CN105837480A - 一种不对称芳香硫醚的制备方法 - Google Patents

一种不对称芳香硫醚的制备方法 Download PDF

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CN105837480A
CN105837480A CN201610197040.9A CN201610197040A CN105837480A CN 105837480 A CN105837480 A CN 105837480A CN 201610197040 A CN201610197040 A CN 201610197040A CN 105837480 A CN105837480 A CN 105837480A
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陆国平
张啸
田仁杰
许晓庆
吴统波
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Nanjing University of Science and Technology
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    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C319/00Preparation of thiols, sulfides, hydropolysulfides or polysulfides
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    • 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

本发明公开了一种不对称芳香硫醚的制备方法,其步骤为:将芳基硫酚或者烷基硫醇、卤代芳烃和碱依次加入反应容器中,最后加入咪唑类离子液体作为溶剂并搅拌反应;反应结束后加入乙酸乙酯,通过分液回收离子液体,旋蒸除去溶剂,经柱层析硅胶得到目标产物。本发明采用咪唑类离子液体作为反应介质,反应条件较为温和,无需使用过渡金属催化剂;反应产率高,底物耐受性好。

Description

一种不对称芳香硫醚的制备方法
技术领域
本发明属于绿色化学技术领域,具体涉及离子液体的使用及对C-S键构建促进的研究。
背景技术
有机硫化物在医药、农药以及化学合成中有十分重要的应用价值。据统计,治疗12类主要疾病的1969种药物中,含硫的药物占到了24.6%,从1930年到2010年这八十年间陆续有大量的含硫药物被开发利用。有机硫化物可以用于材料物理、电子和表面性质的改性,因此其在材料也有广泛的应用价值。其中不对称芳基硫醚是一类重要的含硫化合物,其在有机合成和医药领域都有广泛的应用价值。
在已经报道的不对称芳香硫醚的制备方法中,以硫醇和芳基卤代烃为原料通过过渡金属催化的交叉偶联反应制备(Org. Lett. 2014, 16, 1196)应用最为广泛,该方法主要是通过选用一些有效的过渡金属,在硫醇与卤代芳烃的交叉偶联反应中起到催化的作用。然而虽然它的反应条件较为温和,产率也很可观,由于使用了过渡金属,后续处理较为复杂,对环境也会有一定的影响。
发明内容
本发明的目的是提供一种不对称芳香硫醚的制备方法,其副反应较少,产率较高,反应介质可以回收套用,对设备的要求也不高。
实现本发明目的的技术解决方案是:一种不对称芳香硫醚的制备方法,包括如下步骤:
将芳基硫酚或者烷基硫醇、卤代芳烃和碱依次加入反应容器中,最后加入咪唑类离子液体作为溶剂并搅拌反应;反应结束后加入乙酸乙酯,通过分液回收离子液体,所得乙酸乙酯相旋蒸除去溶剂,经柱层析硅胶得到不对称芳香硫醚。
上述制备步骤中,所述的芳基硫酚为对甲苯硫酚,烷基硫醇为苄硫醇、环己硫醇中的一种。
上述制备步骤中,所述的卤代芳烃为邻氟硝基苯、对氟硝基苯、对氯硝基苯、邻氯硝基苯、2-氟吡啶、5-氟-2-硝基苯酚或4-氟苯甲酸甲酯中的一种。
上述制备步骤中,所述的卤代芳烃与芳烃硫酚或烷烃硫醇的摩尔比为1:1~1.2。
上述制备步骤中,所述的碱为碳酸钾、碳酸钠、碳酸铯、DBU(1,8-二氮杂二环十一碳-7-烯)或磷酸三钾中的一种。
上述制备步骤中,碱的量为卤代芳烃的1~3倍当量。
上述制备步骤中,所述的咪唑类离子液体为[Omim]Br。
上述制备步骤中,所述的反应温度为80~120 oC。
上述制备步骤中,所述的反应时间为6~12 h。
本发明与现有技术相比,有以下显著的特点:
(1) 咪唑类离子液体作为反应介质具有廉价、低挥发性和可回收等优点;
(2) 反应条件较为温和,无需使用强碱或者过渡金属催化剂;
(3) 反应产率高,底物耐受性好,具有一定的工业化前景。
具体实施方式
下面通过具体实施方式对本发明做进一步详细的说明。
实施例1
本实施例使用的反应物为邻氟硝基苯和对甲基苯硫酚,分子量分别为170和124。
