CN105523998B - 一种甲巯咪唑的制备工艺 - Google Patents

一种甲巯咪唑的制备工艺 Download PDF

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CN105523998B
CN105523998B CN201510960975.3A CN201510960975A CN105523998B CN 105523998 B CN105523998 B CN 105523998B CN 201510960975 A CN201510960975 A CN 201510960975A CN 105523998 B CN105523998 B CN 105523998B
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methimazole
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imidazole
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CN105523998A (zh
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杨冰
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Chongqing Woken New Material Technology Co ltd
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    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D233/00Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings
    • C07D233/54Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members
    • C07D233/66Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members 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
    • C07D233/84Sulfur atoms

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Abstract

本发明提供的甲巯咪唑的制备工艺,包括以下步骤:1)以1‑甲基‑1,3‑2H‑咪唑‑2‑酮为原料,在反应溶剂的配合下经过硫化试剂硫化得到甲巯咪唑粗品;2)将步骤1)中所得粗品经重结晶得到成品。本发明以1‑甲基‑1,3‑2H‑咪唑‑2‑酮为原料,利用常见的硫化试剂进行硫化,可得到颜色浅、纯度高、金属离子含量低的甲巯咪唑,整个制备工艺简单,操作简便,成本较低,适于工业推广应用。

Description

一种甲巯咪唑的制备工艺
技术领域
本发明涉及一种甲巯咪唑的制备工艺,属于有机合成技术领域。
背景技术
甲巯咪唑是抗甲状腺的一线药物,同时被大量应用到电子化学品中;甲巯咪唑的化学名为2-巯基-1-甲基咪唑。
现有公开的甲巯咪唑的合成工艺(J.Am.Chem.Soc.,71,4000,1949; US4628108;JP2004143056;CN10321421),基本上都是由甲胺乙缩醛与硫氰化钾在盐酸存在下反应制得的。这种传统的制备工艺,虽说可以制备得到医药级的甲巯咪唑,但是所得到的甲巯咪唑颜色较深,纯度很难做到99.5%以上,单杂较难满足最新药典要求,同时所含金属离子浓度较高,没有办法满足较高级别的医药,特别是电子化学品方面的用途。
如果要想满足这些较高方面的要求,就必须对传统方法所得到的甲巯咪唑进行多次重结晶、脱色以及脱金属离子等物理方面的处理,这样会导致甲巯咪唑的精制收率低,并且工序较为复杂,对设备的要求较高,从而造成制备颜色浅、纯度高、离子含量低的甲巯咪唑的工业化成本很高,因此,研发一种新的制备工艺显得尤为必要。
发明内容
针对上述现有技术中的不足之处,本发明提供一种颜色浅、纯度高、金属离子含量低的甲巯咪唑的制备工艺。
为了实现上述目的,本发明提供以下技术方案:一种甲疏咪唑的制备工艺,包括以下步骤:
1)以1-甲基-1,3-2H-咪唑-2-酮为原料,在反应溶剂的配合下经过硫化试剂硫化得到甲疏咪唑粗品;
2)将步骤1)中所得粗品经重结晶得到成品。
作为优选,所述硫化试剂为五硫化二磷。
作为优选,所述硫化试剂为五硫化二磷,此时使用二氯甲烷、氯仿、甲苯为溶剂,在催化剂六甲基二硅氧烷的催化下进行硫化,反应温度为20-80摄氏度。
作为优选,所述重结晶溶剂为甲醇、乙醇及异丙醇。
通过以上技术方案可以看出,本发明以以1-甲基-1,3-2H-咪唑-2-酮为原料,利用常见的硫化试剂进行硫化,可得到颜色浅、纯度高、金属离子含量低的甲疏咪唑,整个制备工艺简单,抄作简便,成本较低,适于工业推广应用。
具体实施方式
下面结合具体实施例来进一步详细说明本发明。
一种甲疏咪唑的制备工艺,包括以下步骤:1)以1-甲基-1,3-2H-咪唑-2-酮为原料;2)在反应溶剂的配合下经过硫化试剂硫化得到甲疏咪唑粗品;3)将步骤2) 中所得粗品经重结晶得到成品;
实施例1
在2L干燥的反应瓶中,投入1-甲基-1,3-2H-咪唑-2-酮166克,再加入113 克的五硫化二磷,同时加入230克六甲基二硅氧烷,之后再加入1500克的二氯甲烷,搅拌30分钟后升温至回流;保持回流反应16小时;取样HPLC中控至反应完全;反应完全后,常压回收二氯甲烷至体系变粘稠,趁热加入310克的异丙醇,同时加入5克活性炭,继续蒸馏溶剂至内温升至50度以上,趁热过滤;滤液慢慢冷却到10度以下结晶;过滤并经冷的异丙醇洗涤后得甲巯咪唑湿品,经真空干燥后得163克甲巯咪唑;收率为84%;所得甲巯咪唑颜色为白色晶体,HPLC纯度99.8%,常见金属离子含量均小于1000ppb。
以上对本发明实施例所提供的技术方案进行了详细介绍,本文中应用了具体个例对本发明实施例的原理以及实施方式进行了阐述,以上实施例的说明只适用于帮助理解本发明实施例的原理;同时,对于本领域的一般技术人员,依据本发明实施例,在具体实施方式以及应用范围上均会有改变之处,综上所述,本说明书内容不应理解为对本发明的限制。

Claims (1)

1.一种甲巯 咪唑的制备工艺,其特征在于:包括以下步骤:
在2L干燥的反应瓶中,投入1-甲基-1,3-2H-咪唑-2-酮166克,再加入113克的五硫化二磷,同时加入230克六甲基二硅氧烷,之后再加入1500克的二氯甲烷,搅拌30分钟后升温至回流;保持回流反应16小时;取样HPLC中控至反应完全;反应完全后,常压回收二氯甲烷至体系变粘稠,趁热加入310克的异丙醇,同时加入5克活性炭,继续蒸馏溶剂至内温升至50度以上,趁热过滤;滤液慢慢冷却到10度以下结晶;过滤并经冷的异丙醇洗涤后得甲巯咪唑湿品,经真空干燥后得163克甲巯咪唑。
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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102503896A (zh) * 2011-10-25 2012-06-20 西北农林科技大学 甲基丙烯酰基苯并咪唑(硫)酮衍生物及其作为抗菌药物的用途

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EP1866313A1 (en) * 2005-03-31 2007-12-19 Istituto di Richerche di Biologia Molecolare P. Angeletti S.p.A. Hiv integrase inhibitors

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102503896A (zh) * 2011-10-25 2012-06-20 西北农林科技大学 甲基丙烯酰基苯并咪唑(硫)酮衍生物及其作为抗菌药物的用途

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A Directed Metalation Route to the Selenium Analogue of Methimazole;Lynn James Guziec, et al.;《J. Org. Chem.》;19941231;第59卷(第16期);4691-4692 *
RECYCLIZATION OF 4,5-DIPHENYLOXAZOLIN-2-ONE AND -2-THIONE UNDER THE INFLUENCE OF AMINES;V. B. Kalcheva, et al.;《Chemistry of Heterocyclic Compounds》;19810831;第17卷(第8期);756-758 *
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