WO2022178694A1 - 可见光下制备烷基苯并噻唑衍生物的方法 - Google Patents

可见光下制备烷基苯并噻唑衍生物的方法 Download PDF

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WO2022178694A1
WO2022178694A1 PCT/CN2021/077532 CN2021077532W WO2022178694A1 WO 2022178694 A1 WO2022178694 A1 WO 2022178694A1 CN 2021077532 W CN2021077532 W CN 2021077532W WO 2022178694 A1 WO2022178694 A1 WO 2022178694A1
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reaction
bromophenyl
alkylbenzothiazole
visible light
alkyl
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PCT/CN2021/077532
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French (fr)
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李红喜
王昊
李海燕
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苏州大学
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D277/00—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings
    • C07D277/60—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings condensed with carbocyclic rings or ring systems
    • C07D277/62—Benzothiazoles
    • C07D277/64—Benzothiazoles with only hydrocarbon or substituted hydrocarbon radicals attached in position 2
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D277/00—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings
    • C07D277/60—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings condensed with carbocyclic rings or ring systems
    • C07D277/62—Benzothiazoles
    • C07D277/64—Benzothiazoles with only hydrocarbon or substituted hydrocarbon radicals attached in position 2
    • C07D277/66—Benzothiazoles with only hydrocarbon or substituted hydrocarbon radicals attached in position 2 with aromatic rings or ring systems directly attached in position 2

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  • the invention belongs to the technical field of organic chemical synthesis methodology, in particular to a method for preparing alkylbenzothiazole derivatives from N-(2-bromophenyl)alkylthioamides promoted by visible light.
  • alkylbenzothiazole derivatives in the prior art occurs under the irradiation of visible or ultraviolet light, under the catalysis of transition metal complexes such as [Ru(bpy) 3 ] 2+ , [Ir(ppy) 3 ] or organic photosensitizers .
  • the present invention discloses a brand-new visible light-promoted method for preparing alkylbenzothiazole derivatives from N-(2-bromophenyl)alkylthioamides.
  • the reaction of the present invention is carried out without photosensitizer or transition metal catalyst, which effectively solves the problem of the need for auxiliary (transition) catalyst in the prior art; the reaction can occur immediately after being irradiated by a simple 45W household compact fluorescent lamp, and unexpected results are obtained. technical effect.
  • the present invention adopts the following technical scheme: a method for preparing alkylbenzothiazole derivatives from N-(2-bromophenyl)alkylthioamide promoted by visible light, comprising the following steps: under visible light irradiation, in a base In the presence of N-(2-bromophenyl)alkylthioamide as raw material, alkylbenzothiazole derivatives are prepared by reaction.
  • the reaction is carried out at room temperature for 20-30 hours; the reaction is carried out in a solvent under the protection of an inert gas.
  • the molar ratio of N-(2-bromophenyl)alkylthioamide and base is 1:(0.4-0.6), preferably 1:0.5.
  • N-(2-bromophenyl) alkyl thioamide has the general structural formula shown in any one of formula (M) ⁇ formula (O): .
  • R 8 is selected from methyl, n-propyl or tert-butyl
  • R 9 is selected from fluorine, chlorine, bromine or methyl.
  • the inert gas is selected from any one of nitrogen, helium, neon, and argon, preferably nitrogen;
  • the base is any one of inorganic bases, and the inorganic base is selected from sodium phosphate, sodium carbonate , any one of potassium carbonate, potassium hydroxide, sodium hydroxide, and sodium acetate, preferably sodium phosphate;
  • the solvent is dimethyl sulfoxide (DMSO), DMF, tetrahydrofuran (THF), methanol, ethanol, acetonitrile (MeCN), etc. .
  • the present invention that adopts the above-mentioned technical scheme has the following advantages: the present invention, without adding any photosensitizer or transition metal catalyst, uses sodium phosphate as an alkali, and under the irradiation of a 45W household compact fluorescent lamp, realizes A series of intramolecular cross-coupling reactions of N-(2-bromophenyl)alkylthioamides. Furthermore, the present invention can obtain alkylbenzothiazole derivatives in high yield. The whole process is green, efficient and easy to operate, and it is a good method for the synthesis of alkylbenzothiazole derivatives.
  • the present invention can obtain alkylbenzothiazole derivatives simply and efficiently without other reagents and reaction steps.
