CN109280027A - 一种5,6-二甲氧基-2-吡啶甲酸的合成方法 - Google Patents

一种5,6-二甲氧基-2-吡啶甲酸的合成方法 Download PDF

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CN109280027A
CN109280027A CN201811522384.8A CN201811522384A CN109280027A CN 109280027 A CN109280027 A CN 109280027A CN 201811522384 A CN201811522384 A CN 201811522384A CN 109280027 A CN109280027 A CN 109280027A
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compound
synthetic method
dimethoxy
carboxylic acid
pyridine carboxylic
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徐红岩
杨林
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Kang (shanghai) New Medicine Research & Development Co Ltd
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Kang (shanghai) New Medicine Research & Development Co Ltd
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    • CCHEMISTRY; METALLURGY
    • 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
    • C07D213/78Carbon atoms having three bonds to hetero atoms, with at the most one bond to halogen, e.g. ester or nitrile radicals
    • C07D213/79Acids; Esters
    • CCHEMISTRY; METALLURGY
    • 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
    • C07D213/78Carbon atoms having three bonds to hetero atoms, with at the most one bond to halogen, e.g. ester or nitrile radicals
    • C07D213/79Acids; Esters
    • C07D213/803Processes of preparation

Abstract

本发明公开一种5,6‑二甲氧基‑2‑吡啶甲酸的合成方法。主要解决现有合成方法存在反应需高温进行,实验操作困难,对设备要求高,不利于工业化生产放大的技术问题。本发明合成方法包括以下步骤:第一步,室温下,2‑溴‑3‑羟基吡啶在碳酸钾的水溶液中和单质碘反应,得到化合物1,产物无需提纯,直接用于下一步反应;第二步,化合物1在N,N‑二甲基甲酰胺中和碳酸钾反应后加入碘甲烷,搅拌过夜,得到化合物2;第三步,化合物2和甲醇钠在N,N‑二甲基甲酰胺中反应,溴被甲氧基选择性取代,得到化合物3;第四步,在低温下化合物3和正丁基锂在四氢呋喃中反应,然后加入固体二氧化碳,室温反应,经盐酸酸化,得到目标化合物4,在石油醚和乙酸乙酯混合溶剂中重结晶纯化得到纯品产物。

