CN111574447A - Levatinib-3, 5-dihydroxy benzoic acid eutectic crystal and application thereof - Google Patents

Abstract

The invention discloses a Levatinib-3, 5-dihydroxy benzoic acid eutectic and application thereof. The eutectic crystal consists of a compound shown in a formula (I) and a compound shown in a formula (II), and an X-ray powder diffraction pattern of the crystal form has diffraction peaks at the following 2 theta angles: 6.4 degrees +/-0.2 degrees, 8.0 degrees +/-0.2 degrees, 10.3 degrees +/-0.2 degrees, 11.6 degrees +/-0.2 degrees, 12.4 degrees +/-0.2 degrees, 16.0 degrees +/-0.2 degrees, 16.5 degrees +/-0.2 degrees, 19.4 degrees +/-0.2 degrees, 21.7 degrees +/-0.2 degrees, 23.2 degrees +/-0.2 degrees, 25.1 degrees +/-0.2 degrees and 25.7 degrees +/-0.2 degrees. The eutectic can be used for inhibiting vascular endothelial growth factor receptors, fibroblast growth factor receptors, platelet-derived growth factor receptors and protooncogenes, and can be used for preventing and/or treating thyroid cancer or liver cancer.

Description

Levatinib-3, 5-dihydroxy benzoic acid eutectic crystal and application thereof

Technical Field

The invention relates to the field of biomedicine, in particular to a Levatinib-3, 5-dihydroxy benzoic acid eutectic and application thereof.

Background

Lenvatinib, an anticancer drug marketed by kawasaki corporation, is approved for the treatment of thyroid and liver cancers. Lenvatinib is a multienzyme inhibitor that inhibits three vascular endothelial growth factor receptors (VEGFR1,2,3), fibroblast growth factor receptors (FGFR 1,2,3,4), platelet-derived growth factor receptors (PDGFR) and proto-oncogenes.

Pharmaceutically referred to as co-crystals, are crystals of an Active Pharmaceutical Ingredient (API) and a co-crystal former (CCF) bound together by hydrogen bonds or other non-covalent bonds, wherein the API and CCF are solids in pure form at room temperature and a fixed stoichiometric ratio exists between the components. A co-crystal is a multi-component crystal that contains both a binary co-crystal formed between two neutral solids and a multicomponent co-crystal formed between a neutral solid and a salt or solvate.

Currently, there is little research on the eutectic of lenvatinib, and thus the eutectic of lenvatinib remains to be developed.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the invention provides a Levatinib-3, 5-dihydroxy benzoic acid (LVB-3,5-DBA) eutectic which has similar dissolution rate with the marketed drug-Levatinib mesylate and higher stability.

In a first aspect of the invention, a co-crystal is presented. According to an embodiment of the invention, the co-crystal consists of a compound of formula (I) and a compound of formula (II) and has an X-ray powder diffraction pattern with diffraction peaks at the following 2 θ angles: 6.4 degrees +/-0.2 degrees, 8.0 degrees +/-0.2 degrees, 10.3 degrees +/-0.2 degrees, 11.6 degrees +/-0.2 degrees, 12.4 degrees +/-0.2 degrees, 16.0 degrees +/-0.2 degrees, 16.5 degrees +/-0.2 degrees, 19.4 degrees +/-0.2 degrees, 21.7 degrees +/-0.2 degrees, 23.2 degrees +/-0.2 degrees, 25.1 degrees +/-0.2 degrees, 25.7 degrees +/-0.2 degrees,

the inventors found that the above co-crystal has a similar dissolution rate to that of the marketed drug-lenvatinib mesylate, but has lower hygroscopicity, higher chemical stability, higher thermal stability and higher bioavailability than lenvatinib mesylate.

According to an embodiment of the present invention, the eutectic may further include at least one of the following additional technical features:

according to an embodiment of the invention, the molar ratio of the compound of formula (I) to the compound of formula (II) is 2: 1.

