CN111233781B - Method for generating 2-hydroxyphenol oxazine-3-ketone compound by catalyzing oxidation of molecular oxygen in water phase - Google Patents

Method for generating 2-hydroxyphenol oxazine-3-ketone compound by catalyzing oxidation of molecular oxygen in water phase Download PDF

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CN111233781B
CN111233781B CN202010174955.4A CN202010174955A CN111233781B CN 111233781 B CN111233781 B CN 111233781B CN 202010174955 A CN202010174955 A CN 202010174955A CN 111233781 B CN111233781 B CN 111233781B
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杨贯羽
段文雪
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Kanglong Beijing New Drug Technology Ltd By Share Ltd
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    • C07D265/281,4-Oxazines; Hydrogenated 1,4-oxazines
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Abstract

The invention provides a method for generating 2-hydroxyphenol oxazine-3-ketone compounds by catalyzing molecular oxygen oxidation in an aqueous phase, which takes gallic acid as a catalyst and metal salt as a cocatalyst, and leads an o-aminophenol compound and a catechol compound to react in the aqueous phase in the presence of alkali in an oxygen or air environment to generate the 2-hydroxyphenol oxazine-3-ketone compounds. The reaction is carried out in a water phase, and other organic solvents are not required to be added; the catalyst is simple, the catalytic activity is high, and the reaction efficiency is high; simple synthesis process, less waste, environment friendliness and stronger industrial application prospect.

