CN113929736B - Gly-Pro-Arg-Pro-氧乙氨羰基华法林,其合成,活性和应用 - Google Patents
Gly-Pro-Arg-Pro-氧乙氨羰基华法林,其合成,活性和应用 Download PDFInfo
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Classifications
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- C—CHEMISTRY; METALLURGY
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- C07K5/04—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof containing only normal peptide links
- C07K5/10—Tetrapeptides
- C07K5/1002—Tetrapeptides with the first amino acid being neutral
- C07K5/1005—Tetrapeptides with the first amino acid being neutral and aliphatic
- C07K5/1008—Tetrapeptides with the first amino acid being neutral and aliphatic the side chain containing 0 or 1 carbon atoms, i.e. Gly, Ala
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- A61K31/33—Heterocyclic compounds
- A61K31/335—Heterocyclic compounds having oxygen as the only ring hetero atom, e.g. fungichromin
- A61K31/365—Lactones
- A61K31/366—Lactones having six-membered rings, e.g. delta-lactones
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- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
- A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
- A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
- A61K47/62—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being a protein, peptide or polyamino acid
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P7/00—Drugs for disorders of the blood or the extracellular fluid
- A61P7/02—Antithrombotic agents; Anticoagulants; Platelet aggregation inhibitors
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- Health & Medical Sciences (AREA)
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Abstract
