CN108863777B - Method for preparing oxalate - Google Patents
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Abstract
The invention discloses a method for preparing oxalate, which comprises the following steps: taking diazo compound and alpha-Br ketone compound as reaction substrates and O2The oxalic ester is obtained by taking visible light as an energy source and organic dye as a photocatalyst in an organic solvent through a free radical process. The method used by the invention has the following characteristics: the reaction is more green, environment-friendly and economical, the substrate universality is wider, the later-stage functionalization is easier, the reaction condition is mild, the reaction can be carried out in the air, the dosage of the photocatalyst is less, and the post-treatment is simple and convenient. Meanwhile, the raw materials such as reactants, photocatalyst and the like used in the method are cheap and easy to obtain, the reaction composition is reasonable, no ligand is needed, the atom economy is high, the reaction steps are few, higher yield can be obtained by only one-step reaction, the method meets the requirements and directions of modern green chemistry and sustainable development, and the method is suitable for synthesizing the asymmetric substituted oxalate which is difficult to synthesize by the traditional method.
Description
Technical Field
The invention relates to a method for preparing oxalate, belonging to the technical field of organic synthesis.
Background
Oxalate is widely present in natural products and drug molecules, and is a common structural unit in organic synthesis. There are many methods for preparing oxalate esters, but each method has some disadvantages. For example:
(1) the traditional reaction of oxalyl chloride or oxalyl monochloride and alcohol or ether requires alkali catalysis, wherein the oxalyl chloride is sensitive to air, is not damp and has high toxicity and corrosivity, the synthesized oxalate can only be symmetrically substituted oxalate, if the oxalyl monochloride is used as a raw material, the oxalyl monochloride needs to be prepared firstly, and the step is difficult to control, so that the synthesis is troublesome;
(2) carrying out ester exchange by using oxalate to synthesize new oxalate;
(3) transition metal catalyzed CO and CH3The oxidative coupling reaction of OH can only be used for synthesizing dimethyl oxalate, and an oxidant is required to be added in the reaction.
(4) Of course, the ozonization of olefin is also a method for synthesizing oxalate, but some olefins with special structures (such as ascorbic acid and its derivatives) are needed to synthesize oxalate.
In conclusion, no green method for synthesizing oxalate exists at present. Therefore, it is necessary to develop a preparation method with abundant raw material sources, low cost, safety, environmental protection and simple operation to effectively synthesize oxalate compounds.
Disclosure of Invention
The invention aims to provide a method for synthesizing oxalate, which has rich sources of reaction raw materials, wide universality of reaction substrates and simple and convenient operation, and takes visible light as an energy source of reaction and oxygen as an oxygen source and an oxidant, so that the method is very safe, environment-friendly and green.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
a method for preparing oxalate takes diazo compound and alpha-Br ketone compound as reaction substrates, and obtains oxalate through illumination reaction in organic solvent in the presence of photocatalyst and oxidant;
the chemical structural general formula of the alpha-Br ketone compound is one of the following chemical structural formulas:
in the formula, R1Is fluorine or methylOxy, methyl, chloro, trifluoromethyl, bromo, hydroxy; r2Selected from hydrogen or phenyl;
the structural formula of the diazo compound is as follows:
the diazo compound and the alpha-Br ketone compound are used as raw materials in the preparation of oxalate; preferably, the diazo compound and the alpha-Br ketone compound are used as raw materials, and the oxalic ester is prepared by the light irradiation reaction in the presence of a photocatalyst and an oxidant in an organic solvent.
The invention takes diazo compound and alpha-Br ketone compound as reaction substrates and O2The oxalic ester is obtained by taking visible light as an energy source of reaction, taking organic dye or metal complex as a photocatalyst and carrying out a free radical process in an organic solvent by taking an oxygen source and an oxidant.
In the chemical structural general formula of the alpha-Br ketone compound, R is1Can be ortho-substituted fluorine, methoxy, methyl, meta-substituted methoxy, methyl, chlorine, trifluoromethyl, or para-substituted fluorine, chlorine, bromine, methoxy, methyl, hydroxyl; or disubstituted 3, 4-dichloro, naphthyl; the photocatalyst is selected from common organic dyes (such as eosin Y, rhodamine-B, RhB) and the like), metal complexes (ruthenium (Ru (bpy) chloride) triple-hydrate, 3 Cl2.6H2O) and iridium (2-phenylpyridine) (RhO)fac-Ir(ppy)3) One of (1); the organic solvent is petroleum ether, N-methylpyrrolidone, dimethyl sulfoxide, N-dimethylformamide, acetonitrile, toluene, 1, 2-trichloroethane, etc.
In the invention, the chemical structural formula of the oxalate is one of the following:
wherein R is1、R2From alpha-Br ketones; r3From diazoA compound is provided.
In the technical scheme, the illumination reaction is carried out by using an LED green light lamp, the power is 7-15W, and the time is 12-48 hours; the power of the preferred LED green light lamp is 12W, and the time is 36 hours.
Preferably, the photocatalyst is eosin y (eosin y); the organic solvent is N, N-dimethylformamide.
In a preferred technical scheme, the dosage of the photocatalyst is 1% of the molar weight of the alpha-Br ketone compound, and the molar ratio of the diazo compound to the alpha-Br ketone compound is 4.
