胡祖艷,范青飛,張玉梅,馮 峰,楊俊林,宋啟示*
1中國(guó)科學(xué)院西雙版納熱帶植物園熱帶植物資源可持續(xù)利用重點(diǎn)實(shí)驗(yàn)室,昆明 650223;2中國(guó)科學(xué)院大學(xué),北京 100049;3 昆明理工大學(xué),昆明 650093
青脆枝[1]學(xué)名為臭味假柴龍樹[NothapodytesnimmonianaGraham,又名Nothapodytesfoetida(Wight)Sleumer 或者M(jìn)appiafoetidaMeirs],為茶茱萸科假柴龍樹屬植物,分布于印度、斯里蘭卡、緬甸、泰國(guó)、柬埔寨、印度尼西亞(蘇門塔臘)、菲律賓(呂宋)、日本琉球群島至我國(guó)臺(tái)灣。青脆枝入藥有抗癌、祛風(fēng)除濕、理氣散寒等作用,全株含喜樹堿。自20 世紀(jì)70年代開始,已有很多外國(guó)科研工作者對(duì)青脆枝進(jìn)行了研究,分離到的化合物主要為喜樹堿及其衍生物[2-8],研究的植物主要采于印度等地區(qū),而國(guó)內(nèi)對(duì)青脆枝的研究較少,特別是對(duì)生長(zhǎng)于中國(guó)大陸的青脆枝的研究。由于地域及生長(zhǎng)環(huán)境的不同,植物中所含的化學(xué)成分可能不同。因此本文以生長(zhǎng)于中國(guó)大陸的青脆枝為對(duì)象,對(duì)其化學(xué)成分進(jìn)行研究,分離鑒定了19 個(gè)化合物。分別為:香樹精(1)、7-酮基-β-谷甾醇(2)、豆甾醇(3)、谷甾-5-烯-3β,7β-二醇(4)、丙氧基香樹精(5)、鵝掌楸堿(6)、松柏苷(7)、丁香酸葡萄糖苷(8)、丁香苷(9)、咖啡酸(10)、6,7-二羥基香豆素(11)、(3R)-3,6,7 三甲基十九碳酸甲酯(12)、喜樹堿(13)、9-甲氧基喜樹堿(14)、10-羥基喜樹堿(15)、麥黃酮(16)、豆甾-5-烯-3β,7α-二醇(17)、胡蘿卜苷(18)、谷甾醇(19)。其中化合物1~12 均為首次從該植物中分離得到。
熔點(diǎn)在XTRC-1 顯微熔點(diǎn)測(cè)定儀上測(cè)定;核磁共振譜用Bruker AV-400、DRX-500 及AvanceⅢ-600超導(dǎo)核磁共振儀測(cè)定,TMS 為內(nèi)標(biāo);EI-MS 用Waters AutoSpec Premier P776 雙聚焦三扇形磁質(zhì)譜儀測(cè)定;柱層析硅膠(200~300 目)及薄板層析硅膠(GF-254)均為青島海洋化工廠生產(chǎn);MCI 為日本三菱化學(xué)株式會(huì)社生產(chǎn);凝膠材料使用GE Healthcare 的Sephadex LH -20。所用有機(jī)試劑均為分析純。
青脆枝(N.nimmoniana)小枝于2012年3月采于云南省西雙版納傣族自治州勐臘縣勐伴,并由中國(guó)科學(xué)院西雙版納熱帶植物園王洪高級(jí)工程師鑒定,標(biāo)本存放于中國(guó)科學(xué)院西雙版納熱帶植物園民族藥研究組實(shí)驗(yàn)室。
將青脆枝小枝晾干,粉碎,稱重得62 kg。用90%甲醇熱回流提取3 次(4、3、3 h)。合并提取液,減壓濃縮得甲醇浸膏6775 g。將取6000 g 浸膏用水?dāng)嚢枞芙庀♂尯笠来斡檬兔?、氯仿、正丁醇萃取,每種溶劑萃取3 次,得到石油醚萃取物521 g,氯仿萃取物335 g,正丁醇萃取物494 g。