CN114591265A - Benzothiazole compound, pharmaceutical composition, preparation method and application thereof - Google Patents

Abstract

Benzothiazole compounds, pharmaceutical compositions, preparation methods and applications thereof. The invention provides a compound shown in a formula (I), a preparation method thereof and application thereof in antivirus. The compound can effectively inhibit the activity of HBV virus, provides a solution for treating patients with hepatitis diseases, and can be used for preparing antiviral drugs.

Description

Benzothiazole compound, pharmaceutical composition, preparation method and application thereof

Technical Field

The invention belongs to the technical field of medicinal chemistry, and particularly relates to a benzothiazole compound, and a medicinal composition, a preparation method and application thereof.

Background

Hepatitis B Virus (HBV) is the causative agent of hepatitis b (hepatitis b for short). HBV infection is a global public health problem, and persistent HBV infection can lead to cirrhosis and even liver cancer. Along with the production and investment of genetic engineering vaccines, the popularization rate of hepatitis B vaccines is increased year by year, and the infection rate of hepatitis B is in a descending trend. In China, because the cardinality of hepatitis B virus carriers is large, the prevention and treatment of hepatitis B is still the key point of public health in China at present and even in decades in the future.

Nucleoside analogues and type I interferons these reverse transcriptase inhibitors, while effective in reducing HBV DNA levels and controlling HBV levels in patients, have no direct effect on the clearance of HBeAg and HBsAg due to their target of action being the process of reverse transcription of RNA into DNA. Therefore, the seroconversion probability of HBeAg and HBsAg in the single-drug treatment of the nucleoside analogue is extremely low, hepatitis B cannot be really cured, and patients need to take the drugs for a long time or even for life. The treatment course of the type I interferon is long, the cost is high, the lasting response rate of a patient is only 10-47%, and the treatment effect of the non-specific antiviral treatment on the hepatitis B patient is not ideal.

The hepatitis B vaccine is an effective means for preventing hepatitis B, and the conventional recombinant hepatitis B vaccine is mainly used for specifically preventing HBV infection of newborns and susceptible people. The immunization of the hepatitis B vaccine for the newborn effectively prevents the new HBV infection. Wherein hepatitis B surface antigen (HBsAg) with natural structure is used as target antigen. However, this method can induce the production of antibodies only in uninfected healthy humans, and thus exerts a prophylactic effect, and is a prophylactic vaccine.

The persistent state of chronic HBV infection is mainly due to the immune tolerance of the body to the hepatitis b virus antigen. The immunoprophylactic hepatitis B vaccine is not effective to patients already suffering from chronic HBV infection, and has no treatment effect. If patients with chronic HBV infection are not treated, 25-40% of infected patients will progress to decompensated cirrhosis or liver cancer. Therefore, many scholars all over the world try to eliminate the therapeutic vaccine of chronic HBV infected liver cells by inducing chronic HBV infected persons to generate specific immune response reaction to HBV viral antigen and mobilizing the specific immunity of the organism, and the existing therapeutic hepatitis B vaccine has certain advantages but also has some problems. For example, DNA vaccines induce strong cellular and humoral immune responses and break specific Cytotoxic T Lymphocyte (CTL) tolerance, but the problems of safety (including environmental safety and human safety) and standardization remain to be studied intensively. Polyepitope gene vaccines or polyepitope polypeptide vaccines provide a new idea for multivalent vaccine research, but are limited to patients expressing certain MHC molecules due to the limitations of MHC molecules, and there is also a need to overcome the inherent disadvantages of poor immunogenicity of epitope vaccines. The immunogenicity of the antigen-antibody complex therapeutic vaccines is also limited by the use of conventional aluminum salt adjuvants.

Antiviral treatments are currently marketed mainly by using interferons or nucleoside analogues. Wherein the nucleoside analog inhibits HBV production by inhibiting reverse transcriptase activity during HBV replication. Although the reverse transcriptase inhibitor can control the level of hepatitis B virus of a patient, the reverse transcriptase inhibitor is high in cost and lacks targeting property, most of the reverse transcriptase inhibitor is discharged through the kidney after being taken, only a few parts of the reverse transcriptase inhibitor are absorbed by liver organs, and the treatment effect is poor.