The reaction of the present invention is carried out in oxygen at room temperature. After the reaction is finished, extracting the reaction liquid by ethyl acetate, drying by anhydrous magnesium sulfate, removing the solvent, adsorbing by silica gel, and then carrying out column chromatography to obtain the product of oxalic ester.
The invention also discloses the oxalate prepared by the method.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
1. the method takes visible light as an energy source and oxygen as an oxygen source and an oxidant to realize the reaction of the alpha-Br ketone compound and the diazo compound to synthesize the oxalate, and compared with the prior art that the raw materials are prepared in advance or have high toxicity, the reaction takes heating as an energy source, and the reaction conditions are harsh, the method has the advantages of more economy, environmental protection, wider substrate universality, easily obtained raw materials and easier later-stage functionalization.
2. The method disclosed by the invention has the advantages of mild reaction conditions, room temperature implementation, small photocatalyst dosage and simple and convenient post-treatment.
3. The method has the advantages of cheap and easily-obtained raw materials such as reactants, photocatalyst and the like, reasonable reaction composition, no ligand, high atom economy, less reaction steps, and high yield by only one-step reaction, and meets the requirements and directions of modern green chemistry.
Detailed Description
The invention is further described below with reference to the following examples:
the alpha-Br ketone compound and the photocatalyst are marketized commodities and can be directly purchased, the alpha-Br ketone compound can also be synthesized by the marketized ketone compound and tetrabutyl tribromide, the diazo compound used in the invention is a marketized commodity and can be directly purchased, the diazo compound can also be reacted with bromoacetyl bromide through alcohol combination to generate corresponding bromide, and the bromide is reacted with TsNHNHNHTs to obtain the corresponding diazo compound.
Example one
To a 25mL Schlenk tube were added compound 1a (0.5 mmol, 101.6 mg), compound 2a (2 mmol, 224 vL), eosin Y (Eosin Y) (0.005 mol, 3.6 mg), and N, N-dimethylformamide (2 mL); then reacting for 36 hours in oxygen under the irradiation of a 12W green LED lamp; after the reaction, the product was extracted with ethyl acetate (10 mL × 3), dried over anhydrous magnesium sulfate, and the solvent was removed by a rotary evaporator, adsorbed on silica gel, and subjected to simple column chromatography to obtain the product 3a with a yield of 85%. The main test data of the prepared product are as follows, and the actual synthesized product is consistent with the theoretical analysis through analysis.
1H NMR (400 MHz, CDCl3) δ 7.94 – 7.89 (m, 2H), 7.63 (t, J=7.4 Hz, 1H), 7.50 (t, J=7.7 Hz, 2H), 5.55 (s, 2H), 4.40 (q, J=7.1 Hz, 2H), 1.40 (t, J=7.2 Hz, 3H); 13C NMR (101 MHz, CDCl3) δ 189.79, 156.91, 156.88, 134,10, 133.48, 128.84, 127.65, 67.59, 63.35, 13.75; HRMS (ESI-TOF): Anal. Calcd. For C12H12O5: 259.0577, Found: 259.0649 (M+Na+); IR (neat, cm-1): υ 2987, 2941, 1771, 1744, 1702, 1155, 960, 750, 688。
Example two
To a 25mL Schlenk tube were added compound 1b (0.5 mmol, 114.2 mg), compound 2a (2 mmol, 224 vL), eosin Y (Eosin Y) (0.005 mol, 3.6 mg), N, N-dimethylformamide (2 mL). The system was then reacted for 36 hours in oxygen under irradiation by a 12W green LED lamp. After the reaction, the reaction mixture was extracted with ethyl acetate (10 mL × 3), dried over anhydrous magnesium sulfate, and the solvent was removed by a rotary evaporator, adsorbed on silica gel, and subjected to simple column chromatography to obtain the product 3b in a yield of 73%. The main test data of the prepared product are as follows, and the actual synthesized product is consistent with the theoretical analysis through analysis.
1H NMR (400 MHz, CDCl3) δ 8.03-7.97 (m, 1H), 7.66-7.59 (m, 1H), 7.33 – 7.27 (m, 1H), 7.24-7.17 (m, 1H), 5.43 (d, J=3.7 Hz, 2H), 4.42 (q, J=7.1 Hz, 2H), 1.42 (t, J=7.2 Hz, 3H); 13C NMR (101 MHz, CDCl3) δ 188.00, 187.97, 163.65, 161.12, 157.04, 156.91, 136.10, 136.0, 130.83, 130.80, 125.02, 124.99, 121.84, 121.70, 116.68, 116.45, 70.60, 70.45, 63.44, 13.87; 19F NMR (376 MHz, CDCl3) δ -107.89; HRMS (ESI-TOF): Anal. Calcd. For C12H11FO5: 277.0483, Found: 277.0479 (M+Na+); IR (neat, cm-1): υ 3675, 2988, 2972, 2901, 1777, 1697, 1076, 1066, 780。
EXAMPLE III
To a 25mL Schlenk tube were added compound 1c (0.5 mmol, 119.5 mg), compound 2a (2 mmol, 224 vL), eosin Y (Eosin Y) (0.005 mol, 3.6 mg), N, N-dimethylformamide (2 mL). The system was then reacted for 36 hours in oxygen under irradiation by a 12W green LED lamp. After the reaction was completed, the reaction mixture was extracted with ethyl acetate (10 mL × 3), dried over anhydrous magnesium sulfate, and the solvent was removed by a rotary evaporator, adsorbed on silica gel, and subjected to simple column chromatography to obtain the product 3c with a yield of 90%. The main test data of the prepared product are as follows, and the actual synthesized product is consistent with the theoretical analysis through analysis.
