CN116606335A - Synthetic method of monohydroxy acetylated hesperidin - Google Patents

Synthetic method of monohydroxy acetylated hesperidin Download PDF

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CN116606335A
CN116606335A CN202310583070.3A CN202310583070A CN116606335A CN 116606335 A CN116606335 A CN 116606335A CN 202310583070 A CN202310583070 A CN 202310583070A CN 116606335 A CN116606335 A CN 116606335A
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hesperidin
acetylated
monohydroxy
drug
hydroxyl
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周钢
朱政
薛向东
李国印
宋泽文
魏迪
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Air Force Medical University of PLA
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    • C07HSUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
    • C07H17/00Compounds containing heterocyclic radicals directly attached to hetero atoms of saccharide radicals
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    • B01J31/2208Oxygen, e.g. acetylacetonates
    • B01J31/2217At least one oxygen and one nitrogen atom present as complexing atoms in an at least bidentate or bridging ligand
    • BPERFORMING OPERATIONS; TRANSPORTING
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    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J31/00Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/16Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
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    • C07HSUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
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    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01J2531/82Metals of the platinum group
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02P20/50Improvements relating to the production of bulk chemicals
    • Y02P20/55Design of synthesis routes, e.g. reducing the use of auxiliary or protecting groups

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Abstract

The invention discloses a method for synthesizing monohydroxy acetylated hesperidin, which takes hesperidin as a starting material, firstly uses acetic anhydride to protect all hydroxyl groups and synthesizes the acetylated hesperidin, and after the acetylated hesperidin is hydrogenated by catalytic transfer of an iridium metal catalyst, carbonyl groups on an acetylated hesperidin chromone structure are reduced with high chemo-selectivity, so that a target product monohydroxy acetylated hesperidin with only one hydroxyl group is obtained. The method has the advantages of simple operation steps, mild conditions, high catalytic activity, high chemical selectivity and high yield of the target compound. The monohydroxy acetylated hesperidin obtained by the invention can be further connected with a hydrophobic drug molecule, and can be selectively deacetylated to form an amphiphilic drug molecule to be further prepared into a nano prodrug to realize efficient drug delivery, so that the hesperidin and the hydrophobic drug molecule can exert drug effects simultaneously, or can be efficiently connected with other functional structures, so that other effects can be exerted while the drug effects of the hesperidin are realized, and the modification of physical properties of the hesperidin can also be realized.