  • the stirring device is a magnetic stirring device; the reaction vessel is a sealed reaction tube.
  • the bromine site in the N-(2-bromophenyl)alkylthioamide reacts with the sulfur site to prepare the alkylbenzothiazole derivatives, and the reaction is clear.
  • the present invention will be further described below with reference to specific embodiments. Unless otherwise specified, the reagents, materials, instruments, etc. used in the following examples are all commercially available.
  • the reaction of the present invention is carried out in the absence of photosensitizer or transition metal catalyst, and only N-(2-bromophenyl)alkylthioamide, inorganic base and DMSO are used as raw materials; the reaction in the embodiment of the present invention is carried out at room temperature , using a 45W household compact fluorescent lamp as the visible light source.
  • the specific experiments and testing methods of the present invention are conventional techniques.
  • Example 1 Visible light promotes the reaction of N-(2-bromophenyl)thiobenzamide. .
  • Example 2 Visible light promoted N-(2-bromophenyl)thioacetamide reaction.
  • N-( 2 -Bromophenyl)thioacetamide (0.2 mmol), Na3PO4 (0.1 mmol), and DMSO ( 2 mL) were added to a dry reaction tube with a magnetic stirrer bar and the reaction was continued The tube was replaced with N 3 times, and the reaction was stirred for 24 h under the irradiation of a 45W household compact fluorescent lamp. After the reaction, 4 mL of water was added, then extracted with 3 ⁇ 4 mL of ethyl acetate, the organic phases were combined, the organic phases were dried over anhydrous sodium sulfate, filtered, the filtrate was concentrated by rotary evaporation, and separated by thin-layer chromatography on silica gel. , the target product was obtained with a yield of 41%.
  • Example 3 Visible light promoted N-(2-bromophenyl)thiobutanamide reaction.
  • N-(2-Bromophenyl) thiobutanamide (0.2 mmol), Na3PO4 (0.1 mmol), and DMSO ( 2 mL) were added to a dry reaction tube with a magnetic stir bar, and the reaction was continued The tube was replaced with N 3 times, and the reaction was stirred for 24 h under the irradiation of a 45W household compact fluorescent lamp. After the reaction, 4 mL of water was added, then extracted with 3 ⁇ 4 mL of ethyl acetate, the organic phases were combined, the organic phases were dried over anhydrous sodium sulfate, filtered, the filtrate was concentrated by rotary evaporation, and separated by thin-layer chromatography on silica gel. , the target product was obtained with a yield of 75%.
  • Example 4 Visible light-promoted reaction of N-(2-bromophenyl)-2,2-dimethylthiopropionamide.
  • N-(2-Bromophenyl)-2,2 - dimethylthiopropionamide (0.2 mmol), Na3PO4 (0.1 mmol), and DMSO ( 2 mL) were added to a dry solution with a magnetic stir bar Then, the reaction tube was replaced with N 3 times, and the reaction was stirred for 24 h under the irradiation of a 45W household compact fluorescent lamp. After the reaction, 4 mL of water was added, then extracted with 3 ⁇ 4 mL of ethyl acetate, the organic phases were combined, the organic phases were dried over anhydrous sodium sulfate, filtered, the filtrate was concentrated by rotary evaporation, and separated by thin-layer chromatography on silica gel. , the target product was obtained with a yield of 62%.
  • Example 5 Visible light promoted N-(2-bromo-5-methylphenyl)-2,2-dimethylthiopropionamide reaction.
  • Example 6 Visible light promoted N-(2-bromo-4-methylphenyl)-2,2-dimethylthiopropionamide reaction.
  • Example 7 Visible light-promoted reaction of N-(2-bromo-4-fluorophenyl)-2,2-dimethylthiopropionamide.
  • N-(2-Bromo- 4 -fluorophenyl)-2,2-dimethylthiopropionamide (0.2 mmol), Na3PO4 (0.1 mmol), and DMSO ( 2 mL) were added with magnetic
  • the reaction tube was then replaced with N 3 times, and the reaction was stirred for 24 h under the irradiation of a 45W household compact fluorescent lamp.
  • Example 8 Visible light-promoted reaction of N-(2-bromo-4-chlorophenyl)-2,2-dimethylthiopropionamide.
