專利名稱:一種可作藥用的阿拉伯-半乳多糖的活性六糖片段的制備的制作方法
技術(shù)領(lǐng)域:
本發(fā)明是關(guān)于有生物活性的、特別是涉及可作藥用的阿拉伯-半乳多糖的活性六糖片段的制備。
阿拉伯半乳多糖蛋白(AGPs)是一類廣泛分布于植物組織和乳汁中的重要糖蛋白,它們在生物體內(nèi)的作用還不是很清楚,但用單克隆抗體作為對照,表明阿拉伯半乳多糖蛋白的最小決定單元與植物形態(tài)形成中的細(xì)胞發(fā)育有關(guān),而從中草藥Angelica acutiloba和Bupleurum falcatum中提取出的阿拉伯半乳多糖,則是治療婦科疾病和關(guān)節(jié)炎的中草藥的有效成分。
至今尚未有文獻(xiàn)明確地報(bào)導(dǎo)阿拉伯半乳多糖的確切結(jié)構(gòu),但Albersheim的研究組指出這種多糖的活性片段是包含三個(gè)β1-6連接的半乳糖,而且其中一個(gè)半乳糖有一個(gè)α連接的阿拉伯呋喃糖的四糖(P.Albersheim et al,Carbohydrate Research 275,1995,295-307)。為確定寡糖結(jié)構(gòu)-活性的關(guān)系,就要制備各種不同的異構(gòu)體,這些異構(gòu)體還能用于藥物篩選,本發(fā)明即是關(guān)于可作藥用的阿拉伯-半乳多糖的活性六糖片段的簡易制備方法。
本發(fā)明的目的是這樣實(shí)現(xiàn)的,將六糖分為兩個(gè)部分,再將它們縮合。即由三糖供體與三糖受體縮合而得。
本發(fā)明的合成方法在于1.以2,4-二苯甲?;?6-三苯甲基-3-叔丁基二甲基硅基-D-半乳糖異丙硫醇苷為原料,經(jīng)選擇性脫除6位三苯甲基,得到6位為游離羥基的半乳糖單糖受體,將此單糖受體與苯甲?;腄-半乳糖亞胺酯的糖基供體偶聯(lián),得到1-6連接的雙糖,將此雙糖的3位硅烷基脫除,得到3位為游離羥基的雙糖受體,將此雙糖受體與苯甲?;?L-阿拉伯糖亞胺酯的糖基供體偶聯(lián),得到一個(gè)在半乳糖6位連有另一個(gè)D-半乳糖、3位連有一個(gè)L-阿拉伯糖的三糖異丙硫醇苷的三糖供體,如下結(jié)構(gòu)式所示
2.以4,6-芐叉基-D-半乳糖的甲基苷為原料,經(jīng)2位選擇性苯甲?;?,再脫除芐叉基,然后在6位選擇性硅烷化,得到3,4位為游離羥基的單糖受體,將此單糖受體與苯甲酰化的L-阿拉伯糖亞胺酯的糖基供體在3位選擇性偶聯(lián),得到1-3連接的雙糖,將此雙糖的6-位硅烷基脫除,得到4,6位為游離羥基的雙糖受體,將此雙糖受體與6-硅烷基-2,3,4-三苯甲?;?D-半乳糖硫酚苷的糖基供體偶聯(lián),得到在6位連接的三糖,將此三糖?;倜摮沁€原端的糖的6位硅烷基,即得到三糖受體,如下結(jié)構(gòu)式所示 3.將三糖供體與三糖受體在N-碘代丁二酰亞胺-三甲基硅三氟甲磺酸酯的作用下偶聯(lián),得到保護(hù)的六糖,再在甲醇-氨溶液中脫除保護(hù),得到游離的六糖,如下結(jié)構(gòu)式所示 以上結(jié)構(gòu)式中,Tr=三苯甲基,TBDPS=叔丁基二苯基硅烷基Ac=乙?;鵅z=苯甲酰基,Me=甲基以下結(jié)合實(shí)施例進(jìn)行說明。3-氧-叔丁基二甲基硅基-2,4-二-氧-苯甲?;?β-D-半乳吡喃糖異丙硫苷(2)的制備4.24g(5.29mmol)6-氧-三苯甲基-3-氧-叔丁基二甲基硅基-2,4,-二-氧-苯甲酰基-β-D-半乳吡喃糖異丙硫苷(1)溶于1ml二氯甲烷,加入10ml 50~60%的三氟乙酸,室溫下攪拌30分鐘。濃縮除去三氟乙酸(甲苯帶),上柱,用1/3的乙酸乙酯-石油醚淋洗液淋洗,得白色結(jié)晶2.53g(85.5%)。