CRYSTAL FORM OF COMPOUND FOR INHIBITING THE ACTIVITY OF CDK4/6 AND USE THEREOF
20210261546 · 2021-08-26
Assignee
Inventors
- Yiqian Wang (Beijing, CN)
- Chunhui Zhang (Beijing, CN)
- Jiabing Wang (Beijing, CN)
- Lieming Ding (Zhejiang, CN)
Cpc classification
A61P35/00
HUMAN NECESSITIES
International classification
Abstract
The present invention relates to a salt form of (R)—N-(5-((4-ethylpiperazin-1-yl)methyl)pyridin-2-yl)-5-fluoro-4-(6-fluoro-1-methyl-1,2,3,4-tetrahydrobenzo[4,5]imidazo[1,2-a]pyridin-8-yl)pyrimidin-2-amine (compound I) as shown in structural formula (I) or a crystal form thereof, and also relates to a method for preparing the salt form of compound I and/or the crystal form thereof, a pharmaceutical composition containing the salt form and/or the crystal form, and the use of same in the preparation of drugs for treating diseases, illnesses or conditions, or a method for treating diseases, illnesses or conditions.
##STR00001##
Claims
1. A salt of a compound as shown in Formula I or a crystal form of the salt: ##STR00008##
2. The salt or the crystal form of the salt according to claim 1, wherein, the salt is tartaric acid salt, wherein, the tartaric acid salt is L-tartaric acid salt.
3. The salt or the crystal form of the salt according to claim 2, wherein, the tartaric acid salt has a structure as shown in Formula II: ##STR00009##
4. A crystal form of a compound as shown in Formula II.
5. The crystal form according to claim 4, wherein, the X-ray powder diffraction pattern of the crystal form has characteristic peaks at the diffraction angle 2θ of 4.4±0.2°, 23.6±0.2° and 26.9±0.2°.
6. The crystal form according to claim 5, wherein, the X-ray powder diffraction pattern of the crystal form has characteristic peaks at the diffraction angle 2θ of 4.4±0.2°, 8.7±0.2°, 10.8±0.2°, 18.4±0.2°, 23.6±0.2° and 26.9±0.2°.
7. The crystal form according to claim 6, wherein, the X-ray powder diffraction pattern of the crystal form has characteristic peaks at the diffraction angle 26 of 4.4±0.2°, 8.7±0.2°, 10.8±0.2°, 15.9±0.2°, 18.4±0.2°, 23.6±0.2° and 26.9±0.2°.
8. The crystal form according to claim 4, wherein, the crystal form approximately has an X-ray powder diffraction pattern as shown in
9. The crystal form according to claim 4, wherein, the crystal form approximately has an X-ray powder diffraction pattern as shown in
10. The crystal form according to claim 4, wherein, the crystal form is prepared by following steps: 1) suspending (R)—N-(5-((4-ethylpiperazin-1-yl)methyl)pyridin-2-yl)-5-fluoro-4-(6-fluoro-1-methyl-1,2,3,4-tetrahydrobenzo[4,5]imidazo[1,2-a]pyridin-8-yl)pyrimidin-2-amine (the compound as shown in Formula I) in water and/or a water-soluble organic solvent, obtaining a suspension; 2) heating the suspension to 50° C. or more; 3) keeping the temperature at 50° C. or more, adding L-tartaric acid to the suspension, and carrying out an acidification treatment, obtaining a clear solution; 4) cooling the clear solution to room temperature, filtering while stirring, drying the filter cake, obtaining the crystal form according to claim 4.
11. The crystal form according to claim 4, wherein, the crystal form is prepared by following steps: dissolving the compound as shown in Formula I in methanol at 50-70° C. to obtain a clear solution, dissolving L-tartaric acid in methanol, adding the solution of L-tartaric acid in methanol dropwise to the solution of the compound as shown in Formula I in methanol, filtering after stirring, drying a filter cake at 40-70° C., obtaining the crystal form according to claim 4.
