WO2015067539A1 - Process and intermediates for the preparation of linagliptin - Google Patents
Process and intermediates for the preparation of linagliptin Download PDFInfo
- Publication number
- WO2015067539A1 WO2015067539A1 PCT/EP2014/073478 EP2014073478W WO2015067539A1 WO 2015067539 A1 WO2015067539 A1 WO 2015067539A1 EP 2014073478 W EP2014073478 W EP 2014073478W WO 2015067539 A1 WO2015067539 A1 WO 2015067539A1
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- Prior art keywords
- formula
- group
- compound
- viii
- potassium
- Prior art date
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- LTXREWYXXSTFRX-QGZVFWFLSA-N Linagliptin Chemical compound N=1C=2N(C)C(=O)N(CC=3N=C4C=CC=CC4=C(C)N=3)C(=O)C=2N(CC#CC)C=1N1CCC[C@@H](N)C1 LTXREWYXXSTFRX-QGZVFWFLSA-N 0.000 title claims abstract description 31
- 229960002397 linagliptin Drugs 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000008569 process Effects 0.000 title claims abstract description 25
- 239000000543 intermediate Substances 0.000 title abstract description 34
- 238000002360 preparation method Methods 0.000 title abstract description 4
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 26
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 26
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 67
- 238000006243 chemical reaction Methods 0.000 claims description 52
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 claims description 51
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 42
- 150000001875 compounds Chemical class 0.000 claims description 41
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 claims description 33
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 30
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 30
- 239000002798 polar solvent Substances 0.000 claims description 28
- 229960001760 dimethyl sulfoxide Drugs 0.000 claims description 25
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 24
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 24
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 21
- 239000003054 catalyst Substances 0.000 claims description 18
- FVAUCKIRQBBSSJ-UHFFFAOYSA-M sodium iodide Chemical compound [Na+].[I-] FVAUCKIRQBBSSJ-UHFFFAOYSA-M 0.000 claims description 18
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 16
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 claims description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 11
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 7
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 claims description 6
- GBRBMTNGQBKBQE-UHFFFAOYSA-L copper;diiodide Chemical compound I[Cu]I GBRBMTNGQBKBQE-UHFFFAOYSA-L 0.000 claims description 6
- UAOMVDZJSHZZME-UHFFFAOYSA-N diisopropylamine Chemical compound CC(C)NC(C)C UAOMVDZJSHZZME-UHFFFAOYSA-N 0.000 claims description 6
- 235000009518 sodium iodide Nutrition 0.000 claims description 6
- HEQOJEGTZCTHCF-UHFFFAOYSA-N 2-amino-1-phenylethanone Chemical compound NCC(=O)C1=CC=CC=C1 HEQOJEGTZCTHCF-UHFFFAOYSA-N 0.000 claims description 5
- LPNYRYFBWFDTMA-UHFFFAOYSA-N potassium tert-butoxide Chemical compound [K+].CC(C)(C)[O-] LPNYRYFBWFDTMA-UHFFFAOYSA-N 0.000 claims description 5
- DPKBAXPHAYBPRL-UHFFFAOYSA-M tetrabutylazanium;iodide Chemical compound [I-].CCCC[N+](CCCC)(CCCC)CCCC DPKBAXPHAYBPRL-UHFFFAOYSA-M 0.000 claims description 5
- RENMDAKOXSCIGH-UHFFFAOYSA-N Chloroacetonitrile Chemical compound ClCC#N RENMDAKOXSCIGH-UHFFFAOYSA-N 0.000 claims description 4
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 4
- JGFZNNIVVJXRND-UHFFFAOYSA-N N,N-Diisopropylethylamine (DIPEA) Chemical compound CCN(C(C)C)C(C)C JGFZNNIVVJXRND-UHFFFAOYSA-N 0.000 claims description 4
- IMFACGCPASFAPR-UHFFFAOYSA-N tributylamine Chemical compound CCCCN(CCCC)CCCC IMFACGCPASFAPR-UHFFFAOYSA-N 0.000 claims description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 3
- 239000000460 chlorine Substances 0.000 claims description 3
- 229910052801 chlorine Inorganic materials 0.000 claims description 3
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 2
- KEAYESYHFKHZAL-UHFFFAOYSA-N Sodium Chemical compound [Na] KEAYESYHFKHZAL-UHFFFAOYSA-N 0.000 claims description 2
- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 claims description 2
- 229940043279 diisopropylamine Drugs 0.000 claims description 2
- 150000007529 inorganic bases Chemical class 0.000 claims description 2
- PSHKMPUSSFXUIA-UHFFFAOYSA-N n,n-dimethylpyridin-2-amine Chemical compound CN(C)C1=CC=CC=N1 PSHKMPUSSFXUIA-UHFFFAOYSA-N 0.000 claims description 2
- 150000007530 organic bases Chemical class 0.000 claims description 2
- ODZPKZBBUMBTMG-UHFFFAOYSA-N sodium amide Chemical compound [NH2-].[Na+] ODZPKZBBUMBTMG-UHFFFAOYSA-N 0.000 claims description 2
- 239000012312 sodium hydride Substances 0.000 claims description 2
- 229910000104 sodium hydride Inorganic materials 0.000 claims description 2