According to an embodiment of the invention, the co-crystal has an X-ray powder diffraction pattern substantially as shown in figure 1.

According to an embodiment of the invention, the differential scanning calorimetry curve of the co-crystal has an endothermic peak at 216 ℃ ± 3 ℃.

According to an embodiment of the invention, the co-crystal has a differential scanning calorimetry curve substantially as shown in figure 2.

In a second aspect of the invention, a method of preparing a co-crystal of a compound of formula (I) and a compound of formula (II) is provided. According to an embodiment of the invention, the method comprises: crystallizing the compound shown in the formula (I) and the compound shown in the formula (II) in a mixed solvent of methanol and dichloromethane so as to obtain a eutectic crystal. Thus, the operation is simple and the eutectic crystal can be obtained.

According to an embodiment of the present invention, the method may further include at least one of the following additional technical features:

according to an embodiment of the invention, the molar ratio of the compound of formula (I) to the compound of formula (II) is at most 2: 1. The inventors have found that increasing the relative amount of compound of formula (II) is effective to promote the formation of a co-crystal at a molar ratio of compound of formula (I) to compound of formula (II) of at most 2: 1.

According to the embodiment of the invention, the molar ratio of the compound shown in the formula (I) to the compound shown in the formula (II) is 2: 6-2: 1.

According to a specific embodiment of the present invention, the molar ratio of the compound of formula (I) to the compound of formula (II) is 1: 1.

According to the embodiment of the invention, the volume ratio of methanol to dichloromethane in the methanol/dichloromethane mixed solvent is 1:100-100: 1.

According to the embodiment of the invention, the volume ratio of methanol to dichloromethane in the methanol/dichloromethane mixed solvent is 1:1, and the molar volume ratio of the compound shown in the formula (II) to the methanol/dichloromethane mixed solvent is at least 0.6mmol:5 mL.

According to the embodiment of the invention, the molar volume ratio of the compound shown in the formula (II) to the methanol/dichloromethane mixed solvent is 1.17mmol:5 mL.

According to an embodiment of the invention, the final solid content of the co-crystal in the methanol/dichloromethane mixed solvent is 1-50%. Wherein the final solid content refers to the mass-to-volume ratio of the eutectic in the methanol/dichloromethane mixed solvent, for example, a solid content of 1% refers to 1g of the eutectic per 100mL of the solvent.

In a third aspect of the invention, a pharmaceutical composition is provided. According to an embodiment of the invention, the pharmaceutical composition comprises: the co-crystal as hereinbefore described or a co-crystal prepared according to the method as hereinbefore described. Therefore, the pharmaceutical composition provided by the embodiment of the invention can inhibit vascular endothelial growth factor receptors, fibroblast growth factor receptors, platelet-derived growth factor receptors and protooncogenes, and further can be used for preventing and/or treating thyroid cancer or liver cancer.

According to an embodiment of the present invention, the above pharmaceutical composition may further comprise at least one of the following additional technical features:

according to an embodiment of the present invention, the pharmaceutical composition further comprises a pharmaceutically acceptable carrier, excipient, diluent, adjuvant, vehicle or combination thereof.

In a fourth aspect, the present invention proposes the use of the aforementioned co-crystal or the co-crystal prepared according to the aforementioned method or the aforementioned pharmaceutical composition for the preparation of a medicament for the prevention and/or treatment of thyroid cancer or liver cancer.

In a fifth aspect, the present invention proposes the use of the aforementioned co-crystal or the co-crystal prepared according to the aforementioned method or the aforementioned pharmaceutical composition for the preparation of a medicament for inhibiting vascular endothelial growth factor receptor, fibroblast growth factor receptor, platelet derived growth factor receptor and proto-oncogene.

According to an embodiment of the present invention, the above-mentioned use may further include at least one of the following additional technical features:

according to an embodiment of the invention, the vascular endothelial growth factor receptor comprises at least one of the factors selected from the group consisting of: VEGFR1, VEGFR2, and VEGFR 3.