12. A crystal form of L-tartaric acid salt of the compound as shown in Formula I, wherein, the crystal form approximately has an X-ray powder diffraction pattern as shown in
13. A compound of Formula III or a crystal form thereof: ##STR00010##
14. The compound or the crystal form according to claim 13, wherein, the crystal form is prepared by following steps: 1) suspending (R)—N-(5-((4-ethylpiperazin-1-yl)methyl)pyridin-2-yl)-5-fluoro-4-(6-fluoro-1-methyl-1,2,3,4-tetrahydrobenzo[4,5]imidazo[1,2-a]pyridin-8-yl)pyrimidin-2-amine (the compound as shown in Formula I) in water and/or a water-soluble organic solvent, obtaining a suspension; 2) heating the suspension to 50° C. or more; 3) keeping the temperature at 50° C. or more, adding methanesulfonic acid to the suspension, and carrying out an acidification treatment, obtaining a clear solution; 4) cooling the clear solution to room temperature, filtering while stirring, drying the filter cake, obtaining the crystal form according to claim 13.
15. The compound or the crystal form according to claim 13, wherein, the crystal form approximately has an X-ray powder diffraction pattern as shown in
16. The compound or the crystal form according to claim 13, wherein, the crystal form approximately has an X-ray powder diffraction pattern as shown in
17. The compound or the crystal form according to claim 13, wherein, the crystal form approximately has an X-ray powder diffraction pattern as shown in
18. The compound or the crystal form according to claim 13, wherein, the crystal form approximately has an X-ray powder diffraction pattern as shown in
19. A method for preparing L-tartaric acid salt of (R)—N-(5-((4-ethylpiperazin-1-yl)methyl)pyridin-2-yl)-5-fluoro-4-(6-fluoro-1-methyl-1,2,3,4-tetrahydrobenzo[4,5]imidazo[1,2-a]pyridin-8-yl)pyrimidin-2-amine (the compound as shown in Formula II), comprising: ##STR00011##
20. A pharmaceutical composition, comprising a therapeutically effective amount of the crystal form according to claim 4, and pharmaceutically acceptable excipients, auxiliaries and/or carriers.
21. A pharmaceutical composition, comprising a therapeutically effective amount of the compound or the crystal form thereof according to claim 13, and pharmaceutically acceptable excipients, auxiliaries and/or carriers.
22-24. (canceled)
25. A method of treating a disease mediated by CDK, comprising administering the salt or the crystal form according to claim 1 to a subject.
26. The method according to claim 25, wherein the disease is a cancer and/or proliferative disease.
27. The method according to claim 25, wherein the disease is breast cancer, lung cancer, melanoma, colon cancer, liver cancer, pancreatic cancer, brain cancer, kidney cancer, ovarian cancer, gastric cancer, skin cancer, bone cancer, glioma, lymphoma, neuroblastoma, hepatocellular carcinoma, papillary renal cell carcinoma and/or squamous cell carcinoma of the head and neck.
28. The method according to claim 25, wherein, the subject is a human.
Description
DESCRIPTION OF THE DRAWINGS
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[0151] In the above
EXAMPLES
[0152] The present invention will be further illustrated by the following examples, but it should not be construed that the present invention is confined to the scope of the examples. In the techniques or methods of the following examples, where the specific conditions were not specifically described, they could be selected from conventional methods and conditions.
[0153] Abbreviations: [0154] Cbz-Cl: Benzyl chloroformate; [0155] DCM: Dichloromethane; [0156] DMF: N, N-Dimethylformamide; [0157] DMSO: Dimethyl sulfoxide; [0158] DSC: Differential scanning calorimetry; [0159] DVS: Dynamic vapor adsorption; [0160] EtOH: Ethanol; [0161] EtOAc: Ethyl acetate; [0162] KOAc: Acetic acid potassium; [0163] KO-t-Bu: Potassium tert-butoxide; [0164] MeOH: methanol; [0165] P(Cy).sub.3: Tricyclohexylphosphine; [0166] Pd(OAc).sub.2: Palladium acetate; [0167] Pd(dppf)Cl.sub.2: [1,1′-Bis(diphenylphosphino)ferrocene] palladium dichloride; [0168] RT: room temperature; [0169] RH: Relative humidity; [0170] TGA: Thermogravimetric analysis; [0171] TEA: Triethanolamine; [0172] THF: Tetrahydrofuran; [0173] Xantphos: 4,5-bis(diphenylphosphino)-9, 9-dimethylxanthene; [0174] XRD: X-ray powder diffraction pattern.