Disclosure of Invention

In order to improve the technical problems, the invention provides a compound shown as a formula (I), a racemate, a stereoisomer, a tautomer, an isotopic marker, a solvate, a polymorphic substance or pharmaceutically acceptable salts thereof;

wherein R is₁Selected from H, C unsubstituted or optionally substituted by one, two or more Ra_1-12Alkyl radical, C_1-12An alkoxy group;

R₂selected from C unsubstituted or optionally substituted by one, two or more Rb_1-12Alkyl radical, C_6-14Aryl, 5-14A membered heteroaryl group;

R₃selected from C unsubstituted or optionally substituted by one, two or more Rc_1-12Alkyl radical, C_1-12Alkoxy, 3-12 membered heterocyclyl, 5-14 membered heteroaryl;

each Ra, Rb, Rc, which are identical or different, are independently selected from halogen, C_1-12Alkyl radical, C_1-12Alkoxy radical, C_6-14Aryl, 5-14 membered heteroaryl, 3-12 membered heterocyclyl.

According to an embodiment of the invention, R₁Can be selected from H, C_1-6An alkoxy group;

R₂may be selected from C_6-10aryl-C_1-6Alkyl radical, C_1-6alkyl-C_6-10An aryl group;

R₃may be selected from halogeno C_1-6Alkoxy, 3-8 membered heterocyclyl, 5-10 membered heteroaryl.

According to an embodiment of the invention, R₁Can be selected from H, C_1-3An alkoxy group;

R₂may be selected from C_6-8aryl-C_1-3Alkyl radical, C_1-3alkyl-C_6-8An aryl group;

R₃may be selected from halogen C_1-3Alkoxy, 3-6 membered heterocyclyl, 5-6 membered heteroaryl.

According to an embodiment of the invention, R₁May be selected from H, methoxy;

R₂may be selected from benzyl, 4-isopropylphenyl;

R₃may be selected from furyl, CF₃CH₂O-。

According to an embodiment of the invention, the compound of formula (I) is selected from the following structures:

the invention also provides a pharmaceutical composition, which comprises at least one of a therapeutically effective amount of a compound shown in formula (I), racemate, stereoisomer, tautomer, isotopic marker, solvate, polymorph or pharmaceutically acceptable salt thereof.

According to an embodiment of the invention, the pharmaceutical composition is formulated for administration by a route selected from the group consisting of: oral, injection, rectal, nasal, pulmonary, topical, buccal and sublingual, vaginal, parenteral, subcutaneous, intramuscular, intravenous, intradermal, intrathecal and epidural.

According to an embodiment of the invention, the pharmaceutical composition is preferably administered orally.

The oral dosage form is not particularly limited, and any oral dosage form known in the art may be used, and preferably, oral dosage forms known in the art including tablets, capsules, suspensions, or oral solutions are included. For oral administration, the dosage standard is, for example, 500-1500 mg/day, preferably 700-1200 mg/day, more preferably 800-1000 mg/day, and most preferably 1000 mg/day.

The time of administration of the pharmaceutical composition according to the invention may depend on the extent of the disease, preferably at least 1 month, for example, it may be 1,2,3, 4, 5 or 6 months, and may be up to lifelong due to the needs of the disease.

According to an embodiment of the present invention, the pharmaceutical composition may further comprise a pharmaceutically acceptable excipient selected from at least one of the following excipients, including but not limited to: fillers, disintegrants, binders, lubricants, surfactants, flavoring agents, wetting agents, pH adjusting agents, solubilizers or cosolvents, and osmotic pressure adjusting agents. The skilled person can easily determine how to select the corresponding excipients and the corresponding amounts thereof according to the needs of a particular dosage form.