- MFRIHAYPQRLWNB-UHFFFAOYSA-N sodium tert-butoxide Chemical compound [Na+].CC(C)(C)[O-] MFRIHAYPQRLWNB-UHFFFAOYSA-N 0.000 claims description 2
- 150000003512 tertiary amines Chemical class 0.000 claims description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims 1
- NGSGKOBENCHFIK-UHFFFAOYSA-L [I-].[K+].[I-].C(CCC)[N+](CCCC)(CCCC)CCCC Chemical compound [I-].[K+].[I-].C(CCC)[N+](CCCC)(CCCC)CCCC NGSGKOBENCHFIK-UHFFFAOYSA-L 0.000 claims 1
- 125000005843 halogen group Chemical group 0.000 claims 1
- 239000011734 sodium Substances 0.000 claims 1
- 229910052708 sodium Inorganic materials 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 16
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 15
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 13
- 239000011541 reaction mixture Substances 0.000 description 13
- LKLQWOKKPWCIAW-UHFFFAOYSA-N piperidin-3-yl carbamate Chemical compound NC(=O)OC1CCCNC1 LKLQWOKKPWCIAW-UHFFFAOYSA-N 0.000 description 10
- NOESYZHRGYRDHS-UHFFFAOYSA-N insulin Chemical compound N1C(=O)C(NC(=O)C(CCC(N)=O)NC(=O)C(CCC(O)=O)NC(=O)C(C(C)C)NC(=O)C(NC(=O)CN)C(C)CC)CSSCC(C(NC(CO)C(=O)NC(CC(C)C)C(=O)NC(CC=2C=CC(O)=CC=2)C(=O)NC(CCC(N)=O)C(=O)NC(CC(C)C)C(=O)NC(CCC(O)=O)C(=O)NC(CC(N)=O)C(=O)NC(CC=2C=CC(O)=CC=2)C(=O)NC(CSSCC(NC(=O)C(C(C)C)NC(=O)C(CC(C)C)NC(=O)C(CC=2C=CC(O)=CC=2)NC(=O)C(CC(C)C)NC(=O)C(C)NC(=O)C(CCC(O)=O)NC(=O)C(C(C)C)NC(=O)C(CC(C)C)NC(=O)C(CC=2NC=NC=2)NC(=O)C(CO)NC(=O)CNC2=O)C(=O)NCC(=O)NC(CCC(O)=O)C(=O)NC(CCCNC(N)=N)C(=O)NCC(=O)NC(CC=3C=CC=CC=3)C(=O)NC(CC=3C=CC=CC=3)C(=O)NC(CC=3C=CC(O)=CC=3)C(=O)NC(C(C)O)C(=O)N3C(CCC3)C(=O)NC(CCCCN)C(=O)NC(C)C(O)=O)C(=O)NC(CC(N)=O)C(O)=O)=O)NC(=O)C(C(C)CC)NC(=O)C(CO)NC(=O)C(C(C)O)NC(=O)C1CSSCC2NC(=O)C(CC(C)C)NC(=O)C(NC(=O)C(CCC(N)=O)NC(=O)C(CC(N)=O)NC(=O)C(NC(=O)C(N)CC=1C=CC=CC=1)C(C)C)CC1=CN=CN1 NOESYZHRGYRDHS-UHFFFAOYSA-N 0.000 description 8
- 238000005160 1H NMR spectroscopy Methods 0.000 description 7
- 239000007787 solid Substances 0.000 description 7
- -1 4-methylquinazolin-2-yl Chemical group 0.000 description 6
- 101800000224 Glucagon-like peptide 1 Proteins 0.000 description 6
- DTHNMHAUYICORS-KTKZVXAJSA-N Glucagon-like peptide 1 Chemical compound C([C@@H](C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](C)C(=O)N[C@@H](CC=1C2=CC=CC=C2NC=1)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](C(C)C)C(=O)N[C@@H](CCCCN)C(=O)NCC(=O)N[C@@H](CCCNC(N)=N)C(N)=O)NC(=O)[C@H](CCC(O)=O)NC(=O)[C@H](CCCCN)NC(=O)[C@H](C)NC(=O)[C@H](C)NC(=O)[C@H](CCC(N)=O)NC(=O)CNC(=O)[C@H](CCC(O)=O)NC(=O)[C@H](CC(C)C)NC(=O)[C@H](CC=1C=CC(O)=CC=1)NC(=O)[C@H](CO)NC(=O)[C@H](CO)NC(=O)[C@@H](NC(=O)[C@H](CC(O)=O)NC(=O)[C@H](CO)NC(=O)[C@@H](NC(=O)[C@H](CC=1C=CC=CC=1)NC(=O)[C@@H](NC(=O)CNC(=O)[C@H](CCC(O)=O)NC(=O)[C@H](C)NC(=O)[C@@H](N)CC=1N=CNC=1)[C@@H](C)O)[C@@H](C)O)C(C)C)C1=CC=CC=C1 DTHNMHAUYICORS-KTKZVXAJSA-N 0.000 description 6
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- 0 Cc1nc(CN(C(c([n]2C=C)c(N3C)nc2N2CC(*)CCC2)=O)C3=O)nc2c1cccc2 Chemical compound Cc1nc(CN(C(c([n]2C=C)c(N3C)nc2N2CC(*)CCC2)=O)C3=O)nc2c1cccc2 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 3
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- UHCUBOJGMLASBY-UHFFFAOYSA-N 2-(chloromethyl)-4-methylquinazoline Chemical compound C1=CC=C2C(C)=NC(CCl)=NC2=C1 UHCUBOJGMLASBY-UHFFFAOYSA-N 0.000 description 2
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- QKVGEDAFLZSFGA-UHFFFAOYSA-N CC(Cl)=CCn1c(Br)nc2n(C)c(=O)n(CC#N)c(=O)c12 Chemical compound CC(Cl)=CCn1c(Br)nc2n(C)c(=O)n(CC#N)c(=O)c12 QKVGEDAFLZSFGA-UHFFFAOYSA-N 0.000 description 2
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- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- WABXPPMHYFWWAW-MRVPVSSYSA-N [(3r)-1-propan-2-ylpiperidin-3-yl] carbamate Chemical compound CC(C)N1CCC[C@@H](OC(N)=O)C1 WABXPPMHYFWWAW-MRVPVSSYSA-N 0.000 description 2
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- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000002218 hypoglycaemic effect Effects 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000000492 insulin antagonist Substances 0.000 description 1
- 230000003914 insulin secretion Effects 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 210000004185 liver Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 235000012054 meals Nutrition 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004899 motility Effects 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 210000002571 pancreatic alpha cell Anatomy 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229960005235 piperonyl butoxide Drugs 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 108090000765 processed proteins & peptides Proteins 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- MBECHBYCMVYJDQ-MRVPVSSYSA-N propan-2-yl N-[(3R)-piperidin-3-yl]carbamate Chemical compound CC(C)OC(=O)N[C@@H]1CCCNC1 MBECHBYCMVYJDQ-MRVPVSSYSA-N 0.000 description 1