Example 1 Synthesis of Crystal Form A of Compound II
[0175] ##STR00006##
Synthesis of 1-A1-01 (Step 1)
[0176] DCM (20 L), 1-A1-S1 (300 g) and Et.sub.3N (390 g) was added to 50 L reaction kettle, and cooled to below −5° C., then to the mixture above was dropwise added Cbz-Cl (570 g) for 5. After the dropping is completed, the reaction mixture was warmed to room temperature and reacted, TLC (EtOAc:hexane=1:3) monitored until the reaction was completed. To the reaction mixture was added water (1.5 L), then concentrated hydrochloric acid (80 mL) was slowly dropwise added, pH was adjusted to 1-2. The organic phase was separated and then washed with 15 L of water, dried over anhydrous Na.sub.2SO.sub.4 for 0.5 h, filtered to remove the drying agent, the filtrate was collected and concentrated. 730 g of 1-A1-01 (crude) was obtained as light yellow oily liquid in 95.4% yield.
Synthesis of 1-A1-02 (Step 2)
[0177] To a 20 L reaction flask was added 720 mL of DCM, DMSO (90 g), the mixture was stirred and cooled to below −65° C. under nitrogen, then COCl.sub.2 was dropwise added for 2 h. After the dropping is completed, the mixture was stirred for 20 min below −65° C.; then a solution of 1-A1-01 in DCM (143 g/500 mL DCM) was dropwise added for 40 min. After the dropping is completed, the mixture was reacted for 15 min below −65° C. Below −65° C., to the mixture was dropwise added TEA for 2 h. After the dropping is completed, the reaction mixture was warmed to −20° C., then 250 L water was added, pH was adjusted to 1-2 with HCl. The organic phase was separated and then washed with water (1 L×2), dried over anhydrous Na.sub.2SO.sub.4, filtered to remove the drying agent, the filtrate was collected and concentrated. 432 g of crude 1-A1-02 was obtained as yellow oily liquid. The crude produce was directly used in the next step.
Synthesis of 1-A1-03 (Step 3)
[0178] 400 mL THF, KOt-Bu (215 g) was added to 1 L reaction kettle, and cooled to 5-15° C., to the mixture was dropwise added triethyl phosphonoacetate (430 g) for 50 min. After the dropping is completed. A solution of 1-A1-02 in THF (431 g/100 mL THF) was dropwise for 1 h below 15° C. After the dropping is completed, TLC (EtOAc:hexane=1:3) monitored until the reaction was completed. To the reaction mixture was added saturated NaCl (1.5 L), THF phase was collected. The water phase was exacted with DCM (2 L), then the organic phase was dried over anhydrous Na.sub.2SO.sub.4 for 0.5 h, filtered to remove the drying agent, the filtrate was collected and concentrated. The residue was purified by column chromatography. 390 g of 1-A1-03 was obtained as light yellow oily liquid.
Synthesis of 1-A1-041 (Step 4)
[0179] Aqueous NaOH solution (301 g NaOH/1.5 L water) was added to a solution of 1-A1-03 in THF (601 g/2.3 L THF), and heated to reflux for 3-4 h in a 5 L reaction kettle. The resulting mixture was cooled to 40-50° C., stranded and separated, the organic phase (THF) was collected and concentrated to give a solid. The solid was dissolved in water (20 L), the water phase was extracted with methyl tertiary butyl ether (2 L), EtOAc (2 L), methyl tertiary butyl ether (2 L) sequently. Then the water phase was adjusted pH to 1-2 with concentrated HCl, and extracted with EtOAc (1.5 L, 3 L) for two times. The organic phase was combined, and dried over anhydrous Na.sub.2SO.sub.4 for 0.5 h, filtered to remove the drying agent, the filtrate was collected and concentrated to give a solid. The solid was slurried with isopropyl ether (3 L) for 2 h, filtered to give a solid. The solid was washed with isopropyl ether (1 L). The solid is dried for 3-4 h at 50° C. by air blowing. 331 g of 1-A1-041 was obtained as a light yellow solid in 52.7% yield.
Synthesis of 1-051 (Step 5)
[0180] 1-A1-041 (600 g), methanol (25 L), concentrated H.sub.2SO.sub.4 was added to 50 L reaction kettle, and heated to reflux for 3-4 h. After the reaction is finished, the reaction mixture was cooled to room temperature. Then the mixture was concentrated, to the residue obtained was added DCM (15 L), then the mixture was adjusted to pH=9-10 with K.sub.2CO.sub.3. The organic phase was collected, dried over anhydrous Na.sub.2SO.sub.4 for 0.5 h, filtered to remove the drying agent, the filtrate was collected and concentrated. 6.37 kg of 1-A1-051 was obtained as a white-off solid in 97.3% yield.