本发明公开了下式的Gly‑Pro‑Arg‑Pro‑氧乙氨羰基华法林,公开了它的制备方法,公开了它的抗静脉血栓活性,公开了它无出血副作用的优点。同时公开了它降低血浆凝血因子II及可溶性纤维蛋白单体复合物含量的活性。因而本发明公开了它在制备无出血副作用的抗静脉血栓药物中的应用,公开了它在制备凝血因子II拮抗剂中的应用以及在制备可溶性纤维蛋白单体复合物拮抗剂中的应用。
Description
技术领域
本发明涉及一种Gly-Pro-Arg-Pro-氧乙氨羰基华法林,涉及它的制备方法,涉及它的抗静脉血栓活性,涉及它无出血副作用的优点。同时涉及它降低血浆凝血因子II及可溶性纤维蛋白单体复合物含量的活性。因而本发明涉及它在制备无出血副作用的抗静脉血栓药物中的应用,涉及它在制备凝血因子II拮抗剂中的应用以及涉及它在制备可溶性纤维蛋白单体复合物拮抗剂中的应用。本发明属于生物医药领域。
背景技术
血栓性疾病是严重威胁人类生命健康的病症,具有发病率高与致死率高的特点。根据血栓块形成位置的不同,血栓性疾病可分为动脉血栓栓塞疾病与静脉血栓栓塞疾病两类,其中静脉血栓栓塞性疾病(VTE)是最为多见的血栓性疾病,其主要病症包括深静脉血栓(DVT)与肺栓塞(PE),PE所造成的死亡率很高,而DVT若疏于防范,也可带来严重的并发症。VTE的主要临床治疗方案为使用抗凝药物进行抗凝治疗,以华法林为代表的维生素K1拮抗剂是最常用的抗凝药物之一,但华法林具有个体用药剂量差异大、出血副作用严重及病人依从性差等缺点。针对华法林这些不足,发明人曾经公开一类修饰的华法林(CN 107488157A,CN 107488211 A,CN 107488214 A,CN 107488212 A,CN 107488213 A,CN 107488210 A,CN 107474030 A)。可是,它们都是维生素K的抑制剂,对血栓形成过程中起重要作用的可溶性纤维蛋白单体复合物没有作用。为了克服这类修饰的华法林在这方面的不足,发明人又展开了不同目标的研究与探索。后来发现Gly-Pro-Arg-Pro-氧乙氨羰基华法林对维生素K没有影响,而是作用于对血栓形成过程中起重要作用的可溶性纤维蛋白单体复合物的抗静脉血栓剂。根据这些发现,发明人提出了本发明。
发明内容
本发明的第一个内容是提供下式的Gly-Pro-Arg-Pro-氧乙氨羰基华法林。
本发明的第二个内容是提供Gly-Pro-Arg-Pro-氧乙氨羰基华法林的制备方法,该方法包括:
1)合成华法林-4-O-乙酸苄酯;
2)合成华法林-4-O-乙酸;
3)乙醇胺与华法林-4-O-乙酸反应合成羟基乙酰胺基华法林;
4)羟基乙酰胺基华法林与Cbz-Pro反应合成Cbz-Pro-氧乙氨羰基华法林;
5)Cbz-Pro-氧乙氨羰基华法林转化为Pro-氧乙氨羰基华法林;
6)合成Cbz-Gly-Pro-Arg(NO2)-OBzl;
7)Cbz-Gly-Pro-Arg(NO2)-OBzl转化为Cbz-Gly-Pro-Arg(NO2);
8)Pro-氧乙氨羰基华法林与Cbz-Gly-Pro-Arg(NO2)反应合成Cbz-Gly-Pro-Arg(NO2)-Pro-氧乙氨羰基华法林;
9)Cbz-Gly-Pro-Arg(NO2)-Pro-氧乙氨羰基华法林转化为权利要求1的Gly-Pro-Arg-Pro-氧乙氨羰基华法林。
本发明的第三个内容是评价Gly-Pro-Arg-Pro-氧乙氨羰基华法林的抗静脉血栓作用。
本发明的第四个内容是评价Gly-Pro-Arg-Pro-氧乙氨羰基华法林对出血时间的影响。
本发明的第五个内容是评价Gly-Pro-Arg-Pro-氧乙氨羰基华法林对凝血时间的影响。
本发明的第六个内容是评价Gly-Pro-Arg-Pro-氧乙氨羰基华法林对国际标准化比值的影响。
本发明的第七个内容是评价Gly-Pro-Arg-Pro-氧乙氨羰基华法林对血浆凝血因子II含量的影响。
本发明的第八个内容是评价Gly-Pro-Arg-Pro-氧乙氨羰基华法林对血浆可溶性纤维蛋白单体复合物含量的影响。
附图说明
图1.Gly-Pro-Arg-Pro-氧乙氨羰基华法林的合成路线.(i)溴-2-乙酸苄酯,丙酮,K2CO3,45℃;(ii)CH3OH,Pd/C,H2;(iii)二环己基碳二亚胺,1-羟基苯并三唑,N-甲基吗啉,四氢呋喃;(iv)二环己基碳二亚胺,4-二甲氨基吡啶,N-甲基吗啉,四氢呋喃;(v)丙酮,氢氧化钠溶液(2N)。
