CN110453242B - 一种电化学合成吴茱萸次碱的方法 - Google Patents
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- BCPAKGGXGLGKIO-UHFFFAOYSA-N Pseudorutaecarpin Natural products C1=CC=C2C(=O)N(CCC3=C4C5=CC=CC=C5N3)C4=NC2=C1 BCPAKGGXGLGKIO-UHFFFAOYSA-N 0.000 title claims abstract description 31
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Abstract
本发明公开了一种电化学合成吴茱萸次碱的方法,包括如下步骤:取10 mL三颈瓶,加入0.3 mmol(2‑氨基苯基)(1,3,4,9‑四氢‑2H‑吡啶并[3,4‑b]吲哚‑2‑基)甲酮和20 mol%电解质四丁基六氟磷酸铵,再加入5 mL乙腈溶解,用网状玻璃体碳(RVC)作阳极,铂片作阴极,通入10 mA恒电流,在空气氛围中,70℃下进行搅拌反应,薄层色谱监测反应进程;待反应完成后,用旋转蒸发仪除去溶剂,残留物经快速硅胶柱层析纯化,得到所需产物。本发明方法通过电化学交叉脱氢偶联反应,合成吴茱萸次碱的新方法,可以避免传统合成方法中所运用到的大量氧化剂、添加剂、金属催化剂等试剂,仅在温和环保的电化学条件下,就能简单快速地获得吴茱萸次碱天然产物。
Description
技术领域
本发明涉及化合物的合成方法,具体是一种电化学合成吴茱萸次碱的方法。
背景技术
吴茱萸次碱(Rutaecarpine, Rut)是从中药吴茱萸中提取出来的化学单体。吴茱萸是一种用于治疗高血压、心绞痛等的传统中药,应用十分广泛,吴茱萸次碱是其主要有效成分。作为吴茱萸中最具代表性的吲哚并吡啶喹唑啉生物碱之一,吴茱萸次碱具有广泛的药理作用,如:抗高血压、抗癌、抗炎、抗血栓形成、抗肥胖等。由于中药有效成分往往具有多靶点的特征,而多靶点药物可作用于发病机制中的多个靶点,这种协同效应能减少药物对人体的副作用,治疗效果更佳,这预示着吴茱萸次碱有开发成新药物的潜力,目前许多学者正致力于将其开发成 一种全新作用机制的抗高血压、抗炎药物,所以合成此类化合物十分具有意义研究。(Molecules,2010, 15, 1873; J. Am. Pharm. Assoc.1933, 22, 716;Bioorg. Med. Chem. 2009, 17, 2351.) 基于吴茱萸次碱具有特殊的生物性质,其分离、合成、生物活性、代谢及其毒理学研究受到了大量学者的青睐,但由于提取出的单体化合物的种类和数量较少,导致难以进行深入的后续研究。
目前合成吴茱萸次碱(Rut)的方法有以下:
一:该方法原料易得,反应条件温和,时间短,通过改变内酰胺的种类可得到一系列衍生物,粗品经乙醇重结晶可得纯品;
合成路线图为:
二:以靛红酸酐为原料,经7步反应,得到Rut,反应时间长,步骤较多,该文献报道中指出目标产物仅为Rut,没有其他衍生物,但产率仍只有30%;
三:以靛红酸酐为原料,经4步反应,得到Rut,条件温和,时间较短,合成文献中目标产物的底物可在苯环上增加取代基以得到衍生物,但产率较低;
四:以邻氨基苯甲酰胺和戊己二酸酐为原料,经6步反应获得Rut,产率为34.6%。虽然条件温和,但是反应时间较长。
CN106892918B公开一种从吴茱萸中制备吴茱萸次碱的新方法,取干燥的原料粉末,加入溶剂(如甲醇、乙醇、异丙醇、丙酮、氯仿、二氯甲烷、乙酸乙酯,或它们的混合溶剂,或甲醇、乙醇、丙酮的水溶液)提取,回收溶剂,得浸膏;用弱极性溶剂(石油醚、戊烷、己烷、环己烷、正己烷、正庚烷,或其混合溶剂)对浸膏进行提取,提取液经回收溶剂浓缩至一定体积,过滤;取滤饼,用二氯甲烷、氯仿、丙酮、乙醇、乙酸乙酯、异丙醇或它们的混合溶剂进行结晶,得到吴茱萸次碱粗产品;吴茱萸次碱粗产品进行重结晶得到吴茱萸次碱晶体。
综上,目前合成吴茱萸次碱的方法为多步合成法,步骤较多,产率较低,难以进行克级生产,以至于影响进一步的药理学评价;反应一般需要的起始材料、试剂较为复杂,合成被取代基限制;反应需要用到大量强酸、强碱、氧化剂等试剂。现有合成吴茱萸次碱类化合物的方法存在许多问题,所以发展一种绿色环保、简便快捷的吴茱萸次碱天然产物合成方法是一项非常有意义的工作。
发明内容
本发明的目的是提供一种电化学交叉脱氢偶联反应,合成吴茱萸次碱的新方法,可以避免传统合成方法中所运用到的大量氧化剂、添加剂、金属催化剂等试剂,仅在温和环保的电化学条件下,就能简单快速地获得天然产物吴茱萸次碱。