Synthesis of 1-A1 (Step 6)
[0181] 1-AT-051 (500 g), methanol (1.8 L) and Pd/C was added to a 2 L reaction kettle, the system was replaced air with nitrogen, and replaced nitrogen with hydrogen for three times in turn. The mixture was heated to 85° C., and reacted at 3.0 Mpa under hydrogen atmosphere for 3 h. The resulting mixture was cooled to room temperature, filtered to remove Pd/C, collected the organic phase, and the organic phase was concentrated to give a light yellow solid. To the solid was added isopropyl ether (3 L) and crystallized at −20° C. for 1 h, filtered to give a solid, the solid was washed with isopropyl ether (500 mL). 234 g of 1-A1 was obtained as a light yellow solid in 90.5% yield.
Synthesis of 1-A2 (Step 7)
[0182] POCl.sub.3 (413 g) was dropwise added to a mixture of 1-A1 (200 g) and 4-bromo-2,6-difluoroaniline (410 g) toluene (1.2 L) in 50 L reaction kettle for 1 h. After the dropping is completed, Et.sub.3N was dropwise added in an ice bath for 1 h. After the dropping is completed, the mixture was heated to 110° C. and reacted for 1 h. Then the reaction mixture was cooled to 2-10° C., 1 L water was added, and the mixture was adjusted to pH=9-10 with saturated K.sub.2CO.sub.3, and extracted with EtOAc (1.5 L, 1 L) for two times, combined the organic phase. Then the organic phase was extracted with 2 L saturated NaCl, and dried over anhydrous Na.sub.2SO.sub.4 for 0.5 h, filtered to remove the drying agent, the filtrate was collected and concentrated to give a solid. The solid was slurried with isopropyl ether (1 L) for 10 min, filtered. 460 g of 1-A2 was obtained as a yellow solid.
Synthesis of 1-A3 (Step 8)
[0183] A mixture of 1-A2 (450 g), DMF (2 L), Cs.sub.2CO.sub.3 (700 g) was stirred at 110° C. for 24 h in a reaction kettle. TLC monitored until the reaction was completed. To the resulting mixture was added EtOAc (3 L), filtered to remove solid impurities, the filtrate was extracted with saturated NaCl (1 L×5), and the organic phase was dried over anhydrous Na.sub.2SO.sub.4 for 0.5 h, concentrated to give a solid, then the solid was slurried with methyl tertiary butyl ether (1 L×2) for 30 min, filtered. 382 g of 1-A3 was obtained as a light yellow solid in 90.10% yield.
Synthesis of 1-01 (Step 9)
[0184] 1-A3 (380 g), Bis(pinacolato)diboron (400 g), KOAc (340 g), Pd(OAc).sub.2 (6 g), P(Cy).sub.3 (7 g), 1,4-dioxane was added to a reaction kettle, the mixture was heated to 90° C. and reacted for 2 h under nitrogen. TLC monitored until the reaction was completed. The resulting mixture was cooled to room temperature, filtered, the filtrate was concentrated to remove 1,4-dioxane, the residue was purified by column chromatography with n-hexane and DCM, then the resulting product was slurried with n-hexane (1.2 L) for 1 h. 334 g of 1-01 was obtained as a grey solid in 70.10% yield.
Synthesis of 1-02 (Step 10)
[0185] A mixture of 1-01 (128 g), 1,4-dioxane (1 L), 1-S3 (85 g), K.sub.2CO.sub.3 (110 g), Pd(dppf)Cl.sub.2. DCM was heated to 60° C. and reacted for 4 h under nitrogen in a 2 L three-neck bottle. The reaction mixture was cooled to room temperature, and concentrated under reduced pressure to remove 1,4-dioxane. To the residue was added DCM (1.5 L) and water (1.1 L), stirred, stranded and separated. The water phase was extracted with DCM (10 L). The combined organic phase was extracted with 0.5% HCl (1 L×2), and saturated NaCl sequently. The organic phase was dried over anhydrous Na.sub.2SO.sub.4 (500 g), filtered to remove the drying agent, the filtrate was concentrated under reduced pressure. To the residue was added EtOAc (0.5 L) and stirred for 30 min to precipitate a solid, filtered. The solid was washed with EtOAc (0.5 L), then dried at 45° C. for 3 h in vacuum, a yellow solid (120 g) was obtained.