m.p.110~111℃;1H NMR0.005(s,3H,SiCH3),0.16(s,3H,SiCH3),0.74(s,9H,C(CH3)3),1.41(d,3H,CH3),1.44(d,3H,CH3),3.39(m,1H,CH),3.72(q,1H,J6a.6b11.1,J6a.56.3Hz,H-6a),3.93(q,1H,J6b.55.7Hz,H-6b),4.02(t,1H,J5.6a6.2,J5.6b5.7Hz,H-5),4.28(d,1H,J3.26.9,J3.4<1Hz,H-3),4.88(d,1H,J1.29.9Hz,H-1),5.62(d,1H,J3.4<1Hz,H-4),5.73(t,1H,J2.3=J3.49.6Hz,H-2),7.58~8.28(m,10H,PhCO)2,3,4,6-四-氧-苯甲?;?β-D-半乳吡喃糖基-(1→6)-3-氧-叔丁基二甲基硅基-2,4-二-氧-苯甲?;?β-D-半乳吡喃糖異丙硫苷(4)的制備2.00g(3.57mmol)化合物2和2.27g(3.75mmol)2,3,4,6-四-氧-苯甲?;?β-D-半乳吡喃糖基-2,2,2-三氯乙酰亞胺酯(3)混合,在油泵上抽干。在N2氛圍保護(hù)下,加入20ml干燥的二氯甲烷,0℃下攪拌溶解,然后加入40μl TMSOTf(0.05equiv化合物2),攪拌1小時(shí)。三乙胺中和,濃縮,上柱,用1/3的乙酸乙酯-石油醚淋洗液淋洗,得漿狀液體3.44g(84.7%)。1HNMR 0.005(s,3H,SiCH3),0.16(s,3H,SiCH3),0.74(s,9H,C(CH3)3),1.31(d,3H,CH3),1.41(d,3H,CH3),3.12(m,1H,CH),3.99(q,1H,J3.27.6,J3.42.4Hz,H-3A),4.15~4.38(m,3H,J6a.6b10.8,J6a.52.6,J6b.56.7Hz,H-6aA,H-6bA,H-5A),4.44(br t,1H,J5.6b=J5.6a=6.3Hz,H-5B),4.52(q,1H,J6a.56.6,J6a.6b11.0Hz,H-6aB),4.65(q,1H,J6b.56.0,J6a.6b11.0Hz,H-6bB),4.80(d,1H,J1.29.8Hz,H-1A),5.08(d,1H,J1.27.8Hz,H-1B),5.64(br t,1H,J1.29.9,J2.38.2Hz,H-2A),5.72(dd,1H,J2.310.0,J3.43.0Hz,H-3B),5.78(d,1H,J3.43.0Hz,H-4A),5.96(t,1H,J1.2=J2.3=8.1Hz,H-2B),6.13(d,1H,J3.42.8Hz,H-4B),7.37~8.29(m,30H,PhCO).2,3,4,6-四-氧-苯甲酰基-β-D-半乳吡喃糖基-(1→6)-2,4-二-氧-苯甲?;?β-D-半乳吡喃糖異丙硫苷(5)的制備2.50g(2.20mmol)化合物4溶于1ml二氯甲烷,加入10ml 90%的三氟乙酸,室溫下攪拌1小時(shí)。濃縮除去三氟乙酸(甲苯帶),上柱,用1/3的乙酸乙酯-石油醚淋洗液淋洗,得漿狀液體1.72g(76.4%)。1HNMR 1.01(d,3H,CH3),1.06(d,3H,CH3),2.98(m,1H,CH),3.75~3.94(m,3H,J6a.6b10.8Hz,J6a.52.6,J6b.56.7Hz,H-6aA,H-6bA,H-5A),4.04(q,1H,J3.28.1,J3.42.4Hz,H-3A),4.10~4.25(m,2H,J5.6a6.3,J6b.56.0,J6a.6b11.0Hz,H-6aB,H-5B),4.32(q,1H,J6b.56.0,J6a.6b11.0Hz,H-6bB),4.11(d,1H,J1.29.8Hz,H-1A),4.78(d,1H,J1.27.8Hz,H-1B),5.22(br t,1H,J1.29.9,J2.38.2Hz,H-2A),5.45(dd,1H,J2.39.9,J3.42.9Hz,H-3B),5.59(d,1H, J3.43.0Hz,H-4A),5.68(t,1H,J1.2=J2.37.8Hz,H-2B),5.84(d,1H,J3.42.8Hz,H-4B),7.11~8.01(m,30H,PhCO).2,3,4,6-四-氧-苯甲?;?