Description

Method for generating 2-hydroxyphenol oxazine-3-ketone compound by catalyzing oxidation of molecular oxygen in water phase
Technical Field
The invention relates to the technical field of synthesis of organic heterocyclic compounds, in particular to a method for generating 2-hydroxyphenol oxazine-3-ketone compounds by catalyzing oxidation of molecular oxygen in a water phase.
Background
The phenoxazinone alkaloids are widely distributed in nature and are considered as a unique natural tricyclic heterocyclic compound. The research finds that the phenol oxazinone compounds have wide drug properties, including anti-tumor, anti-virus, anti-inflammatory, antibacterial, anti-Alzheimer disease and the like. Therefore, the pharmaceutical chemistry research often uses phenoxazinones as the parent core structure of new drugs. Among them, 2-hydroxyphenol oxazine-3-one compounds are attracting much attention.
The synthesis of 2-hydroxyphenol oxazine-3-ketone compounds reported in the literature is not many. C.W. Bird et al used 2-nitro diphenyl ether compound as raw material, and synthesized 2-hydroxyphenol oxazine-3-ketone compound by reduction cyclization and demethylation reaction [ Tetrahedron, 36(4), 529-33; 1980 ]. The method has multiple reaction steps and low application value.
The method for generating the 2-hydroxyphenol oxazine-3-ketone compound by the oxidative condensation cyclization reaction of the o-aminophenol compound and the o-dihydroxybenzene compound is the simplest and most efficient (see formula 1), but the literature reports that one example of the synthetic method is found. H.W. Wanzlick et al report that 6-acetyl ortho aminophenol and catechol in acetic acid can be extracted from K3Fe(CN)6Oxidation to 9-acetyl-2-hydroxyphenol oxazin-3-one [ Angewandte Chemie, 76(8), 313-20; 1964]. The method uses a metered oxidant, is carried out in an organic solvent, has complicated post-treatment and high cost, and is difficult to avoid the generation of salt-containing wastewater, thereby limiting the use of the methods.
Figure DEST_PATH_IMAGE001
Formula 1.
Disclosure of Invention
The invention provides a method for generating 2-hydroxyphenol oxazine-3-ketone compounds by oxidizing o-aminophenol compounds and oxidizing, condensing and cyclizing o-catechol compounds by using natural gallic acid and metal salt combined catalysis molecules in a water phase.
The technical scheme for realizing the invention is as follows:
a method for generating 2-hydroxyphenol oxazine-3-ketone compounds by catalyzing molecular oxygen oxidation in an aqueous phase comprises the steps of reacting an o-aminophenol compound and a catechol compound in the presence of alkali in the aqueous phase in an oxygen or air environment by using gallic acid as a catalyst and metal salt as a cocatalyst to generate the 2-hydroxyphenol oxazine-3-ketone compounds.
The metal of the promoter metal salt is any one of Cu, Fe, Co and Mn, and the acid radical ion is any one of acetate, carbonate, hydrochloride and sulfate. The metal salt may be one or any combination of two or more thereof.
The alkali is NaOH and Na2CO3、NaHCO3、KOH、K2CO3Or KHCO3Any one of them.
The o-aminophenol compound is o-aminophenol and substituted o-aminophenol.
The catechol compound is catechol or substituted catechol.
The mol ratio of the o-aminophenol compound to the o-catechol compound is 1: (0.9-1.2).
The dosage of the catalyst gallic acid is 0.01-10% of the quantity of the o-aminophenol compound, the dosage of the cocatalyst is 0.01-10% of the quantity of the o-aminophenol compound, the dosage of the water is 2-60 times of the quantity of the o-aminophenol compound, and the alkali is 0.05-1 equivalent of the o-aminophenol compound.
The reaction oxygen partial pressure is 0.1-1.0 MPa, the temperature is 10-60 ℃, and the reaction time is 2-50 hours.
The reaction oxygen partial pressure is 0.2-0.3 MPa, the temperature is 10-40 ℃, and the reaction time is 4-20 hours.
The method for synthesizing the 2-hydroxyphenol oxazine-3-ketone compound has the advantages that the reaction is carried out in a water phase, and other organic solvents are not required to be added.
In the invention, gallic acid is used as a catalyst, and metal salt is used as a cocatalyst, and the catalyst is directly put into use. The gallic acid and the metal salt of the cocatalyst used for the catalyst can be directly purchased into corresponding chemical products.
In the using process of the invention, the reaction effect is improved along with the increase of the using amount of the catalyst and the cocatalyst, but the production cost is increased along with the increase of the using amount of the catalyst, and the separation is difficult due to the excessive catalyst. The amount of the catalyst is 0.01 to 10%, preferably 0.03 to 2% by mass of the o-aminophenol compound. The amount of the cocatalyst is 0.01-5%, preferably 0.03-1% of the amount of the o-aminophenol compound.
The method is carried out in the water phase, the increase of the water consumption can reduce the viscosity of the reaction solution and improve the stirring effect, thereby improving the reaction effect, but the excessive water consumption can reduce the concentration of the catalytic system and reduce the reaction efficiency, and increase the energy consumption. The amount of water used is 2 to 60 times, preferably 10 to 40 times, the amount of the o-aminophenol compound.
After the synthesis reaction is finished, the post-treatment process is not particularly limited, and the product can be separated and purified by the following method: and after the oxidation reaction is finished, standing and cooling, extracting, distilling, and recrystallizing to obtain the product.
The invention has the beneficial effects that: the reaction is carried out in a water phase, and other organic solvents are not required to be added; the catalyst is simple, the catalytic activity is high, and the reaction efficiency is high; simple synthesis process, less waste, environment friendliness and stronger industrial application prospect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic representation of 2-hydroxyphenol oxazin-3-one prepared in example 11HNMR spectrogram;
FIG. 2 is a drawing of 2-hydroxyphenol oxazin-3-one prepared in example 113HNMR spectrogram;
FIG. 3 is a drawing showing the preparation of 1-methyl-2-hydroxyphenol oxazin-3-one prepared in example 21HNMR spectrogram;
FIG. 4 is a drawing of 1-methyl-2-hydroxyphenol oxazin-3-one prepared in example 213HNMR spectrogram.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
Synthesis of 2-hydroxyphenol oxazine-3-one:
in a 150 mL reaction vessel, 2.18 g of ortho-aminophenol, 1.88 g of catechol, 2.2 mg of gallic acid, 0.3 g of ferric sulfate, 0.25 g of copper carbonate, 80 mg of NaOH and 60 mL of water were put; heating to 40 ℃ under stirring, introducing oxygen, keeping the pressure in the reaction kettle at 0.3 MPa, stopping the reaction after 20 hours of reaction, cooling to room temperature, extracting with 3X 15 mL of ethyl acetate, combining ethyl acetate layers, removing ethyl acetate by rotary evaporation, recrystallizing the residual solid with isopropanol, filtering, drying to obtain 3.6 g of black solid, determining the product to be 2-hydroxyphenol oxazine-3-one by methods such as NMR (shown in the attached drawing) and MS, wherein the yield is 87%, and the purity of the product is 98% as analyzed by a liquid chromatograph.
Example 2
Synthesis of 1-methyl-2-hydroxyphenol oxazine-3-one:
into a 150 mL reaction vessel were charged 1.23 g of 2-aminophenol, 0.94 g of 3-methylcatechol, 123 mg of gallic acid, 2.4 mg of cobalt chloride, 9.9 mg of manganese acetate, 1.38 g K2CO3And 55 mL of water; keeping the temperature at 15 ℃ while stirring, pressing air in, keeping the pressure in the reaction kettle at 0.1 MPa, stopping the reaction after 2 hours of reaction, cooling to room temperature, extracting with 3X 15 mL ethyl acetate, combining ethyl acetate layers, removing ethyl acetate by rotary evaporation, recrystallizing the residual solid with isopropanol, filtering, drying to obtain 2.0 g of black solid, determining the product to be 7-methyl-2-hydroxyphenol oxazine-3-one by the methods of NMR (shown in the attached drawing), MS and the like, wherein the yield is 92%, and the purity of the product analyzed by a liquid chromatograph is 97%.
Other 2-hydroxyphenol oxazin-3-one compounds were synthesized in the same manner as in example 1, and their various reaction conditions and reaction results are shown in Table 1.
TABLE 1 Synthesis of various 2-hydroxyphenol oxazine-3-ones under different conditions
Figure DEST_PATH_IMAGE002
Figure DEST_PATH_IMAGE003
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (9)