Description

Synthetic method of monohydroxy acetylated hesperidin
Technical Field
The invention belongs to the technical field of organic synthesis, and particularly relates to a method for synthesizing monohydroxy acetylated hesperidin.
Background
Hesperidin is a flavonoid glycoside rich in citrus fruits and has antioxidant and antiinflammatory activities. There is growing evidence that hesperidin can inhibit tumor proliferation by inducing apoptosis and cell cycle arrest, inhibiting tumor cell migration and angiogenesis. In addition, hesperidin can enhance antitumor effect of doxorubicin, cytarabine, tamoxifen or quercetin, and reduce hepatorenal toxicity induced by cisplatin, lipopolysaccharide, sodium arsenite, cyclophosphamide, methotrexate and acrylamide. However, the clinical application of hesperidin is greatly limited due to poor water solubility and poor bioavailability. At present, the hesperidin can be delivered only by means of nanoparticle encapsulation and the like, however, the method has the advantages of extremely high cost, low drug loading rate and low efficiency. Therefore, by linking the molecule with good water solubility and high bioavailability with hesperidin or by making into high drug-carrying nano-preparation, the preparation becomes an important solution for high-efficiency delivery and achieving the functions.
However, hesperidin molecules are chemically inert and poorly reactive, which presents great difficulties for the attachment to other molecules. The hydroxyl can be used as a better active modification site, but the characteristics of different activity degrees of each hydroxyl in the hesperidin molecule, numerous hydroxyl groups and distribution at a plurality of positions of the molecule bring difficulty to site-directed modification of the structure. Only one hydroxyl active site is designed and synthesized, and the hesperidin molecule which protects other hydroxyl has important value. Acetylation protection of hydroxyl groups is the most common mode of hydroxyl protection, and is used in large amounts in organic synthesis due to the ease of selective removal of acetyl groups, etc. The method for synthesizing the monohydroxy acetylated hesperidin by protecting all hydroxyl groups in molecules and reducing carbonyl groups at the chromone position into hydroxyl groups is the simplest method, but no report on success is made at present, wherein one important reason is that the activity of a reducing agent is insufficient or the chemical selectivity is lacking when a traditional reduction method is used for the chromone region of the hesperidin molecules, so that the ketocarbonyl groups on the acetylated hesperidin cannot be reduced or acetyl (partial acetyl groups) can be reduced, and therefore, the searching of a proper reduction method or reducing agent is the key for successfully synthesizing the monohydroxy acetylated hesperidin, and has important research value.
Disclosure of Invention
The invention aims to overcome the difficulty that only a single carbonyl group of an acetylated hesperidin with 9 carbonyl groups is selectively reduced in a chromone region, and provides a method for synthesizing monohydroxy acetylated hesperidin with high activity and high chemical selectivity.
Aiming at the purposes, the technical scheme adopted by the invention comprises the following steps:
(1) Protecting all hydroxyl groups on the hesperidin 1 by using an acetylating reagent to obtain acetylated hesperidin 2;
(2) And (3) reducing the ketocarbonyl into hydroxyl by the acetylated hesperidin 2 under the action of an iridium metal catalyst 3 to obtain monohydroxy acetylated hesperidin.
In the step (1), the acetylating reagent is any one of acetic anhydride, acetyl chloride and glacial acetic acid.
In the step (2), the iridium metal catalyst 3 is preferably used in an amount of 1 to 2% by mol based on the amount of the acetylated hesperidin 2. The iridium metal catalyst 3 is synthesized by the method in the literature of "Gang Zhou, ahmed H.Aboo, craig M.Robertson, ruixia Liu, zhenhua Li, konstantin Luzyanin, neil G.Berry, weiping Chen, and Jianliang Xiao, ACS Catalysis 2018 (9), 8020-8026".
In the step (2), the reaction temperature for reducing the ketocarbonyl group to the hydroxyl group is 20-40 ℃.
In the step (2), the solvent used for reducing the ketone carbonyl into hydroxyl is selected from any one of pyridine, ethyl acetate, tetrahydrofuran, N-dimethylformamide, dimethyl sulfoxide, dichloromethane and chloroform.
The beneficial effects of the invention are as follows:
the invention adopts a simple and easily obtained iridium metal catalyst to complete high chemical selectivity transfer hydrogenation of acetylated hesperidin with 9 carbonyl groups, and obtains monohydroxy acetylated hesperidin with carbonyl groups reduced to hydroxyl groups in a chromone region, and the product can be formed by connecting other molecules with good water solubility and high bioavailability together through a simple chemical reaction by a one-step reaction, or can be further prepared into a high-drug-loading nano preparation.
Drawings
Fig. 1 is a graph showing THE effect of THE THE nanomedicine prepared by monohydroxy acetylated hesperidin on inhibiting proliferation of bladder cancer cells.
Figure 2 is a graph of THE effect of THE THE nanomedicine prepared by monohydroxy acetylated hesperidin in inhibiting bladder cancer in mice.
Fig. 3 is a graph showing THE hepatotoxic effects of THE THE nanomedicine prepared by monohydroxy acetylated hesperidin in reducing triptolide alone.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, but the scope of the present invention is not limited to these examples.
In the following examples, the specific synthesis method of the iridium metal catalyst 3 used is: oxazoline methyl ester (100 mg, racemization), pentamethyl cyclopentadienyl iridium dichloride dimer (170 mg) and sodium acetate (402 mg) are placed in a 25 mL reaction tube, the operation of vacuumizing and argon filling is carried out for three times by double-row tubes, water (1 mL) and methylene dichloride (10 mL) are added, and the reaction is carried out for 24 hours at room temperature. The reaction solution was filtered through celite, washed with water and saturated brine, dried over anhydrous sodium sulfate, and recrystallized from a 1:1 volume ratio of diethyl ether to n-hexane to give yellow solid iridium metal catalyst 3 (165 mg, 62%). The synthetic route is as follows:
the structural characterization data of the obtained iridium metal catalyst 3 are as follows: 1 H NMR(400MHz,CDCl 3 )δ8.38(d,J=7.6Hz,2H),7.62–7.56(m,1H),7.49–7.42(m,2H),4.88(dd,J=11.0,8.2Hz,1H),4.84–4.75(m,1H),4.51(dd,J=11.9,8.1Hz,1H),1.64(s,15H). 13 C NMR(101MHz,CDCl 3 )δ175.01,167.38,133.32,129.99,128.27,124.14,85.15,72.05,71.28,9.21.HRMS for C 20 H 23 ClIrNO 3 [M+Na] + m/z theory 576.0894; found 576.0889.
Example 1