在装有转子搅拌的35 mL容量的耐压管中先加入2 mL离子液体,再加入邻氟硝基苯1.0 mmol,对甲苯硫酚1.2 mmol,最后加入2.0 mmol碱,在80 oC的条件下反应8 h。反应结束后,将反应混合液降至室温,加入乙酸乙酯,通过分液回收离子液体,所得乙酸乙酯相旋蒸除去溶剂,经柱层析硅胶得到不对称芳香硫醚1a,收率96%。
实施例2
本实施例使用的反应物为2-氟-5-硝基苯胺和对甲基苯硫酚,分子量分别为156和124。
在装有转子搅拌的35 mL容量的耐压管中先加入2 mL离子液体,再加入加入2-氟-5-硝基苯胺1.0 mmol,对甲苯硫酚1.2 mmol,最后加入2.0 mmol碱,在80oC的条件下反应8h。反应结束后,将反应混合液降至室温,加入乙酸乙酯,通过分液回收离子液体,所得乙酸乙酯相旋蒸除去溶剂,经柱层析硅胶得到不对称芳香硫醚1b,收率93%。
实施例3
本实施例使用的反应物为3-氯-2-氟硝基苯和对甲基苯硫酚,分子量分别为175.5和124。
在装有转子搅拌的35 mL容量的耐压管中先加入2 mL离子液体,再加入3-氯-2-氟硝基苯1.0 mmol,对甲苯硫酚1.2 mmol,最后加入2.0 mmol碱,在80oC的条件下反应8h。反应结束后,将反应混合液降至室温,加入乙酸乙酯,通过分液回收离子液体,所得乙酸乙酯相旋蒸除去溶剂,经柱层析硅胶得到不对称芳香硫醚1c,收率93%。
实施例4
本实施例使用的反应物为邻氟硝基苯和苄硫醇,分子量分别为170和124。
在装有转子搅拌的35 mL容量的耐压管中先加入2 mL离子液体,再加入邻氟硝基苯1.0 mmol,苄硫醇1.2 mmol,最后加入2.0 mmol碱,在80oC的条件下反应8h。反应结束后,将反应混合液降至室温,加入乙酸乙酯,通过分液回收离子液体,所得乙酸乙酯相旋蒸除去溶剂,经柱层析硅胶得到不对称芳香硫醚1d,收率95%。
实施例5
本实施例使用的反应物为邻氟硝基苯和环己硫醇,分子量分别为170和116。
在装有转子搅拌的35 mL容量的耐压管中先加入2 mL离子液体,再加入邻氟硝基苯1.0 mmol,环己硫醇1.2 mmol,最后加入2.0 mmol碱,在80oC的条件下反应8h。反应结束后,将反应混合液降至室温,加入乙酸乙酯,通过分液回收离子液体,所得乙酸乙酯相旋蒸除去溶剂,经柱层析硅胶得到不对称芳香硫醚1e,收率96%。
实施例6
本实施例使用的反应物为对氯硝基苯和对甲苯硫酚,分子量分别为157.5和124。
在装有转子搅拌的35 mL容量的耐压管中先加入2 mL离子液体,再加入对氯硝基苯1.0 mmol,对甲苯硫酚1.2 mmol,最后加入2.0 mmol碱,在120℃的条件下反应8h。反应结束后,将反应混合液降至室温,加入乙酸乙酯,通过分液回收离子液体,所得乙酸乙酯相旋蒸除去溶剂,经柱层析硅胶得到不对称芳香硫醚1f,收率94%。
实施例7
本实施例使用的反应物为2-氟吡啶和对甲苯硫酚,分子量分别为97和124。
在装有转子搅拌的35 mL容量的耐压管中先加入2 mL离子液体,再加入2-氟吡啶1.0 mmol,对甲苯硫酚1.2 mmol,最后加入2.0 mmol碱,在80oC的条件下反应8h。反应结束后,将反应混合液降至室温,加入乙酸乙酯,通过分液回收离子液体,所得乙酸乙酯相旋蒸除去溶剂,经柱层析硅胶得到不对称芳香硫醚1g,收率83%。
实施例8
本实施例使用的反应物为5-氟-2-硝基苯酚和对甲苯硫酚,分子量分别为157和124。
在装有转子搅拌的35 mL容量的耐压管中先加入2 mL离子液体,再加入5-氟-2-硝基苯酚1.0 mmol,对甲苯硫酚1.2 mmol,最后加入2.0 mmol碱,在80oC的条件下反应8h。反应结束后,将反应混合液降至室温,加入乙酸乙酯,通过分液回收离子液体,所得乙酸乙酯相旋蒸除去溶剂,经柱层析硅胶得到不对称芳香硫醚1h,收率86%。
实施例9
本实施例使用的反应物为4-氟苯甲酸甲酯和对甲苯硫酚,分子量分别为154和124。
在装有转子搅拌的35 mL容量的耐压管中先加入2 mL离子液体,再加入4-氟苯甲酸甲酯1.0 mmol,对甲苯硫酚1.2 mmol,最后加入2.0 mmol碱,在80oC的条件下反应8h。反应结束后,将反应混合液降至室温,加入乙酸乙酯,通过分液回收离子液体,所得乙酸乙酯相旋蒸除去溶剂,经柱层析硅胶得到不对称芳香硫醚1i,收率81%。
发明人还尝试过不同碳链长度的咪唑类离子液体,在实际操作和结果的对比中发现其他离子液体与[Omim]Br有着较为明显的差别,最主要的是流动性与[Omim]Br相比差了很多,在前期加料与后续处理中产生很大的不便,并且由于流动性较差,也会导致反应搅拌较为困难,产率会受到一定的影响,因此发明人最终选择了[Omim]Br作为该反应的溶剂。
上述实施例仅是对本发明产品的说明,并非对本发明做出任何形式上的限制,在不脱离本发明的技术方案范围之内,任何利用上述揭示的技术内容作出简单变换的等同方案,均属本发明的保护范围。