β-D-半乳吡喃糖基-(1→6)-[2,3,5--三-氧-苯甲?;?α-L-阿拉伯糖基-(1→3)]-2,4-二-氧-苯甲酰基-β-D-半乳吡喃糖異丙硫苷(7)的制備1.50g(1.46mmol)化合物5和0.933g(1.54mmol)2,3,5--三-氧-苯甲?;?α-L-阿拉伯糖基-2,2,2-三氯乙酰亞胺酯(6)混合,在油泵上抽干。在N2氛圍保護(hù)下,加入15ml干燥的二氯甲烷,0℃下攪拌溶解,然后加入26μl TMS0Tf(0.1equiv化合物3),攪拌1小時(shí)。三乙胺中和,濃縮,上柱,用1/2的乙酸乙酯-石油醚淋洗液淋洗,得漿狀液體1.68g(78.0%)。1HNMR 1.08(d,3H,CH3),1.17(d,3H,CH3),3.06(m,1H,CH),3.78(q,1H,J6a.6b11.8Hz,J6a.52.7,H-6aA),4.08~4.15(m,2H,J6a.6b11.8Hz,J6a.52.7,J6b.55.8Hz,H-6bA,H-5A),4.18~4.23(m,3H,J2.37.8,J3.43.4,J5.6a6.3,J6b.56.0,J6a.6b10.8Hz,H-3A,H-6aB,H-5B),4.36(q,1H,J6b.56.0,J6a.6b10.8Hz,H-6bB),4.66(d,1H,J1.210.0Hz,H-1A),4.70(dd,1H,J4.5a3.7,J5a.5b12.2Hz,H-5aC),4.84(m,1H,J4.35.7,J4.5a4.6,J4.5b2.8Hz,H-4C),4.87(d,1H,J1.27.9Hz,H-1B),4.93(dd,1H,J4.5b2.8,J5a.5b12.1Hz,H-5bC),5.25(br s,1H,H-2C),5.31(S,1H,H-1C),5.48(br d,1H,J3.45.5Hz,H-3C),5.52(dd,1H,J2.310.4,J3.43.4Hz,H-3B),5.66(t,1H,J1.2=J2.3=9.8Hz,H-2B),5.77(dd,1H,J1.210.3,J2.37.9Hz,H-2A),5.88(d,1H,J3.43.4Hz,H-4A),5.92(d,1H,J3.43.3Hz,H-4B),7.21~8.09(m,45H,PhCO).13CNMR 23.39(CH3),23.78(CH3),35.00(CH),61.68(C-6B),63.27(C-5C),67.93(C-4B),68.19(C-6A),69.68(C-2A),70.18(C-2B),70.58(C-4A),71.15(C-3A),71.73(C-3B),77.10(C-5A),77.54(C-3C),77.66(C-5B),81.57(C-4C),82.52(C-2C),83.56(C-1A),100.99(C-1B),107.67(C-1C),164.61~166.11(9C,PhCO)MS(M+Na)1491.61;(M+K)1507.586-氧-叔丁基二苯基硅基-2,3,4-三-氧-苯甲酰基-β-D-半乳吡喃糖苯硫苷(8)的制備2.20g(8.09mmol)β-D-半乳吡喃糖苯硫苷溶于8ml吡啶中,加入2.70ml叔丁基二苯基氯硅烷,攪拌16小時(shí)。待反應(yīng)完全后,加入3.30ml苯甲酰氯,攪拌反應(yīng)10小時(shí)。濃縮除去吡啶(甲苯帶),上柱,用1/3的乙酸乙酯-石油醚淋洗液淋洗,得漿狀液體4.95g(74.4%)。