1H NMR (400 MHz, CDCl3) δ 7.50-7.36 (m, 3H), 7.18-7.13 (m, 1H), 5.52 (s, 2H), 4.40 (q, J=7.1 Hz, 2H), 3.84 (s, 3H), 1.40 (s, 3H); 13C NMR (101 MHz, CDCl3) δ 189.64, 159.82, 156.88, 134.69, 129.82, 120.47, 119.98, 111.95, 67.63, 63.29, 55.27, 13.71; HRMS (ESI-TOF): Anal. Calcd. For C13H14O6: 289.0683, Found: 289.0675 (M+Na+); IR (neat, cm-1): υ 2943, 2840, 1771, 1745, 1701, 1153, 973, 782, 685。
Example four
To a 25mL Schlenk tube were added compound 1d (0.5 mmol, 122.9 mg), compound 2a (2 mmol, 224 vL), eosin Y (Eosin Y) (0.005 mol, 3.6 mg), N, N-dimethylformamide (2 mL). The system was then reacted for 36 hours in oxygen under irradiation by a 12W green LED lamp. After the reaction was completed, the reaction mixture was extracted with ethyl acetate (10 mL × 3), dried over anhydrous magnesium sulfate, and the solvent was removed by a rotary evaporator, adsorbed on silica gel, and subjected to simple column chromatography to obtain the product 3d with a yield of 80%. The main test data of the prepared product are as follows, and the actual synthesized product is consistent with the theoretical analysis through analysis.
1H NMR (400 MHz, CDCl3) δ 7.93 (t, J=1.7 Hz, 1H), 7.85-7.81 (m, 1H), 7.67-7.62 (m, 1H), 7.50 (t, J=7.9 Hz, 1H), 5.54 (s, 2H), 4.46 (q, J=7.1 Hz, 2H), 1.45 (t, J=7.2 Hz, 3H; 13C NMR (101 MHz, CDCl3) δ 188.81, 156.88, 156.85, 135.36, 135.07, 134.16, 130.33, 127.90, 125.83, 67.51, 63.57, 13.87; HRMS (ESI-TOF): Anal. Calcd. For C12H11ClO5: 293.0187, Found: 293.0175 (M+Na+); IR (neat, cm-1): υ 2986, 2941, 1772, 17745, 1177, 1156, 725, 680。
EXAMPLE five
To a 25mL Schlenk tube were added compound 1e (0.5 mmol, 112.1 mg), compound 2a (2 mmol, 224 vL), eosin Y (Eosin Y) (0.005 mol, 3.6 mg), N, N-dimethylformamide (2 mL). The system was then reacted for 36 hours in oxygen under irradiation by a 12W green LED lamp. After the reaction was completed, the reaction mixture was extracted with ethyl acetate (10 mL × 3), dried over anhydrous magnesium sulfate, and the solvent was removed by a rotary evaporator, adsorbed on silica gel, and subjected to simple column chromatography to obtain the product 3e with a yield of 81%. The main test data of the prepared product are as follows, and the actual synthesized product is consistent with the theoretical analysis through analysis.
1H NMR (400 MHz, CDCl3) δ 7.74 – 7.68 (m, 2H), 7.46-7.35 (m, 2H), 5.53 (s, 2H), 4.41 (q, J=7.1 Hz, 2H), 2.41 (s, 3H), 1.41 (t, J=7.2 Hz, 3H); 13C NMR (101 MHz, CDCl3) δ 189.88, 156.93, 156.91, 138.80, 134.89, 133.55, 128.72, 128.16, 124.85, 67.66, 63.37, 21.18, 13.80; HRMS (ESI-TOF): Anal. Calcd. For C13H14O5: 273.0733, Found: 273.0722 (M+Na+); IR (neat, cm-1): υ 2988, 2902, 1771, 1745, 1670, 1152, 972, 782, 689。
EXAMPLE six
To a 25mL Schlenk tube were added compound 1f (0.5 mmol, 140.6 mg), compound 2a (2 mmol, 224 vL), eosin Y (Eosin Y) (0.005 mol, 3.6 mg), N, N-dimethylformamide (2 mL). The system was then reacted for 36 hours in oxygen under irradiation by a 12W green LED lamp. After the reaction was completed, the reaction mixture was extracted with ethyl acetate (10 mL × 3), dried over anhydrous magnesium sulfate, and the solvent was removed by a rotary evaporator, adsorbed on silica gel, and subjected to simple column chromatography to obtain the product 3f in a yield of 69%. The main test data of the prepared product are as follows, and the actual synthesized product is consistent with the theoretical analysis through analysis.