石油醚部分經(jīng)硅膠柱(200~300 目)分離,以石油醚-丙酮梯度洗脫(90∶10、80∶20、70∶30、60∶40、50∶50、0∶100)得到6 個(gè)組份(A1-A6);A4 經(jīng)反復(fù)硅膠柱層析和Sephadex LH-20 純化,得到化合物3(20 mg)、18(15 mg)、19(20 mg);A5 經(jīng)反復(fù)硅膠柱層析和Sephadex LH-20 純化,得到化合物1(17 mg)、5(13 mg);氯仿部分經(jīng)硅膠柱(200~300 目)分離,以石油醚-丙酮(90∶10、70∶30、60∶40、50∶50、30∶70、0∶100)梯度洗脫,得到B1-B6 六個(gè)組分;B1 經(jīng)反復(fù)硅膠柱層析,MCI 和Sephadex LH-20 純化,得到化合物16(28 mg);B3 經(jīng)反復(fù)硅膠柱層析,MCI 和Sephadex LH-20純化,得到化合物4(29 mg)、17(30 mg);B4 經(jīng)反復(fù)硅膠柱層析,MCI 和Sephadex LH-20 純化,得到化合物13(20 mg)、12(11 mg);B5 經(jīng)反復(fù)硅膠柱層析,MCI 和Sephadex LH-20 純化,得到化合物2(31 mg);正丁醇部分上大孔樹脂分段,分別以20%、40%、60%、80%、100%比例的甲醇/水溶液和丙酮梯度洗脫得到六個(gè)組份(C1-C6);C1 經(jīng)反復(fù)MCI 柱層析和Sephadex LH-20 純化,得到化合物14(40 mg),15(18 mg);C2 經(jīng)反復(fù)MCI 柱層析和Sephadex LH-20 純化,得到化合物6(16 mg)、7(19 mg);C3經(jīng)反復(fù)MCI 柱層析和Sephadex LH-20 純化,得到化合物8(13 mg)、9(20 mg);C4 經(jīng)反復(fù)MCI 柱層析和Sephadex LH-20 純化,得到化合物10(22 mg)、11(10 mg)。
化合物1 白色粉末 mp.187~190 ℃;分子式為C30H50O;EI-MSm/z426[M]+;1H NMR (CDCl3,400 MHz)δ:0.79(3H,s),0.83(3H,s),0.87 (3H,s),0.93 (3H,s),0.96 (3H,s),1.00 (3H,s),1.13(3H,s),3.22(1H,m,H-2),5.18 (1H,t,J=6.9Hz,H-12);13C NMR (CDCl3,100 MHz)δ:38.8(C-1),27.2 (C-2),79.3 (C-3),39.0 (C-4),55.4(C-5),18.6 (C-6),32.8 (C-7),40.0 (C-8),47.9(C-9),37.2 (C-10),23.8 (C-11),121.9 (C-12),145.5 (C-13),41.9 (C-14),28.7 (C-15),26.3 (C-16),32.9 (C-17),47.5 (C-18),47.1 (C-19),31.4(C-20),34.9 (C-21),37.4 (C-22),28.4 (C-23),15.9 (C-24),15.8(C-25),17.1(C-26),26.4 (C-27),27.5(C-28),33.6(C-29),23.9 (C-30)。以上數(shù)據(jù)與文獻(xiàn)[9]報(bào)道一致,因此確定化合物1 為香樹精(β-amyrin)。
化合物2 白色粉末 mp.120~123 ℃;分子式為C29H48O2;1H NMR (CDCl3,500 MHz)δ:3.70(1H,t,J=11.0 Hz,H-3),2.53 (1H,d,J=13.6 Hz,H-4a),2.42 (1H,t,J=11.7 Hz,H-4b),5.72(1H,s,H-6),2.27 (1H,t,J=11.5 Hz,H-8),2.06(1H,dt,J=12.9 Hz,H-12b),0.71 (3H,s,H-18),1.22 (3H,s,H-19),0.94 (3H,d,J=6.2 Hz,H-21),0.83 (3H,d,J=6.2 Hz,H-26),0.87 (3H,d,J=6.2Hz,H-27),0.84 (3H,t,J=6.2 Hz,H-29);13C NMR (CDCl3,126 MHz)δ:36.6 (C-1),31.4(C-2),70.8 (C-3),42.0 (C-4),165.3 (C-5),126.4 (C-6),202.6 (C-7),45.6 (C-8),50.2 (C-9,C-14),38.5 (C-10),21.4 (C-11),38.9 (C-12),43.3 (C-13),26.5 (C-15),28.8 (C-16),54.9 (C-17),12.2 (C-18,C-29),17.5 (C-19),36.3 (C-20),19.1 (C-21),34.2 (C-22),26.3 (C-23),46.0(C-24),29.3 (C-25),19.3 (C-26),20.0(C-27),23.3(C-28)。