According to an embodiment of the invention, the fibroblast growth factor receptor comprises at least one factor selected from the group consisting of: FGFR 1, FGFR 2, FGFR 3 and FGFR 4.

Drawings

FIG. 1 is an X-ray powder diffraction pattern of a crystalline form according to an embodiment of the present invention;

FIG. 2 is a differential scanning calorimetry curve of a crystalline form according to an embodiment of the invention;

FIG. 3 is a PXRD pattern of the LVB-3,5-DBA co-crystal, the bulk drug Lenvatinib (LVB) and the co-crystal former 3,5-DBA according to embodiments of the present invention;

FIG. 4 is a TGA analysis of a LVB-3,5-DBA co-crystal with the bulk drug Lenvatinib (LVB), 3, 5-dihydroxybenzoic acid (3,5-DBA) according to an embodiment of the present invention;

FIG. 5 is the inherent dissolution results of the LVB-3,5-DBA co-crystal with the marketed LVB mesylate according to an embodiment of the present invention;

fig. 6 is a result of eutectic screening according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. All patents and publications referred to herein are incorporated by reference in their entirety. Although any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention, the preferred methods, devices, and materials are described herein.

Information such as change, crystallinity, crystal structure state and the like of the crystal form can be detected by X-ray powder diffraction (XRPD), and the method is a common means for identifying the crystal form. The peak positions of the XRPD patterns depend primarily on the structure of the crystalline form, being relatively insensitive to experimental details, while their relative peak heights depend on a number of factors related to sample preparation and instrument geometry. Accordingly, in some embodiments, the crystalline form of the present invention is characterized by an XRPD pattern having certain peak positions, substantially as shown in the XRPD patterns provided in the figures of the present invention. Also, the 2 θ measurement of the XRPD pattern may have experimental error, and the 2 θ measurement of the XRPD pattern may be slightly different from instrument to instrument and from sample to sample, so the 2 θ value cannot be considered absolute. The diffraction peaks have a tolerance of ± 0.2 ° according to the conditions of the instrument used in the test according to the invention.

Differential Scanning Calorimetry (DSC) is carried out by continuously heating or cooling under program control to measure sample and inert reference substance (usually α -Al)₂O₃) The energy difference therebetween varies with temperature. The melting peak height of the DSC curve depends on many factors related to sample preparation and instrument geometry, while the peak position is relatively insensitive to experimental details. Thus, in some embodiments, the crystalline form of the present invention is characterized by a DSC profile with characteristic peak positions substantially as shown in the DSC profiles provided in the figures of the present invention. Meanwhile, the DSC spectrum may have experimental errors, and the peak position and the peak value of the DSC spectrum may slightly differ among different instruments and different samples, so that the peak position or the peak value of the endothermic peak of the DSC spectrumThe value of the peak cannot be considered absolute. According to the conditions of the instrument used in the test of the invention, the melting peak has a tolerance of + -3 ℃.

Differential Scanning Calorimetry (DSC) can also be used for detecting and analyzing whether the crystal form has crystal transformation or crystal mixing phenomenon.

Solids of the same chemical composition often form isomeric, or referred to as metamorphosis, isomers of different crystal structures under different thermodynamic conditions, and this phenomenon is called polymorphism or homomultiphase phenomenon. When the temperature and pressure conditions are changed, the variants are transformed into each other, and the phenomenon is called crystal transformation. Due to the crystal form transformation, the mechanical, electrical, magnetic and other properties of the crystal can be changed greatly. When the temperature of the crystal form transformation is in a measurable range, the transformation process can be observed on a Differential Scanning Calorimetry (DSC) chart, and the DSC chart is characterized in that the DSC chart has an exothermic peak reflecting the transformation process and simultaneously has two or more endothermic peaks which are respectively characteristic endothermic peaks of different crystal forms before and after transformation.