1H NMR (400 MHz, CDCl3) δ 8.17 (s, 1H), 8.12 (d, J=7.6 Hz, 1H), 7.90 (d, J=7.5 Hz, 1H), 7.68 (t, J=7.7 Hz, 1H), 5.56 (s, 2H), 4.42 (dd, J = 14.1, 7.0 Hz, 2H), 1.42 (t, J=7.1 Hz, 3H); 13C NMR (101 MHz, CDCl3) δ 188.91, 156.89, 156.81, 134.13, 131.78, 131.45, 130.95, 130.58, 130.55, 129.73, 124.68, 124.64, 121.99, 67.54, 63.57, 13.82; 19F NMR (376 MHz, CDCl3) δ -62.96; HRMS (ESI-TOF): Anal. Calcd. For C13H11F3O5: 327.0451, Found: 327.0456 (M+Na+); IR (neat, cm-1): υ 2997, 2949, 1739, 1711, 1327, 1154, 1128, 1072, 812, 688。
EXAMPLE seven
To a 25mL Schlenk tube were added 1g (0.5 mmol, 114.3 mg) of compound 2a (2 mmol, 224 vL), eosin Y (Eosin Y) (0.005 mol, 3.6 mg), N, N-dimethylformamide (2 mL). The system was then reacted for 36 hours in oxygen under irradiation by a 12W green LED lamp. After the reaction, the reaction mixture was extracted with ethyl acetate (10 mL × 3), dried over anhydrous magnesium sulfate, and the solvent was removed by a rotary evaporator, adsorbed on silica gel, and subjected to simple column chromatography to obtain 3g of a product with a yield of 88%. The main test data of the prepared product are as follows, and the actual synthesized product is consistent with the theoretical analysis through analysis.
1H NMR (400 MHz, CDCl3) δ 8.03-8.97 (m, 1H), 7.66-7.58 (m, 1H), 7.34 – 7.26 (m, 1H), 7.24-7.16 (m, 1H), 5.43 (d, J=3.7 Hz, 2H), 4.42 (q, J=7.1 Hz, 2H), 1.42 (t, J=7.2 Hz, 3H); 13C NMR (101 MHz, CDCl3) δ 188.00, 187.95, 163.65, 161.12, 157.04, 156.91, 136.10, 136.01, 130.83, 130.80, 125.02, 124.99, 121.84, 121.70, 116.68, 116.45, 70.60, 70.45, 63.44, 13.87; 19F NMR (376 MHz, CDCl3) δ -107.89; HRMS (ESI-TOF): Anal. Calcd. For C12H11FO5: 277.0483, Found: 277.0480 (M+Na+); IR (neat, cm-1): υ 2994, 1747, 1695, 1594, 1160, 1104, 966, 836。
Example eight
To a 25mL Schlenk tube was added compound 1h (0.5 mmol, 122.9 mg), compound 2a (2 mmol, 224 vL), eosin Y (Eosin Y) (0.005 mol, 3.6 mg), N, N-dimethylformamide (2 mL). The system was then reacted for 36 hours in oxygen under irradiation by a 12W green LED lamp. After the reaction was completed, the reaction mixture was extracted with ethyl acetate (10 mL × 3), dried over anhydrous magnesium sulfate, and the solvent was removed by a rotary evaporator, adsorbed on silica gel, and subjected to simple column chromatography to obtain the product in 81% yield for 3 hours. The main test data of the prepared product are as follows, and the actual synthesized product is consistent with the theoretical analysis through analysis.
1H NMR (400 MHz, CDCl3) δ 7.87 (d, J=8.6 Hz, 2H), 7.49 (d, J=8.6 Hz, 2H), 5.50 (s, 2H), 4.42 (q, J=7.1 Hz, 2H), 1.41 (t, J=7.1 Hz, 3H); 13C NMR (101 MHz, CDCl3) δ 188.80, 156.91, 156.87, 140.74, 131.89, 129.31, 129.17, 67.45, 63.52, 13.85; HRMS (ESI-TOF): Anal. Calcd. For C12H11ClO5: 293.0187, Found: 293.0181 (M+Na+); IR (neat, cm-1): υ 2988, 2901, 1740, 1692, 1394, 1185, 1066, 1056。
Example nine
To a 25mL Schlenk tube were added compound 1i (0.5 mmol, 146.3 mg), compound 2a (2 mmol, 224 vL), eosin Y (Eosin Y) (0.005 mol, 3.6 mg), N, N-dimethylformamide (2 mL). The system was then reacted for 36 hours in oxygen under irradiation by a 12W green LED lamp. After the reaction was completed, the reaction mixture was extracted with ethyl acetate (10 mL × 3), dried over anhydrous magnesium sulfate, and the solvent was removed by a rotary evaporator, adsorbed on silica gel, and subjected to simple column chromatography to obtain the product 3i with a yield of 86%. The main test data of the prepared product are as follows, and the actual synthesized product is consistent with the theoretical analysis through analysis.
1H NMR (400 MHz, CDCl3) δ 7.78 (d, J=8.6 Hz, 2H), 7.65 (d, J=8.6 Hz, 2H), 5.49 (s, 2H), 4.42 (q, J=7.1 Hz, 2H), 1.41 (t, J=7.2 Hz, 3H); 13C NMR (101 MHz, CDCl3) δ 188.99, 156.89, 156.85, 132.30, 129.49, 129.21, 67.42, 63.52, 13.86; HRMS (ESI-TOF): Anal. Calcd. For C12H11BrO5: 336.9682, Found: 336.9671, 338.9658 (M+Na+); IR (neat, cm-1): υ 3011, 2993, 1736, 1691, 1585, 1179, 1165, 1070, 962, 761。
Example ten
To a 25mL Schlenk tube were added compound 1j (0.5 mmol, 120.6 mg), compound 2a (2 mmol, 224 vL), eosin Y (Eosin Y) (0.005 mol, 3.6 mg), N, N-dimethylformamide (2 mL). The system was then reacted for 36 hours in oxygen under irradiation by a 12W green LED lamp. After the reaction was completed, the reaction mixture was extracted with ethyl acetate (10 mL × 3), dried over anhydrous magnesium sulfate, and the solvent was removed by a rotary evaporator, adsorbed on silica gel, and subjected to simple column chromatography to obtain 3j, which was 81% in yield. The main test data of the prepared product are as follows, and the actual synthesized product is consistent with the theoretical analysis through analysis.