1HNMR 1.01(s,9H,C(CH3)3),3.79(q,1H,J6a.6b10.1,J6a.57.7Hz,H-6a),3.90(q,1H,J6a.6b10.2,J6b.56.1Hz,H-6b),4.14(brt,1H,J5.6b6.6,J5.6a6.9Hz,H-5),4.98(d,1H,J1.29.5Hz,H-1),5.61(dd,1H,J3.29.8,J3.42.9Hz,H-3),5.68(t,1H,J2.3=J3.4=9.8Hz,H-2),6.0.6(d,1H,J3.42.8Hz,H-4),7.21~7.97(m,30H,PhCO)4,6-氧-異丙叉基-2-氧-苯甲?;?α-D-半乳吡喃糖甲基苷(9)的制備7.00g(29.9mmol)4,6-異丙叉基-α-D-半乳吡喃糖甲基苷溶于25ml吡啶中,加入3.8ml苯甲酰氯(1.05equiv)和20mmg催化劑DMAP,控溫在50~60℃攪拌5小時(shí)。反應(yīng)體系用二氯甲烷和水體系萃取,有機(jī)相用無水硫酸鈉干燥,濃縮干燥液,上柱,用1/3的乙酸乙酯-石油醚淋洗液淋洗,得白色結(jié)晶4.2g(產(chǎn)率41.6%)。1HNMR1.53(s,3H,CH3),1.64(s,3H,CH3),3.48(s,3H,OCH3),3.79(d,2H,J6a.6b<1,J6a.5=J6b.5=6.4Hz,H-6a,H-6b),4.18(br t,1H,J5.6a=J6b.5=6.4,J4.51.7Hz,H-5),4.33(dd,1H,J5.41.7,J3.46.8Hz,H-4),4.55(dd,1H,J3.28.1,J3.46.8Hz,H-3),5.00(d,1H,J1.23.4Hz,H-1),5.14(dd,1H,J1.23.4,J2.38.1Hz,H-2),7.27~8.11(m,5H,PhCO).2-氧-苯甲?;?α-D-半乳吡喃糖甲基苷(10)的制備2.90g(8.58mmol)化合物9溶于1ml二氯甲烷,加入8ml 90%的三氟乙酸,室溫下攪拌30分鐘。待反應(yīng)完全后,濃縮除去三氟乙酸(甲苯帶),上柱,用純乙酸乙酯淋洗,得白色結(jié)晶2.50g(97.6%)。m.p.158~159℃;1HNMR 3.30(s,3H,OCH3),3.78~4.10(br m,5H,J6a.6b10.2,J2.36.6Hz,H-6a,H-6b,H-5,H-4,H-3),4.96(d,1H,J1.23.3Hz,H-1),5.22(dd,1H,J1.23.3,J2.36.6Hz,H-2),7.24~8.01(m,5H,PhCO).6-氧-叔丁基二苯基硅基--2-氧-苯甲?;?-α-D-半乳吡喃糖甲基苷(11)的制備2.50g(8.39mmol)化合物10溶于10ml吡啶中,加入2.8ml叔丁基二苯基氯硅烷和20mmg催化劑DMAP,室溫下攪拌過夜。用二氯甲烷和水體系萃取,有機(jī)相用無水硫酸鈉干燥,濃縮干燥液,上柱,用1/2的乙酸乙酯-石油醚淋洗液淋洗,得漿狀液體4.05g(90.0%)。1HNMR 0.99(s,9H,C(CH3)3),3.23(s,3H,OCH3),3.77(q,1H,J6b.55.2,J6a.54.8Hz,H-5),3.82~3.93(br m,2H,J6b.6a10.8,J6b.56.0,J6a.55.7Hz,H-6b,H-6a),4.03(dd,1H,J3.29.9,J3.43.3Hz,H-3),4.12(d,1H,J3.43.3Hz,H-4),4.93(d,1H,J1.23.6Hz,H-1),5.16(dd,1H,J1.23.6,J2.39.9Hz,H-2),7.16~8.00(m,15H,PhCO).2,3,5--三-氧-苯甲?;?α-L-阿拉伯糖基-(1→3)-6-氧-叔丁基二苯基硅基-2-氧-苯甲?;?α-D-半乳吡喃糖甲基苷(12)的制備2.50g(4.66mmol)化合物11和2.97g(4.90mmol)2,3,5--三-氧-苯甲酰基-α-L-阿拉伯糖基-2,2,2-三氯乙酰亞胺酯(6)混合,在油泵上抽干。在N2氛圍保護(hù)下,加入20ml干燥的二氯甲烷,0℃下攪拌溶解,然后加入42μl TMSOTf(0.05equiv化合物3),攪拌1小時(shí)。