Synthesis of 1-03 (Step 11)
[0186] A mixture of 1-02 (100 g), 1,4-dioxane (1 L), 1-C2 (80 g), Cs.sub.2CO.sub.3 (163 g), Pd(OAc).sub.2 (2 g) and 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene (Xantphos) (4 g) was stirred at 85° C. in 2 L three-neck bottle under nitrogen. After the reaction is finished, the resulting solution was cooled to room temperature, filtered to give a solid, the solid was washed with EtOAc. Then the solid was added to a mixture of DCM (1.5 L) and water (1.1 L), stirred, stranded, and the organic layer was separated out. Then the water phase was extracted with DCM (700 mL). And the organic phase was combined, then was washed with water (700 mL×2). The organic phase was dried over anhydrous Na.sub.2SO.sub.4 (700 g). Na.sub.2SO.sub.4 was removed by filtration, the filtrate was concentrated. To the residue was added methanol (0.5 L) and heated to 55˜65° C. for 0.5 h, then cooled to room temperature, filtered to give a solid, the solid was washed with EtOAc 500 mL. The solid was dried at 45° C. under vacuum for 8 h. 111.79 g of 1-03 was obtained as a light yellow solid.
Synthesis of Compound II (Step 12)
[0187] 1-03 (500 g), anhydrous methanol (3.8 L) was added to 10 L reaction kettle and heated to 65° C. After the mixture was stirred to a clear solution for 0.5 h, a solution of L-tartaric acid in methanol (150.89 g tartaric acid was dissolved in 500 mL anhydrous methanol) was dropwise added. The dropping time is controlled in range of 45-60 min. After the dropping is completed, the mixture was stirred at 65° C. for 4 h, a solution of L-tartaric acid in methanol (35.58 g tartaric acid was dissolved in 250 mL anhydrous methanol) was continuously dropwise added. The dropping time is controlled in range of 30-45 min. After the dropping is completed, the mixture was stirred at 65° C. for another 1 h, a solution of L-tartaric acid in methanol (36.55 g tartaric acid was dissolved in 250 mL anhydrous methanol) was continuously dropwise added. The dropping time is controlled in range of 30-45 min. After the dropping is completed, the mixture was stirred at 65° C. for another 1.5 h. The mixture was cooled to 20-30° C., filtered, the filter cake was washed with methanol (400 mL×2), then dried at 45° C. for 36 h in vacuum. 530.64 g of compound II was obtained as a light yellow crystal power. It showed that the crystal form was the crystal form A of compound II by X ray powder diffraction.
Example 2 the Detection Result of XRD
[0188] A small sample of compound II (batch number: 1072 P 04-A 14 S 01) and a pilot sample of compound II (batch number: 20170903) was synthesized according to the method of example 1, then the small sample and the pilot sample was then characterized by XRD.
[0189] In one embodiment of the invention, XRD analysis of the small sample (batch number: 1072P04-A14S01) was performed by SoliPharmausing Bruker D8 Advance Diffractometer. The detection instruments and detection parameters were showed in table 1, the data of XRD pattern was shown in table 2.
TABLE-US-00001 TABLE 1 XRD detection instruments and detection parameters of the small sample device X-ray powder diffraction (XRD) & Heating stage XRD instruments Bruker D8 Advance diffractometer Technical copper target wavelength: Kα = 1.54Å radiation index (40 kV, 40 mA), θ-2θ goniometer, Mo monochromator, Lynxeye detector Calibration Al.sub.2O.sub.3 material Acquisition Diffrac Plus XRD Commander software Analysis MDI Jade 6 software method specification of no 24.6 mm diameter × parameter reflection sample plate 1.0 mm thickness Variable temperature copper plate heating table sample plate Angle of detection 3~40° Step length 0.02°/step speed 0.2 s/step
TABLE-US-00002 TABLE 2 XRD data of the small sample Relative peak# 2θ(°) intensity (I %) 1 4.4 100.0 2 8.8 19.3 3 10.9 24.3 4 16.0 25.1 5 18.5 25.4 6 23.7 32.0 7 27.0 44.5
[0190] In another embodiment, XRD analysis of the pilot sample (batch number: 20170903) was performed by Beijing Center for Physical & Chemical Analysisusing D8-Advance Xradiation diffractometer, the reference method was JY/T 009-1996 General rules for X-ray polycrystalline diffractometry
. The detection instrument and detection parameter were showed in table 3, the data of XRD pattern was shown in table 4.