Thermogravimetric analysis (TGA) is a technique for measuring the change in mass of a substance with temperature under program control, and is suitable for examining the loss of a solvent in a crystal or the sublimation and decomposition of a sample, and it can be presumed that the crystal contains crystal water or a crystal solvent. The change in mass shown by the TGA profile depends on many factors such as sample preparation and instrumentation; the mass change of the TGA detection varies slightly from instrument to instrument and from sample to sample.

In the context of the present invention, the 2 θ values in the X-ray powder diffraction pattern are all in degrees (°).

The term "crystallization process" refers to the process by which crystals are formed in solution.

The term "substantially as shown" means that at least 50%, or at least 60%, or at least 70%, or at least 80%, or at least 90%, or at least 95%, or at least 99% of the peaks in the X-ray powder diffraction pattern or DSC pattern or raman spectrum or infrared spectrum are shown in the figure.

When referring to a spectrogram or/and data appearing in a graph, "peak" refers to a feature that one skilled in the art would recognize as not being attributable to background noise.

By "substantially pure" is meant that a crystalline form is substantially free of one or more additional crystalline forms, i.e., the crystalline form is at least 80%, or at least 85%, or at least 90%, or at least 93%, or at least 95%, or at least 98%, or at least 99%, or at least 99.5%, or at least 99.6%, or at least 99.7%, or at least 99.8%, or at least 99.9% pure, or the crystalline form contains additional crystalline forms, the percentage of which in the total volume or weight of the crystalline form is less than 20%, or less than 10%, or less than 5%, or less than 3%, or less than 1%, or less than 0.5%, or less than 0.1%, or less than 0.01%.

By "substantially free" is meant that the percentage of one or more other crystalline forms in the total volume or weight of the crystalline form is less than 20%, or less than 10%, or less than 5%, or less than 4%, or less than 3%, or less than 2%, or less than 1%, or less than 0.5%, or less than 0.1%, or less than 0.01%.

"relative intensity" refers to the ratio of the intensity of the first strong peak to the intensity of the other peaks when the intensity of the first strong peak is 100% of all the diffraction peaks in an X-ray powder diffraction pattern (XRPD).

In the context of the present invention, the word "about" or "approximately" when used or whether used, means within 10%, suitably within 5%, and especially within 1% of a given value or range. Alternatively, the term "about" or "approximately" means within an acceptable standard error of the mean, for one of ordinary skill in the art. Whenever a number is disclosed with a value of N, any number within the values of N +/-1%, N +/-2%, N +/-3%, N +/-5%, N +/-7%, N +/-8% or N +/-10% is explicitly disclosed, wherein "+/-" means plus or minus.

The term "comprising" or "comprises" is open-ended, i.e. comprising what is specified in the present invention, but not excluding other aspects.

Unless otherwise indicated, the structural formulae depicted herein include all isomeric forms (e.g., enantiomeric, diastereomeric, and geometric (or conformational) isomers): such as the R, S configuration containing an asymmetric center, the (Z), (E) isomers of the double bond, and the conformational isomers of (Z), (E). Thus, individual stereochemical isomers of the compounds of the present invention or mixtures of enantiomers, diastereomers, or geometric isomers (or conformers) thereof are within the scope of the present invention.

Unless otherwise indicated, all tautomeric forms of the compounds of the invention are included within the scope of the invention. In addition, unless otherwise indicated, the structural formulae of the compounds described herein include isotopically enriched concentrations of one or more different atoms.