(1) Hesperidin 1 (6.1 g) was dissolved in pyridine (50 mL), and acetic anhydride (50 mL) was added to the solution and reacted at 90 ℃ for 24 hours. After the reaction solution is cooled to room temperature, the solvent is dried by spin, 200mL of water is added, after the mixture is fully stirred, the water is filtered, the obtained solid filter residue is dissolved by chloroform, then dried by anhydrous sodium sulfate, the dried mixture is dried by spin to obtain a crude product, and the crude product is subjected to column chromatography by taking a mixed solution with the volume ratio of normal hexane to ethyl acetate being 3:1 as a developing agent to obtain pure white solid acetylated hesperidin 2 (7.1 g, 75%), wherein the structural characterization data are as follows: 1 H NMR(400MHz,CDCl 3 )δ7.36(d,J=8.8Hz,1H),7.16(d,J=2.3Hz,1H),7.00(d,J=8.5Hz,1H),6.47(d,J=2.5Hz,1H),6.31(d,J=2.4Hz,1H),5.48–5.37(m,1H),5.25(d,J=16.1Hz,6H),5.02(t,J=10.2Hz,1H),4.69(s,1H),3.92–3.90(m,1H),3.86(s,3H),3.81(dt,J=11.7,3.3Hz,2H),3.64(td,J=11.6,10.4,4.9Hz,1H),2.99(dd,J=16.6,12.9Hz,1H),2.76(dd,J=16.6,3.0Hz,1H),2.38(s,3H),2.33(s,3H),2.09(s,3H),2.08(s,3H),2.04(s,9H),1.96(s,3H),1.15(d,J=6.3Hz,3H). 13 C NMR(101MHz,CDCl 3 )δ188.73,170.19,170.03,169.85,169.34,169.15,168.87,163.80,161.89,151.89,151.59,139.93,130.74,124.95,121.18,112.45,109.60,105.91,102.16,98.09,97.59,78.68,77.22,73.26,72.45,70.87,70.80,69.36,68.97,68.61,66.66,66.15,56.04,21.05,20.80,20.66,20.63,20.60,17.28.HRMS C 44 H 50 O 23 [M+H] + m/z theory 946.2723; found 946.2743.
(2) Acetylated hesperidin 2 (2.0 g,2.11 mmol) and iridium metal catalyst 3 (13 mg,0.021 mmol) were placed in a reaction tube, the reaction tube was evacuated and argon-filled three times, methylene chloride (5 mL) was added for dissolution, and then formic acid-triethylamine azeotrope (5 mL) was added for reaction at room temperature for 10 hours. After the reaction liquid is washed by water, the reaction liquid is dried by anhydrous sodium sulfate, the solvent is dried by spin to obtain a crude product, and pure product which is yellow solid monohydroxy acetylated hesperidin (1.6 g, 79%) is obtained after column chromatography (eluent is mixed liquid of ethyl acetate and n-hexane in a volume ratio of 3:1), and the structural characterization data are as follows: 1 H NMR(400MHz,CDCl 3 )δ7.33–7.28(m,1H),7.16(t,J=2.3Hz,1H),7.05–6.97(m,1H),6.48(d,J=2.5Hz,1H),6.32(d,J=2.4Hz,1H),5.49–5.35(m,1H),5.30–5.10(m,7H),5.02(t,J=10.0Hz,1H),4.70(s,1H),3.95–3.87(m,1H),3.86(s,3H),3.85–3.75(m,1H),3.64(td,J=11.6,10.4,4.9Hz,1H),3.69–3.58(m,1H),3.11–2.92(m,1H),2.79–2.66(m,1H),2.38(s,3H),2.35(s,3H),2.09(s,3H),2.08(s,3H),2.04(s,9H),1.96(s,3H),1.15(d,J=6.2Hz,3H). 13 C NMR(101MHz,CDCl 3 )δ170.17,170.01,169.77,169.44,169.33,169.14,168.85,163.98,163.80,161.88,151.88,151.58,139.93,130.74,124.94,121.18,112.45,109.60,105.90,102.16,98.08,97.58,78.67,73.26,72.44,70.87,70.80,69.35,68.97,68.63,66.66,66.14,56.03,53.81,21.04,20.79,20.75,20.64,20.61,20.59,17.27.HRMS C 44 H 52 O 23 [M+H] + m/z theory 948.2919; found 948.2932.
Application example of monohydroxy acetylated hesperidin
Triptolide is a class of highly antitumor active molecules extracted from natural products (J.T.Wen, J.Liu, L.Wan, L.Xin, J.C.Guo, Y.Q.Sun, X.Wang, J.Wang, int Immunopharmacol 2022,106,108616;P.Noel,D.D.Von Hoff,A.K.Saluja,M.Velagapudi,E.Borazanci,H.Han,Trends in pharmacological sciences 2019,40,327.) but is highly hydrophobic, low in bioavailability and highly toxic (M.Yanchun, W.Yi, W.Lu, Q.Yu, Y.Jian, K.Pengzhou, Y.Ting, L.Hongyi, W.Fang, C.Xiaolong, C.Yongping, eur J Pharmacol 2019,851,43;L.Zhao,Z.Lan,L.Peng,L.Wan,D.Liu,X.Tan,C.Tang,G.Chen,H.Liu,Cell Prolif 2022,55,e13278;J.Wen,J.Liu,X.Wang,J.Wang,Phytother Res 2021,35,4334.). THE monohydroxy acetylated hesperidin (I) is connected with triptolide which is simply modified by succinic anhydride, and after acetyl selective deprotection, THE amphiphilic THE molecule can be obtained, and THE molecule is further self-assembled into THE THE nano prodrug.
Fig. 1 is an experimental result that THE THE nano-drug prepared by monohydroxy acetylated hesperidin can effectively inhibit proliferation of bladder cancer cells. 5637 cells were treated with THE indicated doses of THE THE nanomedicine for 14 hours and stained with crystal violet. Comparison with a control group without nano-drug shows that THE THE nano-drug prepared by monohydroxy acetylated hesperidin can obviously observe THE proliferation of bladder cancer cells at 2 mu M, and THE inhibition is more obvious at 4 mu M.
Figure 2 is an experimental model and results of THE significant inhibition of bladder cancer in mice by THE THE nanomedicine prepared by monohydroxyacetylated hesperidin. Wherein, A is a schematic diagram of the establishment and treatment of a bladder cancer model, showing that the bladder cancer model is established in 7 days, and the bladder cancer model is killed after 20 days in a treatment period of 1 to 15 days after the model is determined; THE THE nano-drug prepared by THE monohydroxy acetylated hesperidin can efficiently enter THE inside of a tumor through tail vein injection, and a small animal imaging result shows that THE THE nano-drug can be efficiently delivered to THE tumor part of a mouse; c is that THE mice are sacrificed after 20 days of treatment, and THE obtained size comparison of THE bladder cancer tissues can show that THE THE nano-drug can effectively inhibit bladder cancer in THE mice.
Fig. 3 is an experimental result that THE THE nano-drug prepared by monohydroxy acetyl hesperidin can effectively reduce hepatotoxicity caused by single administration of triptolide. Performing blood index and biochemical index analysis on a C57 mouse by injecting PBS, 8.5mg/kg hesperidin, 5mg/kg triptolide and 15mg/kg THE nano-drug through tail vein for 24 hours respectively, wherein n=3; scale dimensions 50 μm, p <0.05; * P <0.01; * P <0.001; a-E: THE results of mice treated with triptolide alone are obviously abnormal in blood and biochemical indexes, THE results of THE triptolide are obviously toxic to THE livers of THE mice, but THE results of THE hesperidin and THE nano-drug are compared with THE results of a control group, THE results of THE hesperidin and THE nano-drug are not obviously toxic to THE livers of THE mice, and THE results of THE triptolide and THE nano-drug prepared by monohydroxy acetyl hesperidin are reflected to obviously reduce THE hepatotoxicity compared with THE triptolide.
THE results of fig. 1 to 3 are combined to show that THE THE nano-drug prepared by THE monohydroxy acetyl hesperidin can play THE role of THE synergistic inhibition of bladder cancer by THE hesperidin and THE triptolide, not only improves THE bioavailability of THE triptolide, but also utilizes THE high anti-tumor activity of THE triptolide, and simultaneously reduces THE problem of high toxicity of THE triptolide by THE hesperidin.

