CN116102407A - 一种制备天麻提取物2,4-双(4-羟基苄基)苯酚的方法 - Google Patents
一种制备天麻提取物2,4-双(4-羟基苄基)苯酚的方法 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 241000305491 Gastrodia elata Species 0.000 title claims abstract description 10
- MZRVEZGGRBJDDB-UHFFFAOYSA-N N-Butyllithium Chemical compound [Li]CCCC MZRVEZGGRBJDDB-UHFFFAOYSA-N 0.000 claims abstract description 12
- GZFGOTFRPZRKDS-UHFFFAOYSA-N 4-bromophenol Chemical compound OC1=CC=C(Br)C=C1 GZFGOTFRPZRKDS-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052741 iridium Inorganic materials 0.000 claims abstract description 6
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- 238000005935 nucleophilic addition reaction Methods 0.000 claims abstract description 3
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Abstract
本发明提供了一种制备天麻提取物2,4‑双(4‑羟基苄基)苯酚的方法。本方法以4‑羟基间苯二甲醛和4‑溴苯酚为原料,通过正丁基锂介导的亲核加成和铱催化剂催化的苄位羟基脱氧,简便制备出具有生物活性的天麻提取物2,4‑双(4‑羟基苄基)苯酚。本发明提供的合成方法反应选择性好,反应条件温和,操作简单,步骤简洁,合成规模大,合成效率高,非常具有工业应用前景,在生物,医药及精细化工等领域具有积极作用。
Description
技术领域
本发明属于有机合成领域,以4-羟基间苯二甲醛和4-溴苯酚为原料,通过两步反应,制备具有生物活性的天麻提取物2,4-双(4-羟基苄基)苯酚。
背景技术
2,4-双(4-羟基苄基)苯酚是中药天麻的提取物的主要成分之一(Noda,N.;Kobayashi,Y.;Miyahara,K.;Fukahori,S.;Phytochemistry 1995,39,(5),1247-1248;Wang,Y.;Zhang,M.;Zhou,X.;Xu,C.;Zhu,C.;Yuan,Y.;Chen,N.;Yang,Y.;Guo,Q.;Shi,J.Natural Products and Bioprospecting 2021,11,(1),31-50;Han,A.-R.;Shin,H.-J.;Jeon,H.-R.;Lee,J.-H.;Lee,D.-H.;Seo,E.-K.Helvetica Chimica Acta 2011,94(7),1310-1314;Li,N.;Wang,K.-J.;Chen,J.-J.;Zhou,J.J.Asian Natural ProductsResearch 2007,9(4),373-377;Li,Y.M.;Zhou,Z.L.;Hong,Y.F.Yaoxue Xuebao(1993),28,(10),766-71;Li,Y.;Zhou,Z.;Hong,Y.Planta Medica 1993,59(4),363-365.)。2014年的一项研究表明,该提取物具有杀死人肺癌NCI-H460细胞的活性(Yoon,T.;Kang,G.-Y.;Han,A.-R.;Seo,E.-K.;Lee,Y.-S.Journal of Natural Products,2014,77(5),1123-1129.)。2021年的一篇专利中,也报道了该化合物具有诱导肿瘤细胞死亡的活性(Mercurio,ArthurM.;Brown,Caitlin Westberg.PCT Int.Appl.2021,WO 2021231678.)