- 239000003586 protic polar solvent Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000010517 secondary reaction Methods 0.000 description 1
- 230000028327 secretion Effects 0.000 description 1
- 230000004936 stimulating effect Effects 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 229940049667 tradjenta Drugs 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 208000001072 type 2 diabetes mellitus Diseases 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D473/00—Heterocyclic compounds containing purine ring systems
- C07D473/02—Heterocyclic compounds containing purine ring systems with oxygen, sulphur, or nitrogen atoms directly attached in positions 2 and 6
- C07D473/04—Heterocyclic compounds containing purine ring systems with oxygen, sulphur, or nitrogen atoms directly attached in positions 2 and 6 two oxygen atoms
Definitions
- the present invention relates to a process for the synthesis of Linagliptin and intermediates useful for its preparation.
- Linagliptin is a reversible and competitive inhibitor of dipeptidyl-peptidases 4 (DPP- 4), enzymes that degrade the incretin hormones, which is used in adults suffering from diabetes mellitus type 2 (non-insulin dependent diabetes) to improve the control of blood glucose levels.
- DPP- 4 dipeptidyl-peptidases 4
- Incretins are hormones produced in the gastrointestinal region and they are mainly GLP-1 (Glucagon-Like Peptide 1 ) and GIP (Glucosedependent Insulinotropic Peptide). They are secreted after meals, particularly GLP-1 , and have the function of controlling glycemia in different ways: increase of insulin secretion by pancreatic beta cells, decrease of glucagon secretion (insulin antagonist) by pancreatic alpha cells, slowdown of motility and of gastric empty with the consequent decrease in appetite.
- GLP-1 Glucagon-Like Peptide 1
- GIP Glucosedependent Insulinotropic Peptide
- GLP-1 is rapidly degraded into an inactive peptide by DDP-4, moreover its production decreases when glycemia decreases, its control over the latter is then calibrated and "when needed” thus avoiding hypersecretion of insulin and consequent dangerous hypoglycemia.
- GLP-1 In diabetic patients, the natural action of GLP-1 is defective, it was therefore thought to restore such activity for exploiting it, particularly for the oral therapy of diabetes mellitus type 2, a disorder in which pancreas is not able to produce enough insulin to control blood glucose levels or in which the body is not able to effectively use insulin with the consequent advantage of decreasing the various and problematic side effects due to a prolonged oral therapy with the traditional drugs.
- Linagliptin acting as DPP-4 inhibitor, inhibits the degradation of incretin hormones in the body, particularly GLP-1 , increasing their blood level and stimulating the pancreas to produce more insulin when there is a high glycemic level, thus decreasing the amount of glucose produced by the liver, it also decreases glucagone levels, allowing the control of diabetes mellitus type 2.
- Linagliptin is a compound of formula (I)
- Z represents a leaving group such as for example an halogen, an hydroxyl group, a mercapto group or other commonly known groups.
- Z represents a leaving group such as for example an halogen, an hydroxyl group, a mercapto group or other commonly known groups.
- EP 2 468 749 discloses processes for the synthesis of Linagliptin which comprise a Lossen or Curtius rearrangement of the following compounds into Linagliptin:
- X represents an hydrogen or a hydroxyl Ci-C 8 alkyl, Ci-C 4 alkoxy, aryl, amine, N 3 group or an halogen.
- R represents a COOR 1 group or a NHCOOR 1 group, wherein R-i represents a linear or branched Ci-C 6 alkyl group;
- the catalyst is preferably selected among potassium iodide, tetrabutylammonium iodide, sodium iodide, copper iodide, potassium iodide being more preferably used, and the base is preferably selected among sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, potassium carbonate being more preferably used.
- the aprotic polar solvent is preferably selected among dimethylsulphoxide, acetonitrile, dimethylformamide, dimethylacetamide or mixtures thereof. Dimethylsulphoxide is preferably used.
- the step e) of the process object of the present invention is preferably carried out in the presence of diphenylphosphorylazide and a tertiary amine preferably selected among triethylamine, tributylamine, diisopropylethylamine, N,N- dimethylaminopyridine and a suitable linear or branched Ci-C 4 alcohol preferably selected among methanol, ethanol, isopropanol, ter-butanol.
- diphenylphosphorylazide and a tertiary amine preferably selected among triethylamine, tributylamine, diisopropylethylamine, N,N- dimethylaminopyridine and a suitable linear or branched Ci-C 4 alcohol preferably selected among methanol, ethanol, isopropanol, ter-butanol.