TABLE-US-00003 TABLE 3 XRD detection instruments and detection parameters of the pilot sample instruments D8-Advance X radiation diffractometer technical indicator copper target wavelength: 1.5406 nm operating voltage: 40 kV operating current: 40 mA experiment condition 2θ scanned area 3~40° Step length 0.02°/step Residence time 0.1 s/step
TABLE-US-00004 TABLE 4 Relative peak# 2θ(°) intensity (I %) 1 4.4 100.0 2 8.7 20.9 3 10.8 19.8 4 15.9 14.0 5 18.4 17.5 6 23.6 22.6 7 26.9 34.6
[0191] It will be appreciated by those skilled in the art that during the acquisition of XRD patterns, the relevant data may be subjected to appropriate scientific processing, such as baseline correction processing, to reduce errors. It will also be appreciated by those skilled in the art that there may be some variation in the 20 angle or degree of separation, etc., of the resulting XRD pattern when operated under different laboratory conditions. It is to be understood that the XRD pattern of the crystal form A of Compound II provided by the present invention is not limited to the X-ray powder diffraction pattern shown in
Example 3 the Stability of the Crystal Form
[0192] The detection instruments and methods of X-ray powder diffraction pattern in the present invention and was shown in table 1. The crystal form A of compound II, the crystal form D of compound III and the crystal form F of compound III was dried at 80° C. for 24 h, or 25° C., 60% RH for 10 days, or 40° C., 75% RH for 10 days, and XRD pattern shown in
TABLE-US-00005 TABLE 5 Stability test results of different crystal forms of compound II 25° C., 40° C., crystal form of 80° C., 60% RH, 75% RH, is the compound 24 h 10 days placed 10 days crystal form A of XRD XRD XRD the compound II unchanged unchanged unchanged crystal form D of XRD XRD XRD the compound III unchanged changed changed crystal form F the XRD XRD XRD compound III changed changed changed
[0193] The XRD pattern of crystal form A of compound II at different conditions was shown in
[0194] In addition, the crystal form B of compound II was a metastable crystal form that was poorly crystal, and the crystal form B was heated to 180° C. which could be converted to crystal form A.
Example 4 Crystal Form Long-Term Stability Determination
[0195] Samples of crystal form A of compound I and compound II were placed at 25° C.±2° C., and a relative humidity of 60%±10% for 18 months, respectively. And samples were detected by HPLC at 0 month, 3 months and 18 months, respectively, and the results were as shown in table 6.
TABLE-US-00006 TABLE 6 the results of crystal form A compound I and compound II at 0 month, 3 months and 18 months detected by HPLC samples crystal formA Detection Item time compound I of compound II Maximum single 0 month 0.04% 0.05% impurity content (%) 3 month 0.10% 0.05% 18 month 0.22% 0.06% Total impurity 0 month 0.11% 0.10% content (%) 3 month 0.17% 0.13% 18 month 1.0% 0.21% Content > 0.1% 0 month 0 0 Number of unknown 3 month 0 0 impurities (s) 18 month 4 0
[0196] As shown in Table 6, it can be seen that after 18 months both the maximum single impurity content and the total impurity content of Compound I were more than 3 times that of the crystal form A of Compound II. The crystal form A of Compound II produces impurities in an amount less than 0.1% after 18 months, while compound I produced four impurities in an amount greater than 0.1%. The stability of the crystal form A of compound II was significantly improved compared to Compound I.
Example 5 Dynamic Moisture Sorption (DVS) Determination
[0197] The instruments and methods of Dynamic moisture adsorption in the present invention was shown in table 7, the results of DVS was shown in table 8.
TABLE-US-00007 TABLE 7 instruments and methods of Dynamic moisture adsorption device Dynamic moisture adsorption instrument(DVS) instruments TA Instruments Q5000TGA Control software Thermal Adventage Analysis software Universal Analysis Sample tray Platinum crucible Sample detection 1-10 mg amount Protective gas nitrogen flow rate of gas 10 mL/min Criterion of Non-hygroscopic No more than 0.2% judgment Slight moisture more than 0.2%, but momore absorption than 2.0% Easy moisture more than 2%, but nomore absorption than 15% Extreme moisture more than 15% absorption
TABLE-US-00008 TABLE 8 the results of DVS Weight change in the range crystal form of compound of 0% RH-80% RH crystal form A of compound II 5.3% crystal form B of compound II 5.5% crystal form D of compound III 17.2% crystal form F of compound III 16.6%
[0198] The crystal form A and crystal form B of compound II: weight changes in the range of 0% RH to 80% RH were about 5.3% and 5.5%, while the crystal form D and crystal form F of compound III: weight changes in the range of 0% RH to 80% RH were about 17.2% and 16.6%. It can be seen therefrom that the crystal form of compound II is less hygroscopic than the crystal form of compound III and is more suitable for the preparation of solid formulations.