以上數(shù)據(jù)與文獻(xiàn)[10]報(bào)道基本一致,因此確定化合物2 為7-酮基-β-谷甾醇(7-keto-β-sitosterol)。
化合物3 白色片狀結(jié)晶 mp.169~170 ℃,分子式為C29H48O;EI-MSm/z412[M]+。其在TLC(展開系統(tǒng):氯仿/丙酮:12∶1、10∶1、8∶1;石油醚/丙酮:15∶1、10∶1、7∶1)上的斑點(diǎn)位置及顯色與豆甾醇標(biāo)準(zhǔn)品的相同,且與標(biāo)準(zhǔn)品混合熔點(diǎn)不下降,因此確定化合物3 為豆甾醇。因此確定化合物3 為豆甾醇(stigmasterol)。
化合物4 白色粉末 mp.157~158 ℃;分子式為C29H50O2;EI-MSm/z430 [M]+;1H NMR(CH3OD,400 MHz)δ:3.59 (1H,m,H-3),5.60(1H,brs,H-6),3.85 (1H,brs,J=7.6Hz,H-7),0.69 (3H,s,H-18),1.07 (3H,s,H-19),0.99 (3H,d,J=6.4 Hz,H-21),0.83 (3H,d,J=7.6 Hz,H-26),0.79 (3H,d,J=7.2 Hz,H-27),0.87(3H,t,J=6.6 Hz,H-29);13C NMR (CH3OD,100 MHz)δ:37.1 (C-1),31.8 (C-2),71.5(C-3),41.9 (C-4),143.7(C-5),125.6 (C-6),73.6 (C-7),39.8 (C-8),48.4 (C-9),36.6 (C-10),21.3 (C-11),41.1(C-12),43.1 (C-13),56.2 (C-14),26.6 (C-15)28.8 (C-16),55.6 (C-17),12.0 (C-18),19.0 (C-19),36.3 (C-20),19.2 (C-21),32.1 (C-22),29.9(C-23),46.0 (C-24),26.3 (C-25),19.4 (C-26),20.0 (C-27),22.9 (C-28),12.2 (C-29)。以上數(shù)據(jù)與文獻(xiàn)[11]報(bào)道一致,因此確定化合物4 為谷甾-5-烯-3β,7β-二醇(stigmast-5-en-3β,7β-diol)。
化合物5 白色粉末 分子式為C33H56O;EI-MSm/z468 [M]+;1H NMR (CDCl3,500 MHz)δ:0.77,0.83,0.87,0.93,0.99,1.07,1.27 (21H,s,7×-CH3),1.53 (3H,s,H-OCH2CH2CH3),2.17(2H,m,H-OCH2CH2CH3),3.16 (1H,dd,J=25.7,16.1 Hz,H-3),3.55 (2H,q,J=6.6 Hz,-OCH2CH2CH3),5.12 (1H,t,J=5.4 Hz,H-12);13C NMR (CDCl3,126 MHz)δ:38.9 (C-1),27.1 (C-2),79.1 (C-3),38.9 (C-4),55.3 (C-5),18.5 (C-6),32.8 (C-7),38.8 (C-8),47.8 (C-9),36.2 (C-10),23.6 (C-11),121.9 (-12),145.3 (C-13),41.9(C-14),26.2 (C-15),27.1 (C-16),32.6 (C-17),47.3 (C-18),46.9 (C-19),31.2 (C-20),34.8 (C-21),37.1 (C-22),28.2 (C-23),15.6 (C-24),15.7(C-25),16.9 (C-26),26.1 (C-27),28.5 (C-28),33.4 (C-29),23.7 (C-30),62.9 (C-1'),25.9 (C-2'),14.2 (C-3')。以上數(shù)據(jù)與文獻(xiàn)[12]報(bào)道基本一致,因此確定化合物5 為丙氧基香樹精(propyloxyamyrin)。
