WO2020147842A1 - 吡啶并嘧啶类化合物在制备治疗鼻咽癌药物中的应用 - Google Patents
吡啶并嘧啶类化合物在制备治疗鼻咽癌药物中的应用 Download PDFInfo
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- WO2020147842A1 WO2020147842A1 PCT/CN2020/072792 CN2020072792W WO2020147842A1 WO 2020147842 A1 WO2020147842 A1 WO 2020147842A1 CN 2020072792 W CN2020072792 W CN 2020072792W WO 2020147842 A1 WO2020147842 A1 WO 2020147842A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/33—Heterocyclic compounds
- A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
- A61K31/535—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with at least one nitrogen and one oxygen as the ring hetero atoms, e.g. 1,2-oxazines
- A61K31/5375—1,4-Oxazines, e.g. morpholine
- A61K31/5386—1,4-Oxazines, e.g. morpholine spiro-condensed or forming part of bridged ring systems
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
Definitions
- the invention relates to the application of a class of pyridopyrimidine compounds in the preparation of drugs for treating nasopharyngeal carcinoma. Specifically, it relates to the application of a compound represented by formula (I) or a pharmaceutically acceptable salt thereof in the preparation of a medicine for treating nasopharyngeal carcinoma.
- the present invention relates to a signal pathway that plays a key role in tumor proliferation, invasion and metastasis and anti-apoptosis, that is, phosphatidylinositol 3-kinase (PI3K)-AKT-mTOR signal pathway of mammalian rapamycin protease.
- PI3K phosphatidylinositol 3-kinase
- PI3K vascular endothelial growth factor
- HGF human growth factor
- Ang1 angiogenic protein I
- FGF fibroblast growth factor
- VEGF vascular endothelial growth factor
- HGF human growth factor
- Ang1 angiogenic protein I
- RTK receptor tyrosine kinase
- PIP3 binds to the signal protein AKT and PDK1 (phosphoinositide dependent kinase-1) containing the PH domain in the cell, and promotes the phosphorylation of Ser308 of the AKT protein by PDK1 to activate AKT.
- Other PDK1 substrates also include PKC (protein kinase C), S6K (p70S6) and SGK (serum/glucocorticoid regulated kinases).
- AKT also known as protein kinase B (PKB)
- PKT protein kinase B
- Activated AKT phosphorylates downstream factors such as a variety of enzymes, kinases and transcription factors, thereby regulating cell functions.
- AKT phosphorylates target proteins through various downstream pathways to exert anti-apoptotic effects.
- PTEN phosphatase and tensin homology deleted on chromosome 10
- PTEN is a tumor suppressor gene, gene mutation or deletion occurs in a wide range of human tumors.
- PTEN is a PIP3-phosphatase, contrary to the function of PI3K, it can convert PIP3 to PIP2 by dephosphorylation.
- PTEN can reduce the activation of AKT and prevent all downstream signaling events regulated by AKT.
- mTOR is relatively conservative in evolution.
- mTOR phosphorylates the downstream target protein S40S ribosomal S6 Protein kinases, such as S6K1 and 4EBP1, regulate downstream protein translation.
- mTOR binds to eIF3, phosphorylates S6K1, and then releases S6K1 from eIF3 to be activated, and further phosphorylates cell substrates, such as p70S6 to promote protein translation and expression.
- 4EBP1 binds to the eukaryotic transcription initiation factor 4E and inhibits its activity. When mtor phosphorylates 4E-BP1, it activates and separates it from eif-4e to realize eukaryotic transcription.
- mTORC2 can phosphorylate AKT, thereby up-regulating its kinase activity.
- this signaling pathway is used in a variety of solid tumors, such as nasopharyngeal cancer, breast cancer, prostate cancer, lung cancer, colon cancer, pancreatic cancer, liver cancer, gastric cancer, colorectal cancer, kidney cancer, thyroid cancer, meningitis cancer and acute cancer. Chronic lymphocytic leukemia, Merkel cell tumor, etc. And it is closely related to treatment tolerance and poor prognosis. It can be seen that the development of fine molecular compounds to achieve inhibition of the PI3K/AKT/MTOR signaling pathway has a good development prospect.