According to an embodiment of the invention, the pharmaceutical composition may further comprise one or more additional therapeutic agents. The invention also provides at least one of the compound shown in the formula (I), racemate, stereoisomer, tautomer, isotopic marker, solvate, polymorph or pharmaceutically acceptable salt thereof, and application of the pharmaceutical composition in preparing medicines.

According to an embodiment of the present invention, the medicament is a medicament for treating or preventing viral hepatitis.

According to an embodiment of the invention, the viral hepatitis comprises hepatitis b or hepatitis d.

The invention also provides a compound shown in the formula (I), a racemate, a stereoisomer, a tautomer, an isotopic marker, a solvate, a polymorph or pharmaceutically acceptable salts thereof, and application of the pharmaceutical composition in preventing and/or treating viral hepatitis.

The invention also provides a method for preventing or treating viral hepatitis, which comprises the step of administering at least one of a compound shown as a formula (I), racemate, stereoisomer, tautomer, isotopic marker, solvate, polymorphic substance or pharmaceutically acceptable salt thereof to a patient in a preventive or therapeutic effective amount, or administering the pharmaceutical composition to the patient in a preventive or therapeutic effective amount.

According to an embodiment of the invention, the viral hepatitis comprises hepatitis b or hepatitis d.

In some embodiments, the patient is a mammal, preferably a human.

Advantageous effects

The compound shown in the formula (I) has obvious inhibition effect on hepatitis B surface antigen (HBsAg) and hepatitis B e antigen (HBeAg), and has the capability of reducing the load of Hepatitis B Virus (HBV), HBsAg and/or HBeAg level in cell tests and animal tests, so that the effect of eliminating hepatitis B virus is expected to be achieved, and the hepatitis B is cured.

Drawings

FIG. 1 is a graph showing the cell activity of the compound of the present invention in test example 1.

FIG. 2 is a graph showing the HBeAg inhibition rate of the compound of the present invention in test example 1.

FIG. 3 is a graph showing the HBsAg inhibition ratio of the compound of the present invention in test example 1.

Definition and description of terms

Unless otherwise indicated, the definitions of groups and terms described in the specification and claims of the present application, including definitions thereof as examples, exemplary definitions, preferred definitions, definitions described in tables, definitions of specific compounds in the examples, and the like, may be arbitrarily combined and coupled with each other. Such combinations and definitions of groups and structures of compounds after combination are to be understood as being within the scope of the present description and/or claims.

Unless otherwise indicated, the numerical ranges set forth in the specification and claims are equivalent to at least each and every specific integer numerical value set forth therein. For example, a numerical range of "1 to 12" is equivalent to reciting each of the integer values in the numerical range of "1 to 12", i.e., 1,2,3, 4, 5,6, 7, 8, 9, 10, 11, 12. Further, when certain numerical ranges are defined as "numbers," it should be understood that the two endpoints of the range, each integer within the range, and each decimal within the range are recited. For example, "a number of 0 to 10" should be understood to not only recite each integer of 0, 1,2,3, 4, 5,6, 7, 8, 9, and 10, but also to recite at least the sum of each integer and 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, respectively.

It should be understood that in describing one, two or more herein, "more" shall mean an integer greater than 2, such as greater than or equal to 3, for example, 3,4, 5,6, 7, 8, 9, or 10.

The term "halogen" denotes fluorine, chlorine, bromine and iodine.