  • Example 9 Visible light-promoted reaction of N-(2,4-dibromophenyl)-2,2-dimethylthiopropionamide.
  • N-(2,4-Dibromophenyl)-2,2 - dimethylthiopropionamide (0.2 mmol), Na3PO4 (0.1 mmol), and DMSO ( 2 mL) were added with magnetic stirring
  • the reaction tube was then replaced with N 3 times, and the reaction was stirred for 24 h under the irradiation of a 45W household compact fluorescent lamp.
  • 4 mL of water was added, then extracted with 3 ⁇ 4 mL of ethyl acetate, the organic phases were combined, the organic phases were dried over anhydrous sodium sulfate, filtered, the filtrate was concentrated by rotary evaporation, and separated by thin-layer chromatography on silica gel. , the target product was obtained with a yield of 63%.
  • N-(2-bromophenyl) alkyl thioamides such as N-(2-bromophenyl) alkyl thioamide derivatives are used as raw materials, and sodium phosphate is used as alkali to successfully A series of 2-substituted alkylbenzothiazole derivatives were synthesized.
  • the reaction described in the present invention has a wide range of substrate application, and the desired alkylbenzothiazole derivative can be obtained in high yield.
  • the whole reaction process of the invention is green, efficient and easy to operate, and is a good method for synthesizing alkylbenzothiazole derivatives.

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  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

本发明公开了一种可见光下制备烷基苯并噻唑衍生物的方法，具体为在惰性气体保护下，将N-(2-溴苯基)烷基硫代酰胺、无机碱加入到配备搅拌装置的反应容器中，再加入二甲亚砜，于可见光照射下，室温搅拌反应24小时，得到烷基苯并噻唑衍生物。本发明在不添加任何光敏剂或者过渡金属催化剂的情况下，以磷酸钠作为碱，在45W家用紧凑型荧光灯照射下，实现了一系列N-(2-溴苯基)烷基硫代酰胺的分子内交叉偶联反应。此外，本发明可以高收率获得烷基苯并噻唑衍生物。整个过程绿色、高效且易于操作，是一种合成烷基苯并噻唑衍生物的好方法。

Description

可见光下制备烷基苯并噻唑衍生物的方法 技术领域
本发明属于有机化学合成方法学技术领域，具体涉及可见光促进的N-(2-溴苯基)烷基硫代酰胺制备烷基苯并噻唑衍生物的方法。
 背景技术
现有技术烷基苯并噻唑衍生物的制备在可见或紫外光照射下，在[Ru(bpy) 3] 2+，[Ir(ppy) 3]等过渡金属配合物或有机光敏剂催化下发生
