CN116283748A - 2,5-二氯-3-甲氧基吡啶的合成方法 - Google Patents

2,5-二氯-3-甲氧基吡啶的合成方法 Download PDF

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CN116283748A
CN116283748A CN202310141934.6A CN202310141934A CN116283748A CN 116283748 A CN116283748 A CN 116283748A CN 202310141934 A CN202310141934 A CN 202310141934A CN 116283748 A CN116283748 A CN 116283748A
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methoxypyridine
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徐红岩
王鹏涛
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Kanghua Shanghai New Drug R & D Co ltd
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    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D213/00Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
    • C07D213/02Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
    • C07D213/04Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
    • C07D213/60Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
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Abstract

本发明涉及一种2,5‑二氯‑3‑甲氧基吡啶的合成方法。主要解决此化合物缺少合成方法的技术问题。本发明合成步骤:5‑氯‑3‑羟基吡啶,碳酸钾和碘甲烷在N,N‑二甲基甲酰胺中,加热得到化合物1,产品柱层析提纯;化合物1在二氯甲烷中,与间氯过氧苯甲酸反应得到化合物2,产品无需纯化;化合物2在三氯氧磷中回流,粗品柱层析纯化得到目标产物。

Description

2,5-二氯-3-甲氧基吡啶的合成方法
技术领域
本发明涉及吡啶类化合物合成方法,特别涉及到2,5-二氯-3-甲氧基吡啶(CAS:1214366-19-4)的合成方法。
背景技术
2,5-二氯-3-甲氧基吡啶作为精细化工原料和医药中间体得到广泛应用。但迄今为止关于其合成方法未见公开报道。该化合物价格昂贵,目前1克售价高达300-500美元。因此开发出此化合物的合成方法,具有很高的经济价值。该化合物的前体3-羟基-2,5-二氯吡啶有文献报道(Synthesis, 1990, # 6, p. 499 – 501)是以3-羟基吡啶为原料,在氢氧化钠水溶液中用次氯酸钠溶液氯化,得到是四个混合物,包括原料,异构体和三氯代物。虽然所要产物占主要部份,但这些杂质不能通过结晶除去,而且该反应对次氯酸钠溶液的质量要求高,一般要新做的次氯酸钠溶液才能保证重现性,因此该方法并不利于实验室及工厂生产要求。
发明内容
本发明的目的是提供一种2,5-二氯-3-甲氧基吡啶的合成方法, 主要解决此化合物缺少合成方法的技术问题。
本发明技术方案如下:一种2,5-二氯-3-甲氧基吡啶的合成方法,包括以下步骤:
(1)5-氯-3-羟基吡啶,碳酸钾和碘甲烷在N,N-二甲基甲酰胺中,加热得到化合物1,产品柱层析提纯;
(2)化合物1在二氯甲烷中,与间氯过氧苯甲酸反应得到化合物2,产品无需纯化;
(3)化合物2在三氯氧磷中回流,粗品柱层析纯化得到目标产物。
本发明的反应路线如下:
Figure SMS_1
上述反应中,步骤1所述加热温度为50℃-70℃,优选60℃,反应4-8小时,优选反应时间6小时。步骤2反应温度为10℃-40℃,优选反应温度为25℃,反应6-18小时,优选反应时间为12小时。步骤3反应2-4小时, 优选反应时间为3 小时。
本发明的有益效果是:提供了一种2,5-二氯-3-甲氧基吡啶的合成方法,此方法起始原料便宜,路线短,尤其是第三步氯代的选择性好,适合实验室和工厂放大生产。
附图说明
图1为本发明产物的质谱图。
图2为本发明产物的核磁图谱。
具体实施方式
实施例1:2,5-二氯-3-甲氧基吡啶。
步骤1:
将5-氯-3-羟基吡啶(50 g,0.386 mol)和碳酸钾(133 g,0.965 mol)加入N,N-二甲基甲酰胺(1 L)中,向其中加入碘甲烷(82 g, 0.579 mol),加完升温至60摄氏度,搅拌6小时。冷却至室温,将反应液倒入水(3 L)和乙酸乙酯(1.5L)中,搅拌,分液。有机相无水硫酸钠干燥,过滤,减压浓缩干。所得粗品柱层析纯化(石油醚:乙酸乙酯体积比= 5:1)得无色液体化合物1(33.8 g,61%收率)。
步骤2:
化合物1(33.8 g,0.235 mol)溶于二氯甲烷(500 mL)中,冰水浴下加入85%间氯过氧苯甲酸(71.7 g ,0.353 mol)。加完反应液升温至25℃,搅拌12小时。反应液倒入1M氢氧化钠水溶液(500 mL)中,搅拌,分液。有机相无水硫酸钠干燥,过滤,减压浓缩干。所得粗品化合物2直接用于下一步。
步骤3:
化合物2粗品(0.235 mol)加入三氯氧磷(300 mL)中,加热回流3小时。冷却,反应液减压浓缩干。粗品倒入冰水中,用碳酸氢钠中和,乙酸乙酯萃取。有机相无水硫酸钠干燥,过滤,减压浓缩干。所得粗品柱层析纯化(石油醚:乙酸乙酯体积比= 10:1)得白色固体产品(22 g,52%收率)。
MS (ESI) M/Z: 177.7 [M+H]+1H NMR (400 MHz, CDCl3) 7.97(s,1H),7.20(s,1H),3.93(s,3H)。质谱图和核磁图谱参照图1、2。
实施例2,步骤1反应温度为50℃,反应时间8小时;步骤2反应温度为10℃,反应时间18小时;步骤3反应时间2小时。其余同实施例1。
实施例3,步骤1反应温度为70℃,反应时间4小时;步骤2反应温度为40℃,反应时间6小时;步骤3反应时间4小时。其余同实施例1。

Claims (7)

1.一种2,5-二氯-3-甲氧基吡啶的合成方法,其特征是:包括以下步骤:
(1)5-氯-3-羟基吡啶,碳酸钾和碘甲烷在N,N-二甲基甲酰胺中,加热得到化合物1,产品柱层析提纯;
(2)化合物1在二氯甲烷中,与间氯过氧苯甲酸反应得到化合物2,产品无需纯化;
(3)化合物2在三氯氧磷中回流,粗品柱层析纯化得到目标产物;合成线路如下:
Figure QLYQS_1
2.根据权利要求1所述的2,5-二氯-3-甲氧基吡啶的合成方法,其特征是:步骤1所述加热温度为50℃-70℃,反应4-8小时。
3.根据权利要求2所述的2,5-二氯-3-甲氧基吡啶的合成方法,其特征是:所述加热温度为60℃,反应6小时。
4.根据权利要求1所述的2,5-二氯-3-甲氧基吡啶的合成方法,其特征是:所述步骤2,反应温度为10℃-40℃,反应6-18小时。
5.根据权利要求4所述的2,5-二氯-3-甲氧基吡啶,其特征是:反应温度为25℃,反应12小时。
6.根据权利要求1所述的2,5-二氯-3-甲氧基吡啶的合成方法,其特征是:所述步骤3,回流反应2-4小时。
7.根据权利要求6所述的2,5-二氯-3-甲氧基吡啶的合成方法,其特征是:回流反应3小时。
CN202310141934.6A 2023-02-21 2023-02-21 2,5-二氯-3-甲氧基吡啶的合成方法 Pending CN116283748A (zh)

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