The term "C_1-12Alkyl "is understood to mean a straight-chain or branched saturated monovalent hydrocarbon radical having from 1 to 12 carbon atoms. For example, "C_1-10Alkyl "denotes straight-chain and branched alkyl groups having 1,2,3, 4, 5,6, 7, 8, 9 or 10 carbon atoms," C_1-8Alkyl "denotes straight and branched chain alkyl groups having 1,2,3, 4, 5,6, 7, or 8 carbon atoms," C_1-6Alkyl "denotes straight-chain and branched alkyl groups having 1,2,3, 4, 5 or 6 carbon atoms. The alkyl group is, for example, methyl, ethyl, propyl, butyl, pentyl, hexyl, isopropyl, isobutyl, sec-butyl, tert-butyl, isopentyl, 2-methylbutyl, 1-ethylpropyl, 1, 2-dimethylpropyl, neopentyl, 1-dimethylpropyl4-methylpentyl group, 3-methylpentyl group, 2-methylpentyl group, 1-methylpentyl group, 2-ethylbutyl group, 1-ethylbutyl group, 3-dimethylbutyl group, 2-dimethylbutyl group, 1-dimethylbutyl group, 2, 3-dimethylbutyl group, 1, 3-dimethylbutyl group or 1, 2-dimethylbutyl group, and the like, or isomers thereof.

The term "3-12 membered heterocyclyl" refers to a saturated or unsaturated non-aromatic ring or ring system, for example, which is a 4-, 5-, 6-or 7-membered monocyclic, 7-, 8-, 9-, 10-, 11-or 12-membered bicyclic (e.g., fused, bridged, spiro) or tricyclic ring system, and contains at least one, for example, 1,2,3, 4, 5 or more heteroatoms selected from O, S and N, wherein N and S may also be optionally oxidized to various oxidation states to form nitroxides, -S (O) -or-S (O)₂-state of (c). Preferably, the heterocyclic group may be selected from "3-10 membered heterocyclic group". The term "3-10 membered heterocyclyl" means a saturated or unsaturated non-aromatic ring or ring system and contains at least one heteroatom selected from O, S and N. The heterocyclic group may be attached to the rest of the molecule through any of the carbon atoms or nitrogen atom (if present). The heterocyclic group may include fused or bridged rings as well as spiro rings. In particular, the heterocyclic group may include, but is not limited to: 4-membered rings such as azetidinyl, oxetanyl; 5-membered rings such as tetrahydrofuranyl, dioxolyl, pyrrolidinyl, imidazolidinyl, pyrazolidinyl, pyrrolinyl; or a 6-membered ring such as tetrahydropyranyl, piperidinyl, morpholinyl, dithianyl, thiomorpholinyl, piperazinyl or trithianyl; or a 7-membered ring such as diazepanyl. Optionally, the heterocyclic group may be benzo-fused. The heterocyclyl group may be bicyclic, for example but not limited to a 5,5 membered ring, such as hexahydrocyclopenta [ c ]]Pyrrole-2 (1H) -cyclic rings, or 5,6 membered bicyclic rings, e.g. hexahydropyrrolo [1,2-a ]]A pyrazin-2 (1H) -yl ring. The heterocyclyl group may be partially unsaturated, i.e. it may contain one or more double bonds, such as, but not limited to, dihydrofuranyl, dihydropyranyl, 2, 5-dihydro-1H-pyrrolyl, 4H- [1,3,4]Thiadiazinyl, 1,2,3, 5-tetrahydrooxazolyl or 4H- [1,4 [ ]]Thiazinyl, or it may be benzo-fused, such as but not limited to dihydroisoquineA quinoline group. When the 3-12 membered heterocyclic group is linked to another group to form the compound of the present invention, the carbon atom of the 3-12 membered heterocyclic group may be linked to another group, or the heterocyclic atom of the 3-12 membered heterocyclic ring may be linked to another group. For example, when the 3-12 membered heterocyclic group is selected from piperazinyl, it may be such that the nitrogen atom on the piperazinyl group is attached to another group. Or when the 3-12 membered heterocyclyl group is selected from piperidinyl, it may be that the nitrogen atom on the piperidinyl ring and the carbon atom in the para position are attached to other groups.