Figure 934667dest_path_image001
。
但是该反应增加了额外的设备、试剂或分离成本，而且可能引入有毒的重金属或有机污染物。
 技术问题
为了克服上述技术问题，本发明公开了一种全新的可见光促进的由N-(2-溴苯基)烷基硫代酰胺制备烷基苯并噻唑衍生物的方法。
 技术解决方案
本发明的反应在无光敏剂或者过渡金属催化剂条件下进行，有效解决了现有技术需要辅助（过渡）催化剂的问题；可以利用简单的45W家用紧凑型荧光灯照射即发生反应，取得了预料不到的技术效果。
具体而言，本发明采用如下技术方案：可见光促进的N-(2-溴苯基)烷基硫代酰胺制备烷基苯并噻唑衍生物的方法，包括以下步骤，在可见光照射下，在碱存在下，以N-(2-溴苯基)烷基硫代酰胺为原料反应制备烷基苯并噻唑衍生物。
碱在以N-(2-溴苯基)烷基硫代酰胺为原料反应制备烷基苯并噻唑衍生物中的应用；优选的，反应在可见光下进行。
本发明中，所述反应为在室温下反应20～30小时；反应在惰性气体保护下，溶剂中进行。
本发明中，N-(2-溴苯基)烷基硫代酰胺、碱的摩尔比为1:（0.4～0.6），优选为1:0.5。
本发明中，所述N-(2-溴苯基)烷基硫代酰胺具有如式（M）~式（O）中的任意一种所示的结构通式：
Figure 64297dest_path_image002
。
烷基苯并噻唑衍生物的化学结构式如下：
Figure 675407dest_path_image003
。
其中：R 8选自甲基、正丙基或者叔丁基；R 9选自氟、氯、溴或者甲基。
本发明中，惰性气体选自氮气、氦气、氖气、氩气中的任意一种，优选氮气；所述碱为无机碱中的任意一种，所述无机碱选自磷酸钠、碳酸钠、碳酸钾、氢氧化钾、氢氧化钠、醋酸钠中的任意一种，优选磷酸钠；溶剂为二甲亚砜（DMSO）、DMF、四氢呋喃（THF）、甲醇、乙醇、乙腈（MeCN）等。
 有益效果
与现有技术相比，采用上述技术方案的本发明具有下列优点：本发明在不添加任何光敏剂或者过渡金属催化剂的情况下，以磷酸钠作为碱，在45W家用紧凑型荧光灯照射下，实现了一系列N-(2-溴苯基)烷基硫代酰胺的分子内交叉偶联反应。此外，本发明可以高收率获得烷基苯并噻唑衍生物。整个过程绿色、高效且易于操作，是一种合成烷基苯并噻唑衍生物的好方法。
 本发明的实施方式
本发明公开的可见光促进的N-(2-溴苯基)烷基硫代酰胺制备烷基苯并噻唑衍生物的方法，具体为如下步骤：在惰性气体保护下，按照N-(2-溴苯基)烷基硫代酰胺:无机碱=1:0.5的摩尔比，将上述反应物加入到配备搅拌装置的反应容器中，再加入二甲亚砜，于45W家用紧凑型荧光灯照射下，室温搅拌反应24小时，得到烷基苯并噻唑衍生物。本发明无需其他试剂与反应步骤，可简单、高效的得到烷基苯并噻唑衍生物。所述搅拌装置为磁力搅拌装置；所述反应容器为密封反应管。
本发明中，N-(2-溴苯基)烷基硫代酰胺中的溴位点与硫位点反应制备烷基苯并噻唑衍生物，反应明确。下面将结合具体的实施例对本发明做出进一步的描述。除非另有说明，下列实施例中所使用的试剂、材料、仪器等均可通过商业手段获得。本发明的反应在无光敏剂或者过渡金属催化剂存在下进行，仅采用N-(2-溴苯基)烷基硫代酰胺、无机碱、DMSO为原料；本发明实施例的反应在室温下进行，使用45W家用紧凑型荧光灯为可见光源。本发明具体实验、测试方法为常规技术。
实施例1：可见光促进N-(2-溴苯基)硫代苯甲酰胺反应。
Figure 232290dest_path_image004
。
将N-(2-溴苯基)硫代苯甲酰胺（0.2 mmol），Na 3PO 4（0.1 mmol），以及DMSO（2 mL）加入带有磁力搅拌子的干燥的反应管中，接着该反应管用N 2置换3次，在45W家用紧凑型荧光灯照射下，搅拌反应5 h。反应结束后，加入4 mL水，然后用3×4 mL乙酸乙酯萃取，合并有机相，有机相再用无水硫酸钠干燥，过滤，滤液旋转蒸发浓缩后，经硅胶色谱薄层层析分离，得到目标产物，分离收率98%，HPLC收率99%。
1H NMR (400 MHz, CDCl 3, ppm) δ 8.09–8.07 (m, J = 7.7 Hz, 3H), 7.90 (d, J = 7.9 Hz, 1H), 7.49 (m, 4H), 7.38 (t, J = 7.5 Hz, 1H)。 13C NMR (101 MHz, CDCl 3, ppm) δ 168.1, 154.2, 135.1, 133.6, 131.0, 129.0, 127.6, 126.3, 125.2, 123.2, 121.6。