- the purpose of the present invention is to discover a double mTOR small molecule compound targeted drug, which has good activity and exhibits excellent effects and functions.
- US20170281637 discloses compound AZD2014, which belongs to mTORC1&mTORC2 kinase inhibitor, and its structural formula is as follows:
- the present invention provides the use of a compound represented by formula (I) or a pharmaceutically acceptable salt thereof in the preparation of a medicine for treating nasopharyngeal carcinoma,
- R 1 is selected C 1-3 alkyl, said C 1-3 alkyl optionally substituted with 1, 2 or 3 R a;
- R 2 is selected from C 1-3 alkyl, said C 1-3 alkyl optionally substituted with 1, 2 or 3 R b;
- R 3 is selected from H and C 1-3 alkyl, the C 1-3 alkyl is optionally substituted with 1, 2 or 3 R c ;
- R 4 is selected from H, F, Cl, Br, I and C 1-3 alkyl, the C 1-3 alkyl is optionally substituted with 1, 2 or 3 R d ;
- R a, R b, R c and R d are each independently selected from H, F, Cl, Br and I.
- the aforementioned R 1 is selected from CH 3 , CF 3 , CH 2 CH 3 , CF 2 CH 3 , CHFCH 2 F, and CF 2 CH 2 F, and other variables are as defined in the present invention.
- R 1 is selected from CH 3 , and other variables are as defined in the present invention.
- the aforementioned R 2 is selected from CH 3 , CF 3 , CH 2 CH 3 , CF 2 CH 3 , CHFCH 2 F, and CF 2 CH 2 F, and other variables are as defined in the present invention.
- R 2 is selected from CH 3 , and other variables are as defined in the present invention.
- R 3 is selected from CH 3 , CF 3 , CH 2 CH 3 , CF 2 CH 3 , CHFCH 2 F, and CF 2 CH 2 F, and other variables are as defined in the present invention.
- R 3 is selected from CH 3 , and other variables are as defined in the present invention.
- R 4 is independently selected from H, F, Cl, Br, I, CH 3 , CF 3 , CH 2 CH 3 , CF 2 CH 3 , CHFCH 2 F, and CF 2 CH 2 F , Other variables are as defined in the present invention.
- R 4 is independently selected from H and F, and other variables are as defined in the present invention.
- the present invention also provides the use of the compound represented by the following formula or a pharmaceutically acceptable salt thereof in the preparation of a medicine for treating nasopharyngeal cancer,
- the compounds of the present invention have significant or unexpected mTOR kinase inhibitory activity.
- the compound of the present invention has obvious proliferation inhibitory activity on MCF-7, N87 and OE-21 cells, and a certain proliferation inhibitory activity on HT-29 cells.
- Compound 1 showed the same or even better pharmacokinetic properties as the reference compound.
- the efficacy of the patented compound in the subcutaneous xenograft tumor model of human nasopharyngeal carcinoma C666-1 cells was evaluated in vivo. Compared with the solvent control group, the 30 mg/kg of the treatment group of Example 2 is equivalent to the reference compound AZD2014 15 mg/kg, and both exhibited significant tumor inhibition effects.
- pharmaceutically acceptable salt refers to a salt of the compound of the present invention, which is prepared from a compound with specific substituents discovered in the present invention and a relatively non-toxic acid or base.
- the base addition salt can be obtained by contacting the neutral form of the compound with a sufficient amount of base in a pure solution or a suitable inert solvent.
- Pharmaceutically acceptable base addition salts include sodium, potassium, calcium, ammonium, organic ammonia or magnesium salt or similar salts.
- the acid addition salt can be obtained by contacting the neutral form of the compound with a sufficient amount of acid in a pure solution or a suitable inert solvent.