The term "C_6-14Aryl "is to be understood as preferably meaning a mono-, bi-or tricyclic hydrocarbon ring having a monovalent or partially aromatic character with 6, 7, 8, 9, 10, 11, 12, 13 or 14 carbon atoms (" C_6-14Aryl group "), in particular a ring having 6 carbon atoms (" C₆Aryl "), such as phenyl; or biphenyl, or is a ring having 9 carbon atoms ("C₉Aryl), such as indanyl or indenyl, or a ring having 10 carbon atoms ("C₁₀Aryl radicals), such as tetralinyl, dihydronaphthyl or naphthyl, or rings having 13 carbon atoms ("C₁₃Aryl radicals), such as the fluorenyl radical, or a ring having 14 carbon atoms ("C)₁₄Aryl), such as anthracyl. When said C is_6-14When the aryl group is substituted, it may be mono-or polysubstituted. And, the substitution site thereof is not limited, and may be, for example, ortho-, para-or meta-substitution.

The term "5-14 membered heteroaryl" is understood to include such monovalent monocyclic, bicyclic or tricyclic aromatic ring systems: which has 5,6, 7, 8, 9, 10, 11, 12, 13 or 14 ring atoms, in particular 5 or 6 or 9 or 10 carbon atoms, and which comprises 1 to 5, preferably 1 to 3, heteroatoms each independently selected from N, O and S and, in addition, can be benzo-fused in each case. "heteroaryl" also refers to a group in which a heteroaromatic ring is fused to one or more aryl, alicyclic, or heterocyclic rings, wherein the radical or point of attachment is on the heteroaromatic ring. When the 5-14 membered heteroaryl is linked to another group to form a compound of the present invention, the carbon atom on the 5-14 membered heteroaryl ring may be linked to another group, or the heteroatom on the 5-14 membered heteroaryl ring may be linked to another group. When the 5-14 membered heteroaryl group is substituted, it may be mono-or poly-substituted. Also, there is no limitation on the substitution site thereof, and for example, hydrogen attached to a carbon atom on a heteroaryl ring may be substituted, or hydrogen attached to a heteroatom on a heteroaryl ring may be substituted.

The term "spiro" refers to a ring system in which two rings share 1 ring atom.

The term "fused ring" refers to a ring system in which two rings share 2 ring atoms.

The term "bridged ring" refers to a ring system in which two rings share more than 3 ring-forming atoms.

Unless otherwise indicated, heterocyclyl, heteroaryl or heteroarylene include all possible isomeric forms thereof, e.g., positional isomers thereof. Thus, for some illustrative non-limiting examples, forms may be included that are substituted at 1,2 or more of their 1-, 2-, 3-, 4-, 5-, 6-, 7-, 8-, 9-, 10-, 11-, 12-positions, etc. (if present) or bonded to other groups, including pyridin-2-yl, pyridin-3-yl, pyridin-4-yl, and pyridin-4-yl; thienyl or thienylene includes thien-2-yl, thien-3-yl and thien-3-yl; pyrazol-1-yl, pyrazol-3-yl, pyrazol-4-yl, and pyrazol-5-yl.

As used herein, the term "pharmaceutically acceptable salt" refers to a salt made from a pharmaceutically acceptable non-toxic acid (including inorganic or organic acids). The compounds of the invention may be mono-, di-or tri-salts depending on the number of acidic functional groups present in the free base form of the compound. By way of example, the acids include acetic acid, trifluoroacetic acid, benzenesulfonic acid, benzoic acid, camphorsulfonic acid, citric acid, ethanesulfonic acid, fumaric acid, glucose, glutamic acid, hydrobromic acid, hydrochloric acid, isethionic acid, lactic acid, maleic acid, malic acid, mandelic acid, methanesulfonic acid, mucic acid, nitric acid, pamoic acid, pantothenic acid, phosphoric acid, succinic acid, sulfuric acid, oxalic acid, tartaric acid, p-toluenesulfonic acid and the like.

Viral hepatitis

The etiological typing of viral hepatitis is currently recognized by five hepatitis viruses, namely hepatitis A virus, hepatitis B virus, hepatitis C virus, hepatitis D virus and hepatitis E virus, which are respectively written as HAV, HBV, HCV, HDV and HEV, and the rest are RNA viruses except the hepatitis B virus which is a DNA virus.