- the bases are preferably selected among sodium terbutoxide, potassium terbutoxide, sodium hydride, sodium amide. Potassium terbutoxide is preferably used.
- the intermediate (VI) can be obtained through a process which comprises:
- a further object of the present invention is a process for the synthesis of Linagliptin which comprises:
- an organic or inorganic base is used preferably selected among triethylamine, tributylamine, diisopropylamine, sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate.
- Triethylamine is preferably used.
- the aprotic polar solvent is selected preferably among dimethylsulphoxide, acetonitrile, dimethylformamide, dimethylacetamide or mixtures thereof. Dimethylsulphoxide is preferably used.
- the catalyst used is preferably selected among potassium iodide, tetrabutylammonium iodide, sodium iodide, copper iodide, potassium iodide being more preferred and the base is preferably selected among sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, potassium carbonate being more preferred and the aprotic polar solvent is preferably selected among dimethylsulphoxide, acetonitrile, dimethylformamide, dimethylacetamide or mixtures thereof. Dimethylsulphoxide is more preferably used.
- the intermediate of formula (VI) can be obtained through a process of synthesis which comprises:
- a further object of the present invention is a process for the synthesis of Linagliptin which comprises:
- R represents a group COOR 1 or a group NHCOOR 1 wherein R-i represents a linear or branched CrC 6 alkyl group;
- the catalyst is preferably selected among potassium iodide, tetrabutylammonium iodide, sodium iodide, copper iodide, potassium iodide being more preferably used.
- the base is preferably selected among sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, potassium carbonate being more preferably used.
- the aprotic polar solvent is preferably selected among dimethylsulfoxide, acetonitrile, dimethylformamide, dimethylacetamide or mixtures of thereof.
- Dimethylsulfoxide is preferably used.
- a preferred practical embodiment of the process object of the present invention is the following.
- the compound (II) is reacted with the compound (III) in the presence of triethylamine in dimethylsulphoxide at about 50°C, to give the compound (IV) which is subsequently reacted with 2-(chloromethyl)-4-methylquinazoline in dimethylsulphoxide in the presence of potassium carbonate and potassium iodide at about 60°C to give the compound (IV).
- polar solvent refers to a solvent which is a proton donor, such as water; an alcohol, for example methanol, ethanol, propanol, /so-propanol, butanol; or a polarized solvent, such as for example esters, for example, ethyl acetate, butyl acetate; nitriles, for example acetonitrile; ethers, for example, tetrahydrofuran, dioxane; ketones, for example acetone, methylbutylketone and the like.
- esters for example, ethyl acetate, butyl acetate
- nitriles for example acetonitrile
- ethers for example, tetrahydrofuran, dioxane
- ketones for example acetone, methylbutylketone and the like.
- non polar or polar, protic or aprotic solvents can be found in organic chemistry books or in specialized monographs, for example: Organic Solvents Physical Properties and Methods of Purification, 4th ed., John A. Riddick, et al., Vol. II, in "Techniques of Chemistry Series", John Wiley & Sons, NY, 1986.
- solvents are known to the person skilled in the art and it is moreover clear to the person skilled in the art that different solvents or mixtures thereof can be preferred.
Abstract
The present invention relates to a process for the synthesis of Linagliptin and intermediates useful for its preparation.
Description
PROCESS AND INTERMEDIATES FOR THE PREPARATION OF LINAGLIPTIN
The present invention relates to a process for the synthesis of Linagliptin and intermediates useful for its preparation.
Linagliptin is a reversible and competitive inhibitor of dipeptidyl-peptidases 4 (DPP- 4), enzymes that degrade the incretin hormones, which is used in adults suffering from diabetes mellitus type 2 (non-insulin dependent diabetes) to improve the control of blood glucose levels.
Incretins are hormones produced in the gastrointestinal region and they are mainly GLP-1 (Glucagon-Like Peptide 1 ) and GIP (Glucosedependent Insulinotropic Peptide). They are secreted after meals, particularly GLP-1 , and have the function of controlling glycemia in different ways: increase of insulin secretion by pancreatic beta cells, decrease of glucagon secretion (insulin antagonist) by pancreatic alpha cells, slowdown of motility and of gastric empty with the consequent decrease in appetite.
GLP-1 is rapidly degraded into an inactive peptide by DDP-4, moreover its production decreases when glycemia decreases, its control over the latter is then calibrated and "when needed" thus avoiding hypersecretion of insulin and consequent dangerous hypoglycemia.
In diabetic patients, the natural action of GLP-1 is defective, it was therefore thought to restore such activity for exploiting it, particularly for the oral therapy of diabetes mellitus type 2, a disorder in which pancreas is not able to produce enough insulin to control blood glucose levels or in which the body is not able to effectively use insulin with the consequent advantage of decreasing the various and problematic side effects due to a prolonged oral therapy with the traditional drugs.
Linagliptin, acting as DPP-4 inhibitor, inhibits the degradation of incretin hormones in the body, particularly GLP-1 , increasing their blood level and stimulating the pancreas to produce more insulin when there is a high glycemic level, thus decreasing the amount of glucose produced by the liver, it also decreases glucagone levels, allowing the control of diabetes mellitus type 2.
chemically known as 8-[3(R)-aminopiperidin-1 -yl]-7-(2-butynyl)-3-methyl-1 -(4- methylquinazolin-2-ylmethyl)xantine, disclosed in US 7,407,955 and commercially available under the name Tradjenta®.
There are different methods for the synthesis of Linagliptin known in literature.
US 7,407,955 discloses the following processes for the synthesis of Linagliptin:
wherein Z represents a leaving group such as for example an halogen, an hydroxyl group, a mercapto group or other commonly known groups.