1H NMR (400 MHz, CDCl3) δ 7.89 (d, J = 8.9 Hz, 2H), 6.96 (d, J = 8.9 Hz, 2H), 5.50 (s, 2H), 4.41 (q, J = 7.1 Hz, 2H), 3.88 (s, 3H), 1.40 (t, J = 7.2 Hz, 3H); 13C NMR (101 MHz, CDCl3) δ 188.17, 164.19, 157.01, 156.97, 130.02, 126.51, 114.07, 67.37, 63.34, 55.45, 13.79; HRMS (ESI-TOF): Anal. Calcd. For C13H14O6: 289.0683, Found: 289.0690 (M+Na+); IR (neat, cm-1): υ 2986, 2944, 1766, 1742, 1687, 1600, 1159, 961, 843。
EXAMPLE eleven
To a 25mL Schlenk tube were added compound 1k (0.5 mmol, 113.2 mg), compound 2a (2 mmol, 224 vL), eosin Y (Eosin Y) (0.005 mol, 3.6 mg), N, N-dimethylformamide (2 mL). The system was then reacted for 36 hours in oxygen under irradiation by a 12W green LED lamp. After the reaction was completed, the reaction mixture was extracted with ethyl acetate (10 mL × 3), dried over anhydrous magnesium sulfate, and the solvent was removed by a rotary evaporator, adsorbed on silica gel, and subjected to simple column chromatography to obtain 3k, which was found to be 79%. The main test data of the prepared product are as follows, and the actual synthesized product is consistent with the theoretical analysis through analysis.
1H NMR (400 MHz, CDCl3) δ 7.72 (d, J = 8.1 Hz, 2H), 6.83 (d, J = 8.5 Hz, 2H), 5.42 (s, 2H), 4.37 – 4.25 (m, 2H), 1.29 (t, J = 7.1 Hz, 3H); 13C NMR (101 MHz, CDCl3) δ 189.16, 162.00, 157.14, 157.12, 130.50, 125.88, 115.92, 67.48, 63.75, 13.78; HRMS (ESI-TOF): Anal. Calcd. For C12H12O6: 275.0526, Found: 275.0538 (M+Na+); IR (neat, cm-1): υ 3038, 2943, 1742, 1668, 1574, 1371, 1152, 965, 840。
Example twelve
To a 25mL Schlenk tube were added compound 1l (0.5 mmol, 112.2 mg), compound 2a (2 mmol, 224 vL), eosin Y (Eosin Y) (0.005 mol, 3.6 mg), N, N-dimethylformamide (2 mL). The system was then reacted for 36 hours in oxygen under irradiation by a 12W green LED lamp. After the reaction was completed, the reaction mixture was extracted with ethyl acetate (10 mL × 3), dried over anhydrous magnesium sulfate, and the solvent was removed by a rotary evaporator, adsorbed on silica gel, and subjected to simple column chromatography to obtain 3l of a product with a yield of 80%. The main test data of the prepared product are as follows, and the actual synthesized product is consistent with the theoretical analysis through analysis.
1H NMR (400 MHz, CDCl3) δ 7.81 (d, J = 8.1 Hz, 2H), 7.29 (d, J = 7.9 Hz, 2H), 5.52 (s, 2H), 4.41 (q, J = 7.1 Hz, 2H), 2.42 (s, 3H), 1.41 (t, J = 7.1 Hz, 3H); 13C NMR (101 MHz, CDCl3) δ 189.33, 157.00, 156.96, 145.21, 131.07, 129.55, 127.79, 67.56, 63.38, 21.65, 13.81; HRMS (ESI-TOF): Anal. Calcd. For C13H14O5: 273.0733, Found: 273.0734 (M+Na+); IR (neat, cm-1): υ 2994, 2939, 1773, 1743, 1698, 1173, 963, 813, 790。
EXAMPLE thirteen
To a 25mL Schlenk tube were added compound 1m (0.5 mmol, 141.0 mg), compound 2a (2 mmol, 224 vL), eosin Y (Eosin Y) (0.005 mol, 3.6 mg), N, N-dimethylformamide (2 mL). The system was then reacted for 36 hours in oxygen under irradiation by a 12W green LED lamp. After the reaction was completed, the reaction mixture was extracted with ethyl acetate (10 mL × 3), dried over anhydrous magnesium sulfate, and the solvent was removed by a rotary evaporator, adsorbed on silica gel, and subjected to simple column chromatography to obtain a product of 3m with a yield of 84%. The main test data of the prepared product are as follows, and the actual synthesized product is consistent with the theoretical analysis through analysis.