具体实施方式
为了进一步阐述本发明,下面给出一系列实施例。这些实施例完全是例证性的,它们仅用来对本发明进行具体描述,不应当理解为对本发明的限制。
实施例1制备华法林-4-O-乙酸苄酯(1)
将26.48g(80.00mmol)华法林分散于400mL丙酮中,45℃搅拌至华法林溶解,向反应液中加入12.1g(88.0mmol)K2CO3,而后加入14mL(88mmol)溴乙酸苄酯,继续于45℃反应96小时,TLC(石油醚/乙酸乙酯,2/1)显示华法林点消失,于是终止反应,过滤,滤液减压浓缩,得到的淡黄色油状物用硅胶柱层析纯化(石油醚/乙酸乙酯,8/1)得到19.77g(54%)标题化合物,为无色固体。ESI-MS(m/e):457[M+H]+;1H NMR(300MHz,DMSO-d6)δ/ppm=7.89(dd,J1=3.0Hz,J2=9.0Hz,1H),7.63(dt,J1=3.0Hz,J2=9.0Hz,1H),7.43~7.31(m,9H),7.24(t,J=9.0Hz,2H),7.15(tt,J=9.0Hz,1H),5.26(s,2H),5.61(s,1H),5.02(d,J=15.0Hz,1H),4.85(d,J=15.0Hz,1H),4.97(t,J=9.0Hz,1H),3.45(dq,J1=9.0Hz,J2=18.0Hz,2H),2.11(s,3H)。
实施例2制备华法林-4-O-乙酸(2)
将19.77g(43.36mmol)华法林-4-O-乙酸苄酯(1)溶于150mL四氢呋喃中,加入4.94g Pd/C,搅拌,抽去空气通入氢气,室温搅拌72小时。TLC(石油醚/乙酸乙酯,2/1)显示化合物1消失,于是终止反应,过滤,滤液减压浓缩,得到15.58g(98.2%)标题化合物,为无色固体。ESI-MS(m/e):367[M+H]+;1H-NMR(300MHz,DMSO-d6):δ/ppm=12.86(s,1H),7.90(d,J=6.0Hz,1H),7.63(t,J=6.0Hz,1H),7.43~7.34(m,4H),7.27(t,J=9.0Hz,2H),7.17(t,J=9.0Hz,1H),4.99(t,J=9.0Hz,1H),4.75(dd,J1=15.0Hz,J2=30.0Hz,2H),3.54~3.47(m,2H),2.14(s,3H)。
实施例3制备羟基乙酰胺基华法林(3)
将1.21g(3.31mmol)华法林-4-O-乙酸(2)溶解于20mL四氢呋喃,于0℃加入0.445g(3.30mmol)1-羟基苯并三唑搅拌10分钟,加入0.742g(3.60mmol)二环己基碳二亚胺,0℃搅拌活化30分钟。而后将0.18mL(3.0mmol)乙醇胺于0℃加到反应液中,用N-甲基吗啉调节反应液pH值到9,室温搅拌20小时,TLC(石油醚/乙酸乙酯,2/1)显示化合物2消失,过滤,滤液减压浓缩,得到的残留物用60mL乙酸乙酯溶解后用饱和NaHCO3水溶液洗(40mL×3),饱和NaCl水溶液洗(40mL×3),5%KHSO4水溶液洗(40mL×3),饱和NaCl水溶液洗(40mL×3),饱和NaHCO3水溶液洗(40mL×3),饱和NaCl水溶液洗(40mL×3),乙酸乙酯相用无水Na2SO4干燥6小时,过滤,滤液减压浓缩,得到的无色固体用硅胶柱层析纯化(石油醚/乙酸乙酯,4/1),得到0.76g(62%)标题化合物,为无色固体。1H NMR(300MHz,DMSO-d6)=8.35(m,1H),7.85(m,1H),7.64(m,1H),7.42(m,2H),7.36(m,2H),7.26(t,J=7.2Hz,2H),7.17(m,1H),4.89(t,J=7.5Hz,1H),4.77(t,J=5.4Hz,1H),4.52(s,2H),3.49(m,4H),3.27(m,2H),2.14(s,3H)。
实施例4制备Cbz-Pro-氧乙氨羰基华法林(4)