三乙胺中和,濃縮,上柱,用1/4的乙酸乙酯-石油醚淋洗液淋洗,得漿狀液體3.28g(71.8%)。1HNMR 0.96(s,9H,C(CH3)3),3.23(s,3H,OCH3),3.75~3.94(br d,3H,J6b.5=J6a.5=5.1,J6b.6a<1J6b.5Hz,H-5D,H-6bD,H-6aD),4.17(d,1H,J3.43.0Hz,H-4D),4.29(dd,1H,J3.210.2,J3.43.0Hz,H-3D),4.48~4.64(m,2H,J5a.5b10.0,J4.5a4.8,J4.5b5.4Hz,H-4F,H-5aF),4.70(dd,1H,J5a.5b10.5,J4.5b5.4Hz,H-5bF),5.09(d,1H,J1.23.6Hz,H-1D),5.34(dd,1H,J1.23.6,J2.310.2Hz,H-2D),5.41(br s,1H,H-2F),5.49(d,1H,J3.43.9Hz,H-3F),5.52(s,1H,H-1F),7.06~8.10(m,30H,PhCO).2,3,5-三-氧-苯甲酰基-α-L-阿拉伯糖基-(1→3)-2-氧-苯甲?;?α-D-半乳吡喃糖甲基苷(13)的制備3.00g(3.06mmol)化合物12溶于1ml二氯甲烷,加入20ml 90%的三氟乙酸,室溫下攪拌1小時(shí)。待反應(yīng)完全后,碳酸氫鈉中和,然后用二氯甲烷和水體系萃取,有機(jī)相用無水硫酸鈉干燥,濃縮干燥液,上柱,用2/3的乙酸乙酯-石油醚淋洗液淋洗,得漿狀液體1.94g(85.5%)。1HNMR 3.31(s,3H,OCH3),3.70~4.00(br m,3H,J6b.5=J6a.5=5.1,J6b.6a9.9Hz,H-5D,H-6bD,H-6aD),4.22(d,1H,J3.43.0Hz,H-4D),4.35(dd,1H,J3.29.9,J3.43.0Hz,H-3D),4.52~4.68(br m,2H,J5a.5b10.0,J4.5a4.8,J4.5b5.4Hz,H-4F,H-5aF),4.74(dd,1H,J5a.5b10.5,J4.5b5.4Hz,H-5bF),5.10(d,1H,J1.23.3Hz,H-1D),5.40(dd,1H,J1.23.3,J2.39.9Hz,H-2D),5.44(br s,1H,H-2F),5.51(br d,1H,J3.43.9Hz,H-3F),5.54(s,1H,H-1F),7.16~8.00(m,30H,PhCO).2,3,5-三-氧-苯甲酰基-α-L-阿拉伯糖基-(1→3)-[6-氧-叔丁基二苯基硅基-2,3,4-三-氧-苯甲?;?β-D-半乳吡喃糖基-(1→6)]--2-氧-苯甲酰基-α-D-半乳吡喃糖甲基苷(14)的制備1.68g(2.26mmol)化合物13和1.96g(2.38mmol)6-氧-叔丁基二苯基硅基-2,3,4-三-氧-苯甲?;?β-D-半乳吡喃糖苯硫苷(8)混合,在油泵上抽干。在N2氛圍保護(hù)下,加入15ml干燥的二氯甲烷,0℃下攪拌溶解,然后加入1.34g NIS,120μlTMS0Tf(0.3equivDonor),攪拌1小時(shí)。三乙胺中和,濃縮,上柱,用2/5的乙酸乙酯-石油醚淋洗液淋洗,得漿狀液體2.31(70.2%)。