Claims (9)

1.一种不对称芳香硫醚的制备方法,其特征在于,包括如下步骤:
将芳基硫酚或者烷基硫醇、卤代芳烃和碱依次加入反应容器中,最后加入咪唑类离子液体作为溶剂并搅拌反应;反应结束后加入乙酸乙酯,通过分液回收离子液体,旋蒸除去溶剂,经柱层析硅胶得到目标产物。
2.如权利要求1所述的不对称芳香硫醚的制备方法,其特征在于,所述的芳基硫酚为对甲苯硫酚,烷基硫醇为苄硫醇、环己硫醇中的一种。
3.如权利要求1所述的不对称芳香硫醚的制备方法,其特征在于,所述的卤代芳烃为邻氟硝基苯、对氟硝基苯、对氯硝基苯、邻氯硝基苯、2-氟吡啶、5-氟-2-硝基苯酚或4-氟苯甲酸甲酯中的一种。
4.如权利要求1所述的不对称芳香硫醚的制备方法,其特征在于,所述的碱为碳酸钾、碳酸钠、碳酸铯、1,8-二氮杂二环十一碳-7-烯或磷酸三钾中的一种。
5.如权利要求1所述的不对称芳香硫醚的制备方法,其特征在于,所述的咪唑类离子液体为[Omim]Br。
6.如权利要求1所述的不对称芳香硫醚的制备方法,其特征在于,所述的卤代芳烃与芳烃硫酚或烷烃硫醇的摩尔比为1:1~1.2。
7.如权利要求1所述的不对称芳香硫醚的制备方法,其特征在于,碱的量为卤代芳烃的1~3倍当量。
8.如权利要求1所述的不对称芳香硫醚的制备方法,其特征在于,反应温度为80~120oC。
9.如权利要求1所述的不对称芳香硫醚的制备方法,其特征在于,反应时间为6~12 h。
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CN106543051A (zh) * 2016-10-21 2017-03-29 南京理工大学 一种芳香硫醚类化合物的制备方法
CN108503643A (zh) * 2017-02-28 2018-09-07 泉州易初生物医药科技有限公司 蛋白酶抑制剂的制备方法
CN108503643B (zh) * 2017-02-28 2020-09-15 泉州易初生物医药科技有限公司 蛋白酶抑制剂的制备方法
CN109111405A (zh) * 2018-10-22 2019-01-01 南开大学 一种芳香硫醚类化合物及其农药和医药用途
CN109111405B (zh) * 2018-10-22 2021-07-30 南开大学 一种芳香硫醚类化合物及其农药和医药用途
CN111233721A (zh) * 2018-11-28 2020-06-05 沈阳科创化学品有限公司 一种2-烷硫基-6-卤代烷基苯的合成方法
CN111233721B (zh) * 2018-11-28 2022-12-13 沈阳科创化学品有限公司 一种2-烷硫基-6-卤代烷基苯的合成方法

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