将0.501g(2.01mmol)Cbz-Pro溶解于25mL四氢呋喃中,于0℃加入0.060g(0.49mmol)4-二甲氨基吡啶并搅拌10分钟,加0.410g(1.99mmol)二环己基碳二亚胺,继续搅拌30分钟。而后将0.600g(1.47mmol)羟基乙酰胺基华法林(3)于0℃加到反应液中,用N-甲基吗啉调节反应液pH值到9,室温搅拌18小时,TLC(二氯甲烷/甲醇,20/1)显示化合物3消失;过滤,滤液减压浓缩,残留物用50mL乙酸乙酯溶解后用饱和NaHCO3水溶液洗(40mL×3),饱和NaCl水溶液洗(40mL×3),5%KHSO4水溶液洗(40mL×3),饱和NaCl水溶液洗(40mL×3),饱和NaHCO3水溶液洗(40mL×3),饱和NaCl水溶液洗(40mL×3),乙酸乙酯相用无水Na2SO4干燥6小时,过滤,滤液减压浓缩,得到的淡黄色油状物用硅胶柱层析纯化(石油醚/乙酸乙酯,3/1),得到0.70g(75%)标题化合物,为无色固体。1H NMR(300MHz,DMSO-d6)=8.51(m,1H),7.81(m,1H),7.63(m,1H),7.41(m,2H),7.30(m,7H),7.26(m,2H),7.18(m,1H),5.00(m,2H),4.89(t,J=7.5Hz,1H),4.50(m,2H),4.22(m,3H),3.46(d,J=7.5Hz,2H),3.40(m,4H),2.13(s,3H),2.30~1.80(m,4H)。
实施例5制备Pro-氧乙氨羰基华法林(5)
采用实施例2的方法从0.64g(1.0mmol)Cbz-Pro-氧乙氨羰基华法林(4)得到0.51g(100%)标题化合物,为淡黄色油状物。ESI-MS(m/e):506[M+H]+。
实施例6制备Cbz-Gly-Pro-OBzl
采用实施例4的方法从2.573g(12.31mmol)Cbz-Gly和2.705g(11.20mmol)HCl·Pro-OBzl得到3.58g(81%)标题化合物,为淡黄色油状物。ESI-MS(m/e):397[M+H]+。
实施例7制备Cbz-Gly-Pro
将3.58g Cbz-Gly-Pro-OBzl溶解于20mL丙酮中,0℃向反应液中滴入浓度为2N的氢氧化钠水溶液,将反应液的pH调节至13,持续搅拌4小时。TLC(二氯甲烷/甲醇,20/1+3d冰醋酸)显示原料点消失。反应液于0℃用饱和KHSO4水溶液调节pH为7,减压浓缩,残留物用3mL H2O溶解,用饱和KHSO4水溶液将溶液pH调至2,而后用乙酸乙酯萃取(30mL×4),乙酸乙酯相用无水Na2SO4干燥6小时,过滤,滤液减压浓缩,得到2.62g(95%)标题化合物,为淡黄色油状物。ESI-MS(m/e):305[M-H]-。
实施例8制备Cbz-Gly-Pro-Arg(NO2)-OBzl
采用实施例4的方法从1.60g(5.23mmol)和2.16g(4.49mmol)Tos·Arg(NO2)-OBzl得到2.12g(79%)标题化合物,为无色固体。1H NMR(300MHz,DMSO-d6)=8.51(m,1H),8.35(d,J=7.1Hz,1H),7.35(s,10H),5.11(m,2H),5.02(m,2H),4.35(m,1H),4.26(m,1H),3.82(m,2H),3.45(m,2H),3.14(m,2H),2.00~1.54(m,8H)。
实施例9制备Cbz-Gly-Pro-Arg(NO2)
采用实施例7的方法从0.657g(1.10mmol)Cbz-Gly-Pro-Arg(NO2)-OBzl得到0.558g(100%)标题化合物,为无色油状物。ESI-MS(m/e):461[M-H]-。
实施例10制备Cbz-Gly-Pro-Arg(NO2)-Pro-氧乙氨羰基华法林(6)
采用实施例4的方法从0.558g(1.21mmol)Cbz-Gly-Pro-Arg(NO2)和0.506g(1.00mmol)Pro-氧乙氨羰基华法林(5)得到0.213g(21%)标题化合物,为无色固体。1H NMR(300MHz,DMSO-d6)=8.47(m,1H),8.11(d,J=4.5Hz,1H),7.80(d,J=4.8Hz,1H),7.61(t,J=4.5Hz,1H),7.40(m,2H),7.32(m,5H),7.30(m,2H),7.24(t,J=4.5Hz,2H),7.16(m,1H),4.99(m,2H),4.86(t,J=4.5Hz,1H),4.49(m,2H),4.43(m,1H),4.29(m,2H),4.19(m,1H),4.08(m,1H),3.80(m,2H),3.60(m,1H),3.55~3.40(m,5H),3.44(d,J=4.5Hz,2H),3.13(s,2H),2.12(s,3H),1.97~1.54(m,12H)。