。此外,2019年,有课题组报道,该提取物还具有激活褪黑素受体的功能。构效关系研究表明,两个对位的羟基为药效团,对保持活性具有重要作用(Chen,S.;Geng,C.;Ma,Y.;Huang,X.;Yang,X.;Su,L.;He,X.;Li,T.;Deng,Z.;Gao,Z.;Zhang,X.;Chen,J.Bioorganic&Medicinal Chemistry2019,27(15),3299-3306)。然而,与其生理活性形成鲜明对比的是,2,4-双(4-羟基苄基)苯酚的获取途径却非常有限,主要依赖从草药天麻中提取。繁杂的操作步骤、极低的天然含量以及高昂的成本,极大地限制了对该天然产物生物活性的进一步研究和药学应用。因此,开发一种简便的化学合成方法,有利于推动相关药物化学的进步,更有望将该天然产物发展成为一种潜在的抗癌药物。
多个课题组在苯酚与甲醛的缩聚反应中,观察到了极其微量的2,4-双(4-羟基苄基)苯酚(Conner,A.H.;Lorenz,.F.;Hirth,K.C.Journal of Applied Polymer Science2002,86(13),3256-3263;Smit,R.;Pizzi,A.;Schutte,C.J.H.;Paul,S.O.Journal ofMacromolecular Science,Chemistry 1989,A26(6),825-41;Pethrick,R.A.;Thomson,B.British Polymer Journal 1986,18(3),171-80.Sojka,S.A.;Wolfe,R.A.;Dietz,E.A.,Jr.;Dannels,B.F.Macromolecules 1979,12(4),767-70Zigeuner,G.;Jellinek,K.;Normann,D.;Elbel,K.Monatshefte fuer Chemie 1959,90,473-480)。显然,该方法在合成层面上不具有任何实用价值。2005年,如图1所示,Flaherty等人首次实现了2,4-双(4-羟基苄基)苯酚的化学合成(Flaherty,Alice;Trunkfield,Amy;Barton,William OrganicLetter.2005,7(22),4975-4978)。首先以4-甲氧基苄基氯化镁(式3)与B-甲氧基-9-硼双环(3,3,1)-壬烷(式4),在无水、低温条件下反应,制备4-甲氧基苄基-9-硼双环(3,3,1)-壬烷(式5);经Pd催化的与2,4-二溴苯甲醚(式6)的偶联反应制备出2,4-二(4-甲氧基苄基)苯甲醚(式7),最后通过BBr3介导的脱甲基化,制备出目标产物2,4-双(4-羟基苄基)苯酚(式1)。该路线需要三步反应,每一步都需要在无水、无氧条件下进行,条件较为苛刻,操作较为麻烦,且最终只能制备出30mg产物,不能适用于大量制备。该方法用到了保护-脱保护策略,极大降低了反应的原子经济性和步骤经济性。
针对以上问题,本发明旨在提供一种简便、高效的合成2,4-双(4-羟基苄基)苯酚的方法。本方法以4-羟基间苯二甲醛和4-溴苯酚为原料,通过正丁基锂介导的亲核加成(第一步)和铱催化剂催化的苄位羟基脱氧(第二步),简便制备出具有生物活性的天麻提取物2,4-双(4-羟基苄基)苯酚。该方法选择性好、反应条件相对温和。
发明内容
本发明的技术方案如下:
如下反应式所示,以4-羟基间苯二甲醛(式1)和4-溴苯酚为原料,在正丁基锂作用下,先生成五羟基化合物(式8);随后,以甲酸为还原剂,以水为溶剂,通过铱配合物(C1~C9)催化的选择性还原脱羟基反应,制备出目标产物2,4-双(4-羟基苄基)苯酚(式2)。
上述反应式中:
相对于4-羟基间苯二甲醛(式1),正丁基锂的用量为3~20摩尔当量,4-溴苯酚的用量为3~5摩尔当量。
第二步反应中,所使用的铱配合物催化剂为C1~C9中的一种或多种的混合物,优选催化剂为C3、C4、C7和C8。其中最优选为C7催化剂。
第二步反应中,相对于式8所示化合物,催化剂的摩尔用量范围为0.001%~100%。
第一步反应中,反应温度为–78~50℃;
第二步反应中,反应温度0~100℃,其中最适温度为80℃。
