CN106631999A - 一种低成本1‑(4‑吡啶基)‑2‑丙酮的制备方法 - Google Patents

一种低成本1‑(4‑吡啶基)‑2‑丙酮的制备方法 Download PDF

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CN106631999A
CN106631999A CN201611075106.3A CN201611075106A CN106631999A CN 106631999 A CN106631999 A CN 106631999A CN 201611075106 A CN201611075106 A CN 201611075106A CN 106631999 A CN106631999 A CN 106631999A
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dichloromethane
acetone
temperature control
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CN106631999B (zh
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马维恒
包建辉
谢何青
俞彬
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HUZHOU HENGYUAN BIOCHEM TECHNOLOGY 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
    • C07D213/24Heterocyclic 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 substituted hydrocarbon radicals attached to ring carbon atoms
    • C07D213/44Radicals substituted by doubly-bound oxygen, sulfur, or nitrogen atoms, or by two such atoms singly-bound to the same carbon atom
    • C07D213/46Oxygen atoms
    • C07D213/50Ketonic radicals

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  • Organic Chemistry (AREA)
  • Pyridine Compounds (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Abstract

本发明公开了一种低成本1‑(4‑吡啶基)‑2‑丙酮的制备方法,该制备方法,先将吡啶和乙酰氯在二氯甲烷的存在条件下进行缩合反应,然后在碱液条件下反应得到产物,最后采用萃取、蒸馏即可得到最终产物。该方法采用廉价的传统化学试剂为原料,反应条件温和,操作简单,成本低。

Description

一种低成本1-(4-吡啶基)-2-丙酮的制备方法
技术领域
本发明涉及一种化工领域,尤其涉及一种低成本1-(4-吡啶基)-2-丙酮的制备方法。
背景技术
1-(4-吡啶基)-2-丙酮是重要的药物中间体,用于制备首选强心药米力农药物中间体。
传统制备路线:
传统制备过程中使用苯基锂或LDA做试剂,这两种试剂价格昂贵,且使用具有一定的危险性,反应条件苛刻,一般不推荐使用。鉴于以上缺陷,有必要对1-(4-吡啶基)-2-丙酮的制备方法做进一步的研究。
发明内容
基于背景技术存在的技术问题,本发明提出了一种低成本1-(4-吡啶基)-2-丙酮的制备方法。该制备工艺优势:采用廉价的传统化学试剂为原料,反应条件温和,操作简单,成本低。
本发明的技术方案如下:
一种低成本1-(4-吡啶基)-2-丙酮的制备方法,包括以下步骤:
A、先将吡啶和二氯甲烷加入到釜中,控温25-30℃,慢慢滴加乙酰氯和二氯甲烷的混合液,加毕,控温30-35℃反应18-21h;
B、再控温25-30℃,缓慢滴加30-40%碱液至pH≥12,加毕,控温30℃反应5.5-6.5h;
C、分层,收集下层二氯甲烷层,水相再用二氯甲烷萃取一次,有机层先常压蒸馏回收二氯甲烷至110℃,再减压蒸馏收集130-140℃之间的馏分。
优选的,所述的步骤A中,所述的反应时间为20h。
优选的,所述的步骤B中,所述的碱液为氢氧化钠,浓度为35%。
优选的,所述的步骤C中,所述的减压蒸馏的压力为-0.05~-0.10MPa。
本发明的化学反应式如下:
本发明的有益之处在于:本发明的制备方法,先将吡啶和乙酰氯在二氯甲烷的存在条件下进行缩合反应,然后在碱液条件下反应得到产物,最后采用萃取、蒸馏即可得到最终产物。该方法采用廉价的传统化学试剂为原料,反应条件温和,操作简单,成本低。
具体实施方式
实施例1:
一种低成本1-(4-吡啶基)-2-丙酮的制备方法,包括以下步骤:
A、先将吡啶100kg和400kg二氯甲烷加入到釜中,控温25-30℃,慢慢滴加乙酰氯75kg和二氯甲烷75kg的混合液,加毕,控温30-35℃反应20h;
B、再控温25-30℃,缓慢滴加35%液碱至pH≥12,加毕,控温30℃反应6h;
C、分层,收集下层二氯甲烷层,水相再用250kg二氯甲烷萃取一次,有机层先常压蒸馏回收二氯甲烷至110℃,再减压蒸馏(-0.08MPa)收集130-140℃之间的馏分。收率为85.7%
实施例2:
一种低成本1-(4-吡啶基)-2-丙酮的制备方法,包括以下步骤:
A、先将吡啶100kg和400kg二氯甲烷加入到釜中,控温25-30℃,慢慢滴加乙酰氯75kg和二氯甲烷75kg的混合液,加毕,控温30-35℃反应21h;
B、再控温25-30℃,缓慢滴加30%液碱至pH≥12,加毕,控温30℃反应6.5h;
C、分层,收集下层二氯甲烷层,水相再用250kg二氯甲烷萃取一次,有机层先常压蒸馏回收二氯甲烷至110℃,再减压蒸馏(-0.05MPa)收集130-140℃之间的馏分。收率为85.2%
实施例3:
一种低成本1-(4-吡啶基)-2-丙酮的制备方法,包括以下步骤:
A、先将吡啶100kg和400kg二氯甲烷加入到釜中,控温25-30℃,慢慢滴加乙酰氯75kg和二氯甲烷75kg的混合液,加毕,控温30-35℃反应18h;
B、再控温25-30℃,缓慢滴40%液碱至pH≥12,加毕,控温30℃反应5.5h;
C、分层,收集下层二氯甲烷层,水相再用250kg二氯甲烷萃取一次,有机层先常压蒸馏回收二氯甲烷至110℃,再减压蒸馏(-0.10MPa)收集130-140℃之间的馏分。收率为85.1%
对比实施例1
将实施例1中步骤B中的反应时间进行调节,研究其对最终产物收率的影响。
反应时间h 17 18 19 20 21
收率% 82.1 84.3 85.2 85.7 85.8
由以上检测数据可以知道,将反应时间调整到20h以上,再增加反应时间,对最终产物的收率没有直接影响,故考虑成本,最优化的反应时间为20h。
对比实施例2
将实施例1中步骤B中的氢氧化钠浓度进行调节,研究其对最终产物收率的影响。
浓度% 26 29 32 35 37 41
收率% 82.7 84.0 85.1 85.7 85.2 84.3
由以上检测数据可以知道,将氢氧化钠的浓度调高或者调低后,对最终产物的收率均有影响,故最优化的氢氧化钠的浓度为35%。
对比实施例3
将实施例1中步骤C中的减压蒸馏的压力进行调节,研究其对最终产物收率和抽滤时间的影响。
压力MPa -0.02 -0.05 -0.08 -0.10 -0.15
收率% 85.8 85.7 85.7 85.7 85.7
时间min 18 13 8 7 7
由以上检测数据可以知道,将减压蒸馏的压力对反应的收率没有影响,但对抽滤的时间有较大影响,故考虑成本,最优化的减压蒸馏的压力为-0.08MPa。
此检测数据只针对上述检测样品。
以上所述,仅为本发明较佳的具体实施方式,但本发明的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,根据本发明的技术方案及其发明构思加以等同替换或改变,都应涵盖在本发明的保护范围之内。