Description

一种5,6-二甲氧基-2-吡啶甲酸的合成方法
技术领域
本发明涉及到5,6-二甲氧基-2-吡啶甲酸(CAS:324028-89-9)的合成。
背景技术
5,6-二甲氧基-2-吡啶甲酸作为精细化工原料,医药中间体得到广泛应用。但是迄今为止关于其合成方法少有公开报道。
有文献报道合成线路如下:
该合成路线反应第一步都需要在高温进行,实验操作困难,对设备要求高,不利于工业化生产放大。
发明内容
本发明的目的是提供一种5,6-二甲氧基-2-吡啶甲酸的合成方法, 主要解决现有合成方法存在反应需高温进行,实验操作困难,对设备要求高,不利于工业化生产放大的技术问题。
本发明的技术方案为:一种5,6-二甲氧基-2-吡啶甲酸的合成方法,其特征是包括以下步骤:第一步,室温下,2-溴-3-羟基吡啶在碳酸钾的水溶液中和单质碘反应,得到化合物1,产物无需提纯,直接用于下一步反应;第二步,化合物1在N,N-二甲基甲酰胺中和碳酸钾反应后加入碘甲烷,搅拌过夜,得到化合物2; 第三步,化合物2和甲醇钠在N,N-二甲基甲酰胺中反应,溴被甲氧基选择性取代,得到化合物3;第四步,在低温下化合物3和正丁基锂在四氢呋喃中反应,然后加入固体二氧化碳,室温反应,经盐酸酸化,得到目标化合物4,在石油醚和乙酸乙酯混合溶剂中重结晶纯化得到纯品产物,
合成线路如下:
上述反应中,步骤2反应温度为20-30℃,优选反应温度为25℃;步骤3反应温度为90-110℃,优选反应温度为100℃;步骤4所述低温为-70~-85℃,优选反应温度为-78℃;反应液用1 N盐酸酸化。
本发明的优点是:所用试剂便宜,反应条件简单,在整个合成过程中,中间体和目标产物无需经过色谱柱分离;在石油醚和乙酸乙酯混合溶剂中重结晶即可得到高纯度的目标产物。
具体实施方式
实施例1:
步骤1:
向三口烧瓶中依次加入2-氯溴-3-羟基吡啶(6.6 g, 38.15 mmol),水(90 mL)和碳酸钾(10.5 g, 76.30 mmol)。搅拌冰浴下加入单质碘(10.2 g, 40.06 mmol),反应液室温搅拌过夜。滴加乙酸调节pH=6~7,析出大量固体,过滤,固体再用水洗,干燥得到淡黄色固体,化合物1 (10.0 g, 33.33 mmol, 87 %),直接用于下一步反应。1H NMR (400 MHz, CDCl3)6.99 (d, J 8.4 Hz, 1 H), 7.53 (d, J 8.4 Hz, 1 H) ppm。
步骤2:
向三口烧瓶中加入化合物1 (10.0 g, 33.33 mmol), N,N-二甲基甲酰胺 (100 mL)和碳酸钾 (9.2 g, 66.67 mmol);反应液搅拌30分钟。反应液冷却至0℃,滴加入碘甲烷(7.5g 50.1 mmol),滴加完25 ℃搅拌反应过夜。加入水(100 mL)乙酸乙酯萃取 (80 mL x 2);有机相合并,用饱和食盐水 (100 mLx 2)洗涤,无水硫酸钠干燥,过滤。 滤液旋干得到黄色固体,石油醚和乙酸乙酯混合溶剂(PE/EA体积比=15:1)重结晶得到淡黄色固体,化合物2(8.0 g, 25.48 mmol, 76 %)。
步骤3:
向三口烧瓶中加入化合物2 (22.0 g, 70.06 mmol),N,N-二甲基甲酰胺 (200 mL)和甲醇钠 (11.4 g, 210.18 mmol);反应液在100℃搅拌1小时。反应液冷却至室温,加入饱和碳酸氢钠水溶液(400 mL),乙酸乙酯萃取 (200 mL x 2);有机相合并,用水 (200 mL x 2)和饱和食盐水 (200 mL)洗涤,硫酸钠干燥,过滤。 滤液旋干得到白色固体,化合物3 (13.2g, 49.81 mmol, 71 %)。1H NMR (400 MHz, CDCl3) 3.86 (s, 3 H), 4.00 (s, 3 H),6.74 (d, J 8.0 Hz, 1 H), 7.23 (d, J 8.0 Hz, 1 H) ppm。
步骤4:
向三口烧瓶中加入化合物3 (16.5 g, 62.26 mmol),无水四氢呋喃(160 mL)。在-78℃滴加正丁基锂的正己烷溶液(2.5 M,29.9 mL, 74.41 mmol ),并在此温度下搅拌30分钟,加入干冰(20 g),反应液在-78℃反应20 分钟后,自然升至室温搅拌30分钟。加水(150mL),异丙醚萃取(100 mL x 3);水相用1 N盐酸酸化至pH=3~4,乙酸乙酯萃取 (100 mL x3);有机相合并,用饱和食盐水 (100 mL)洗涤,无水硫酸钠干燥,过滤。 滤液旋干得到粗品,在石油醚和乙酸乙酯混合溶剂(PE/EA体积比=3:1)重结晶,得到米黄色固体,目标化合物4 (6.0 g, 32.79 mmol, 52 %)。UPLC-MS m/z calcd for C8H9NO4 [M + H]+ 184.14; 1HNMR (400 MHz, d-DMSO) 3.85 (s, 3 H), 3.91 (s, 3 H), 7.37 (d, J 8.0 Hz, 1 H),7.70 (d, J 8.0 Hz, 1 H) ppm。
实施例2,步骤2反应温度为20℃;步骤3反应温度为90℃;步骤4反应温度为-70℃,其余同实施例1。
实施例3,步骤2反应温度为30℃;步骤3反应温度为110℃;步骤4反应温度为-85℃;其余同实施例1。