1H NMR (400 MHz, CDCl3) δ 8.00 (d, J = 1.9 Hz, 1H), 7.75 (dd, J = 8.4, 1.9 Hz, 1H), 7.60 (d, J = 8.4 Hz, 1H), 5.47 (s, 2H), 4.43 (q, J = 7.1 Hz, 2H), 1.42 (t, J = 7.1 Hz, 3H); 13C NMR (101 MHz, CDCl3) δ 188.04, 156.86, 156.79, 139.01, 133.87, 133.08, 131.16, 129.81, 126.75, 67.36, 63.63, 13.89; HRMS (ESI-TOF): Anal. Calcd. For C12H10Cl2O5: 326.9797, Found: 326.9796 (M+Na+); IR (neat, cm-1): υ 3005, 2946, 1744, 1698, 1188, 975, 853, 830, 672。
Example fourteen
To a 25mL Schlenk tube were added compound 1N (0.5 mmol, 131.1 mg), compound 2a (2 mmol, 224 vL), eosin Y (Eosin Y) (0.005 mol, 3.6 mg), N, N-dimethylformamide (2 mL). The system was then reacted for 36 hours in oxygen under irradiation by a 12W green LED lamp. After the reaction was completed, the reaction mixture was extracted with ethyl acetate (10 mL × 3), dried over anhydrous magnesium sulfate, and the solvent was removed by a rotary evaporator, adsorbed on silica gel, and subjected to simple column chromatography to obtain the product 3n with a yield of 88%. The main test data of the prepared product are as follows, and the actual synthesized product is consistent with the theoretical analysis through analysis.
1H NMR (400 MHz, CDCl3) δ 8.37 (s, 1H), 7.91 (d, J = 8.2 Hz, 2H), 7.89 – 7.82 (m, 2H), 7.60 (t, J = 7.2 Hz, 1H), 7.54 (t, J = 7.3 Hz, 1H), 5.65 (s, 2H), 4.40 (q, J = 7.1 Hz, 2H), 1.39 (t, J = 7.1 Hz, 3H); 13C NMR (101 MHz, CDCl3) δ 189.67, 156.97, 156.95, 135.79, 132.11, 130.77, 129.49, 129.43, 128.93, 128.78, 127.72, 127.00, 122.93, 67.68, 63.37, 13.7 ; HRMS (ESI-TOF): Anal. Calcd. For C16H14O5: 309.0733, Found: 309.0733 (M+Na+); IR (neat, cm-1): υ 3059, 2988, 2958, 1742, 1702, 1174, 819, 744.
Example fifteen
To a 25mL Schlenk tube were added compound 1o (0.5 mmol, 144.8 mg), compound 2a (2 mmol, 224 vL), eosin Y (Eosin Y) (0.005 mol, 3.6 mg), N, N-dimethylformamide (2 mL). The system was then reacted for 36 hours in oxygen under irradiation by a 12W green LED lamp. After the reaction was completed, the reaction mixture was extracted with ethyl acetate (10 mL × 3), dried over anhydrous magnesium sulfate, and the solvent was removed by a rotary evaporator, adsorbed on silica gel, and subjected to simple column chromatography to obtain 3o, which was found to be 71% in yield. The main test data of the prepared product are as follows, and the actual synthesized product is consistent with the theoretical analysis through analysis.
1H NMR (400 MHz, CDCl3) δ 7.95 – 7.90 (m, 2H), 7.52 – 7.47 (m, 3H), 7.40 – 7.33 (m, 5H), 6.96 (s, 1H), 4.34 (q, J = 7.1 Hz, 2H), 1.33 (t, J = 7.1 Hz, 3H); 13C NMR (101 MHz, CDCl3) δ 191.63, 157.07, 157.04,133.92, 133.66, 132.20, 129.69, 129.16, 128.69, 128.73, 128.60, 79.67, 63.24, 13.74; HRMS (ESI-TOF): Anal. Calcd. For C18H16O5: 335.0890, Found: 335.0891 (M+Na+); IR (neat, cm-1): υ 2991, 1759, 1695, 1200, 1182, 937, 761, 689。
Example sixteen
To a 25mL Schlenk tube were added compound 1a (0.5 mmol, 101.6 mg), compound 2b (2 mmol, 269.7 mg), eosin Y (Eosin Y) (0.005 mol, 3.6 mg), N, N-dimethylformamide (2 mL). The system was then reacted for 36 hours in oxygen under irradiation by a 12W green LED lamp. After the reaction, the product was extracted with ethyl acetate (10 mL × 3), dried over anhydrous magnesium sulfate, and the solvent was removed by a rotary evaporator, adsorbed on silica gel, and subjected to simple column chromatography to obtain the product 4a with a yield of 90%. The main test data of the prepared product are as follows, and the actual synthesized product is consistent with the theoretical analysis through analysis.