在上述实验基础上，改变单一条件，得到如下实验：将Na 3PO 4更换为Na 2CO 3或者Et 3N，其余不变，产物HPLC收率分别为86%、87%。
将Na 3PO 4用量更换为0.2当量，其余不变，产物HPLC收率为91%。
不加入Na 3PO 4，即没有碱，其余不变，产物HPLC收率为76%。
空气中反应，其余不变，产物HPLC收率为61%。
避光下，其余不变，得不到产物；避光80℃反应，依然没有产物。
将取代基溴更换为氯，其余不变，产物HPLC收率24%。
以下实施例涉及的产物收率都是分离收率。
实施例2：可见光促进N-(2-溴苯基)硫代乙酰胺反应。
Figure 171427dest_path_image005
。
将N-(2-溴苯基)硫代乙酰胺（0.2 mmol），Na 3PO 4（0.1 mmol），以及DMSO（2 mL）加入带有磁力搅拌子的干燥的反应管中，接着该反应管用N 2置换3次，在45W家用紧凑型荧光灯照射下，搅拌反应24 h。反应结束后，加入4 mL水，然后用3×4 mL乙酸乙酯萃取，合并有机相，有机相再用无水硫酸钠干燥，过滤，滤液旋转蒸发浓缩后，经硅胶色谱薄层层析分离，得到目标产物，收率41%。
1H NMR (400 MHz, CDCl 3, ppm) δ 7.95 (d, J = 7.9 Hz, 1H), 7.82 (d, J = 7.7 Hz, 1H), 7.44 (t, J = 7.3 Hz, 1H), 7.34 (t, J = 7.2 Hz, 1H), 2.84 (s, 3H)。 13C NMR (101 MHz, CDCl 3, ppm) δ 166.9, 153.4, 135.7, 125.9, 124.7, 122.4, 121.4, 20.1。
实施例3：可见光促进N-(2-溴苯基)硫代丁酰胺反应。
Figure 104748dest_path_image006
。
将N-(2-溴苯基)硫代丁酰胺（0.2 mmol），Na 3PO 4（0.1 mmol），以及DMSO（2 mL）加入带有磁力搅拌子的干燥的反应管中，接着该反应管用N 2置换3次，在45W家用紧凑型荧光灯照射下，搅拌反应24 h。反应结束后，加入4 mL水，然后用3×4 mL乙酸乙酯萃取，合并有机相，有机相再用无水硫酸钠干燥，过滤，滤液旋转蒸发浓缩后，经硅胶色谱薄层层析分离，得到目标产物，收率75%。
1H NMR (400 MHz, CDCl 3, ppm) δ 7.97 (d, J = 8.0 Hz, 1H), 7.83 (d, J = 7.8 Hz, 1H), 7.44 (t, J = 7.4 Hz, 1H), 7.33 (t, J = 7.4 Hz, 1H), 3.09 (t, J = 7.4 Hz, 2H), 1.90 (dt, J = 14.3, 7.1 Hz, 2H), 1.05 (t, J = 7.2 Hz, 3H)。 13C NMR (101 MHz, CDCl 3, ppm) δ 172.3, 153.4, 135.3, 126.0, 124.8, 122.7, 121.6, 36.4, 23.3, 13.9。
实施例4：可见光促进N-(2-溴苯基)-2,2-二甲基硫代丙酰胺反应。
Figure 570365dest_path_image007
。
将N-(2-溴苯基)-2,2-二甲基硫代丙酰胺（0.2 mmol），Na 3PO 4（0.1 mmol），以及DMSO（2 mL）加入带有磁力搅拌子的干燥的反应管中，接着该反应管用N 2置换3次，在45W家用紧凑型荧光灯照射下，搅拌反应24 h。反应结束后，加入4 mL水，然后用3×4 mL乙酸乙酯萃取，合并有机相，有机相再用无水硫酸钠干燥，过滤，滤液旋转蒸发浓缩后，经硅胶色谱薄层层析分离，得到目标产物，收率62%。
1H NMR (400 MHz, CDCl 3, ppm) δ 7.99 (d, J = 8.1 Hz, 1H), 7.85 (d, J = 7.9 Hz, 1H), 7.44 (t, J = 7.6 Hz, 1H), 7.33 (t, J = 7.5 Hz, 1H), 1.53 (s, 9H)。 13C NMR (101 MHz, CDCl 3, ppm) δ 181.9, 153.3, 135.0, 125.7, 124.5, 122.7, 121.4, 38.3, 30.8。