化合物6 白色粉末 分子式為C34H46O18;1H NMR (Pyridine-d5,400 MHz)δ:3.73 (12H,s,4 ×OCH3),5.80 (兩個(gè)端基氫,d,J=7.3Hz),6.88(4H,s,H-2',6',2'',6'');13C NMR (Pyridine-d5,100 MHz)δ:57.0 (4C,4 × OCH3),55.2(2C,C-1,5),86.5 (2C,C-2,6),72.6(2C,C-4,8),135.9 (2C,C-1',1''),105.3(4C,C-2',6',2'',6''),154.3 (4C,C-3',5',3'',5''),138.6(2C,C-4',4''),105.2(2C,C-1-Glc),(2C,C-2-Glc),78.8 (2C,C-3-Glc),76.571.9 (2C,C-4-Glc),79.2 (2C,C-5-Glc),62.9(2C,C-6-Glc)。以上數(shù)據(jù)與文獻(xiàn)[13]報(bào)道基本一致,所以確定化合物6 為鵝掌楸堿(liriodendrin)。
化合物7 白色粉末 分子式為C16H22O8;EI-MSm/z342 [M]+;1H NMR (CH3OD,400MHz)δ:3.89(3H,s,-OCH3),7.09 (1H,d,J=1.9 Hz,H-2),7.12 (1H,d,J=8.4 Hz,H-5),6.95 (1H,dd,J=8.3,1.6 Hz,H-6),6.54 (1H,d,J=15.8 Hz,H-7),6.29 (1H,dt,J=15.8,5.7 Hz,H-8),4.23(2H,d,J=5.7 Hz,H-9a,9b),4.91 (1H,d,J=7.8 Hz,H-1-Glc);13C NMR (CH3OD,100MHz)δ:56.6(C-OCH3),133.6 (C-1),111.3(C-2),151.1(C-3),147.6 (C-4),117.8(C-5),120.7(C-6),131.2 (C-7),128.8(C-8),62.4 (C-9),102.7 (C-1'),74.9 (C-2'),77.8 (C-3'),71.3 (C-4'),78.2(C-5'),63.7(C-6')。以上數(shù)據(jù)與文獻(xiàn)[14]報(bào)道一致,因此確定化合物7 為松柏苷(coniferin)。
化合物8 白色粉末 分子式為C15H20O10;EIMSm/z360 [M]+;1H NMR (CH3OD,400MHz)δ:3.90 (6H,s,2 × OCH3),7.36 (2H,s,H-2,6),5.08 (1H,d,J=7.0 Hz,H-1'),3.78 (1H,dd,J=12.0,5.5 Hz,H-6' a),3.67 (1H,dd,J=12.0,5.5 Hz,H-6'b);13C NMR (CH3OD,100 MHz)δ:57.1(C-OCH3),127.9 (C-1),154.2 (C-3,5),108.7(C-2),140.1(C-4),169.5(C-COOH),104.6(C-1'),75.8 (C-2'),78.6(C-3'),71.4 (C-4'),77.9 (C-5'),62.6(C-6')。以上數(shù)據(jù)與文獻(xiàn)[15]報(bào)道一致,因此確定化合物8 為丁香酸葡萄糖苷(glucosyringic acid)。