1HNMR 0.97(s,9H,C(CH3)3),2.87(s,3H,OCH3),3.80~3.90(m,3H,H-6aD,H-6bD,H-6aE),3.97(br d,1H,J5.6a8.3,H-5D),4.07~4.13(m,1H,H-4A,H-5E,H-6bE),4.28(dd,1H,J2.310.5,J3.43.4Hz,H-3D),4.59~4.64(m,2H,J4.5a3.9,J5a.5b12.1Hz,H-5aF,H-4F),4.73(q,1H,J4.5b2.7Hz,H-5bF),4.80(d,1H,J1.23.6Hz,H-1D),4.85(d,1H,J1.27.8Hz,H-1E),5.32(dd,1H,J1.23.6,J2.310.4Hz,H-2D),5.45(br s,1H,H-2F),5.51(s,1H,H-1F),5.53(br d,1H,J3.43.0,H-3F),5.63(dd,1H,J3.43.3,J2.310.4Hz,H-3E),5.72(dd,1H,J1.27.8,J2.310.4Hz,H-2E),6 07(d,1H,J3.42.9Hz,H-4E),7.07~8.03(m,45H,PhCO)2,3,5-三-氧-苯甲?;?α-L-阿拉伯糖基-(1→3)-[6-氧-叔丁基二苯基硅基-2,3,4-三-氧-苯甲酰基-β-D-半乳吡喃糖基-(1→6)]-4-氧-乙?;?2-氧-苯甲?;?α-D-半乳吡喃糖甲基苷(15)的制備1.42g(0.979mmol)化合物14溶于4ml吡啶中,加入2ml乙酸酐,室溫下攪拌約20小時(shí)。濃縮除去吡啶和乙酸酐,上柱,用2/5的乙酸乙酯-石油醚淋洗液淋洗,得漿狀液體1.22g(83.6%)。1HNMR 1.00(s,9H,C(CH3)3),1.87(s,3H,CH3CO),2.92(s,3H,OCH3),3.61(q,1H,J5.6a8.0,J6a.6b10.6Hz,H-6aD),3.78~3.85(m,2H,J6a.6b13.1Hz,H-6aE,H-6bE),3.94(q,1H,J5.6b2.5,J6a.6b10.6Hz,H-6bD),4.07(t,1H,J6b.5=J6a.5=7.4Hz,H-5E),4.14(br d,1H,J5.6a8.0Hz,H-5D),4.44(dd,1H,J2.310.5,J3.43.4Hz,H-3D),4.67(dd,1H,J4.5a3.9,J5a.5b12.1Hz,H-5aF),4.78(m,1H,H-4F),4.83(d,1H,J1.27.8Hz,H-1E),4.85(d,1H,J1.23.6Hz,H-1D),4.90(dd,1H,J4.5b2.7Hz,H-5bF),5.28(dd,1H,J1.23.5,J2.310.6Hz,H-2D),5.36(br s,1H,H-2F),5.45(s,1H,H-1F),5.48~5.54(br d,2H,J5.0,H-4D,H-3F),5.62(dd,1H,J3.43.3,J2.310.4Hz,H-3E),5.69(dd,1H,J1.27.8,J2.310.4Hz,H-2E),6.06(d,1H,J3.42.9Hz,H-4E),7.09~8.06(m,45H,PhCO)2,3,5-三-氧-苯甲?;?α-L-阿拉伯糖基-(1→3)-[2,3,4-三-氧-苯甲酰基-β-D-半乳吡喃糖基-(1→6)]-4-氧-乙?;?-2-氧-苯甲酰基-α-D-半乳吡喃糖甲基苷(16)的制備1.00g(0.668mmol)化合物15溶于0.5ml二氯甲烷,加入10ml 90%的三氟乙酸,室溫下攪拌3小時(shí)。待反應(yīng)完全后,濃縮除去三氟乙酸(甲苯帶),上柱,用2/3的乙酸乙酯-石油醚淋洗液淋洗,得漿狀液體651mg(77.4%)。1HNMR 1.94(s,3H,CH3CO),2.99(s,3H,OCH3),3.64~3.68(m,2H,H-6aD,H-6aE),3.85(dd,1H,J6a.6b11.9,J5.6b6.4,H-6bE),3.96(dd,1H,J5.6b3.1,J6a.6b9.3,H-6bD),4.07(t,1H,J6b.5=J6a.5=7.0Hz,H-5E),4.18(dd,1H,J5.6a=J5.6b=4.6Hz,H-5D),4.46(dd,1H,J2.310.5,J3.43.4Hz,H-3D),4.68(dd,1H,J4.5a3.9,J5a.5b12.1Hz,H-5aF),4.78(m,1H,H-4F),4.85~4.87(q,2H,J1.27.8Hz,J1.23.8Hz,H-1D,H-1E),4.93(dd,1H,J4.5b2.8Hz,H-5bF),5.31(dd,1H,J1.23.6,J2.310.5Hz,H-2D),5.36(s,1H,H-2F),5.46(s,1H,H-1F),5.51(br