US 7,820,815 discloses the following process for the synthesis of Linagliptin
(I)
wherein Z represents a leaving group such as for example an halogen, an hydroxyl group, a mercapto group or other commonly known groups.
EP 2 468 749 discloses processes for the synthesis of Linagliptin which comprise a Lossen or Curtius rearrangement of the following compounds into Linagliptin:
wherein X represents an hydrogen or a hydroxyl Ci-C8 alkyl, Ci-C4 alkoxy, aryl, amine, N3 group or an halogen.
We have now found a process for the synthesis of Linagliptin that, by the introduction of the alkyl group in a masked form, allows a decrease of the secondary reactions and the obtainment of Linagliptin and its intermediates with high yields and high purities.
It is therefore object of the present invention a process for the synthesis of Linagliptin which comprises:
d) the reaction of the intermediate of formula (VI)
wherein R represents a COOR1 group or a NHCOOR1 group, wherein R-i represents a linear or branched Ci-C6 alkyl group;
in the presence of a catalyst and a base, in an aprotic polar solvent, to give the intermediate of formula (VIII)
e) the optional conversion of the intermediate (VIII) wherein R represents a COOR1 group into the intermediate (VIII) wherein R represents a NHCOOR1 group;
f) the conversion into Linagliptin of the compound (VIII) wherein R represents a NHCOOR1 group, by treatment with bases;
In step d) of the process object of the present invention the catalyst is preferably selected among potassium iodide, tetrabutylammonium iodide, sodium iodide, copper iodide, potassium iodide being more preferably used, and the base is preferably selected among sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, potassium carbonate being more preferably used.
ln step d) the aprotic polar solvent is preferably selected among dimethylsulphoxide, acetonitrile, dimethylformamide, dimethylacetamide or mixtures thereof. Dimethylsulphoxide is preferably used.
The step e) of the process object of the present invention is preferably carried out in the presence of diphenylphosphorylazide and a tertiary amine preferably selected among triethylamine, tributylamine, diisopropylethylamine, N,N- dimethylaminopyridine and a suitable linear or branched Ci-C4 alcohol preferably selected among methanol, ethanol, isopropanol, ter-butanol.
In step f) of the process object of the present invention the bases are preferably selected among sodium terbutoxide, potassium terbutoxide, sodium hydride, sodium amide. Potassium terbutoxide is preferably used.
The intermediate (VI) can be obtained through a process which comprises:
a) the reaction of the compound of formula (II)
to give the intermediate of formula (IV)
b) the reaction of the intermediate of formula (IV) with a compound of formula (V)
wherein X represents a halogen, preferably chlorine, in the presence of a catalyst and a base, in an aprotic polar solvent, to give the intermediate of formula (VI).
Then a further object of the present invention is a process for the synthesis of Linagliptin which comprises:
a) the reaction of the compound of formula (II)
with a compound of formula (III), in the presence of a base, in an aprotic polar solvent
W ON)
CH3
to give the intermediate of formula (IV)
CH3
wherein X represents an halogen, preferably chlorine, in the presence of a catalyst and a base, in an aprotic polar solvent, to give the intermediate of formula (VI)
d) the reaction of the intermediate of formula (VI) with a compound of formula (VII)
wherein R represents a COOR1 group or a NHCOOR1 group, wherein R-i represents a linear or branched Ci-C6 alkyl group,
in the presence of a catalyst and a base, in an aprotic polar solvent, to give the intermediate of formula (VIII)
e) the optional conversion of the intermediate (VIII) wherein R represents a
COOR1 group into the intermediate (VIII) wherein R represents a NHCOOR1 group;
f) the conversion into Linagliptin of the compound (VIII) wherein R represents a
NHCOORi group, by treatment with bases.
In step a) of the process object of the present invention an organic or inorganic base is used preferably selected among triethylamine, tributylamine, diisopropylamine, sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate. Triethylamine is preferably used.
The aprotic polar solvent is selected preferably among dimethylsulphoxide, acetonitrile, dimethylformamide, dimethylacetamide or mixtures thereof. Dimethylsulphoxide is preferably used.
In step b) of the process object of the present invention the catalyst used is preferably selected among potassium iodide, tetrabutylammonium iodide, sodium iodide, copper iodide, potassium iodide being more preferred and the base is preferably selected among sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, potassium carbonate being more preferred and the aprotic polar solvent is preferably selected among dimethylsulphoxide, acetonitrile, dimethylformamide, dimethylacetamide or mixtures thereof. Dimethylsulphoxide is more preferably used.
Alternatively, the intermediate of formula (VI) can be obtained through a process of synthesis which comprises:
a) the reaction of the compound of formula (II)
with a compound of formula (III), in the presence of a base, in an aprotic polar solvent
to give the intermediate of formula (IV)
b') the reaction of the compound of formula (IV) with chloroacetonitrile, in the presence of a catalyst and a base in an aprotic polar solvent, to give the intermediate of formula (IX)
the reaction of the intermediate of formula (IX) with aminoacetophenone in the presence of anhydrous hydrochloric acid 1 ,4-dioxane, to give the intermediate of formula (VI).