Hepatitis b is an infectious disease mainly caused by hepatitis b virus, and is a liver disease. Clinically, the symptoms of anorexia, nausea, epigastric discomfort, liver pain and hypodynamia are mainly manifested. Some patients may have jaundice fever and hepatomegaly with impaired liver function. Some patients can become chronic, even develop cirrhosis of the liver, and a few can develop liver cancer.

The etiological agent of hepatitis b is Hepatitis B Virus (HBV), a DNA virus whose genome is a double-stranded, circular, incompletely closed DNA. The outermost layer of the virus is the outer membrane or coat of the virus, the inner layer is the core, and the nucleoprotein is the core antigen (HBcAg) and cannot be detected in serum. Serum from HBsAg positive patients was observed under electron microscope to show 3 kinds of particles, circular and filamentous particles with a diameter of 22nm, and less spherical particles with a diameter of 42 angstroms, also called Dane's particles, as complete HBV particles.

Marker detection of hepatitis b is as follows: (ii) HBsAg and anti-HBs: HBsAg positive indicates that HBV is currently in the stage of infection, and anti-HBs positive for immunoprotective antibodies indicates that immunity to HBV has developed. The diagnosis basis of the chronic HBsAg carrier is that the chronic HBsAg carrier has no clinical symptoms and physical signs, the liver function is normal, and the HBsAg is continuously positive for more than 6 months. (vii) HBeAg and anti-HBe: HBeAg positivity is an index of HBV active replication and strong infectivity, and the change of the detected serum from HBeAg positivity to anti-HBe positivity indicates that the disease has remission and weakened infectivity. ③ HBcAg and anti-HBc: HBcAg positive suggests that there is a direct reaction of complete HBV particles, and active replication of HBV is less clinically useful due to the complex detection method. anti-HBc is a marker of HBV infection, and anti-HBc IgM positive indicates that the virus is replicated in vivo at an early stage of infection. HBsAg, HBeAg and anti-HBc are all positive in chronic mild hepatitis B and HBsAg carriers, and have high infectivity index and are difficult to convert from negative to positive.

As used herein, "an individual in need thereof" includes individuals infected with/carrying hepatitis B virus or hepatitis D virus, particularly patients suffering from acute, chronic, severe hepatitis or post-hepatitis cirrhosis, carriers of hepatitis B surface antigen, and patients infected with hepatitis D, and the like.

As used herein, a "therapeutically effective amount" or "effective amount" refers to an amount that is effective at a dose and for a period of time required to achieve the desired therapeutic result. The therapeutically effective amount of the pharmaceutical composition will depend on the nature of the disease or condition and the particular drug, and can be determined by standard clinical techniques known to those skilled in the art.

Treatment outcomes may include alleviation of symptoms, prolongation of survival, increased mobility, and the like. The therapeutic result is not necessarily a "(complete) cure". The therapeutic outcome may also be prophylactic.

The medicament or pharmaceutical composition of the present application is administered by any route suitable for the disease to be treated. Suitable routes include oral, rectal, nasal, pulmonary, topical (including buccal and sublingual), vaginal and parenteral (including subcutaneous, intramuscular, intravenous, intradermal, intrathecal and epidural) and the like. It will be appreciated that the preferred route may vary depending on, for example, the condition of the recipient. One advantage of the medicaments or pharmaceutical compositions according to the invention is that they are orally bioavailable and can be administered orally.

In a preferred embodiment, the pharmaceutical composition is formulated for administration by a route selected from the group consisting of: oral, rectal, nasal, pulmonary, topical, buccal and sublingual, vaginal, parenteral, subcutaneous, intramuscular, intravenous, intradermal, intrathecal and epidural.

In a preferred embodiment, the composition is formulated for oral administration, preferably in the form of a tablet or capsule.

