CN112374974A - 一种异木兰花碱的合成方法 - Google Patents
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Abstract
本发明公开了一种异木兰花碱的合成方法,包括以下步骤:(1)将邻苯二酚(化合物1)和对氟苯丙酮(化合物2)溶于有机溶剂,在碱性条件下反应,生成1‑[4‑(2‑羟基苯氧基)苯基]‑1‑丙酮(化合物3);(2)在化合物3的溶液中加入碱性试剂,然后滴加3‑溴丙烯(化合物4),反应生成1‑(4‑(2‑(烯丙氧基)苯氧基)苯基)‑1‑丙酮(化合物5);(3)将化合物5溶解,加热反应,生成目标化合物异木兰花碱(化合物6);本发明所述的异木兰花碱的合成方法操作简单,原料廉价,产率较高,易于工业化生产。
Description
技术领域
本发明属于化合物合成技术领域,具体涉及一种异木兰花碱的合成方法。
背景技术
异木兰花碱属于天然的木脂素类化合物,由两分子的苯丙素衍生物(即C6-C3单体)聚合而成,它也是一种植物雌激素,可以清除体内自由基,起到抗氧化的作用,同时具有抗真菌、免疫抑制活性。该化合物的化学结构式如下所示:
最初该化合物是由Kouno I等人从八角茴香树皮中分离得到的,但是分离步骤复杂,且产率低。
随后,Panda A K等人报道了一种的合成方法(Indian Journal of Chemistry,2002,41B:181-183),其合成路线如下:
(1)在多聚磷酸存在下,通过苯甲醚和丙酸的缩合得到对甲氧基苯丙酮(化合物7):
(2)用10g的Py-HBr、1g的化合物7为原料,用溴吡啶去甲基化得到4-羟基苯丙酮(8),产率为60%。
(3)用不同的溶剂和碱,对化合物8与2-氯硝基苯的缩合反应进行了多种尝试。如在室温搅拌条件下,尝试了各种溶剂-碱组合,反应均不成功。在NaH/DMF组合的加热条件下,反应虽在12h内完成,但产物2-硝苯基-4’-丙酰基苯基醚(9)量极少,因此没有进一步研究。在MeOH/KOH条件下,也得到了相同的结果。吡啶既做溶剂有做碱时,几乎不反应,但当反应混合物与Et3N或K2CO3或KOH在吡啶中回流时,反应进行得慢,底物消失的也慢。当用DMF和KOH进行反应时,在1h内,经薄层色谱检测,仍然存在起始原料,但产物2-硝基苯基-4’-丙酰基苯基醚(9)有大量生成,反应时间对化合物9的产率有较大影响。因此,反应时间应该限制在2h内,并以75%的收率获得所需的化合物9。化合物9按下图所示的反应顺序转化为2-烯丙基苯基-4’-丙酰基苯基醚(12)。然后在N,N-二甲基苯胺下,对化合物12进行克莱森重排,得到目标化合物异木兰花碱(6)。虽然得到目标化合物,但是该合成方法的步骤繁琐,且消耗大量的原料和试剂并且产率低下,不适合工业化生产。
发明内容
发明目的:针对上述技术问题,本发明提供了一种异木兰花碱的全新合成方法,该方法简便易行、收率高,质量好,便于工业化生产。
技术方案:为了达到上述发明目的,本发明所采用的技术方案如下:
一种异木兰花碱的合成方法,包括以下步骤:
(1)将邻苯二酚(化合物1)和对氟苯丙酮(化合物2)溶于有机溶剂,在碱性条件下反应,生成1-[4-(2-羟基苯氧基)苯基]-1-丙酮(化合物3);
(2)在化合物3的溶液中加入碱性试剂,然后滴加3-溴丙烯(化合物4),反应生成1-(4-(2-(烯丙氧基)苯氧基)苯基)-1-丙酮(化合物5);
(3)将化合物5溶解,加热反应,生成目标化合物异木兰花碱(化合物6);
作为优选:
步骤(1)中,所述有机溶剂选自二甲基亚砜,所述碱性条件是加入叔丁醇钾,反应的温度为130-150℃,TLC检测反应是否结束。
步骤(1)中,所述化合物1和化合物2的摩尔比为(1-4):(1)。
步骤(2)中,所述化合物3的溶液,其中的溶剂选自丙酮;所述碱性试剂选择无水碳酸钾,反应的温度为40-60℃,TLC检测反应是否结束。
步骤(2)中,所述化合物3和化合物4的摩尔比为(1):(1-2)。
步骤(3)中,所述将化合物5溶解采用N,N-二甲基苯胺溶解,加热反应的温度为180-200℃,TLC检测反应是否结束。
本发明异木兰花碱的合成方法,是以邻苯二酚为起始原料,先与对氟苯丙酮发生亲核取代反应生成1-[4-(2-羟基苯氧基)苯基]-1-丙酮,然后再与3-溴丙烯在碱性条件下发生亲核取代反应生成化合物1-(4-(2-(烯丙氧基)苯氧基)苯基)-1-丙酮,化合物1-(4-(2-(烯丙氧基)苯氧基)苯基)-1-丙酮在高温条件下发生克莱森重排得到目标化合物异木兰花碱。优选的,包括以下步骤:
(1)将邻苯二酚(化合物1)和对氟苯丙酮(化合物2)溶于二甲基亚砜中,加入叔丁醇钾,于140℃下反应,反应结束后,乙酸乙酯萃取,无水硫酸钠干燥浓缩、柱层析分离得到1-[4-(2-羟基苯氧基)苯基]-1-丙酮(3)。
(2)将化合物3溶于丙酮中,加入无水碳酸钾,缓慢滴加3-溴丙烯(4)到反应液中,50℃下反应。反应结束后,乙酸乙酯萃取,无水硫酸钠干燥浓缩,柱层析分离得到1-(4-(2-(烯丙氧基)苯氧基)苯基)-1-丙酮(5)。
(3)用适量的N,N-二甲基苯胺溶解化合物5,190℃下反应。反应结束后,盐酸调PH至5,乙酸乙酯萃取,无水硫酸钠干燥浓缩,柱层析分离得到目标化合物异木兰花碱(6)。
技术效果:与现有技术相比,本发明的优点在于:1、较于KounoI等人的提取分离方法,本方案操作简单,成本低廉,并且产率高,适于大量生产;2、较于之前Panda AK等人报道的合成方法,本发明使全合成步骤简化,做到节约时间,财力,物力,并且使产率大大提高。化合物3作为异木兰花碱全合成中的一个必需中间体,之前的方案需要三步才能得到,而本发明只需一步便可获得。而且本发明的方案使用的试剂,溶剂更加绿色环保。
附图说明
图1为本发明实施例所得异木兰花碱的1H-NMR图谱。
图2为本发明实施例所得异木兰花碱的13C-NMR图谱。
图3为本发明实施例所得异木兰花碱的单晶图。
具体实施方式
以下通过实例对本发明做进一步详细阐述。
实施例:
本实施例中异木兰花碱(Isomagnolone)的合成方法包括以下步骤:
(1)分别称取邻苯二酚(54.5mmol,6000mg),对氟苯丙酮(13.6mmol,2074mg),叔丁醇钾(54.5mmol,6118mg)于100mL圆底烧瓶中,向其加入30mL二甲基亚砜溶液搅拌使之溶解,140℃反应,TLC检测直至反应结束。反应结束后,乙酸乙酯(3×100mL)萃取,无水硫酸钠干燥浓缩,柱层析(石油醚:二氯甲烷:乙酸乙酯=15:1:1)分离得到1-[4-(2-羟基苯氧基)苯基]-1-丙酮(3)(白色固体),产率为40%。
(2)将化合物3用适量的丙酮溶解,加入无水碳酸钾(10.9mmol,1505mg),缓慢地滴加0.6mL的3-溴丙烯(6.5mmol),50℃下反应,TLC检测至反应结束。反应结束后,乙酸乙酯萃取,无水硫酸钠干燥浓缩,柱层析(石油醚:乙酸乙酯=10:1)分离得到白色固体的1-(4-(2-(烯丙氧基)苯氧基)苯基)-1-丙酮(5),产率为97%。
(3)用适量的N,N-二甲基苯胺溶解化合物5,190℃反应,TLC检测至反应结束,用2mol/L的稀盐酸溶液调节PH至5,乙酸乙酯萃取,无水硫酸钠干燥浓缩,柱层析(石油醚:乙酸乙酯=10:1)分离得到异木兰花碱(1570mg,66.2%)。
异木兰花碱(Isomagnolone)的谱图数据:白色固体,1H NMR(400MHz,CDCl3)δ:7.94-7.96(m,2H,-Ph),6.98-7.04(m,3H,-Ph),6.83-6.84(d,J=4.8Hz,2H,-Ph),6.00-6.07(m,1H,-CH=CH2),5.09-5.14(m,2H,-CH2=CH),3.46-3.47(d,J=6.4Hz,2H,-CH2-CH3),2.93-2.99(m,2H,-CH2-CH=CH2),1.20-1.23(t,J=7.2Hz,3H,-CH2-CH3)(图1);13CNMR(100MHz CDCl3)δ:199.34,160.99,145.70,142.00,136.18,132.21,130.32,128.15,126.37,120.24,117.93,116.91,116.00,34.08,31.61,8.32(图2)。其单晶图,如图3所示。
Claims (6)
2.根据权利要求1所述的异木兰花碱的合成方法,其特征在于,步骤(1)中,所述有机溶剂选自二甲基亚砜,所述碱性条件是加入叔丁醇钾,反应的温度为130-150℃,TLC检测反应是否结束。
3.根据权利要求1所述的异木兰花碱的合成方法,其特征在于,步骤(1)中,所述化合物1和化合物2的摩尔比为(1-4):(1)。
4.根据权利要求1所述的异木兰花碱的合成方法,其特征在于,步骤(2)中,所述化合物3的溶液,其中的溶剂选自丙酮;所述碱性试剂选择无水碳酸钾,反应的温度为40-60℃,TLC检测反应是否结束。
5.根据权利要求1所述的异木兰花碱的合成方法,其特征在于,步骤(2)中,所述化合物3和化合物4的摩尔比为(1):(1-2)。
6.根据权利要求1所述的异木兰花碱的合成方法,其特征在于,步骤(3)中,所述将化合物5溶解采用N,N-二甲基苯胺溶解,加热反应的温度为180-200℃,TLC检测反应是否结束。
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