1H NMR (400 MHz, CDCl3) δ 7.94-7.90(m, 2H), 7.66-7.61 (m, 1H), 7.54-7.48 (m, 2H), 5.53 (s, 2H), 5.23 (dt, J = 12.6, 6.3 Hz, 1H), 1.39 (d, J = 6.3 Hz, 6H); 13C NMR (101 MHz, CDCl3) δ 189.85, 157.22, 156.58, 134.16, 133.64, 128.93, 127.75, 71.93, 67.57, 21.46; HRMS (ESI-TOF): Anal. Calcd. For C13H14O5: 273.0733, Found: 273.0735 (M+Na+); IR (neat, cm-1): υ 2986, 2940, 1769, 1739, 1702, 1175, 963, 752, 689。
Example seventeen
To a 25mL Schlenk tube were added compound 1a (0.5 mmol, 101.6 mg), compound 2c (2 mmol, 299.2 mg), eosin Y (Eosin Y) (0.005 mol, 3.6 mg), N, N-dimethylformamide (2 mL). The system was then reacted for 36 hours in oxygen under irradiation by a 12W green LED lamp. After the reaction was completed, the reaction mixture was extracted with ethyl acetate (10 mL × 3), dried over anhydrous magnesium sulfate, and the solvent was removed by a rotary evaporator, adsorbed on silica gel, and subjected to simple column chromatography to obtain the product 4b in 85% yield. The main test data of the prepared product are as follows, and the actual synthesized product is consistent with the theoretical analysis through analysis.
1H NMR (400 MHz, CDCl3) δ 7.94-7.90(m, 2H), 7.64-7.60 (m, 1H), 7.54-7.48 (m, 2H), 5.50 (s, 2H), 1.59 (s, 9H); 13C NMR (101 MHz, CDCl3) δ 190.04, 157.70, 156.08, 134.13, 133.75, 128.93, 127.77, 85.35, 67.42, 27.71; HRMS (ESI-TOF): Anal. Calcd. For C14H16O5: 287.0890, Found: 287.0885 (M+Na+); IR (neat, cm-1): υ 2983, 2938, 1736, 1703, 1141, 962, 840, 755, 688。
EXAMPLE eighteen
To a 25mL Schlenk tube were added compound 1a (0.5 mmol, 101.6 mg), compound 2d (2 mmol, 290.7 mg), eosin Y (Eosin Y) (0.005 mol, 3.6 mg), N, N-dimethylformamide (2 mL). The system was then reacted for 36 hours in oxygen under irradiation by a 12W green LED lamp. After the reaction was completed, the reaction mixture was extracted with ethyl acetate (10 mL × 3), dried over anhydrous magnesium sulfate, and the solvent was removed by a rotary evaporator, adsorbed on silica gel, and subjected to simple column chromatography to obtain 4c in a yield of 81%. The main test data of the prepared product are as follows, and the actual synthesized product is consistent with the theoretical analysis through analysis.
1H NMR (400 MHz, CDCl3) δ 7.94 – 7.90 (m, 2H), 7.67-7.61 (m, 1H), 7.54-7.48 (m, 2H), 5.56 (s, 2H), 4.89 (q, J = 2.3 Hz, 2H), 1.87 (t, J = 2.4 Hz, 3H); 13C NMR (101 MHz, CDCl3) δ 189.69, 156.35, 156.30, 134.22, 133.52, 128.93, 127.74, 85.10, 71.41, 67.79, 55.40, 3.61; HRMS (ESI-TOF): Anal. Calcd. For C14H12O5: 283.0577, Found: 283.0580 (M+Na+); IR (neat, cm-1): υ 2955, 2921, 2244, 1747, 1697, 1166, 931, 761, 689
Example nineteen
To a 25mL Schlenk tube were added compound 1a (0.5 mmol, 101.6 mg), compound 2e (2 mmol, 295.0 mg), eosin Y (Eosin Y) (0.005 mol, 3.6 mg), N, N-dimethylformamide (2 mL). The system was then reacted for 36 hours in oxygen under irradiation by a 12W green LED lamp. After the reaction was completed, the reaction mixture was extracted with ethyl acetate (10 mL × 3), dried over anhydrous magnesium sulfate, and the solvent was removed by a rotary evaporator, adsorbed on silica gel, and subjected to simple column chromatography to obtain 4d, which was obtained in 80% yield. The main test data of the prepared product are as follows, and the actual synthesized product is consistent with the theoretical analysis through analysis.
1H NMR (400 MHz, CDCl3) δ 7.93–7.89 (m, 2H), 7.65–7.59 (m, 1H), 7.53-7.46 (m, 2H), 5.97–5.85(m, 1H), 5.71-5.61 (m, 1H), 5.54 (s, 2H), 4.78-4.73 (m, 2H), 1.77–1.71 (m, 3H); 13C NMR (101 MHz, CDCl3) δ 189.74, 156.88, 156.76, 134.17, 133.89, 133.58, 128.92, 127.73, 123.29, 67.91, 67.65, 17.74; HRMS (ESI-TOF): Anal. Calcd. For C14H14O5: 285.0733, Found: 285.0753 (M+Na+); IR (neat, cm-1): υ 2946, 1772, 1745, 1702, 1158, 964, 750, 688。
Example twenty
To a 25mL Schlenk tube were added compound 1a (0.5 mmol, 101.6 mg), compound 2f (2 mmol, 425.7 mg), eosin Y (Eosin Y) (0.005 mol, 3.6 mg), N, N-dimethylformamide (2 mL). The system was then reacted for 36 hours in oxygen under irradiation by a 12W green LED lamp. After the reaction was completed, the reaction mixture was extracted with ethyl acetate (10 mL × 3), dried over anhydrous magnesium sulfate, and the solvent was removed by a rotary evaporator, adsorbed on silica gel, and subjected to simple column chromatography to obtain 4e in a yield of 72%. The main test data of the prepared product are as follows, and the actual synthesized product is consistent with the theoretical analysis through analysis.