Claims (4)

1.一种低成本1-(4-吡啶基)-2-丙酮的制备方法,其特征在于,包括以下步骤:
A、先将吡啶和二氯甲烷加入到釜中,控温25-30℃,慢慢滴加乙酰氯和二氯甲烷的混合液,加毕,控温30-35℃反应18-21h;
B、再控温25-30℃,缓慢滴加30-40%碱液至pH≥12,加毕,控温30℃反应5.5-6.5h;
C、分层,收集下层二氯甲烷层,水相再用二氯甲烷萃取一次,有机层先常压蒸馏回收二氯甲烷至110℃,再减压蒸馏收集130-140℃之间的馏分。
2.如权利要求1所述的低成本1-(4-吡啶基)-2-丙酮的制备方法,其特征在于,所述的步骤A中,所述的反应时间为20h。
3.如权利要求1所述的低成本1-(4-吡啶基)-2-丙酮的制备方法,其特征在于,所述的步骤B中,所述的碱液为氢氧化钠,浓度为35%。
4.如权利要求1所述的低成本1-(4-吡啶基)-2-丙酮的制备方法,其特征在于,所述的步骤C中,所述的减压蒸馏的压力为-0.05~-0.10MPa。
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JPS50129571A (zh) * 1974-03-28 1975-10-13
US4681944A (en) * 1985-06-11 1987-07-21 Ippolito Robert M Process for preparing certain 1-lower alkanoyl or benzoyl-4-(lower alkanoyl or benzoyl-methylidene)-1,4-dihydropyridines or acid addition salts thereof
CN104387320A (zh) * 2014-09-28 2015-03-04 湖州展望药业有限公司 一种高纯度米力农的制备方法
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Patent Citations (4)

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JPS50129571A (zh) * 1974-03-28 1975-10-13
US4681944A (en) * 1985-06-11 1987-07-21 Ippolito Robert M Process for preparing certain 1-lower alkanoyl or benzoyl-4-(lower alkanoyl or benzoyl-methylidene)-1,4-dihydropyridines or acid addition salts thereof
CN104387320A (zh) * 2014-09-28 2015-03-04 湖州展望药业有限公司 一种高纯度米力农的制备方法
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