- Examples of pharmaceutically acceptable acid addition salts include inorganic acid salts including, for example, hydrochloric acid, hydrobromic acid, nitric acid, carbonic acid, hydrogen carbonate, phosphoric acid, monohydrogen phosphate, dihydrogen phosphate, sulfuric acid, Hydrogen sulfate, hydroiodic acid, phosphorous acid, etc.; and organic acid salts, the organic acids include such as acetic acid, propionic acid, isobutyric acid, maleic acid, malonic acid, benzoic acid, succinic acid, suberic acid, Similar acids such as fumaric acid, lactic acid, mandelic acid, phthalic acid, benzenesulfonic acid, p-toluenesulfonic acid, citric acid, tartaric acid and methanesulfonic acid; also include salts of amino acids (such as arginine, etc.) , And salts of organic acids such as glucuronic acid. Certain specific compounds of the present invention contain basic and acidic
- the pharmaceutically acceptable salt of the present invention can be synthesized from the parent compound containing an acid radical or a base by conventional chemical methods. Generally, such salts are prepared by reacting these compounds in free acid or base form with a stoichiometric amount of appropriate base or acid in water or an organic solvent or a mixture of both.
- the compounds of the present invention may exist in specific geometric or stereoisomeric forms.
- the present invention contemplates all such compounds, including cis and trans isomers, (-)- and (+)-enantiomers, (R)- and (S)-enantiomers, and diastereomers Conformers, (D)-isomers, (L)-isomers, and their racemic mixtures and other mixtures, such as enantiomers or diastereomeric enriched mixtures, all of these mixtures belong to Within the scope of the present invention. Additional asymmetric carbon atoms may be present in substituents such as alkyl groups. All these isomers and their mixtures are included in the scope of the present invention.
- enantiomer or “optical isomer” refers to stereoisomers that are mirror images of each other.
- cis-trans isomer or “geometric isomer” is caused by the inability to rotate freely because of double bonds or single bonds of ring-forming carbon atoms.
- diastereomer refers to a stereoisomer in which a molecule has two or more chiral centers and the relationship between the molecules is not mirror images.
- wedge-shaped solid line keys And wedge-shaped dashed key Represents the absolute configuration of a three-dimensional center, with a straight solid line key And straight dashed key Indicates the relative configuration of the three-dimensional center, using wavy lines Represents a wedge-shaped solid line key Or wedge-shaped dotted key Or use wavy lines Represents a straight solid line key And straight dashed key
- the compound of the present invention may be specific.
- tautomer or “tautomeric form” means that at room temperature, the isomers of different functional groups are in dynamic equilibrium and can be transformed into each other quickly. If tautomers are possible (such as in solution), the chemical equilibrium of tautomers can be reached.
- proton tautomer also called prototropic tautomer
- proton migration such as keto-enol isomerization and imine-ene Amine isomerization.
- Valence isomers include some recombination of bonding electrons to carry out mutual transformation.
- keto-enol tautomerization is the tautomerization between two tautomers of pentane-2,4-dione and 4-hydroxypent-3-en-2-one.
- optically active (R)- and (S)-isomers and D and L isomers can be prepared by chiral synthesis or chiral reagents or other conventional techniques. If you want to obtain an enantiomer of a compound of the present invention, it can be prepared by asymmetric synthesis or derivatization with chiral auxiliary agents, in which the resulting diastereomeric mixture is separated, and the auxiliary group is cleaved to provide pure The desired enantiomer.
- the molecule when the molecule contains a basic functional group (such as an amino group) or an acidic functional group (such as a carboxyl group), it forms a diastereomeric salt with an appropriate optically active acid or base, and then passes through a conventional method known in the art The diastereoisomers are resolved, and then the pure enantiomers are recovered.
- the separation of enantiomers and diastereomers is usually accomplished through the use of chromatography, which employs a chiral stationary phase and is optionally combined with chemical derivatization (for example, the formation of amino groups from amines). Formate).
- the compounds of the present invention may contain unnatural proportions of atomic isotopes on one or more of the atoms constituting the compound.
- compounds can be labeled with radioisotopes, such as tritium ( 3 H), iodine-125 ( 125 I) or C-14 ( 14 C).
- radioisotopes such as tritium ( 3 H), iodine-125 ( 125 I) or C-14 ( 14 C).
- heavy hydrogen can be used to replace hydrogen to form deuterated drugs.
- the bond formed by deuterium and carbon is stronger than the bond formed by ordinary hydrogen and carbon.
- deuterated drugs have reduced toxic side effects and increased drug stability. , Enhance the efficacy, extend the biological half-life of drugs and other advantages.