The pharmaceutical compositions according to the invention may be formulated with conventional carriers and excipients, which will be selected in accordance with common practice. Tablets will contain excipients, glidants, fillers, binders and the like. Aqueous formulations are prepared in sterile form and, when used for delivery by non-oral administration, are generally isotonic. All formulations will optionally contain Excipients such as those described in the Handbook of Pharmaceutical Excipients (1986). Excipients include ascorbic acid and other antioxidants, chelating agents such as EDTA, carbohydrates such as dextran, hydroxyalkyl cellulose, hydroxyalkyl methyl cellulose, stearic acid, and the like. The pH of the formulation ranges from about 3 to about 11, but is typically from about 7 to 10. In some embodiments, the pH of the formulation ranges from about 2 to about 5, but typically from about 3 to 4.

The formulations include those suitable for the aforementioned routes of administration. The formulations may conveniently be presented in unit dosage form and may be prepared by any of the methods well known in the art of pharmacy. Techniques and formulations are commonly found in Remington's pharmaceutical Sciences (Mack Publishing co., Easton, PA). Such methods include the step of bringing into association the active ingredient with the carrier which is composed of one or more accessory ingredients. In general, the formulations are prepared by uniformly and intimately bringing into association the active ingredient with liquid carriers or finely divided solid carriers or both, and then shaping the product as necessary.

Formulations of the present application suitable for oral administration may exist as follows: discrete units, such as capsules or tablets, each containing a predetermined amount of active ingredient; a powder or granules; solutions or suspensions in aqueous or non-aqueous liquids; or an oil-in-water liquid emulsion or a water-in-oil liquid emulsion.

Tablets are made by compression or molding, optionally with one or more accessory ingredients. Compressed tablets may be prepared by: the active ingredient in a free-flowing form such as a powder or granules is compressed in a suitable machine, optionally mixed with a binder, lubricant, inert diluent, preservative, surfactant or dispersant. Molded tablets may be prepared by molding in a suitable machine a mixture of the powdered active ingredient moistened with an inert liquid diluent. The tablets may optionally be coated or scored and optionally formulated so as to provide sustained or controlled release of the active ingredient from the tablet.

Formulations for oral use may also be presented as hard gelatin capsules wherein the active ingredient is mixed with an inert solid diluent, for example, calcium phosphate or kaolin, or as soft gelatin capsules wherein the active ingredient is mixed with water or an oil medium, for example peanut oil, liquid paraffin, or olive oil.

Detailed Description

The technical solution of the present invention will be further described in detail with reference to specific embodiments. It is to be understood that the following examples are only illustrative and explanatory of the present invention and should not be construed as limiting the scope of the present invention. All the technologies realized based on the above-mentioned contents of the present invention are covered in the protection scope of the present invention.

Unless otherwise indicated, the raw materials and reagents used in the following examples are all commercially available products or can be prepared by known methods.

EXAMPLE 1 preparation of Compound CP57

Compound CP57 was prepared according to the following scheme

EXAMPLE 2 preparation of Compound CP59

Compound CP59 was prepared according to the following scheme

Test example 1 in vitro anti-HBV Activity test

1. Experimental protocol

Plating cells and compound treatment

On day 0, HepG2.2.15 was plated into 96-well plates (6X 10)⁴Individual cells/well).

On day 1, compound-containing medium was added. Test compounds were diluted at 3 single drug concentrations (table 1), test compounds were tested at 3 concentrations, and control compound ETV was used at 8 concentrations, 3-fold dilution, triplicate wells. Cells were in 5% CO₂And cultured at 37 ℃ for 3 days.

On day 4, fresh medium containing compound was replaced once.

On day 7, the supernatant was collected, and the collected cell supernatant was assayed for HBeAg and HBsAg by ELISA. Meanwhile, CellTiter-Glo detects cell viability, and the collected cells are frozen and stored (for later use).

TABLE 2 test concentrations (μ M) of test compounds

Sample detection

Detecting the content of HBeAg and HBsAg in cell culture supernatant by an ELISA method:

the method refers to the kit specification, and the method is briefly described as follows: respectively taking 50 mu l of standard substance, sample and reference substance, adding 50 mu l of enzyme conjugate into each hole, incubating for 60 minutes at 37 ℃, washing the plate with washing liquor, sucking dry, adding 50 mu l of premixed luminescent substrate, incubating for 10 minutes at room temperature in a dark place, and finally measuring the luminescent value by an enzyme-linked immunosorbent assay.