实施例11制备Gly-Pro-Arg-Pro-氧乙基氨基羰基华法林(7)
采用实施例2的方法从150mg(0.15mmol)Cbz-Gly-Pro-Arg(NO2)-Pro-氧乙氨羰基华法林(6)得到35mg(29%)标题化合物,为无色固体。ESI-MS(m/e):817[M+H]+; (c=0.11,CH3OH);M.p.159.6-160℃;IR(cm-1):3287.11,2957.78,1714.91,1633.69,1537.90,1446.83,1365.68,1278.78,1177.05,1099.42,915.52,827.32,757.70,700.60;1H NMR(500MHz,DMSO-d6):δ/ppm=10.30(m,1H),8.50(m,1H),7.80(d,J=7.8Hz,1H),7.62(m,1H),7.42~7.38(m,3H),7.82(m,2H),7.24(m,3H),7.15(m,1H),4.87(t,J=7.5Hz,0.58H),4.80(t,J=6.9Hz,0.41H),4.50(m,2H),4.43~4.28(m,3H),4.19(m,2H),4.08(m,2H),3.79(m,1H),3.63~3.78(m,4H),3.39(d,J=7.4Hz,2H),3.09(m,2H),3.00(m,1H),2.92(m,1H),2.12(s,3H),1.85~1.63(m,9H),1.54~1.46(m,3H)。
实施例12评价Gly-Pro-Arg-Pro-氧乙氨羰基华法林(7)的抗静脉血栓作用
实验材料
乌拉坦(氨基甲酸乙酯,CAS:51-79-6,国药集团化学试剂有限公司),华法林钠(CAS:129-06-6,百灵威科技有限公司)。
实验动物
雄性SD大鼠(250±20g),购自北京维通利华实验动物技术有限公司。评价时用于制备大鼠下腔静脉结扎模型。
给药剂量
本发明的Gly-Pro-Arg-Pro-氧乙氨羰基华法林(7)溶解于生理盐水,剂量为0.82μmol/kg;阳性对照华法林溶解于生理盐水,剂量为0.82μmol/kg;阴性对照为生理盐水。
实验操作
大鼠在手术前适应环境并禁食一天,大鼠灌胃给予化合物7的生理盐水溶液,剂量为0.82μmol/kg;或者华法林的生理盐水溶液,剂量为0.82μmol/kg;或者生理盐水。给药30分钟后于手术前2分钟大鼠用20%乌拉坦溶液腹腔给药麻醉。然后固定于大鼠固定板上,腹部备皮且消毒,然后沿腹白线打开腹腔,上至露出肝脏一角,开口大小约4cm长即可。移开腹腔内小肠等器官并用浸润过生理盐水的纱布包裹。钝性分离血管周围结缔组织,暴露下腔静脉及其分支,在左肾静脉下方将腹主动脉和下腔静脉剥离开,然后用生理盐水浸湿的缝合线在下腔静脉与左肾静脉交汇处将下腔静脉结扎,按解剖位置将肠等器官移回腹腔,用缝合线逐层缝合腹腔后将大鼠置于25~28℃的环境中循环4天。之后接受乙醚麻醉,打开腹腔,逐个将下腔静脉的各个分支血管结扎,从下腔静脉与左肾静脉的交汇处的结扎处开始取出2cm下腔静脉,从中取出血栓。血液留作测定凝血因子II,组织因子/凝血因子VII以及可溶性纤维蛋白单体复合物的样品。血栓称重并利用T检验的方式统计结果。手术以每组四只交替进行。血栓重见表1。
表1治疗大鼠的静脉血栓重
a)与生理盐水比,P<0.01;n=8
表1的数据表明,在0.82μmol/kg口服剂量下化合物7连续治疗4天可有效地抑制大鼠静脉血栓。可见,本发明有显著的技术效果。
实施例13评价Gly-Pro-Arg-Pro-氧乙氨羰基华法林(7)对出血时间的影响
实施例12的大鼠在取栓前接受麻醉,而后在大鼠的距鼠尾8cm处用手术刀开一个2mm深的创口,同时开始计时,每5秒钟用滤纸将血拭去,在滤纸上不能看到任何血迹的时候停止计时,所记的时间为大鼠尾出血时间。出血时间用T检验的方式统计结果。手术以每组四只交替进行。出血时间见表2。