Example 6 Solubility Determination
[0199] Solubility tests were performed on the crystal form A of compound II, the crystal form D of compound III, and the compound I. The results of solubility in water at room temperature were shown in Table 9. It can be seen that different crystal forms of compound II have different properties of improvement in solubility, and the crystal form A of compound II exhibits excellent dissolution properties.
TABLE-US-00009 TABLE 9 Solubility results of different crystal forms of compound II solubility at room Classification crystal form of compound temperature in water of solubility crystal form A of compound II 100-200 mg/mL Readily-soluble crystal form D of compound III 50-100 mg/mL soluble compound I <1 mg/mL Very little soluble Note: the classification standard of solubility follows the relevant provisions in the four general cases of Pharmacopoeia of the people's replublic of China (2015)
.
Example 7 Pharmacokinetic Experiment
[0200] A total of 12 SD rats were divided into two groups, 6 in each group, each half of male and female. 30 mg/kg of crystal form A of compound II and compound I were administrated orally by gavage once a day separately.
[0201] In the above plasma sample, protein was precipitated by acetonitrile, the supernatant was diluted 3 times with water, and 5 μL was detected by LC-MS/MS, the results of experiment was shown in table 10:
TABLE-US-00010 TABLE 10 the results of pharmacokinetic experiment Mode of Doses compound administration (mg/kg) AUC.sub.last(h*ng/mL) compound I PO 30 27670 crystal form A PO 30 47032 of compound II
[0202] As shown in the table above, compared with to the compound I, the crystal form A of compound II was better absorbed in vivo.
Example 8 CDK4/6 Inhibition Assay of the Compound I
[0203] To demonstrate that the compounds exhibit affinity for CDK kinases (CDK4/CycD3, CDK6/cycD3), CDKkinases assays were performed.
[0204] Reaction buffers were prepared as follows: kinase base buffer for CDK6 (50 mM HEPES, pH7.5; 0.0015% Brij-35; 10 mM MgCl.sub.2; 2 mM DTT); Kinase base buffer for CDK4 (20 mM HEPES, pH7.5; 0.01% Triton X-100; 10 mM MgCl.sub.2; 2 mM DTT); Stop buffer (100 mM HEPES, pH7.5; 0.015% Brij-35; 0.2% Coating Reagent #3; 50 mM EDTA)
[0205] Enzyme Reaction Protocol:
[0206] 1) Dilute the compound to 50× of the final desired highest concentration in reaction by 100% DMSO. Transfer 100 μL of this compound dilution to a well in a 96-well plate. Then, serially dilute the compound by transferring 30 μL to 60 μL of 100% DMSO in the next well and so forth for a total of 10 concentrations. Add 100 μL of 100% DMSO to two empty wells for no compound control and no enzyme control in the same 96-well plate. Mark the plate as source plate.
[0207] 2) Prepare intermediate plate by transferring 10 μL of compound from source plate to a new 96-well plate containing 90 μL of kinase buffer as the intermediate plate.
[0208] 3) Transfer 5 μL of compound from the 96-well intermediate plate to a 384-well plate in duplicates.
[0209] 4) Add 10 μL of 2.5× enzyme solution to each well of the 384-well assay plate.
[0210] 5) Incubate at room temperature for 10 min.
[0211] 6) Add 10 μL of 2.5× substrate solution prepared by adding FAM-labeled peptide and ATP in the kinase base buffer. Reaction concentrations for enzymes and substrates as following table (table 11):
TABLE-US-00011 TABLE 11 Reaction concentration of enzyme and substrate Peptide Enzyme Enzyme(nM) ATP (μM) Peptide concentration(μM) CDK4 10 280 P8 3 CDK6 15 800 P8 3
[0212] 7) Incubate at 28° C. for specified period of time.
[0213] 8) Add 25 μL of stop buffer to stop reaction.
[0214] 9) Collect data on Caliper. Then convert conversion values to inhibition values.
Percent inhibition=(max−conversion)/(max−min)*100 [0215] “max” stands for DMSO control; “min” stands for low control herein.
[0216] 10) Curve fitting using percent inhibition in XLFit excel add-in version 4.3.1 to obtain IC.sub.50 values. Equation used is: Y=Bottom+(Top−Bottom)/(1+(IC.sub.50/X){circumflex over ( )}HillSlope).