d,1H,J3.43.7Hz,H-3F),5.57(d,1H,J3.43.3Hz,H-4D),5.58(dd,1H,J3.43.3,J2.310.6Hz,H-3E),5.82~5.87(m,2H,H-2E,H-4E),7.22~8.10(m,35H,PhCO).13CNMR 20.70(CH3CO),55.02(OCH3),60.54(C-6E),63.30(C-5F),68.38(C-5D),68.94(C-4E),69.28(C-6D),69.95(C-2E),70.98(C-4D),71.24(C-2D),71.71(C-3E),71.95(C-3D),74.04(C-5E),77.86(C-3F),81.29(C-4F),82.26(C-2F),97.07(C-1D),101.92(C-1E),107.54(C-1F),164.78~166.83(7C,PhCO),170.24(CH3CO)2,3,4,6-四-氧-苯甲?;?β-D-半乳吡喃糖基-(1→6)-[2,3,5--三-氧-苯甲?;?α-L-阿拉伯糖基-(1→3)]-2,4-二-氧-苯甲?;?β-D-半乳吡喃糖基-(1→6)-2,3,4-三-氧-苯甲?;?β-D-半乳吡喃糖基-(1→6)-[2,3,5--三-氧-苯甲?;?α-L-阿拉伯糖基-(1→3)]-4-氧-乙?;?2-氧-苯甲酰基-α-D-半乳吡喃糖甲基苷(17)的制備600mg(0.477mmol)化合物16和735mg(0.501mmol)化合物7混合,在油泵上抽干。在N2氛圍保護(hù)下,加入10ml干燥的二氯甲烷,0℃下攪拌溶解,然后加入282mgNIS(2.5equivDonor),47μl TMSOTf(0.5equivDonor),攪拌1小時(shí)。三乙胺中和,濃縮,上柱,用2/3的乙酸乙酯-石油醚淋洗液淋洗,得漿狀液體1.05g(83.1%)。1HNMR 1.86(s,3H,CH3CO),2.93(s,3H,OCH3),3.33(dd,1H,J5.6b2.7.1,J6a.6b11.8,H-6aA),3.58(dd,1H,J6a.6b9.3,J5.6a8.0,H-6aD),3.75~3.92(m,5H,H-6aE,H-6bE,H-5E,H-6aB,H-6bD),3.95(dd,1H,J5.6b5.8,H-6bA),4.02~4.15(m,5H,H-3A,H-5AH-5B,H-6bB,H-5D),4.44(dd,1H,J2.310.5,J3.43.4Hz,H-3D),4.51(d,1H,J1.28.0Hz,H-1A),4.54(d,1H,J1.27.8Hz,H-1B),4.66(dd,1H,J4.5a3.9,J5a.5b12.1Hz,H-5aF),4.72~4.85(br,4H,H-1D,H-1E,H-5aC,H-4F),4.91(dd,1H,J4.5b2.8Hz,H-5bF),4.98~5.05(br,2H,H-5bC,H-4C),5.24~5.29(m,3H,H-1C,H-2C,H-2D),5.36(s,1H,H-2F),5.44(s,1H,H-1F),5.46~5.62(m,6H,H-2A,H-3B,H-3C,H-4D,H-3E,H-3F),5.64~5.68(m,2H,H-2B,H-2E),5.81~5.84(m,2 H,H-4A,H-4B),5.96(d,1H,H-4E),7.21~8.21(m,80H,PhCO).13CNMR 