Then a further object of the present invention is a process for the synthesis of Linagliptin which comprises:
a) the reaction of the compound of formula (II)
with a compound of formula (III), in the presence of a base, in an aprotic polar solvent
to give the intermediate of formula (IV)
b') the reaction of the compound of formula (IV) with chloroacetonitrile, in the presence of a catalyst and a base, in an aprotic polar solvent, to give the intermediate of formula (IX)
the reaction of the intermediate of formula (IX) with aminoacetophenone in the presence of anhydrous hydrochloric acid 1 .4-dioxane, to give the intermediate of formula (VI)
wherein R represents a group COOR1 or a group NHCOOR1 wherein R-i represents a linear or branched CrC6 alkyl group;
in the presence of a catalyst and a base, in an aprotic polar solvent, to give the intermediate of formula (VIII)
wherein R has the above reported meanings;
e) the optional transformation of the intermediate (VIII) wherein R represents a COOR1 group into the intermediate (VIII) wherein R represents a NHCOOR1 group;
f) the conversion into Linagliptin of the compound of formula (VIII) wherein R represents a NHCOOR1 group by treatment with bases.
In step b') the catalyst is preferably selected among potassium iodide, tetrabutylammonium iodide, sodium iodide, copper iodide, potassium iodide being more preferably used.
The base is preferably selected among sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, potassium carbonate being more preferably used.
The aprotic polar solvent is preferably selected among dimethylsulfoxide, acetonitrile, dimethylformamide, dimethylacetamide or mixtures of thereof. Dimethylsulfoxide is preferably used.
A preferred practical embodiment of the process object of the present invention is the following.
The compound (II) is reacted with the compound (III) in the presence of triethylamine in dimethylsulphoxide at about 50°C, to give the compound (IV) which is subsequently reacted with 2-(chloromethyl)-4-methylquinazoline in dimethylsulphoxide in the presence of potassium carbonate and potassium iodide at about 60°C to give the compound (IV). (R)-isopropyl-piperidine-3-yl carbamate in dimethylsulfoxide is reacted with the compound (VI) in the presence of potassium carbonate and potassium iodide to give (R)-isopropyl 1 -(7-(3-chlorobut-2-enyl)-3-methyl-1 -((4-methylquinazolin-2-yl)methyl-2,6- dioxo-2,3,6,7-tetrahydro-1 /-/-purin-8-yl)pyperidin-3-yl carbamate that is subsequently reacted in the presence of dimethylacetamide and potassium tert-butoxide to give (R)-isopropyl 1 -(7-(but-2-inyl)-3-methyl-1 -((4- methylquinazolin-2-yl)methyl -2,6 - dioxo - 2,3,6,7 - tetrahydro-1 H-purin-8- yl)piperidine-3-yl- carbamate which is converted into Linagliptin through hydrolysis in the presence of water, dimethylacetamide and potassium hydroxide.
The compounds of formula (IV), (VI), (VIII) and (IX) are new intermediates useful for the synthesis of Linagliptin and represent a further object of the present invention.
All the terms used in the present application, unless otherwise indicated, are to be understood in their common meaning as known in the art. Other more specific definitions for certain terms, as indicated in this patent application, are underlined later and are constantly applied for the whole description and the claims unless a different definition provides specifically a wider meaning. The term "polar solvent" refers to a solvent which is a proton donor, such as water; an alcohol, for example methanol, ethanol, propanol, /so-propanol, butanol; or a polarized solvent, such as for example esters, for example, ethyl acetate, butyl acetate; nitriles, for example acetonitrile; ethers, for example, tetrahydrofuran, dioxane; ketones, for example acetone, methylbutylketone and the like.
Further information about non polar or polar, protic or aprotic solvents can be found in organic chemistry books or in specialized monographs, for example: Organic Solvents Physical Properties and Methods of Purification, 4th ed., John A. Riddick, et al., Vol. II, in "Techniques of Chemistry Series", John
Wiley & Sons, NY, 1986. Such solvents are known to the person skilled in the art and it is moreover clear to the person skilled in the art that different solvents or mixtures thereof can be preferred.
Although the present invention has been described in its characterizing features, the equivalents and modifications obvious to the skilled in the art are included in the following invention.
The present invention will be now illustrated through some examples without limiting the scope of the invention.
EXAMPLES
EXAMPLE 1
Synthesis of 8-bromo-7-(3-chlorobut-2-enyl)-3-methyl-1 H-purin- 2,6(3H,7H)-dione.
8-bromo-3-methyl-1 H-purin-2,6-(3H,7Hj-dione (10.00 g, 41.00 mmol), dimethylsulphoxide (30 ml), triethylamine (6.25 ml_, 45.10 mmol) were charged into a reaction flask, the temperature was brought to about 50°C and 1 ,3-dichlorobutene (4.40 ml, 41.00 mmol) was charged. The reaction mixture was kept under such conditions for about one hour. At the end of the reaction, the resultant solid was filtered and dried in oven under vacuum at 50°C to give 12.10 g of 8-bromo-7-(3-chlorobut-2-enyl)-3-methyl-1 H-purin- 2,6(3H,7Hj-dione.
1H-NMR (DMSO, 300 MHz): δ 1 1 .32 (s, 1 H), δ 5.84 (t, 1 H), δ 4.98 (d, 2H), δ 3.33 (m, 3H), 6 2.50 (s, 1 H), 5 2.13 (s, 2H).
13C-NMR (DMSO, 300MHz): δ 154.54 (C), δ 151.1 1 (C), δ 149.87 (C), δ 133.77 (C), δ 128.16 (C), δ 121 .09 (CH), δ 109.18 (C), δ 46.00 (CH2), δ 29.10 (CH3), 6 26.16 (CH3).
EXAMPLE 2
Synthesis of 8-bromo-7-(3-chlorobut-2-enyl)-3-methyl-1 -((4-methyl quinazolin-2-yl)-methyl)-1 H-purin-2,6(3H,7H)-dione.
