CN113845530A - Convenient Michal addition reaction of 2-phenylbenzimidazole [2,1-b ] thiazole - Google Patents
Convenient Michal addition reaction of 2-phenylbenzimidazole [2,1-b ] thiazole Download PDFInfo
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- CN113845530A CN113845530A CN202111046554.1A CN202111046554A CN113845530A CN 113845530 A CN113845530 A CN 113845530A CN 202111046554 A CN202111046554 A CN 202111046554A CN 113845530 A CN113845530 A CN 113845530A
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- thiazole
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- phenylbenzimidazole
- michal
- addition reaction
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- FZWLAAWBMGSTSO-UHFFFAOYSA-N Thiazole Chemical compound C1=CSC=N1 FZWLAAWBMGSTSO-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 238000007259 addition reaction Methods 0.000 title claims abstract description 19
- DWYHDSLIWMUSOO-UHFFFAOYSA-N 2-phenyl-1h-benzimidazole Chemical compound C1=CC=CC=C1C1=NC2=CC=CC=C2N1 DWYHDSLIWMUSOO-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
- 239000002904 solvent Substances 0.000 claims abstract description 10
- 239000000047 product Substances 0.000 claims abstract description 9
- 238000004440 column chromatography Methods 0.000 claims abstract description 6
- 239000002841 Lewis acid Substances 0.000 claims abstract description 5
- 150000007517 lewis acids Chemical class 0.000 claims abstract description 5
- 239000012043 crude product Substances 0.000 claims abstract description 4
- JLIDVCMBCGBIEY-UHFFFAOYSA-N 1-penten-3-one Chemical compound CCC(=O)C=C JLIDVCMBCGBIEY-UHFFFAOYSA-N 0.000 claims description 6
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 claims description 6
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 6
- 150000001879 copper Chemical class 0.000 claims description 6
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical group CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims description 6
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 4
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims description 4
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 4
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical group [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 claims description 2
- 239000005751 Copper oxide Substances 0.000 claims description 2
- 229910000431 copper oxide Inorganic materials 0.000 claims description 2
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 claims description 2
- SBTSVTLGWRLWOD-UHFFFAOYSA-L copper(ii) triflate Chemical compound [Cu+2].[O-]S(=O)(=O)C(F)(F)F.[O-]S(=O)(=O)C(F)(F)F SBTSVTLGWRLWOD-UHFFFAOYSA-L 0.000 claims description 2
- JIDMEYQIXXJQCC-UHFFFAOYSA-L copper;2,2,2-trifluoroacetate Chemical compound [Cu+2].[O-]C(=O)C(F)(F)F.[O-]C(=O)C(F)(F)F JIDMEYQIXXJQCC-UHFFFAOYSA-L 0.000 claims description 2
- ZWAJLVLEBYIOTI-UHFFFAOYSA-N cyclohexene oxide Chemical compound C1CCCC2OC21 ZWAJLVLEBYIOTI-UHFFFAOYSA-N 0.000 claims description 2
- FWFSEYBSWVRWGL-UHFFFAOYSA-N cyclohexene oxide Natural products O=C1CCCC=C1 FWFSEYBSWVRWGL-UHFFFAOYSA-N 0.000 claims description 2
- 239000011521 glass Substances 0.000 claims description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 2
- YWVBJFMMIJSRPI-UHFFFAOYSA-N 2-phenyl-[1,3]thiazolo[3,2-a]benzimidazole Chemical compound S1C2=NC3=CC=CC=C3N2C=C1C1=CC=CC=C1 YWVBJFMMIJSRPI-UHFFFAOYSA-N 0.000 claims 5
- 239000000203 mixture Substances 0.000 claims 1
- HYZJCKYKOHLVJF-UHFFFAOYSA-N 1H-benzimidazole Chemical compound C1=CC=C2NC=NC2=C1 HYZJCKYKOHLVJF-UHFFFAOYSA-N 0.000 abstract description 6
- 239000002994 raw material Substances 0.000 abstract description 5
- 239000012295 chemical reaction liquid Substances 0.000 abstract description 4
- 125000000524 functional group Chemical group 0.000 abstract description 4
- 238000001816 cooling Methods 0.000 abstract description 3
- 238000001914 filtration Methods 0.000 abstract description 3
- 238000003756 stirring Methods 0.000 abstract description 3
- 238000001704 evaporation Methods 0.000 abstract description 2
- 125000000623 heterocyclic group Chemical group 0.000 abstract description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract 1
- 230000008020 evaporation Effects 0.000 abstract 1
- 229910052717 sulfur Inorganic materials 0.000 abstract 1
- 239000011593 sulfur Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 8
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 6
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- HEDRZPFGACZZDS-MICDWDOJSA-N Trichloro(2H)methane Chemical compound [2H]C(Cl)(Cl)Cl HEDRZPFGACZZDS-MICDWDOJSA-N 0.000 description 4
- 238000003786 synthesis reaction Methods 0.000 description 4
- -1 thiazole compound Chemical class 0.000 description 3