20.61(CH3CO),54.89(OCH3),61.22(C-6B),63.22(C-5F),63.37(C-5C),66.36(C-6A),66.46(C-6E),67.75(C-4B),67.99(C-4E),68.28(C-5D),68.69(C-6D),69.44(C-4A),69.87(C-2B),69.92(C-2E),70.76(C-3B),70.90(C-3A),71.24(C-2D),71.61(C-3E),71.68(2C,C-2A,C-4D),71.92(C-3D),72.40(C-5A),72.57(C-5E),76.40(C-5B),77.65(C-3F),77.81(C-3C),81.18(C-4F),81.64(C-4C),82.28(C-2F),81.82.61(C-2F),97.93(C-1D),100.79(C-1B),100.94(C-1A),101.60(C-1E),107.50(C-1F),107.68(C-1C),164.62~166.18(16C,PhCO),169.91(CH3CO)β-D-半乳吡喃糖基-(1→6)-[α-L-阿拉伯糖基-(1→3)]-β-D-半乳吡喃糖基-(1→6)-β-D-半乳吡喃糖基-(1→6)-[α-L-阿拉伯糖基-(1→3)]-α-D-半乳吡喃糖甲基苷(18)的制備1.05g化合物17溶于20ml無水甲醇中,通入氨氣至飽和(反應(yīng)體系由冷變熱,再變冷即可)。然后,靜止放置7天,濃縮,用純甲醇在葡萄糖凝膠LH-20柱淋洗,得白色固體213mg,產(chǎn)率86%。[α]D25=-8.3°(c3.1,H2O),1H NMR(D2O,400MHz)δ3.25-4.27,4.35,4.52,4.57,5.27,5.23,5.17。
權(quán)利要求
1.一種可作藥用的阿拉伯-半乳多糖的活性六糖片段的制備方法,其特征在于以2,4-二苯甲?;?6-三苯甲基-3-叔丁基二甲基硅基-D-半乳糖異丙硫醇苷為原料,經(jīng)選擇性脫除6位三苯甲基,得到6位為游離羥基的半乳糖單糖受體,將此單糖受體與苯甲?;腄-半乳糖亞胺酯的糖基供體偶聯(lián),得到1-6連接的雙糖,將此雙糖的3位硅烷基脫除,得到3位為游離羥基的雙糖受體,將此雙糖受體與苯甲?;?L-阿拉伯糖亞胺酯的糖基供體偶聯(lián),得到一個(gè)在半乳糖6位連有另一個(gè)D-半乳糖、3位連有一個(gè)L-阿拉伯糖的三糖異丙硫醇苷的三糖供體,如下結(jié)構(gòu)式所示
2.以4,6-芐叉基-D-半乳糖的甲基苷為原料,經(jīng)2位選擇性苯甲酰化,再脫除芐叉基,然后在6位選擇性硅烷化,得到3,4位為游離羥基的單糖受體,將此單糖受體與苯甲?;腖-阿拉伯糖亞胺酯的糖基供體在3位選擇性偶聯(lián),得到1-3連接的雙糖,將此雙糖的6-位硅烷基脫除,得到4,6位為游離羥基的雙糖受體,將此雙糖受體與6-硅烷基-2,3,4-三苯甲?;?D-半乳糖硫酚苷的糖基供體偶聯(lián),得到在6位連接的三糖,將此三糖?;?,再脫除非還原端的糖的6位硅烷基,即得到三糖受體,如下結(jié)構(gòu)式所示
3.將三糖供體與三糖受體在N-碘代丁二酰亞胺-三甲基硅三氟甲磺酸酯的作用下偶聯(lián),得到保護(hù)的六糖,再在甲醇-氨溶液中脫除保護(hù),得到游離的六糖,如下結(jié)構(gòu)式所示 以上結(jié)構(gòu)式中,Tr=三苯甲基,TBDPS=叔丁基二苯基硅烷基Ac=乙?;鵅z=苯甲?;琈e=甲基
全文摘要
本發(fā)明是關(guān)于有生物活性的、特別是涉及可作藥用的阿拉伯-半乳多糖的活性六糖片段的合成。該活性片段的主鏈?zhǔn)?-6β-連接的D-半乳四糖,在主鏈還原端半乳糖及另一個(gè)半乳糖的3位連有α-連接的L-阿拉伯呋喃糖,這樣的活性片段可用三糖與三糖縮合的策略制備。
文檔編號C08B37/00GK1369509SQ0110371
公開日2002年9月18日 申請日期2001年2月12日 優(yōu)先權(quán)日2001年2月12日
發(fā)明者杜宇國, 顧國鋒, 楊鋒, 孔繁祚 申請人:中國科學(xué)院生態(tài)環(huán)境研究中心