The definition and convention of stereochemistry in the present invention is generally used with reference to the following documents: S.P. Parker, Ed., McGraw-Hill Dictionary of Chemical Terms (1984) McGraw-Hill Book Company, New York; and Eliel, E.and Wilen, S., "stereoschemistry of Organic Compounds", John Wiley & Sons, Inc., New York,1994. All stereoisomeric forms of the compounds of the present invention, including, but in no way limited to, diastereomers, enantiomers, atropisomers, and mixtures thereof, such as racemic mixtures, form part of the present invention. Many organic compounds exist in optically active form, i.e., they have the ability to rotate the plane of plane polarized light. In describing optically active compounds, the prefix D, L or R, S is used to indicate the absolute configuration of the chiral center of the molecule. The prefixes d, l or (+), (-) are used to designate the sign of the rotation of plane polarized light of the compound, with (-) or l indicating that the compound is left-handed and the prefix (+) or d indicating that the compound is right-handed. The chemical structures of these stereoisomers are identical, but their stereo structures are different. A particular stereoisomer may be an enantiomer, and a mixture of isomers is commonly referred to as a mixture of enantiomers. A 50:50 mixture of enantiomers is referred to as a racemic mixture or racemate, which may result in no stereoselectivity or stereospecificity during the chemical reaction. The terms "racemic mixture" and "racemate" refer to a mixture of two enantiomers in equimolar amounts, lacking optical activity.

As described herein, the pharmaceutically acceptable compositions of the present invention further comprise a pharmaceutically acceptable carrier, adjuvant, or excipient, as used herein, including any solvent, diluent, or other liquid excipient, dispersant or suspending agent, surfactant, isotonic agent, thickening agent, emulsifier, preservative, solid binder or lubricant, and the like, as appropriate for the particular target dosage form. As described in the following documents: in Remington, The Science and practice of Pharmacy,21st edition,2005, ed.D.B.Troy, Lippincott Williams & Wilkins, Philadelphia, and Encyclopedia of Pharmaceutical Technology, eds.J.Swarbrickand J.C.Boylan, 1988. Annu 1999, Marcel Dekker, New York, taken together with The disclosure of The references herein, indicate that different carriers can be used In The preparation of pharmaceutically acceptable compositions and their well-known methods of preparation. Except insofar as any conventional carrier vehicle is incompatible with the crystalline or amorphous form of the compound of formula (I) herein, e.g., any adverse biological effects that result or interaction with any other component of a pharmaceutically acceptable composition in a deleterious manner, its use is contemplated by the present invention.

Materials that can serve as pharmaceutically acceptable carriers include, but are not limited to, ion exchangers; aluminum; aluminum stearate; lecithin; serum proteins, such as human serum albumin; buffer substances such as phosphates; glycine; sorbic acid; potassium sorbate; partial glyceride mixtures of saturated vegetable fatty acids; water; salts or electrolytes, such as protamine sulfate, disodium hydrogen phosphate, potassium hydrogen phosphate, sodium chloride, zinc salts; colloidal silica; magnesium trisilicate; polyvinylpyrrolidone; polyacrylate esters; a wax; polyethylene-polyoxypropylene-blocking polymers; lanolin; sugars such as lactose, glucose and sucrose; starches such as corn starch and potato starch; cellulose and its derivatives such as sodium carboxymethyl cellulose, ethyl cellulose and cellulose acetate; gum powder; malt; gelatin; talc powder; adjuvants such as cocoa butter and suppository waxes; oils such as peanut oil, cottonseed oil, safflower oil, sesame oil, olive oil, corn oil and soybean oil; glycols, such as propylene glycol and polyethylene glycol; esters such as ethyl oleate and ethyl laurate; agar; buffering agents such as magnesium hydroxide and aluminum hydroxide; alginic acid; pyrogen-free water; isotonic salt; ringer's solution; ethanol; phosphoric acid buffer solution; and other non-toxic suitable lubricants such as sodium lauryl sulfate and magnesium stearate; a colorant; a release agent; coating the coating material; a sweetener; a flavoring agent; a fragrance; preservatives and antioxidants.

The co-crystals of the present invention may be administered in the form of oral agents such as tablets, capsules (each of which includes sustained-release or timed-release formulations), pills, powders, granules, elixirs, tinctures, suspensions, syrups, and emulsions. They may also be administered intravenously (bolus or infusion), intraperitoneally, subcutaneously, or intramuscularly, all using dosage forms well known to those of ordinary skill in the pharmaceutical arts. They may be administered separately, but will generally be administered together with a pharmaceutical carrier selected based on the mode of administration selected and standard pharmaceutical practice.