8-bromo-7-(3-chlorobut-2-enyl)-3-methyl-1 H-purin-2,6(3H, H)-dione (5.00 g, 14.98 mmol), dimethylsulphoxide (50 ml), potassium carbonate (2.07 g, 14.98 mmol), potassium iodide (0.25 g, 1.50 mmol) and 2-(chloromethyl)-4- methylquinazoline (2.89 g, 14.98 mmol) were charged into a reaction flask.
The temperature was brought to about 60°C and the reaction mixture was kept under such conditions for about 3 hours. At the end of the reaction, demineralized water (40 ml) was added and the resultant solid was filtered under vacuum and washed with demineralized water (1 x 20 ml) and dried in oven under vacuum at 50°C to give 6.43 g of 8-bromo-7-(3-chlorobut-2-enyl)-
3-methyl-1 -((4-methylquinazolin-2-yl)methyi -iH-pur/'n-2,6(3H H -c//'one. 1H-NMR (DMSO, 300 MHz): δ 8.04 (d, 1 H), δ 7.84 (d, 1 H), δ 7.78 (t, 1 H), δ 7.54 (t, 1 H), δ 5.70 (t, 1 H), δ 5.55 (s, 2H), δ 5.12 (d, 2H), δ 3.59 (s, 3H), δ
2.89 (s, 3H) 6 2.12 (s, 3H).
13C-NMR (DMSO, 300MHz): δ 168.74 (C), δ 160.54 (C), δ 154.26 (C), δ
151 .44 (C), δ 149.95 (C), δ 148.85 (CH), δ 134.88 (C), δ 133.44 (CH), δ 128.89 (CH), δ 127.64 (C), δ 126.92 (CH), δ 124.96 (CH), δ 123.22 (C), δ 1 19.63 (CH), δ 109.06 (C), δ 77.19 (CH2), δ 45.92 (CH2), δ 29.99 (CH3), δ 26.20 (CH3), δ 21 .87 (CH3).
EXAMPLE 3
Synthesis of (R)-isopropyl 1 -(7-(3-chlorobut-2-enyl)-3-methyl-1 -((4- methylquinazolin-2-yl)-methyl)-2,6-dioxo-2,3,6,7-tetrahydro- H-purin-8- yl)piperidin-3-yl carbamate
(R)-isopropyl-piperidin-3-ylcarbamate (0.92 g, 4.90 mmol), dimethylsulphoxide (10 ml) were charged into a reaction flask and keeping the reaction mixture under stirring, 8-bromo-7-(3-chlorobut-2-enyl) -3-methyl - 1 - ((4-methylquinazolin-2-yl)methyl) -1 H-purin-2,6(3H-7H)-dione (2.42 g,
4.90 mmol) and potassium carbonate (0.74 g, 5.39 mmol) were charged. The temperature was brought to about 80°C and potassium iodide in catalytic amounts was charged and the reaction mixture was kept under such conditions for 40 hours. At the end of the reaction, the temperature was brought to room temperature, demineralized water (15ml) was added and the resultant solid was filtered and washed with demineralized water (1 x 15 ml) and dried in oven under vacuum at 50°C to give 2.30 g of (R) -isopropyl 1 - (7-(3-chlorobut-2-enyl)-3-methyl-1 -((4-methylquinazolin-2-yl)-methyl)-2,6- dioxo-2,3,6,7-tetrahydro-7H-purin-8-yl)piperidin-3-yl carbamate.
1H-NMR (DMSO, 300 MHz): δ 7.99 (d, 1 H), δ 7.85 (d, 1 H), δ 7.75 (t, 1 H), δ 7.51 (t, 1 H), δ 5.84 (t, 1 H), δ 5.54 (s, 2H), δ 5.28 (s, 1 H), δ 4.88 (t, 1 H), δ
4.83 (d, 1 H) δ 3.89 (m, 1 H), δ 3.58 (m, 3H), δ 3.19 (m, 3 H), δ 2.88 (m, 3H), δ 2.14 (s, 2H), 6 2.10 (s, 3H), δ 1 .83 (m, 2H), δ 1 .73 (m, 2H), δ 1 .21 (d, 6H). 13C-NMR (DMSO, 300MHz): δ 168.63 (C), δ 161 .13 (C), δ 156.47 (C), δ 155.63 (C), δ 153.00 (C), δ 151 .92 (C), δ 150.03 (C), δ 149.00 (C), δ 133.33 (CH), δ 128.97 (CH), δ 126.81 (CH), δ 124.93 (CH), δ 123.25 (C), δ 121.45
(CH), δ 105.00 (C), δ 68.04 (CH), δ 54.69 (CH2), δ 51 .84 (CH2), δ 46.45 (CH), δ 46.34 (CH2), δ 44.58 (CH2), δ 44.46 (CH2), δ 29.85 (CH3), δ 29.80 (CH2), 6 26.17 (CH3), 6 22.17 (2 CH3), 6 21.85 (CH3).
EXAMPLE 4
Synthesis of (R)-ethyl 1 -i7-i3-clorobut-2-enyl)-3-methyl-1 -ii4-methyl quinazolin-2-yl)methyl)-2,6-dioxo-2,3,6,7-tetrahydro-1 H-purin-8- yl)piperidin-3-carboxylate.