1H NMR (400 MHz, CDCl3) δ 7.92 – 7.87 (m, 2H), 7.61 (t, J = 7.4 Hz, 1H), 7.48 (t, J = 7.7 Hz, 2H), 7.42 – 7.37 (m, 2H), 7.36-7.24 (m, 4H), 6.75 (d, J = 15.8 Hz, 1H), 6.38-6.29 (m, 1H), 5.53 (s, 2H), 4.98 (dd, J = 6.7, 0.7 Hz, 2H); 13C NMR (101 MHz, CDCl3) δ 189.76, 156.78, 156.78, 136.27, 135.63, 134.19, 133.52, 128.91, 128.56, 128.37, 127.73, 126.73, 120.96, 67.78, 67.71; HRMS (ESI-TOF): Anal. Calcd. For C19H16O5: 347.0890, Found: 347.0886 (M+Na+); IR (neat, cm-1): υ 3064, 2959, 2921, 1764, 1739, 1695, 1159, 912, 747, 687。
Example twenty one
To a 25mL Schlenk tube were added compound 1a (0.5 mmol, 101.6 mg), compound 2g (2 mmol, 341.3 mg), eosin Y (Eosin Y) (0.005 mol, 3.6 mg), N, N-dimethylformamide (2 mL). The system was then reacted for 36 hours in oxygen under irradiation by a 12W green LED lamp. After the reaction was completed, the reaction mixture was extracted with ethyl acetate (10 mL × 3), dried over anhydrous magnesium sulfate, and the solvent was removed by a rotary evaporator, adsorbed on silica gel, and subjected to simple column chromatography to obtain 4f in a yield of 53%. The main test data of the prepared product are as follows, and the actual synthesized product is consistent with the theoretical analysis through analysis.
1H NMR (400 MHz, CDCl3) δ 7.97-7.91 (m, 2H), 7.65 (t, J = 7.4 Hz, 1H), 7.52 (t, J = 7.7 Hz, 2H), 7.43 (t, J = 7.9 Hz, 2H), 7.30 (t, J = 7.4 Hz, 1H), 7.27 – 7.22 (m, 2H), 5.62 (s, 2H); 13C NMR (101 MHz, CDCl3) δ 189.61), 156.55, 155.30, 149.92, 134.31, 133.56, 129.67, 129.01, 127.80, 126.81, 120.91, 68.00; HRMS (ESI-TOF): Anal. Calcd. For C16H12O5: 307.0577, Found: 307.0576 (M+Na+); IR (neat, cm-1): υ 2950, 1758, 1701, 1189, 1161, 964, 752, 743, 686。
Example twenty two
To a 25mL Schlenk tube were added compound 1a (0.5 mmol, 101.6 mg), compound 2h (2 mmol, 413.1 mg), eosin Y (Eosin Y) (0.005 mol, 3.6 mg), N, N-dimethylformamide (2 mL). The system was then reacted for 36 hours in oxygen under irradiation by a 12W green LED lamp. After the reaction was completed, the reaction mixture was extracted with ethyl acetate (10 mL × 3), dried over anhydrous magnesium sulfate, and the solvent was removed by a rotary evaporator, and the product was adsorbed on silica gel, and then subjected to simple column chromatography to obtain 4g of a product with a yield of 87%. The main test data of the prepared product are as follows, and the actual synthesized product is consistent with the theoretical analysis through analysis.
1H NMR (400 MHz, CDCl3) δ 7.94 – 7.89 (m, 2H), 7.63 (t, J = 7.4 Hz, 1H), 7.50 (t, J = 7.7 Hz, 2H), 7.18 (dd, J = 5.1, 1.0 Hz, 1H), 6.97-6.91 (m, 2H), 5.54 (s, 2H), 4.54 (t, J = 7.0 Hz, 2H), 3.29 (t, J = 7.0 Hz, 2H); 13C NMR (101 MHz, CDCl3) δ 189.68, 156.77, 156.68, 138.39, 134.21, 133.60, 128.95, 127.76, 127.04, 125.99, 124.31, 67.72, 67.17, 28.79; HRMS (ESI-TOF): Anal. Calcd. For C16H14O5S: 341.0454, Found: 341.0457 (M+Na+); IR (neat, cm-1): υ 2960, 2923, 1770, 1744, 1702, 1168, 959, 753, 688。
Claims (2)
1. A method for preparing oxalate, which is characterized in that: taking a diazo compound and an alpha-Br ketone compound as reaction substrates, and carrying out a light reaction in N, N-dimethylformamide in the presence of eosin Y and oxygen to obtain oxalate;
the chemical structural general formula of the alpha-Br ketone compound is one of the following chemical structural formulas:
in the formula, R1Fluorine, methoxy, methyl, chlorine, trifluoromethyl, bromine and hydroxyl; r2Selected from hydrogen or phenyl;
the structural formula of the diazo compound is as follows:
the power of the light reaction is 12W, and the time is 36 hours.
2. The method according to claim 1, wherein: the dosage of the eosin Y is 1 percent of the molar weight of the alpha-Br ketone compound, and the molar ratio of the diazo compound to the alpha-Br ketone compound is 4.
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