Claims (5)

1. The synthesis method of the monohydroxy acetylated hesperidin is characterized by comprising the following steps of:
(1) Protecting all hydroxyl groups on the hesperidin 1 by using an acetylating reagent to obtain acetylated hesperidin 2;
(2) And (3) reducing the ketocarbonyl into hydroxyl by the acetylated hesperidin 2 under the action of an iridium metal catalyst 3 to obtain monohydroxy acetylated hesperidin.
2. The method for synthesizing monohydroxyacetylated hesperidin according to claim 1, characterized in that: in the step (1), the acetylating reagent is any one of acetic anhydride, acetyl chloride and glacial acetic acid.
3. The method for synthesizing monohydroxyacetylated hesperidin according to claim 1, characterized in that: in the step (2), the amount of the iridium metal catalyst 3 is 1-2% of the molar amount of the acetylated hesperidin 2.
4. The method for synthesizing monohydroxyacetylated hesperidin according to claim 1, characterized in that: in the step (2), the reaction temperature for reducing the ketone carbonyl group into the hydroxyl group is 20-40 ℃.
5. The method for synthesizing monohydroxyacetylated hesperidin according to claim 1, characterized in that: in the step (2), the solvent used for reducing the ketone carbonyl into hydroxyl is selected from any one of pyridine, ethyl acetate, tetrahydrofuran, N-dimethylformamide, dimethyl sulfoxide, dichloromethane and chloroform.
CN202310583070.3A 2023-05-23 2023-05-23 Synthetic method of monohydroxy acetylated hesperidin Pending CN116606335A (en)

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