-8),153.5 (C-7),149.2 (C-1),147.0 (C-2),126.9 (C-4),126.5 (C-8),124.4 (C-5),115.2 (C-6),109.7 (C-3),56.1 (2-OCH3)。以上数据和文献报道一致[17],故鉴定化合物15为松柏醛。

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