- 150000003557 thiazoles Chemical class 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 229940079593 drug Drugs 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000005160 1H NMR spectroscopy Methods 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 150000001556 benzimidazoles Chemical class 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003480 eluent Substances 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 238000004983 proton decoupled 13C NMR spectroscopy Methods 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 238000004809 thin layer chromatography Methods 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D513/00—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for in groups C07D463/00, C07D477/00 or C07D499/00 - C07D507/00
- C07D513/02—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for in groups C07D463/00, C07D477/00 or C07D499/00 - C07D507/00 in which the condensed system contains two hetero rings
- C07D513/04—Ortho-condensed systems
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
Abstract
The invention relates to a convenient Michal addition reaction of 2-phenylbenzimidazole [2,1-b ] thiazole. Adding 2-phenylbenzimidazole [2,1-b ] thiazole, 1-pentene-3-ketone, Lewis acid and a solvent into a reaction vessel, stirring and reacting for 1-10 hours at 40-150 ℃, cooling to room temperature after the reaction is finished, filtering reaction liquid, removing the solvent through reduced pressure evaporation to obtain a crude product, and purifying by column chromatography to obtain the Michal addition product. The invention relates to a convenient Michal addition reaction of 2-phenylbenzimidazole [2,1-b ] thiazole, which has the characteristics of convenient operation, mild condition, easily obtained raw materials, good functional group tolerance and the like, and has important research value for the Michal addition reaction of sulfur-containing heterocycles such as benzimidazole [2,1-b ] thiazole.
Description
Technical Field
The invention relates to the technical fields of medicinal chemistry, life science, organic synthesis and the like, in particular to a convenient Michal addition reaction of 2-phenylbenzimidazole [2,1-b ] thiazole.
Background
Benzimidazole [2,1-b ] thiazole compounds occupy an important research position in the fields of medicinal chemistry and life science due to unique heterocyclic structures. Many drug molecules and drug molecule precursors contain this parent core structure. Therefore, the research on the functional group reaction of the benzimidazole [2,1-b ] thiazole compound has been a hot research in the field of organic synthesis. At present, no relevant reports exist on the Michal addition reaction by using benzimidazole [2,1-b ] thiazole compounds as reaction raw materials and using cheap and easily available Lewis acid as a catalyst. The method provides a simple and feasible synthetic path for the construction of alkyl substituted benzimidazole [2,1-b ] thiazole compounds and derivatives thereof.
Disclosure of Invention
The invention provides a convenient Michal addition reaction of 2-phenylbenzimidazole [2,1-b ] thiazole, the method is convenient to operate, mild in condition, easy to obtain raw materials and good in functional group tolerance, and a high-efficiency and convenient synthesis means is provided for the Michal addition reaction of the benzimidazole [2,1-b ] thiazole compound. The synthetic route is as follows:
the principle of the invention is that 2-phenyl benzimidazole [2,1-b ] thiazole and 1-amylene-3-ketone are taken as reaction raw materials, and copper salt is taken as a catalyst to carry out Michal addition reaction.
The purpose of the invention is realized by the following technical scheme:
a convenient Michal addition reaction of 2-phenylbenzimidazole [2,1-b ] thiazole: adding 2-phenylbenzimidazole [2,1-b ] thiazole, 1-pentene-3-ketone, Lewis acid and a solvent into a reaction vessel, stirring and reacting for 1-10 hours at 40-150 ℃, cooling to room temperature after the reaction is finished, filtering reaction liquid, evaporating the solvent under reduced pressure to obtain a crude product, and purifying by column chromatography to obtain the Michal addition product;
the above reaction is represented by the following formula:
in the above method, the reaction vessel is a glass test tube; the copper salt is copper oxide, copper chloride, copper trifluoroacetate and copper trifluoromethanesulfonate.
In the method, the molar ratio of the added 2-phenylbenzimidazole [2,1-b ] thiazole to the 1-penten-3-one is 1 (0.05-5).
In the method, the molar ratio of the added copper salt to the 2-phenylbenzimidazole [2,1-b ] thiazole is (0.05-5): 1.
In the method, the solvent is n-hexane, toluene, dichloromethane, acetonitrile, n-butanol, ethanol, tetrahydrofuran, acetone, cyclohexene oxide and dimethyl sulfoxide.
In the method, the reaction temperature is 40-150 ℃.
In the method, after the reaction is finished, the product is separated and purified by column chromatography; the column chromatography eluent is a mixed solvent of petroleum ether and ethyl acetate, and the ratio range of the petroleum ether to the ethyl acetate is 1-40: 1.