实现本发明目的的技术方案是:
一种电化学合成吴茱萸次碱的方法,合成路线如下:
所述电化学合成吴茱萸次碱的方法,包括如下步骤:
(1)取10 mL三颈瓶,加入0.3 mmol (2-氨基苯基)(1,3,4,9-四氢-2H-吡啶并[3,4-b]吲哚-2-基)甲酮和20 mol%电解质四丁基六氟磷酸铵,再加入8 mL乙腈溶解,用网状玻璃体碳(RVC)作阳极,铂片作阴极,通入10 mA恒电流,在空气氛围中,70℃下进行搅拌反应,薄层色谱监测反应进程;
(2)待反应完成后,用旋转蒸发仪除去溶剂,残留物经快速硅胶柱层析纯化,得到所需产物。
步骤(2)所述快速硅胶柱层析纯化,洗脱剂体积比为石油醚:乙酸乙酯 = 5: 1。
有机电化学是有机合成中的重要部分,它能以温和的反应条件实现反应,不仅节约能源,还避免了氧化剂和还原剂的使用,本发明在无金属、无氧化剂、温和环保的电化学条件下,采用简便易操作的方法实现了C-H/N-H交叉脱氢偶联构建C=N键,实现了吴茱萸次碱天然产物的合成。该方法绿色、环保、高效,有良好的应用前景。
在电化学条件下构建C=N键以合成吴茱萸次碱的底物选择中,(2-氨基苯基)(1,3,4,9-四氢-2H-吡啶并[3,4-b]吲哚-2-基)甲酮无疑是最佳的选择,以色胺等化合物为原料,仅通过简单快捷的合成即可获得。从原料合成角度看,本发明方法仅用到廉价易得的原材料,通过简单的方法快速获得最佳底物;从合成目标产物角度看,本发明方法在环保且温和的电化学条件下,以高效率、低污染等优势实现了吴茱萸次碱的合成,为电化学条件下合成天然产物提供有力的证明。
具体实施方式
下面结合实施例对本发明内容作进一步的说明,但不是对本发明的限定。
实施例
电化学合成吴茱萸次碱的方法,包括如下步骤:
(1)以色胺为原料,参考已公开的文献合成(2-氨基苯基)(1,3,4,9-四氢-2H-吡啶并[3,4-b]吲哚-2-基)甲酮(Angew. Chem. Int. Ed., 2017, 56, 14968; Org. Lett.,2016, 18, 345),合成路线如下:
(2)取10 mL三颈瓶,加入0.3 mmol (2-氨基苯基)(1,3,4,9-四氢-2H-吡啶并[3,4-b]吲哚-2-基)甲酮和20 mol%电解质四丁基六氟磷酸铵,再加入8 mL乙腈溶解,用网状玻璃体碳(RVC)作阳极,铂片作阴极,通入10 mA恒电流,在空气氛围中,70℃下进行搅拌反应,薄层色谱监测反应进程;
合成路线如下:
(3)待反应完成后,用旋转蒸发仪除去溶剂,残留物经快速硅胶柱层析纯化(洗脱剂体积比为石油醚:乙酸乙酯 = 1:5),得到白色固体产物,产率80%,产率较高。
产物表征:White solid (80%, 68.91 mg), mp: 270.9 – 273.2 oC; 1H NMR(400 MHz, CDCl3) δ 9.52 (s, 1H), 8.33 (dd, J = 8.0, 1.1 Hz, 1H), 7.73 – 7.60(m, 3H), 7.45 – 7.28 (m, 3H), 7.20 – 7.15 (m, 1H), 4.59 (t, J = 6.9 Hz, 2H),3.24 (t, J = 6.9 Hz, 2H). 13C NMR (100 MHz, CDCl3) δ 161.6, 147.5, 145.0,138.3 134.4, 127.3, 127.2, 126.6, 126.2, 125.7, 125.6, 121.2, 120.6, 120.1,118.4, 112.1, 41.2, 19.7. HRMS (m/z) (ESI) calculated for C18H14N3O+ 288.1131[M+H+]; found: 288.1115。
Claims (3)
2.根据权利要求1所述的电化学合成吴茱萸次碱的方法,其特征在于,包括如下步骤:
(1)取10 mL三颈瓶,加入0.3 mmol (2-氨基苯基)(1,3,4,9-四氢-2H-吡啶并[3,4-b]吲哚-2-基)甲酮和20 mol%电解质四丁基六氟磷酸铵,再加入8 mL乙腈溶解,用网状玻璃体碳作阳极,铂片作阴极,通入10 mA恒电流,在空气氛围中,70℃下进行搅拌反应,薄层色谱监测反应进程;
(2)待反应完成后,用旋转蒸发仪除去溶剂,残留物经快速硅胶柱层析纯化,得到所需产物。
3.根据权利要求2所述的电化学合成吴茱萸次碱的方法,其特征在于,步骤(2)所述快速硅胶柱层析纯化,洗脱剂体积比为石油醚:乙酸乙酯 = 5:1。
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