表2治疗大鼠的出血时间
a)与生理盐水比,P<0.01;n=11
表2的数据表明,在0.82μmol/kg的口服剂量下,化合物7连续给药4天,大鼠的鼠尾出血时间与生理盐水治疗的大鼠没有差异。在0.82μmol/kg的口服剂量下,华法林连续给药4天,大鼠的尾出血时间显长于生理盐水治疗大鼠的尾出血时间,显示明显的出血副作用。化合物7没有造成与华法林类似的出血事件,比华法林安全。可见,本发明有意想不到的技术效果。
实施例14评价Gly-Pro-Arg-Pro-氧乙氨羰基华法林(7)对大鼠凝血时间的影响
实施例12的大鼠在取栓前接受麻醉,令其腹部朝下卧于鼠板上,用蘸有医用酒精的脱脂棉球擦拭鼠尾以消毒,用直尺从大鼠鼠尾尖部量取8cm并做出标记,约为大鼠鼠尾中部的位置找到位于鼠尾正中处的血管,用手术刀片割出长约5mm,深约2mm的创口,待有血液流出时立刻用玻璃板取一滴血液并开始计时。而后用注射器针尖反复挑动血滴,频率约为2次/秒,直至针尖可以挑出细丝状血栓则停止计时,由此得到的时间即为大鼠凝血时间。得到的凝血时间利用t检验的方式统计结果。手术以每组四只交替进行。凝血时间见表3。
表3治疗大鼠的凝血时间
a)与生理盐水比,P<0.01;n=10
表3的数据表明,在0.82μmol/kg的口服剂量下化合物7连续治疗4天,大鼠的鼠尾凝血时间与生理盐水治疗的大鼠没有差异,然而在0.82μmol/kg的口服剂量下华法林经连续治疗4天,大鼠的尾凝血时间明显长于生理盐水治疗大鼠的尾凝血时间,显示明显的出血副作用。化合物7没有造成与华法林类似的出血事件,比华法林安全。可见,本发明有意想不到的技术效果。
实施例15评价Gly-Pro-Arg-Pro-氧乙氨羰基华法林(7)对大鼠国际标准化比值的影响国际标准化比值反映凝血酶原时间,可由半自动血凝仪(型号TS6000,MD Pacific)自动计算得出。具体测试方法为,实施例12采集的大鼠的全血3.6mL/只,置于装有0.4mL枸橼酸钠溶液(3.8%)的离心管中,于2500g离心15分钟后,吸取上层贫血小板血浆(PPP),于测试杯中加入100μL PPP,再加入一粒测试磁珠,将待测样品于仪器的预温区中预温180秒,而后加入200μL凝血酶原时间测试液(试剂盒货号:20-7011,MD Pacific),仪器开始自动检测得出凝血酶原时间,并自动计算国际标准化比值,用T检验的方式统计结果,国际标准化比值见表4。
表4治疗大鼠的国际标准化比值
a)与生理盐水比,P<0.01;n=10
表4的数据表明,在0.82μmol/kg的口服剂量下化合物7连续治疗4天,大鼠的国际标准化比值与生理盐水治疗的大鼠没有差异,然而在0.82μmol/kg的口服剂量下华法林经连续治疗4天,大鼠的国际标准化比值明显大于生理盐水治疗大鼠的国际标准化比值,显示明显的出血副作用。化合物7没有造成与华法林类似的出血事件,比华法林安全。可见,本发明有意想不到的技术效果。
实施例16评价Gly-Pro-Arg-Pro-氧乙基氨基羰基华法林(7)对大鼠血浆凝血因子II(FIIa)含量的影响
实施例12采集的大鼠的全血4.0mL/只,置于装有0.4mL枸橼酸钠溶液(3.8%)的离心管中,于1000g离心15分钟后,吸取上层贫血小板血浆(PPP)。每个实验组取6只给药后大鼠的PPP样本,使用试剂盒内标本稀释液1:1稀释后加入50ul于反应孔内。同时加入稀释的标准品50μL于反应孔内。立即加入50μL的生物素标记的抗体。盖上膜板,轻轻振荡混匀,37℃温育1小时。而后甩去孔内液体,每孔加满洗涤液,振荡30秒,甩去洗涤液,用吸水纸拍干。重复此操作3次。接着每孔加入80μL的亲和链酶素-HRP,轻轻振荡混匀,37℃温育30分钟。孵育结束后甩去孔内液体,每孔加满洗涤液,振荡30秒,甩去洗涤液,用吸水纸拍干,重复此操作3次。每孔加入底物A、B各50μL,轻轻振荡混匀,37℃温育10分钟。避免光照,然后取出酶标板,迅速加入50μL终止液,加入终止液后应立即测定结果,在450nm波长处使用酶标仪测定各孔的OD值。而后使用450nm处读取的OD值减去540nm处读取的OD值,并以此值为纵坐标,凝血因子II(FIIa)标准品浓度为横坐标,绘得标准曲线,样品的FIIa含量可根据其OD值由标准曲线换算出相应的浓度。利用SPSS22.0中单因素方差分析(ANOVA one-way,LSD)的方法分析各组FIIa含量的差异,大鼠血浆中的FIIa含量如表5所示。