实施例5：可见光促进N-(2-溴-5-甲基苯基)-2,2-二甲基硫代丙酰胺反应。
Figure 298149dest_path_image008
。
将N-(2-溴-5-甲基苯基)-2,2-二甲基硫代丙酰胺（0.2 mmol），Na 3PO 4（0.1 mmol），以及DMSO（2 mL）加入带有磁力搅拌子的干燥的反应管中，接着该反应管用N 2置换3次，在45W家用紧凑型荧光灯照射下，搅拌反应24 h。反应结束后，加入4 mL水，然后用3×4 mL乙酸乙酯萃取，合并有机相，有机相再用无水硫酸钠干燥，过滤，滤液旋转蒸发浓缩后，经硅胶色谱薄层层析分离，得到目标产物，收率82%。
1H NMR (400 MHz, CDCl 3, ppm) δ 7.80 (s, 1H), 7.71 (d, J = 8.0 Hz, 1H), 7.16 (d, J = 8.0 Hz, 1H), 2.48 (s, 3H), 1.51 (s, 9H)。 13C NMR (101 MHz, CDCl 3, ppm) δ 182.0, 153.6, 135.7, 131.9, 126.0, 122.8, 120.9, 38.3, 30.7, 21.5。
在上述实验基础上，改变单一条件，得到如下实验：将DMSO更换为1 mL THF与1 mL乙腈的混合溶液，其余不变，产物收率为56%。将DMSO更换为1 mL THF与1 mL甲醇的混合溶液，其余不变，产物收率为32%。
实施例6：可见光促进N-(2-溴-4-甲基苯基)-2,2-二甲基硫代丙酰胺反应。
Figure 973850dest_path_image009
。
将N-(2-溴-4-甲基苯基)-2,2-二甲基硫代丙酰胺（0.2 mmol），Na 3PO 4（0.1 mmol），以及DMSO（2 mL）加入带有磁力搅拌子的干燥的反应管中，接着该反应管用N 2置换3次，在45W家用紧凑型荧光灯照射下，搅拌反应24 h。反应结束后，加入4 mL水，然后用3×4 mL乙酸乙酯萃取，合并有机相，有机相再用无水硫酸钠干燥，过滤，滤液旋转蒸发浓缩后，经硅胶色谱薄层层析分离，得到目标产物，收率73%。
1H NMR (400 MHz, CDCl 3, ppm) δ 7.86 (d, J = 8.1 Hz, 1H), 7.63 (s, 1H), 7.25 (d, J = 8.5 Hz, 1H), 2.47 (s, 3H), 1.51 (s, 9H)。 13C NMR (101 MHz, CDCl 3, ppm) δ 180.8, 151.3, 135.1, 134.5, 127.3, 122.1, 121.2, 38.2, 30.7, 21.4。
实施例7：可见光促进N-(2-溴-4-氟苯基)-2,2-二甲基硫代丙酰胺反应。
Figure 445283dest_path_image010
。
将N-(2-溴-4-氟苯基)-2,2-二甲基硫代丙酰胺（0.2 mmol），Na 3PO 4（0.1 mmol），以及DMSO（2 mL）加入带有磁力搅拌子的干燥的反应管中，接着该反应管用N 2置换3次，在45W家用紧凑型荧光灯照射下，搅拌反应24 h。反应结束后，加入4 mL水，然后用3×4 mL乙酸乙酯萃取，合并有机相，有机相再用无水硫酸钠干燥，过滤，滤液旋转蒸发浓缩后，经硅胶色谱薄层层析分离，得到目标产物，收率75%。
1H NMR (400 MHz, CDCl 3, ppm) δ 8.01 – 7.83 (m, 1H), 7.51 (d, J = 8.0 Hz, 1H), 7.17 (t, J = 8.8 Hz, 1H), 1.51 (s, 9H)。 13C NMR (101 MHz, CDCl 3, ppm) δ 181.5, 160.1 (d, 1J C-F = 244.5 Hz), 149.8 (d, 4J C-F = 1.3 Hz), 136.0 (d, 3J C-F = 11.0 Hz), 123.5 (d, 3J C-F = 9.3 Hz), 114.2 (d, 2J C-F = 24.6 Hz), 107.6 (d, 2J C-F = 26.7 Hz), 38.4, 30.7。 19F NMR (377 MHz, CDCl 3, ppm) δ -117.2。
实施例8：可见光促进N-(2-溴-4-氯苯基)-2,2-二甲基硫代丙酰胺反应。