The dosage regimen of the co-crystals of the invention will vary depending upon a variety of factors known, such as the pharmacokinetic characteristics of the particular agent and its mode and route of administration; race, age, sex, health condition, medical condition, and weight of the recipient; the nature and extent of the symptoms; the kind of concurrent therapy; the frequency of treatment; the route of administration, the renal and hepatic function of the patient, and the desired effect. A physician or veterinarian can make a decision and prescribe the effective amount of the drug to prevent, counter or arrest the progression of thyroid or liver cancer.

The co-crystals of the invention may be administered in intranasal form via topical use of a suitable intranasal vehicle, or by the transdermal route using a transdermal patch. When administered in the form of a transdermal delivery system, the dosage administered throughout the administration period is continuous rather than intermittent.

Typically, the co-crystals of the present invention are administered in admixture with suitable pharmaceutical diluents, excipients, or carriers (referred to herein as pharmaceutical carriers) selected with regard to the form of administration and conventional pharmaceutical practice, which may be in the form of oral tablets, capsules, elixirs, syrups, and the like.

For example, for oral administration in the form of a tablet or capsule, the active pharmaceutical ingredient may be combined with an oral, non-toxic, pharmaceutically acceptable, inert carrier, such as lactose, starch, sucrose, glucose, methyl cellulose, magnesium stearate, dicalcium phosphate, calcium sulfate, mannitol, sorbitol and the like; for oral administration in liquid form, the oral pharmaceutical composition may be combined with any oral, non-toxic, pharmaceutically acceptable inert carrier, such as ethanol, glycerol, water and the like. Moreover, suitable binders, lubricants, disintegrating agents, and coloring agents can also be added to the mixture, as desired or necessary. Suitable binders include starch, gelatin, natural sugars such as glucose or beta-lactose, corn sweeteners, natural and synthetic gums such as acacia, tragacanth, or sodium alginate, carboxymethylcellulose, polyethylene glycol, waxes and the like. Lubricants used in these dosage forms include sodium oleate, sodium stearate, magnesium stearate, sodium benzoate, sodium acetate, sodium chloride, and the like. Disintegrating agents include, but are not limited to, starch, methylcellulose, agar, bentonite, xanthan gum, and the like.

The co-crystals of the invention may also be administered in the form of liposome delivery systems, such as small unilamellar vesicles, large unilamellar vesicles and multilamellar vesicles. Liposomes can be formed from different phospholipids, such as cholesterol, stearylamine, or phosphatidylcholines.

The co-crystals of the invention are also conjugated to soluble polymers that act as targeted drug carriers. Such polymers include polyvinylpyrrolidone, pyran copolymer, polyhydroxypropylmethacrylamide-phenol, polyhydroxyethylaspartamidephenol, or polyethylene oxide-polylysine substituted with palmitoyl residues. Furthermore, the co-crystals of the present invention may be coupled to a class of biodegradable polymers for achieving controlled drug release, for example, polylactic acid, polyglycolic acid, copolymers of polylactic and polyglycolic acid, polycaprolactone, polyhydroxybutyric acid, polyorthoesters, polyacetals, polydihydropyrans, polycyanoacrylates, and cross-linked or amphipathic block copolymers of hydrogels.

Each unit dose of a dosage form (pharmaceutical composition) suitable for administration may contain from about 1mg to about 100mg of the active ingredient. In these pharmaceutical compositions, the weight of the active ingredient will generally be from about 0.5% to about 95% of the total weight of the composition.

Gelatin capsules may contain the active ingredient in combination with powder carriers such as lactose, starch, cellulose derivatives, magnesium stearate, stearic acid, and the like. Similar diluents can be used to make compressed tablets. Tablets and capsules can be manufactured as a sustained release product to provide a continuous release of drug over a period of time. The compressed tablets may be sugar coated or coated with a film to mask any unpleasant taste and to shield the tablet from the atmosphere, or enteric-coated for selective disintegration in the gastrointestinal tract.