第二步反应中,溶剂通常为水,同时添加与水互溶的一种或有机溶液(甲醇、乙醇、丙醇、异丙醇、丁醇、异丁醇、乙二醇、四氢呋喃、DMF、DMSO、二氧六环、丙酮),反应也可以发生。
第二步反应中,使用甲酸做为氢源;使用甲酸盐(甲酸钠、甲酸锂、甲酸钾、甲酸镁、甲酸铵、甲酸锌)和硫酸的混合物作为氢源,反应也可发生。
第二步反应中,相对于甲酸的用量为1~24倍量,甲酸盐的用量为1~4倍量。
本发明的优点和积极效果:
本发明制备提供了一种方便制备天然产物2,4-双(4-羟基苄基)苯酚的方法。该物质是中药天麻的提取物的主要成分之一,具有诱导肺癌细胞死亡和激活褪黑素受体的生物活性。本发明将在生物,医药及精细化工等领域具有积极作用。
相对前人的方法(Flaherty,Alice;Trunkfield,Amy;Barton,William OrganicLetter.2005,7(22),4975-4978),本发明提供的合成方法反应条件温和,操作简单,步骤短,合成规模大,合成效率高,非常具有工业应用前景。
附图说明
图1为式8所示化合物的核磁共振氢谱(400MHz,CDCl3)。
图2为2,4-双(4-羟基苄基)苯酚的核磁共振氢谱(400MHz,DMSO-d6)。
图3为2,4-双(4-羟基苄基)苯酚的核磁共振碳谱(400MHz,DMSO-d6)。
具体实施方式
下面以C7催化剂为实施例,进一步说明本发明,并不因此将本发明限制在所述实施例的范围之内。
第一步:
氮气保护和–78℃下,向4-溴苯酚(9.2g,53.2mmol)的四氢呋喃(120mL)溶液中缓慢加入正丁基锂的正己烷溶液(1.6mol/L)(100mL,160mmol),约30分钟后,滴加结束。反应液缓慢升至室温,并搅拌5小时。利用注射器,将4-羟基间苯二甲醛(2g,13.3mmol)的四氢呋喃(20mL)溶液缓慢滴加至上述反应液,滴加完毕后在室温搅拌过夜。加入饱和NH4Cl溶液(60mL)淬灭反应,并通过旋转蒸发除去四氢呋喃。乙酸乙酯(20mL×3)萃取水相三次,合并,.无水Na2SO4干燥后,在旋转蒸发仪上除去乙酸乙酯,得式8所示的反应中间体(橘黄色固体,1.98g,44%)。该中间体不用进一步提纯,直接用于下一步反应中。(注意:该产物含有5个羟基,在水中溶解性极好;乙酸乙酯不能完全将其从水中萃取出来,因此产率偏低)
1H NMR(400MHz,DMSO-d6)δ9.18(d,J=1.1Hz,1H),9.15(d,J=1.0Hz,2H),7.38(dd,J=15.1,2.2Hz,1H),7.17–7.02(m,4H),6.93(ddd,J=14.7,8.3,2.3Hz,1H),6.73–6.56(m,5H),5.83(d,J=4.2Hz,1H),5.50(dd,J=4.2,2.1Hz,1H),5.47–5.35(m,2H).
第二步:
向250-mL圆底烧瓶中逐次加入第一步中的粗产品(1.70g,5mmol),C7催化剂(3mg,0.005mmol)和去离子水(50mL)。将烧瓶浸入80℃的油浴锅中预热5分钟,随后用注射器缓慢加入甲酸(4.6mL,0.12mol),1分钟内加完。1小时候,反应结束。冷却至室温,加入饱和碳酸氢钠溶液(50mL)中和反应体系,再用乙酸乙酯萃取(20mL×3);萃取液用无水Na2SO4干燥后,在旋转蒸发仪上除掉乙酸乙酯。柱色谱分离(PE:EA=5:1),得到浅黄色油状产物(1.03g,67%)。室温放置3天后,固化为白色固体。
1H NMR(400MHz,Acetone-d6)δ8.09(s,1H),8.06(s,1H),8.06(s,1H),7.09(d,J=8.4Hz,2H),7.01(d,J=8.4Hz,2H),6.96(d,J=2.4Hz,1H),6.85(dd,J=8.0,2.4Hz,1H),6.78(s,1H),6.76–6.72(m,4H),3.86(s,2H),3.74(s,2H).13C NMR(101MHz,Acetone-d6)δ155.5,155.4,153.0,132.9,132.9,132.2,130.8,129.7,129.6,128.1,127.2,115.1,115.0,114.9,40.0,34.7.
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