CellTiter-Glo cell viability assay:

cell viability was determined with reference to CellTiter-Glo kit instructions, the method is briefly as follows: after collecting the cell culture supernatant, CellTiter-Glo (medium 1:1 dilution) was added to each well, incubated at room temperature for 10 minutes, and the luminescence was measured with a microplate reader.

Data analysis

HBeAg inhibition (%) was (1-HBeAg value of sample/DMSO control HBeAg value). times.100%

HBsAg inhibition (%) as (1-HBsAg value of sample/DMSO control HBsAg value). times.100%

Cell activity (%) - (value of sample of compound group-average of blank group)/(average of DMSO group-average of blank group) × 100%

EC was calculated using GraphPad Prism software (four parameter logistic equations)₅₀The value is obtained.

The activity of the compound of the invention (CP57) is shown in table 1 below:

TABLE 1

As shown in Table 1, the compound of the present invention has low cytotoxicity and high HBsAg and HBeAg inhibiting rate, and is a potential drug for treating viral hepatitis.

The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A compound of formula (I), racemates, stereoisomers, tautomers, isotopic labels, solvates, polymorphs thereof, or pharmaceutically acceptable salts thereof;

wherein R is₁Selected from H, C unsubstituted or optionally substituted by one, two or more Ra_1-12Alkyl radical, C_1-12An alkoxy group;

R₂selected from C unsubstituted or optionally substituted by one, two or more Rb_1-12Alkyl radical, C_6-14Aryl, 5-14 membered heteroaryl;

R₃selected from C unsubstituted or optionally substituted by one, two or more Rc_1-12Alkyl radical, C_1-12Alkoxy, 3-12 membered heterocyclyl, 5-14 membered heteroaryl;

each Ra, Rb, Rc, which are identical or different, are independently of one another selected from halogen, C_1-12Alkyl radical, C_1-12Alkoxy radical, C_6-14Aryl, 5-14 membered heteroaryl, 3-12 membered heterocyclyl.

2. The compound of claim 1, characterized in that，R₁Selected from H, C_1-6An alkoxy group;

R₂is selected from C_6-10aryl-C_1-6Alkyl radical, C_1-6alkyl-C_6-10An aryl group;

R₃selected from halogen C_1-6Alkoxy, 3-8 membered heterocyclyl, 5-10 membered heteroaryl.

3. A compound according to claim 1 or 2, wherein R is₁Selected from H, C_1-3An alkoxy group;

R₂is selected from C_6-8aryl-C_1-3Alkyl radical, C_1-3alkyl-C_6-8An aryl group;

R₃selected from halogen C_1-3Alkoxy, 3-6 membered heterocyclyl, 5-6 membered heteroaryl.

4. A compound according to any one of claims 1 to 3, wherein R is₁Selected from H, methoxy;

R₂selected from benzyl, 4-isopropylphenyl;

R₃selected from furyl, CF₃CH₂O-。

5. The compound of any one of claims 1-4, wherein the compound is selected from the structures:

6. a pharmaceutical composition comprising a therapeutically effective amount of at least one compound of any one of claims 1-5, racemates, stereoisomers, tautomers, isotopic labels, solvates, polymorphs thereof, or pharmaceutically acceptable salts thereof.

7. At least one compound of any one of claims 1 to 5, racemates, stereoisomers, tautomers, isotopic labels, solvates, polymorphs thereof, or pharmaceutically acceptable salts thereof, and the use of said pharmaceutical compositions for the manufacture of medicaments.

8. The use of claim 7, wherein the medicament is a medicament for treating or preventing viral hepatitis.

9. The use of claim 8, wherein said viral hepatitis comprises hepatitis B or hepatitis D.

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