- the conversion of all isotopic compositions of the compounds of the present invention, whether radioactive or not, is included in the scope of the present invention.
- pharmaceutically acceptable carrier refers to any preparation or carrier medium that can deliver an effective amount of the active substance of the present invention, does not interfere with the biological activity of the active substance, and has no toxic side effects on the host or patient.
- Representative carriers include water, oil, Vegetables and minerals, cream base, lotion base, ointment base, etc. These bases include suspending agents, tackifiers, penetration enhancers and the like. Their formulations are well known to those skilled in the field of cosmetics or topical medicine.
- substituted means that any one or more hydrogen atoms on a specific atom are replaced by substituents, and may include deuterium and hydrogen variants, as long as the valence of the specific atom is normal and the substituted compound is stable of.
- oxygen it means that two hydrogen atoms are replaced. Oxygen substitution does not occur on aromatic groups.
- optionally substituted means that it can be substituted or unsubstituted. Unless otherwise specified, the type and number of substituents can be arbitrary on the basis that they can be chemically realized.
- any variable such as R
- its definition in each case is independent.
- the group can optionally be substituted with up to two Rs, and R has independent options in each case.
- combinations of substituents and/or variants thereof are only permitted if such combinations result in stable compounds.
- linking group When the number of a linking group is 0, such as -(CRR) 0 -, it means that the linking group is a single bond.
- alkyl is used to indicate a linear or branched saturated hydrocarbon group, which can be mono-substituted (such as -CH 2 F) or multi-substituted (such as -CF 3 ), and can be monovalent (such as Methyl), divalent (such as methylene) or multivalent (such as methine).
- alkyl groups examples include methyl (Me), ethyl (Et), propyl (e.g., n-propyl and isopropyl), butyl (e.g., n-butyl, isobutyl, s-butyl) , T-butyl), pentyl (eg, n-pentyl, isopentyl, neopentyl) and the like.
- C 1-3 alkyl is used to indicate a linear or branched saturated hydrocarbon group composed of 1 to 3 carbon atoms.
- the C 1-3 alkyl group includes C 1-2 and C 2-3 alkyl groups, etc.; it can be monovalent (such as methyl), divalent (such as methylene) or multivalent (such as methine) .
- Examples of C 1-3 alkyl include, but are not limited to, methyl (Me), ethyl (Et), propyl (including n-propyl and isopropyl), and the like.
- halogen or “halogen” by itself or as part of another substituent represents a fluorine, chlorine, bromine or iodine atom.
- haloalkyl is intended to include monohaloalkyl and polyhaloalkyl.
- halo(C 1 -C 4 )alkyl is intended to include, but is not limited to, trifluoromethyl, 2,2,2-trifluoroethyl, 4-chlorobutyl, 3-bromopropyl, etc. Wait.
- examples of haloalkyl include, but are not limited to: trifluoromethyl, trichloromethyl, pentafluoroethyl, and pentachloroethyl.
- C n-n+m or C n -C n+m includes any specific case of n to n+m carbons, for example, C 1-12 includes C 1 , C 2 , C 3 , C 4 , C 5 , C 6 , C 7 , C 8 , C 9 , C 10 , C 11 , and C 12 , including any range from n to n+m, for example, C 1-12 includes C 1-3 , C 1-6 , C 1-9 , C 3-6 , C 3-9 , C 3-12 , C 6-9 , C 6-12 , and C 9-12, etc.; in the same way, from n to n +m means the number of atoms in the ring is n to n+m, for example, 3-12 membered ring includes 3-membered ring, 4-membered ring, 5-membered ring, 6-membered ring, 7-membered ring, 8-membered ring, 9-membered
- the solvent used in the present invention is commercially available.