Figure 968668dest_path_image011
。
将N-(2-溴-4-氯苯基)-2,2-二甲基硫代丙酰胺（0.2 mmol），Na 3PO 4（0.1 mmol），以及DMSO（2 mL）加入带有磁力搅拌子的干燥的反应管中，接着该反应管用N 2置换3次，在45W家用紧凑型荧光灯照射下，搅拌反应24 h。反应结束后，加入4 mL水，然后用3×4 mL乙酸乙酯萃取，合并有机相，有机相再用无水硫酸钠干燥，过滤，滤液旋转蒸发浓缩后，经硅胶色谱薄层层析分离，得到目标产物，收率70%。
1H NMR (400 MHz, CDCl 3, ppm) δ 7.88 (d, J = 8.6 Hz, 1H), 7.81 (s, 1H), 7.39 (d, J = 8.6 Hz, 1H), 1.51 (s, 9H)。 13C NMR (101 MHz, CDCl 3, ppm) δ 182.4, 151.8, 136.2, 130.4, 126.5, 123.4, 121.1, 38.4, 30.6。
实施例9：可见光促进N-(2,4-二溴苯基)-2,2-二甲基硫代丙酰胺反应。
Figure 195250dest_path_image012
。
将N-(2,4-二溴苯基)-2,2-二甲基硫代丙酰胺（0.2 mmol），Na 3PO 4（0.1 mmol），以及DMSO（2 mL）加入带有磁力搅拌子的干燥的反应管中，接着该反应管用N 2置换3次，在45W家用紧凑型荧光灯照射下，搅拌反应24 h。反应结束后，加入4 mL水，然后用3×4 mL乙酸乙酯萃取，合并有机相，有机相再用无水硫酸钠干燥，过滤，滤液旋转蒸发浓缩后，经硅胶色谱薄层层析分离，得到目标产物，收率63%。
1H NMR (400 MHz, CDCl 3, ppm) δ 7.97 (s, 1H), 7.83 (d, J = 8.6 Hz, 1H), 7.53 (d, J = 8.5 Hz, 1H), 1.51 (s, 9H)。 13C NMR (101 MHz, CDCl 3, ppm) δ 182.5, 152.2, 136.7, 129.2, 124.0, 123.8, 118.0, 38.4, 30.7。
本发明在可见光照射下，以N-(2-溴苯基)烷基硫代酰胺衍生物等N-(2-溴苯基)烷基硫代酰胺为原料，以磷酸钠作为碱，顺利地合成了一系列2-取代的烷基苯并噻唑衍生物。本发明所述反应具有广泛的底物适用范围，可以较高收率获得所需烷基苯并噻唑衍生物。本发明的整个反应过程绿色、高效且易于操作，是一种合成烷基苯并噻唑衍生物的好方法。

Claims (10)

  1. 可见光促进的N-(2-溴苯基)烷基硫代酰胺制备烷基苯并噻唑衍生物的方法，其特征在于，包括以下步骤，在可见光照射下，在碱存在下，以N-(2-溴苯基)烷基硫代酰胺为原料反应制备烷基苯并噻唑衍生物；所述N-(2-溴苯基)烷基硫代酰胺具有如下结构通式：
    Figure 615017dest_path_image001
    其中：R 8选自甲基、正丙基或者叔丁基；R 9选自氟、氯、溴或者甲基。
  2. 根据权利要求1所述的方法，其特征在于：所述惰性气体选自氮气、氦气、氖气、氩气中的任意一种。
  3. 根据权利要求1所述的方法，其特征在于：N-(2-溴苯基)烷基硫代酰胺、碱的摩尔比为1:（0.4～0.6）。
  4. 根据权利要求1所述的方法，其特征在于：所述碱为无机碱。
  5. 根据权利要求1所述的方法，其特征在于，所述反应为在室温下反应20～30小时。
  6. 根据权利要求1所述的方法，其特征在于，溶剂为二甲亚砜、DMF、THF、甲醇、乙醇、乙腈中的一种或者几种。
  7. 碱在以N-(2-溴苯基)烷基硫代酰胺为原料反应制备烷基苯并噻唑衍生物中的应用；所述N-(2-溴苯基)烷基硫代酰胺具有如下结构通式：
    Figure 266578dest_path_image001
    其中：R 8选自甲基、正丙基或者叔丁基；R 9选自氟、氯、溴或者甲基。
  8. 根据权利要求7所述的应用，其特征在于：所述反应在可见光下进行。
  9. 根据权利要求7所述的应用，其特征在于：所述反应为在室温下反应20～30小时。
  10. 根据权利要求1所述的方法制备的烷基苯并噻唑衍生物。
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