1. A method for generating 2-hydroxyphenol oxazine-3-ketone compounds by catalyzing oxidation of molecular oxygen in an aqueous phase is characterized by comprising the following steps: reacting an o-aminophenol compound and an o-catechol compound in an aqueous phase in the presence of alkali in an oxygen or air environment by using gallic acid as a catalyst and a metal salt as a cocatalyst to generate a 2-hydroxyphenol oxazine-3-ketone compound.
2. The method for catalyzing the oxidation of molecular oxygen to generate 2-hydroxyphenol oxazin-3-one compounds in aqueous phase according to claim 1, characterized in that: the metal of the promoter metal salt is any one of Cu, Fe, Co and Mn, and the acid radical ion is any one of acetate, carbonate, hydrochloride and sulfate.
3. The method for catalyzing the oxidation of molecular oxygen to generate 2-hydroxyphenol oxazin-3-one compounds in aqueous phase according to claim 1, characterized in that: the alkali is NaOH and Na2CO3、NaHCO3、KOH、K2CO3Or KHCO3Any one of them.
4. The method for catalyzing the oxidation of molecular oxygen to generate 2-hydroxyphenol oxazin-3-one compounds in aqueous phase according to claim 1, characterized in that: the o-aminophenol compound is o-aminophenol and substituted o-aminophenol.
5. The method for catalyzing the oxidation of molecular oxygen to generate 2-hydroxyphenol oxazin-3-one compounds in aqueous phase according to claim 1, characterized in that: the catechol compound is catechol or substituted catechol.
6. The method for catalyzing the oxidation of molecular oxygen to generate 2-hydroxyphenol oxazin-3-one compounds in aqueous phase according to claim 1, characterized in that: the mol ratio of the o-aminophenol compound to the o-catechol compound is 1: (0.9-1.2).
7. The method for catalyzing the oxidation of molecular oxygen to generate 2-hydroxyphenol oxazin-3-one compounds in aqueous phase according to claim 1, characterized in that: the dosage of the catalyst gallic acid is 0.01-10% of the quantity of the o-aminophenol compound, the dosage of the cocatalyst is 0.01-10% of the quantity of the o-aminophenol compound, the dosage of the water is 2-60 times of the quantity of the o-aminophenol compound, and the alkali is 0.05-1 equivalent of the o-aminophenol compound.
8. The method for catalyzing the oxidation of molecular oxygen to generate 2-hydroxyphenol oxazin-3-one compounds in aqueous phase according to claim 1, characterized in that: the reaction oxygen partial pressure is 0.1-1.0 MPa, the temperature is 10-60 ℃, and the reaction time is 2-50 hours.
9. The method for catalyzing the oxidation of molecular oxygen to generate 2-hydroxyphenol oxazin-3-one compounds in aqueous phase according to claim 8, characterized in that: the reaction oxygen partial pressure is 0.2-0.3 MPa, the temperature is 10-40 ℃, and the reaction time is 4-20 hours.
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