化合物9 白色粉末 mp.210 ℃;分子式為C17H24O9;EI-MSm/z372[M]+;1H NMR (CH3OD,600 MHz)δ:3.76 (6H,s,-OCH3),6.76 (2H,H-2,6),6.56 (1H,d,J=15.9Hz,H-7),6.33 (1H,td,J=15.9,10.8,5.4 Hz,H-8),4.22 (2H,dd,J=5.4,1.5 Hz,H-9),4.88 (1H,d,J=7.2 Hz,H-1'),3.22~3.43 (4H,m,H-2',3',4',5'),3.67 (1H,dd,J=12.0,4.0 Hz,H-6'),3.80 (1H,dd,J=12.0,2.0 Hz,H-6');13C NMR(CH3OD,151 MHz)δ:57.1 (-OCH3),135.9 (C-1),154.5 (C-2,6),105.5 (C-3,5),135.4 (C-4),131.4 (C-7),130.1 (C-8),63.7(C-9),105.4 (C-1'),75.8 (C-2'),78.5 (C-3'),71.4 (C-4'),77.9 (C-5'),62.7 (C-6')。以上數(shù)據(jù)與文獻(xiàn)[16]報(bào)道一致,因此確定化合物9 為丁香苷(syringin)。
化合物10 白色粉末 分子式為C9H8O4;EI-MSm/z180 [M]+;1H NMR (CH3OH,600 MHz)δ:6.23 (1H,d,J=15.8 Hz,H-8),6.76 (1H,d,J=8.6 Hz,H-5),6.92 (1H,dd,J=2.1,8.4 Hz,H-6),7.03 (1H,d,J=2.2 Hz,H-2),7.54 (1H,d,J=15.8 Hz,H-7);13C NMR (CH3OH,151 MHz,)δ:127.9 (C-1),115.2 (C-2),146.9 (C-3),149.6 (C-4),116.6 (C-5),123.0 (C-6),147.1(C-7),115.8(C-8),171.3 (C-9)。以上數(shù)據(jù)與文獻(xiàn)[17]報(bào)道一致,因此確定化合物10 為咖啡酸(caffeic acid)。
化合物11 白色粉末 mp.271~273 ℃;分子式為 C9H6O4;EI-MSm/z178 [M]+;1H NMR(CH3OH,600 MHz)δ:6.20 (1H,d,J=9.5 Hz,H-3),7.80 (1H,d,J=9.5 Hz,H-4),6.75 (1H,s,H-5),6.94 (1H,s,H-8);13C NMR (CH3OD,151 MHz)δ:164.5 (C-2),112.6 (C-3),146.3 (C-4),113.1(C-5),144.7 (C-6),152.1 (C-7),103.7 (C-8),150.6 (C-9),112.9 (C-10)。以上數(shù)據(jù)與文獻(xiàn)[18]報(bào)道一致,因此確定化合物11 為6,7-二羥基香豆素(aesculetin)。
化合物12 白色粉末 分子式為C23H46O2;EIMSm/z354 [M]+;1H NMR (CDCl3,400 MHz)δ:2.20 (1H,dd,J=18.4,15.3 Hz,H-2a),2.32(1H,dd,J=14.5,5.9 Hz,H-2b),0.81 (3H,d,J=6.3 Hz,3-CH3),0.93 (3H,d,J=6.6 Hz,7-CH3),0.85 (3H,t,J=6.6 Hz,19-CH3),3.89 (3H,s,-OCH3);13C NMR(CDCl3,100 MHz,)δ:180.1 (C-1),75.9 (C-2),34.1 (C-3),34.2 (C-4),27.4 (C-5),42.3 (C-6),38.4 (C-7),15.7 (C-8),20.9 (C-9),27.9 (C-10),30.8 (C-11),29.9 (C-12),29.8(C-13),29.8 (C-14),29.6 (C-15),29.5 (C-16),29.3 (C-17),32.1 (C-18),22.9 (C-19),13.9 (C-20)。以上數(shù)據(jù)與文獻(xiàn)[19]報(bào)道一致,因此確定化合物12 為(3R)-3,6,7 三甲基十九碳酸甲酯[(3R)-methyl 3,6,7-trimethylnonadecanoate]。