Liquid dosage forms for oral administration may contain coloring and flavoring agents to improve patient acceptance.

Generally, water, a suitable oil, saline, hydrated dextrose (glucose), and related sugar solutions and glycols (e.g., propylene glycol or polyethylene glycol) are suitable carriers for parenteral solutions. Solutions for parenteral administration preferably contain water-soluble salts of the active ingredient, suitable stabilizers, and possibly buffer substances. Antioxidants are suitable stabilizers, such as sodium bisulfite, sodium sulfite, or vitamin C, either alone or in combination, or citric acid and its salts and sodium EDTA salts. In addition, parenteral solutions also contain preservatives, such as benzalkonium chloride, methyl-or propyl-parabens, and chlorobutanol.

These and other methods of minimizing contact between the components of the combination product of the invention, whether they are administered in a single dosage form or in separate forms, but at the same time or in the same manner, will be apparent to those skilled in the art once apprised of the present disclosure.

According to a specific embodiment of the invention, Levatinib-3, 5-dihydroxybenzoic acid eutectic (LVB-3,5-DBA) is prepared from Levatinib free base (LVB) and 3, 5-dihydroxybenzoic acid (3,5-DBA), and the molecular structures of the two are as follows:

example 1

The preparation method of the LVB-3,5-DBA eutectic crystal comprises the following steps: 500mg LVB +180mg 3,5-DBA +5ml methanol-dichloromethane (1:1) is stirred for 48 hours and then centrifuged or filtered, separated and dried to obtain the final product.

Characterization of co-crystals by PXRD

The analysis results of the prepared co-crystal and the bulk drug by powder X-ray (PXRD) are shown in fig. 3, and it can be seen from the results that the newly prepared LVB-3,5-DBA co-crystal, the bulk drug Lenvatinib (LVB), and the co-crystal former 3, 5-dihydroxybenzoic acid show significantly different diffraction patterns, indicating that the new co-crystal was successfully prepared.

Characterization of the Co-crystals by DSC

The characterization results of the prepared eutectic powder by Differential Scanning Calorimetry (DSC) with a temperature rise rate of 20 ℃/min and nitrogen as shielding gas are shown in FIG. 4. As can be seen from FIG. 4, the melting point peaks of 3,5-DBA, LVB-3,5-DBA and lenvatinib free base (LVB) are 237 ℃, 216 ℃ and 241 ℃ respectively.

Example 2

Inherent dissolution test of LVB-3,5-DBA and LVB mesylate which is already on the market

The experiment was carried out using an inherent dissolution apparatus (Fukesi Analyzer Co., Ltd., China). The LVB-3,5-DBA or LVB mesylate is physically mixed with water-soluble starch in a weight ratio of 7/3, and then tableted at a pressure of 300kgf for 2min to prepare a tablet dissolution. Intrinsic dissolution conditions: 500ml of 0.1M HCl (0.1% Tween 80) dissolution medium at 300 RPM. The LVB concentration in the supernatant was determined by sampling 1ml at 2,4,6,8,10min, centrifuging at 13000RPM for 2min, and the results are shown in FIG. 5. The results demonstrate that the LVB-3,5-DBA eutectic has a faster intrinsic dissolution rate than the marketed LVB mesylate.