Claims (5)

1.一种5,6-二甲氧基-2-吡啶甲酸的合成方法, 其特征是:包括以下步骤:第一步,室温下,2-溴-3-羟基吡啶在碳酸钾的水溶液中和单质碘反应,得到化合物1,产物无需提纯,直接用于下一步反应;第二步,化合物1在N,N-二甲基甲酰胺中和碳酸钾反应后加入碘甲烷,搅拌过夜,得到化合物2; 第三步,化合物2和甲醇钠在N,N-二甲基甲酰胺中反应,溴被甲氧基选择性取代,得到化合物3;第四步,在低温下化合物3和正丁基锂在四氢呋喃中反应,然后加入固体二氧化碳,室温反应,经盐酸酸化,得到目标化合物4,在石油醚和乙酸乙酯混合溶剂中重结晶纯化得到纯品产物,合成线路如下:
2.根据权利要求1所述的一种5,6-二甲氧基-2-吡啶甲酸的合成方法,其特征是:第二步反应温度为20-30℃。
3.根据权利要求1所述的一种5,6-二甲氧基-2-吡啶甲酸的合成方法,其特征是:第三步反应温度为90-110℃。
4.根据权利要求1所述的一种5,6-二甲氧基-2-吡啶甲酸的合成方法,其特征是:第四步所述低温为-70~-85℃。
5.根据权利要求1所述的一种5,6-二甲氧基-2-吡啶甲酸的合成方法,其特征是:第四步反应液用1 N盐酸酸化。
CN201811522384.8A 2018-12-13 2018-12-13 一种5,6-二甲氧基-2-吡啶甲酸的合成方法 Pending CN109280027A (zh)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109988116A (zh) * 2019-04-29 2019-07-09 上海吉奉生物科技有限公司 一种2-羟甲基-5-三氟甲基嘧啶的合成方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009001127A1 (en) * 2007-06-26 2008-12-31 Astrazeneca Ab Cyanocyclopropylcarboxamides as cathepsin inhibitors
WO2010141275A1 (en) * 2009-06-01 2010-12-09 Merck Sharp & Dohme Corp. Pyrazine carboxamide orexin receptor antagonists
CN102272103A (zh) * 2008-10-30 2011-12-07 默沙东公司 异烟酰胺食欲素受体拮抗剂
CN107922427A (zh) * 2015-02-25 2018-04-17 艾丽奥斯生物制药有限公司 抗病毒化合物
WO2018157779A1 (zh) * 2017-02-28 2018-09-07 康朴生物医药技术(上海)有限公司 一种新的异二氢吲哚衍生物、其药物组合物及应用

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009001127A1 (en) * 2007-06-26 2008-12-31 Astrazeneca Ab Cyanocyclopropylcarboxamides as cathepsin inhibitors
CN102272103A (zh) * 2008-10-30 2011-12-07 默沙东公司 异烟酰胺食欲素受体拮抗剂
WO2010141275A1 (en) * 2009-06-01 2010-12-09 Merck Sharp & Dohme Corp. Pyrazine carboxamide orexin receptor antagonists
CN107922427A (zh) * 2015-02-25 2018-04-17 艾丽奥斯生物制药有限公司 抗病毒化合物
WO2018157779A1 (zh) * 2017-02-28 2018-09-07 康朴生物医药技术(上海)有限公司 一种新的异二氢吲哚衍生物、其药物组合物及应用

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CARLA BOBBIO ET AL.: "Creating Structural Manifolds from a Common Precursor: Basicity Gradient-Driven Isomerization of Halopyridines", 《EUR. J. ORG. CHEM.》 *
ERIC P. ARNOLD ET AL.: "Total Synthesis of (±)-Cytisine", 《ORGANIC LETTERS》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109988116A (zh) * 2019-04-29 2019-07-09 上海吉奉生物科技有限公司 一种2-羟甲基-5-三氟甲基嘧啶的合成方法

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Application publication date: 20190129