Compared with the prior art, the invention has the following advantages and effects:
the convenient Michal addition reaction of the 2-phenylbenzimidazole [2,1-b ] thiazole is convenient to operate, mild in condition, easy in obtaining of raw materials and good in functional group tolerance, and provides an efficient and convenient synthesis means for the Michal addition reaction of the benzimidazole [2,1-b ] thiazole compound.
Drawings
FIG. 1 is a hydrogen spectrum of the product obtained in example 1;
FIG. 2 is a carbon spectrum of the product obtained in example 1;
Detailed Description
Example 1
To a 25mL test tube were added 0.2 mmol of 2-phenylbenzimidazole [2,1-b ] thiazole, 0.26 mmol of 1-penten-3-one, and 0.4 mmol of acidic alumina, and 3 mL of n-hexane was added as a solvent, followed by stirring at 68 ℃. And (3) after TLC (thin layer chromatography) detection reaction is finished, cooling the reaction liquid to room temperature, filtering the reaction liquid, decompressing and rotary-steaming the filtrate to remove the solvent, and separating and purifying by column chromatography to obtain the target product with the yield of 21%.
The structural characterization data of the resulting product are shown below:
1H NMR(500MHz,CDCl3)δ7.77-7.60(m,4H),7.47(t,J＝7.7Hz,3H),7.36(td,J＝7.6,4.6Hz,2H),3.57(t,J＝7.3Hz,2H),2.91(t,J＝7.2Hz,2H),2.51(q,J＝7.3Hz,2H),1.12(t,J＝7.3Hz,3H)；
13C{1H}NMR(125MHz,CDCl3)δ209.6,146.8,133.2,130.6,128.7,127.7,127.4,127.4,126.4,126.4,124.6,124.6,123.5,112.7,112.7,41.5,36.3,19.2,7.8.
the structure of the resulting product is deduced from the above data as follows: (see FIGS. 1 and 2)
Claims (6)
1. A convenient Michal addition reaction of 2-phenylbenzimidazole [2,1-b ] thiazole is characterized in that 2-phenylbenzimidazole [2,1-b ] thiazole, 1-pentene-3-ketone, Lewis acid and a solvent are added into a reaction container, the mixture is stirred and reacted for 1-10 hours at the temperature of 40-150 ℃, the reaction solution is cooled to the room temperature after the reaction is finished, the reaction solution is filtered, the solvent is evaporated under reduced pressure to obtain a crude product, and the crude product is purified by column chromatography to obtain the Michal addition product; the Lewis acid is copper salt;
the above reaction is shown by the following formula.
2. A facile Michal addition reaction of 2-phenylbenzimidazo [2,1-b ] thiazole according to claim 1, characterized by: the reaction container is a glass test tube; the copper salt is copper oxide, copper chloride, copper trifluoroacetate and copper trifluoromethanesulfonate.
3. A facile Michal addition reaction of 2-phenylbenzimidazo [2,1-b ] thiazole according to claim 1, characterized by: the molar ratio of the added 2-phenylbenzimidazole [2,1-b ] thiazole to the 1-penten-3-one is 1 (0.05-5).
4. A facile Michal addition reaction of 2-phenylbenzimidazo [2,1-b ] thiazole according to claim 1, characterized by: the molar ratio of the added copper salt to the 2-phenylbenzimidazole [2,1-b ] thiazole is (0.05-5) to 1.
5. A facile Michal addition reaction of 2-phenylbenzimidazo [2,1-b ] thiazole according to claim 1, characterized by: the solvent is n-hexane, toluene, dichloromethane, acetonitrile, n-butanol, ethanol, tetrahydrofuran, acetone, cyclohexene oxide, and dimethyl sulfoxide.
6. A facile Michal addition reaction of 2-phenylbenzimidazo [2,1-b ] thiazole according to claim 1, characterized by: the reaction temperature is 40-150 ℃.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103172637A (en) * | 2013-03-13 | 2013-06-26 | 上海大学 | Pyrimido [1, 2-a] benzimidazole compound and method for preparing same |
| CN106866707A (en) * | 2017-04-14 | 2017-06-20 | 山西大学 | A kind of preparation method of benzimidazole simultaneously [2,1 b] thiazole |
| CN109467564A (en) * | 2018-12-27 | 2019-03-15 | 温州大学 | A method of synthesizing 2- substituted thiazole simultaneously [3,2-a] benzimidazoles compound |
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2021
- 2021-09-08 CN CN202111046554.1A patent/CN113845530A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103172637A (en) * | 2013-03-13 | 2013-06-26 | 上海大学 | Pyrimido [1, 2-a] benzimidazole compound and method for preparing same |
| CN106866707A (en) * | 2017-04-14 | 2017-06-20 | 山西大学 | A kind of preparation method of benzimidazole simultaneously [2,1 b] thiazole |
| CN109467564A (en) * | 2018-12-27 | 2019-03-15 | 温州大学 | A method of synthesizing 2- substituted thiazole simultaneously [3,2-a] benzimidazoles compound |
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