Comparative example 1 eutectic screening

About 20mg of LVB free base and an equimolar amount of the co-crystal former are weighed, stirred for 48 hours with an appropriate amount of an organic solvent (e.g. methanol, methanol/dichloromethane (1:1)), centrifuged, and the precipitate dried at room temperature and measured for X-ray powder diffraction. And judging whether a new crystal form is generated or not according to an X-ray result. Specific experimental results are shown in fig. 6, and nicotinamide, urea, succinic acid, benzoic acid, aspartame, sucralose, acesulfame potassium, mannose and lenvatinib cannot form a eutectic crystal.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (12)

1. A co-crystal consisting of a compound of formula (I) and a compound of formula (II), said co-crystal having an X-ray powder diffraction pattern with diffraction peaks at the following 2 Θ angles: 6.4 degrees +/-0.2 degrees, 8.0 degrees +/-0.2 degrees, 10.3 degrees +/-0.2 degrees, 11.6 degrees +/-0.2 degrees, 12.4 degrees +/-0.2 degrees, 16.0 degrees +/-0.2 degrees, 16.5 degrees +/-0.2 degrees, 19.4 degrees +/-0.2 degrees, 21.7 degrees +/-0.2 degrees, 23.2 degrees +/-0.2 degrees, 25.1 degrees +/-0.2 degrees, 25.7 degrees +/-0.2 degrees,

2. the co-crystal of claim 1, wherein the molar ratio of the compound of formula (I) to the compound of formula (II) is 2: 1.

3. The co-crystal of claim 1, wherein the co-crystal has an X-ray powder diffraction pattern substantially as shown in fig. 1.

4. The co-crystal of claim 1, wherein the differential scanning calorimetry curve of the co-crystal has an endothermic peak at 216 ℃ ± 3 ℃.

5. The co-crystal of claim 4, wherein the co-crystal has a differential scanning calorimetry curve substantially as shown in figure 2.

6. A method for preparing a co-crystal of a compound of formula (I) and a compound of formula (II), comprising:

crystallizing the compound shown in the formula (I) and the compound shown in the formula (II) in a mixed solvent of methanol and dichloromethane so as to obtain a eutectic crystal.

7. The method of claim 6, wherein the molar ratio of the compound of formula (I) to the compound of formula (II) is at most 2: 1;

preferably, the molar ratio of the compound shown in the formula (I) to the compound shown in the formula (II) is 2: 1-2: 6;

preferably, the molar ratio of the compound shown in the formula (I) to the compound shown in the formula (II) is 1: 1;

optionally, the volume ratio of the methanol to the dichloromethane in the methanol/dichloromethane mixed solvent is 1:100-100: 1;

optionally, the volume ratio of methanol to dichloromethane in the methanol/dichloromethane mixed solvent is 1:1, and the molar volume ratio of the compound shown in the formula (II) to the methanol/dichloromethane mixed solvent is at least 0.6mmol:5 mL;

preferably, the molar volume ratio of the compound shown in the formula (II) to the methanol/dichloromethane mixed solvent is 1.17mmol:5 mL;

optionally, the final solid content of the crystalline form in the methanol/dichloromethane mixed solvent is 1-50%.

8. A pharmaceutical composition comprising a co-crystal according to any one of claims 1 to 5 or obtained by a process according to claim 6 or 7.

9. The pharmaceutical composition of claim 8, further comprising a pharmaceutically acceptable carrier, excipient, diluent, adjuvant, vehicle, or combination thereof.

10. Use of the co-crystal according to any one of claims 1 to 5 or the co-crystal prepared by the method according to claim 6 or 7 or the pharmaceutical composition according to claim 8 or 9 for the preparation of a medicament for the prevention and/or treatment of thyroid or liver cancer.

11. Use of the co-crystal of any one of claims 1 to 5 or the co-crystal prepared by the method of claim 6 or 7 or the pharmaceutical composition of claim 8 or 9 for the preparation of a medicament for inhibiting vascular endothelial growth factor receptor, fibroblast growth factor receptor, platelet derived growth factor receptor and proto-oncogene.

12. The use according to claim 11, wherein the vascular endothelial growth factor receptor comprises at least one factor selected from the group consisting of:

VEGFR1, VEGFR2, and VEGFR 3;

optionally, the fibroblast growth factor receptor comprises at least one factor selected from the group consisting of:

FGFR 1, FGFR 2, FGFR 3 and FGFR 4.

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