化合物13 淺黃色針晶(氯仿) mp.265~270℃;分子式為C20H16N2O4;1H NMR (DMSO-d6,400 MHz)δ:5.27 (2H,s,H-5),8.68 (1H,s,H-7),8.11 (1H,d,J=8.1 Hz,H-9),7.70 (1H,t,J=7.6 Hz,H-10),7.85 (1H,t,J=7.5 Hz,H-11),8.16(1H,d,J=8.4 Hz,H-12),7.34 (1H,s,H-14),5.42(2H,s,H-17),0.88 (3H,t,J=7.0 Hz,H-18),1.86(2H,m,H-19);13C NMR (DMSO-d6,126 MHz)δ:152.7 (C-2),145.7 (C-3),50.5 (C-5),129.9 (C-6),131.9 (C-7),128.2 (C-8),128.8 (C-9),128.0(C-10),130.8 (C-11),129.2 (C-12),148.1 (C-13),97.2 (C-14),150.4 (C-15),157.2 (C-16a),119.3 (C-16),65.5 (C-17),8.0 (C-18),30.6 (C-19),72.7 (C-20),172.8 (C-21)。以上數(shù)據(jù)與文獻(xiàn)[20]報(bào)道一致,因此確定化合物13 為喜樹堿(camptothecin)。
化合物14 淺黃色針晶(氯仿) mp.255~260℃;分子式為C21H18N2O5;1H NMR (DMSO-d6,400 MHz)δ:4.03 (3H,s,-OCH3),5.24 (2H,s,H-5),8.84 (1H,s,H-7),7.15 (1H,d,J=7.6 Hz,H-10),7.76 (1H,m,H-11),7.71 (1H,d,J=8.5 Hz,H-12),7.31 (1H,s,H-14),5.42 (2H,s,H-17),0.87(3H,t,J=7.3 Hz,H-18),1.86 (2H,m,H-19),6.54(1H,s,-OH);13C NMR (DMSO-d6,125 MHz)δ:56.1 (C-OCH3),152.6 (C-2),145.5 (C-3),50.4(C-5),129.1 (C-6),126.0 (C-7),120.1 (C-8),154.9 (C-9),105.9 (C-10),130.6 (C-11),121.0(C-12),148.8 (C-13),96.7 (C-14),149.9 (C-15),156.8 (C-16a),119.0 (C-16),65.3 (C-17),7.7 (C-18),30.4 (C-19),72.3 (C-20),172.4 (C-21)。以上數(shù)據(jù)與文獻(xiàn)報(bào)道[21]一致,因此確定化合物14 為9-甲氧基喜樹堿(9-methoxycamptothecin)。
化合物15 淺黃色粉末 mp.230~237 ℃;分子式為C20H16N2O5;1H NMR (DMSO-d6,400 MHz)δ:5.21 (2H,s,H-5),8.43 (1H,s,H-7),7.26 (s,1H,H-9),7.40 (1H,d,J=9.0 Hz,H-11),8.00 (1H,d,J=9.1 Hz,H-12),7.24 (1H,s,H-14),5.39 (2H,s,H-17),0.86 (3H,t,J=7.1 Hz,H-18),1.84 (2H,m,H-19);13C NMR (DMSO-d6,100 MHz)δ:149.5(C-2),145.9 (C-3),50.2 (C-5),130.0 (C-6),129.4 (C-7),129.8 (C-8),108.9 (C-9),156.7 (C-10),123.1 (C-11),130.7 (C-12),143.3 (C-13),95.9 (C-14),150.2 (C-15),156.9 (C-16a),118.2(C-16),65.3 (C-17),7.9 (C-18),30.3 (C-19),72.5 (C-20),172.7 (C-21)。以上數(shù)據(jù)與文獻(xiàn)[22]報(bào)道一致,因此確定化合物15 為10-羥基喜樹堿(10-hydroxycamptothecin)。