- aq stands for water
- HATU O-(7-azabenzotriazol-1-yl)-N,N,N',N'-tetramethylurea hexafluorophosphate
- EDC stands for N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride
- m-CPBA stands for 3-chloroperoxybenzoic acid
- eq stands for equivalent, equivalent amount
- CDI stands for Carbonyl diimidazole
- DCM stands for dichloromethane
- PE stands for petroleum ether
- DIAD diisopropyl azodicarboxylate
- DMF stands for N,N-dimethylformamide
- DMSO stands for dimethyl sulfoxide
- EtOAc stands for ethyl acetate Esters
- EtOH stands for ethanol
- MeOH stands for methanol
- CBz stands for benzyloxycarbonyl, which is an
- the compounds of the present invention are based on conventional naming principles in the field or The software is named, and the commercially available compounds use the supplier catalog name.
- Dissolve compound 1a (23.0g, 328mmol, 24.5mL, 1.0eq) and zinc diiodide (5.20g, 16.4mmol, 0.05eq) in 200ml of dichloromethane, reduce the internal temperature to 0°C, add trimethyl Silica cyanide (39.1g, 393mmol, 49mL, 1.2eq), the reaction solution was reacted at 25°C for 18 hours, the reaction was complete, the reaction solution was concentrated and added 50ml of acetonitrile and 50ml of aqueous hydrochloric acid (1N), stirred at 25°C for 5 minutes .
- 1b (16.0g, 164mmol, 1eq) was added to a tetrahydrofuran solution (300mL) containing lithium tetrahydroaluminum (9.38g, 247mmol, 1.5eq), and reacted at 20°C for 18 hours. After the reaction was complete, water (9.38 mL), 15% sodium hydroxide (9.38 mL) and water (28.1 mL) were sequentially added to the reaction solution, stirred for 15 minutes, filtered, and concentrated to obtain 1c.
- triphenylmethylphosphonium bromide 25.9g, 72.6mmol, 1.6eq
- potassium tert-butoxide 1M, 81.7mL, 1.8eq
- the reaction solution was The reaction was carried out at 20°C for 3 hours, and 3a (8.0 g, 45.4 mmol, 1 eq) was added to the reaction solution and reacted for 18 hours.
- the labeled mTOR kinase was stably expressed in HEK-293 cells.
- Ligand beads were blocked with excess biotin and washed with buffer (1% bovine serum albumin, 0.05% Tween 20 ml, 1 ml dithiothreitol) to wash away unbound ligands and non-specific binding ⁇ ligand;
- buffer 1% bovine serum albumin, 0.05% Tween 20 ml, 1 ml dithiothreitol
- test compound is dissolved in dimethyl sulfoxide
- the 10 affinity beads were resuspended in buffer (1x PBS, 0.05% Tween 20, 0.5 ⁇ m non-biotin affinity ligand) and incubated at room temperature for 30 minutes.
- the compound of the present invention has significant or unexpected mTOR kinase inhibitory activity.
- Experimental purpose to detect the inhibitory activity of the test compound on cell proliferation.
- Luciferase in Cell-Titer-Glo reagent uses luciferin, oxygen and ATP as reaction substrates to produce oxyluciferin and release energy in the form of light. Since the luciferase reaction requires ATP, the total amount of light produced by the reaction is directly proportional to the total amount of ATP that reflects cell viability.
- MCF-7 cell line ATCC-CRL-22
- HT-29 cell line ATCC-HTB-38
- OE21 ECACC-96062201
- NCI-N87 cell line ATCC-CRL-5822
- Cell culture medium (RPMI 1640 medium (Invitrogen#1868546; 10% serum Invitrogen#1804958; L-glutamine 1 spin, Invitrogen#1830863; double antibody Hyclone#J170012))
- the compound stock solution is 10 mM, and the compound is diluted with DMSO to make the initial concentration 4 mM. Add the compound to the compound mother liquid plate, 9 ⁇ L per well.
- Test result The test result is shown in Table 2
- the compound of the present invention has obvious proliferation inhibitory activity on MCF-7, N87 and OE-21 cells, and has a certain proliferation inhibitory activity on HT-29 cells.
- test compound was mixed with 5% DMSO/95% 10% polyoxyethylene castor oil (Cremophor EL), vortexed and sonicated to prepare an approximately clear solution of 1 mg/mL, which was filtered with a microporous membrane for use.
- Cremophor EL polyoxyethylene castor oil
- the test compound was mixed with 1% Tween 80, 9% polyethylene glycol 400, 90% aqueous solution, vortexed and sonicated to prepare a 1 mg/mL approximately clear solution, which was filtered through a microporous membrane for use.