[0217] The results are expressed as IC.sub.50 value which is shown in table 12.
TABLE-US-00012 TABLE 12 CDK4/6 inhibitory activity assay results Sample IC.sub.50(CDK4)/nM IC.sub.50(CDK6)/nM LY2835219 2 22 compound I 1.9 22
Example 9 Inhibitory Activity and Selectivity Test on Other Subtypes of CDK Kinase at Molecular Level
[0218] Compound I was used as a test compound, and compared with the positive control drug (Abemaciclib) to compare CDK kinase inhibitory activity and selective specificity between them.
[0219] The mechanism of this method is shown in formula (IV). The kinase catalyzes the phosphorylation of the protein substrate to label the .sup.33P on the .sup.33P-labeled ATP (γ-.sup.33P-ATP) to the protein substrate in the reaction system, the reaction system was spotted on P81 ion-exchange membrane, and the membrane was washed extensively with 0.75% phosphate buffer; the radioactively-phosphorylated substrate was left on the membrane, and the kinase activity was reflected by recording the intensity of the substrate protein radiolabel.
##STR00007##
[0220] Data was processed with Prism4 Software (GraphPad), and the curve fitting formula was:
[0221] Y=Bottom+(Top−Bottom)/(1+10{circumflex over ( )}((Log IC.sub.50−X)*HillSlope)); wherein, Y is percent inhibition (%); X is logarithm of concentration of the inhibitor.
[0222] Results: Through the screening of various CDK kinases, it was found that the compound I have an IC.sub.50 of greater than 0.4 μM for inhibiting CDK1/2/7/9, which is tens to thousands of fold higher than that of CDK4/6 (See table 13).
TABLE-US-00013 TABLE 13 CDK kinase inhibitory activity IC.sub.50(nM) Kinases LY2835219 compound 2b CDK1/cyclin B 308 1683 CDK2/cyclin E 90 441 CDK7/cyclin H 2071 664 CDK9/cyclin T1 111 649
[0223] Conclusion: At the molecular level, the compound I of the present invention showed strong inhibitory effect on CDK4/6, and weak inhibitory effect on CDK1/2/7/9, indicating that the compound I is a CDK4/6 kinase inhibitor with excellent selectivity. In addition, the selectivity of compound I between CDK1/2/9 and CDK4/6 was significantly higher than that of LY2835219 (Abemaciclib).
Example 10 Tumor Regression Effect on JeKo-1 Xenograft Animal Model
[0224] JeKo-1 cells were cultured in RPMI 1640 medium containing 20% fetal bovine serum. Exponentially growing JeKo-1 cells were collected and resuspended in PBS to a suitable concentration for NOD/SCID mice subcutaneous tumor inoculation. 70 female mice were inoculated subcutaneously on the right with 5×10.sup.6 JeKo-1 cells, resuspended in PBS and matrigel (1:1). When the average tumor volume reached 134 mm.sup.3, the mice were randomly grouped according to the size of the tumor and were administrated. 48 mice were divided into the experimental group, and the remaining 22 mice were not used for experiment. Tumor volume is calculated as: long diameter×short diameter.sup.2/2. The test was divided into solvent control group, test drug representative compound I (10 mg/kg), test drug representative compound 1 (25 mg/kg), test drug representative compound 1 (50 mg/kg), test drug representative compound 1 (100 mg/kg), a total of 6 groups with each of 8 mice, and the mice were administered orally by gavage once a day and then continuous administration for 19 days. Efficacy is evaluated according to the relative tumor growth inhibition rate of TGI, the results was shown in table 14.
[0225] The calculation formula is as follows: TGI (%)=(C−T)/C×100% (C and T are the average tumor weight of the solvent control group and the average tumor weight of the treatment group, respectively). The higher the TGI (%) value illustrates the better the potency; and vice versa.
[0226] Results: compound I demonstrates excellent anti-tumor activity.
TABLE-US-00014 TABLE 14 Anti-tumor efficacy evaluation of representative compound I on JeKo-1 xenograft model Dose Relative tumor growth Group (mg/kg) inhibition rate TGI(%) pValue.sup.a Solvent control — — — compound I 10 42.7 0.087 compound I 25 73.8 0.003 compound I 50 98.3 0.001 compound I 100 104.5 0.001 Note: .sup.ap value is the comparative analysis of tumor volume for the treatment group and the solvent control group.