化合物16 黃色粉末 mp.291~292 ℃;分子式為C17H14O7;1H NMR (DMSO-d6,500 MHz)δ:3.87(6H,s,CH3O-3',5'),6.19 (1H,d,J=1.9 Hz,H-6),6.55 (1H,d,J=1.9 Hz,H-8),6.98 (s,1H,H-3),7.32 (s,2H,H-2',6');13C NMR (DMSO-d6,126 MHz)δ:163.7 (C-2),103.6 (C-3),181.8 (C-4),157.4 (C-5),98.9 (C-6),164.2 (C-7),94.2 (C-8),161.4 (C-9),103.7 (C-10),56.4 (3',5'-OMe),120.4 (C-1'),104.4 (C-2',6'),148.2 (C-3',5'),139.9 (C-4')。以上數(shù)據(jù)與文獻(xiàn)[23]報(bào)道的基本一致,因此確定化合物16 為麥黃酮(tricin)。
化合物17 白色粉末 mp.219~220 ℃;分子式為C29H50O2;EI~MSm/z429 [M]+。1H NMR(CH3OD,400 MHz)δ:3.59 (1H,m,H-3),5.60(1H,d,J=4.8 Hz,H-6),3.85 (1H,brs,H-7),0.68(3H,s,H-18),0.97 (3H,s,H-19),0.93 (3H,t,J=6.4 Hz,H-21),0.83 (3H,d,J=8.0 Hz,H-26),0.80(3H,d,J=8.0 Hz,H-27),0.88(3H,t,J=6.8 Hz,H-29);13C NMR (CH3OD,100 MHz)δ:37.6 (C-1),31.6 (C-2),71.6 (C-3),42.2 (C-4),146.5 (C-5),124.1 (C-6),65.6 (C-7),37.7 (C-8),42.5(C-9),37.2 (C-10),20.9 (C-11),39.4 (C-12),42.3 (C-13),49.6 (C-14),26.1 (C-15),28.5 (C-16),55.9 (C-17),11.8(C-18),18.5(C-19),36.3(C-20),18.9 (C-21),33.9 (C-22),29.9 (C-23),46.0 (C-24),24.5 (C-25),19.2 (C-26),20.0 (C-27),23.2 (C-28),12.2 (C-29)。以上數(shù)據(jù)與文獻(xiàn)[11]報(bào)道一致,因此確定化合物17 為豆甾-5-烯-3β,7α-二醇(stigmast-5-en-3β,7α-diol)。
化合物18 白色粉末(氯仿) mp.283~284℃,分子式為C35H60O6,其1H NMR 和13C NMR 圖譜與β-胡蘿卜苷的標(biāo)準(zhǔn)圖譜完全一致,TLC 上的斑點(diǎn)位置及顯色與β-胡蘿卜苷標(biāo)準(zhǔn)品的相同,且與標(biāo)準(zhǔn)品混合熔點(diǎn)不下降,所以確定化合物18 為β-胡蘿卜苷(daucosterol)。
化合物19 白色針狀結(jié)晶 mp.139~140 ℃,分子式為C29H50O,EI-MSm/z414[M]+,其1H NMR和13C NMR 圖譜與β-谷甾醇的標(biāo)準(zhǔn)圖譜完全一致,TLC 上的斑點(diǎn)位置及顯色與β-谷甾醇標(biāo)準(zhǔn)品的相同,且與標(biāo)準(zhǔn)品混合熔點(diǎn)不下降,因此確定化合物19 為β-谷甾醇(sitosterol)。
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