- mice Female BALB/c nude mice, 6-8 weeks old, weighing 18-22 grams; Supplier: Nanda model animals
- Human nasopharyngeal carcinoma C666-1 cells were cultured in a monolayer in vitro, and the culture conditions were DMEM medium with 10% fetal bovine serum, 100U/mL penicillin, 100U/mL streptomycin, 37°C, 5% CO 2 culture. Use pancreatin-EDTA for routine digestion and passage twice a week. When the cell saturation is 80%-90%, the cells are collected, counted, and seeded.
- test compound was formulated into clear solutions of 5 mg/mL and 5 mg/mL, and the solvent was 5% DMSO + 30% PEG400 + 65% water
- the experimental index is to investigate whether the tumor growth is inhibited, delayed or cured.
- the tumor diameter was measured with vernier calipers twice a week.
- TGI (%) reflects the tumor growth inhibition rate.
- TGI(%) [1-(Average tumor volume at the end of a certain treatment group-average tumor volume at the beginning of the treatment group)/(Average tumor volume at the end of treatment in the solvent control group- The average tumor volume at the start of treatment in the solvent control group)] ⁇ 100%.
- T/C (%) average tumor volume at the end of a certain treatment group/average tumor volume at the end of the solvent control group ⁇ 100%.
- the body weight of experimental animals is used as a reference index for indirect determination of drug toxicity.
- the body weight of the mice has a tendency to decrease, one in the solvent group died early, and the stocking density was suspected to be too high, and no abnormalities were found in the anatomy; in the example 2 group, one died on the 28th day with too low body weight and too much toxicity. No abnormalities were found during anatomy. (One in the AZD2014 group and the Example 2 group weighed less than 17g)
- c.p value is calculated based on tumor volume.
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Abstract
Description
Claims (11)
- 根据权利要求1所述化合物或其药学上可接受的盐在制备治疗鼻咽癌药物中的应用,其中,R 1选自CH 3、CF 3、CH 2CH 3、CF 2CH 3、CHFCH 2F和CF 2CH 2F。
- 根据权利要求1或2所述化合物或其药学上可接受的盐在制备治疗鼻咽癌药物中的应用,其中,R 1选自CH 3。
- 根据权利要求1所述化合物或其药学上可接受的盐在制备治疗鼻咽癌药物中的应用,其中,R 2选自CH 3、CF 3、CH 2CH 3、CF 2CH 3、CHFCH 2F和CF 2CH 2F。
- 根据权利要求1或4所述化合物或其药学上可接受的盐在制备治疗鼻咽癌药物中的应用,其中,R 2选自CH 3。
- 根据权利要求1所述化合物或其药学上可接受的盐在制备治疗鼻咽癌药物中的应用,其中,R 3选自CH 3、CF 3、CH 2CH 3、CF 2CH 3、CHFCH 2F和CF 2CH 2F。
- 根据权利要求1或6所述化合物或其药学上可接受的盐在制备治疗鼻咽癌药物中的应用,其中,R 3选自CH 3。
- 根据权利要求1所述化合物或其药学上可接受的盐在制备治疗鼻咽癌药物中的应用,其中,R 4分别独立地选自H、F、Cl、Br、I、CH 3、CF 3、CH 2CH 3、CF 2CH 3、CHFCH 2F和CF 2CH 2F。
- 根据权利要求1或8所述化合物或其药学上可接受的盐在制备治疗鼻咽癌药物中的应用,其中,R 4分别独立地选自H和F。
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CN105530937A (zh) * | 2013-03-13 | 2016-04-27 | 昂克希尔迪克斯有限公司 | 使用7-苄基-10-(2-甲基苄基)-2,6,7,8,9,10-六氢咪唑并[1,2-a]吡啶并[4,3-d]嘧啶-5(3h)-酮的联合疗法 |
WO2019085996A1 (zh) * | 2017-11-06 | 2019-05-09 | 南京明德新药研发股份有限公司 | 作为mTORC1/2双激酶抑制剂的吡啶并嘧啶类化合物 |
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