表5治疗大鼠血浆中的FIIa含量
a)与NS相比,P<0.01;n=5
表5的结果表明,在0.82μmol/kg口服剂量下化合物7连续口服给药4天后,可有效地降低大鼠血浆FIIa的含量,本发明有显著的技术效果。
实施例17评价Gly-Pro-Arg-Pro-氧乙氨羰基华法林(7)对大鼠血浆可溶性纤维蛋白单体复合物(SFMC)含量的影响
实施例12采集的大鼠的全血4.0mL/只,置于装有0.4mL枸橼酸钠溶液(3.8%)的离心管中,于1000g离心15分钟后,吸取上层贫血小板血浆(PPP)。每个实验组取6只给药后大鼠的PPP样本,使用试剂盒内样品稀释液将PPP样本稀释200倍后,每孔加入100μL各样本及标准品,覆上盖板膜后37℃孵育2小时,之后倾倒板内所有液体,不洗板,直接于每孔中加入100μL Biotin溶液,覆上新的盖板膜后于37℃孵育1小时。而后弃去板内液体,每孔加入200μL洗液,静置2min后弃去洗液并拍干96孔板,如此重复3次。接着每孔加入100μL HRP-avidin覆上新的盖板膜后于37℃再孵育1小时。孵育结束后上述洗板操作重复5次,除净各孔内液体。每孔加入90μL 3,3',5,5'-四甲基联苯胺,覆上新的盖板膜后于37℃避光孵育20分钟,而后每孔加入50μL终止液,迅速使用酶标仪于450nm及540nm双波长下读取每孔OD值。用450nm处读取的OD值减去540nm处读取的OD值,并以此值为纵坐标,SFMC标准品浓度为横坐标,绘得标准曲线,样品的SFMC含量可根据其OD值由标准曲线换算出相应的浓度。利用SPSS 22.0中单因素方差分析(ANOVA one-way,LSD)的方法分析各组SFMC含量的差异,大鼠血浆中的SFMC含量如表6所示。
表6治疗大鼠血浆中的SFMC含量
a)与生理盐水比,P<0.05;n=5
表6的数据表明,在0.82μmol/kg口服剂量下化合物6连续口服给药4天,可有效地降低大鼠血浆SFMC的含量。可见,本发明有显著的技术效果。
需要声明的是,上述发明内容及具体实施方式意在证明本发明所提供技术方案的实际应用,不应解释为对本发明保护范围的限定。本领域技术人员在本发明的精神和原理内,当可作各种修改、等同替换、或改进。
Claims (5)
1.一种Gly-Pro-Arg-Pro-氧乙氨羰基华法林,结构式如下:
2.制备权利要求1所述的Gly-Pro-Arg-Pro-氧乙氨羰基华法林的方法,该方法包括:
1)合成华法林-4-O-乙酸苄酯;
2)合成华法林-4-O-乙酸;
3)乙醇胺与华法林-4-O-乙酸反应合成羟基乙酰胺基华法林;
4)羟基乙酰胺基华法林与Cbz-Pro反应合成Cbz-Pro-氧乙氨羰基华法林;
5)Cbz-Pro-氧乙氨羰基华法林转化为Pro-氧乙氨羰基华法林;
6)合成Cbz-Gly-Pro-Arg(NO2)-OBzl;
7)Cbz-Gly-Pro-Arg(NO2)-OBzl转化为Cbz-Gly-Pro-Arg(NO2);
8)Pro-氧乙氨羰基华法林与Cbz-Gly-Pro-Arg(NO2)反应合成Cbz-Gly-Pro-Arg(NO2)-Pro-氧乙氨羰基华法林;
9)Cbz-Gly-Pro-Arg(NO2)-Pro-氧乙氨羰基华法林转化为权利要求1的Gly-Pro-Arg-Pro-氧乙氨羰基华法林。
3.权利要求1的Gly-Pro-Arg-Pro-氧乙氨羰基华法林林在制备无出血副作用的抗静脉血栓药物中的应用。
4.权利要求1的Gly-Pro-Arg-Pro-氧乙氨羰基华法林在制备凝血因子II拮抗剂中的应用。
5.权利要求1的Gly-Pro-Arg-Pro-氧乙氨羰基华法林在制备可溶性纤维蛋白单体复合物拮抗剂中的应用。
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