(R)-ethyl-piperidin-3-carbossylate (0.29 g, 1.02 mmol), dimethylsulfoxide (5 ml) were charged into a reaction flask and, keeping the reaction mixture under stirring, potassium iodide in catalytic amounts, potassium carbonate
(0.14 g, 1 .02 mmol) and 8-bromo-7-(3-chlorobut-2-enyl)- 3 -methyl-1 -((4- methylquinazolin-2-yl)methyl)--/H-purin-2,6(3H, 7H)-dione (0.50 g, 1.02 mmol). The temperature was brought to about 60°C and maintaining under such conditions for about 15 hours. At the end of the reaction, the temperature was brought to room temperature and demineralized water
(5ml) was added. The resultant solid was filtered and washed with demineralized water (1 x 5 ml) and dried in oven under vacuum at 50°C to give 0.48 g of (R) -ethyl 1 -(7-(3-chlorobut-2-enyl)-3-methyl-1 -((4-methyl quinazolin-2-yl)methyl)-2,6-dioxo-2,3,6,7-tetrahydro-1 /-/-purin-8-yl)piperidin- 3-carboxylate.
1H-NMR (DMSO, 300 MHz): 6 7.98 (d, 1 H), 6 7.84 (d, 1 H), 6 7.74 (t, 1 H), 6 7.50 (t, 1 H), 6 5.87 (m, 1 H), 6 5.54 (s, 2H), 6 4.81 (d, 2H), 6 4.17 (m, 2H), 6 3.69 (m, 1 H) 6 3.55 (s, 3H), 6 3.43 (m, 1 H), 6 3.17 (m, 1 H), 6 3.00 (m, 1 H), 6 2.87 (s, 3H), 6 2.76 (m, 1 H), 6 2.09 (m, 4H), 6 1 .84 (m, 3H), 6 1.26 (t, 3H).
EXAMPLE 5
Synthesis of (R)-isopropyl 1 -(7-(but-2-inyl)-3-methyl-1 -((4- methylquinazolvn-2-yl)methyl)-2,6-dioxo-2,3,6,7-tetrahydro-1 H-purin-8- yl)piperidin-3-yl carbamate
(R)-isopropyl 1 -(7-(3-chlorobutyl-2-enyl)-3-methyl-1 -((4-methylquinazoline-2- yl)methyl-2,6-dioxo-2,3,6,7-tetrahydro-1 /-/-purin-8-yl)piperidin-3-yl carbamate (0.50 g, 0.84 mmol), dimethylacetamide (5 ml) were charged into a reaction flask under inert atmosphere, the temperature was brought to a temperature from 0°C to 5°C and, keeping the reaction mixture under stirring, potassium ie f-butoxide (0.16 g, 1 .70 mmol) was charged and the reaction mixture was kept under such conditions for about 13 hours. At the end of the reaction, demineralized water (5 ml) and toluene (5 ml) were added; the organic phase was reduced to residue by distillation under vacuum to give 0.32 g of (R)- isopropyl 1 -(7-(but-2-inyl)-3-methyl-1 -((4-methylquinazolin-2-yl)methyl)-2,6- dioxo-2,3,6,7-tetrahydro-1 H-purin-8-yl)piperidin-3-yl carbamate.
1H-NMR (DMSO, 300 MHz): δ 8.20 (d, 1 H), δ 7.86 (t, 1 H), δ 7.75 (d, 1 H), δ 7.65 (t, 1 H), δ 7.19 (d, 1 H), δ 5.30 (s, 2H), δ 4.86 (s, 2H), δ 4.75 (m, 2H), δ 3.65 (m, 3H) δ 3.38 (d, 2H), δ 3.00 (t, 1 H), δ 2.95 (s, 4H), δ 1.84 (m, 2H), δ 1 .80 (m, 3H), δ 1 .77 (m, 1 H), δ 1 .45 (m, 1 H), δ 1.15 (d, 6H).
13C-NMR (DMSO, 300MHz): δ 170.00 (C), δ 163.89 (C), δ 157 (C), δ 156.30 (C), δ 155.75 (C), δ 153.49 (C), δ 150 (C), δ 147.90 (C), δ 133.89 (CH), δ 129 (CH), δ 127.71 (CH), δ 126.29 (CH), δ 123.06 (C), δ 103.93 (CH), δ 81.65 (C), δ 75.00 (CH), δ 68.30 (CH), δ 53.00 (CH2), δ 50.00 (CH2), δ 47.25 (CH3), δ 45.00 (CH2), δ 33.70 (CH2), δ 32.17 (CH2), δ 30.00 (CH3), δ 23.69 (CH2), δ 22.61 (CH3), δ 22.61 (CH3), δ 3.63 (CH3).
EXAMPLE 6
Synthesis of Linagliptin
(R)-isopropyl 1 -(7-(but-2-inyl)-3-methyl-1 -((4-methylquinazolin-2-yl)methyl)- 2,6-dioxo-2,3,6,7-tetrahydro-1 /-/-purin-8-yl)piperidin-3-il carbamate (0.30 g, 0.55 mmol), dimethylacetamide (5ml) were charged into a reaction flask under inert atmosphere, the reaction mixture was brought to a temperature from 0°C to 5°C and under stirring, potassium hydroxide (0.032 g, 0.57 mmol) and water (3 ml) were charged. The temperature was brought to about 50°C and the reaction mixture was kept under such conditions for about 5 hours. At the end of the reaction demineralized water (5 ml) was added, the resultant solid was filtered and washed with demineralized water (1 x 5 ml) and dried in oven under vacuum at about 50°C to give 0.23 g of
Linagliptin.
EXAMPLE 7
Synthesis of 2-(8-bromo-7-(3-chlorobut-2-enyl)-3-methyl-2.6-dioxo- 2,3,6J-tetrahydro-7H-purin-1 -yl)acetonitrile
8-bromo-7-(chlorobut-2-enyl)-3-methyl-1 H-purin-2,6(3H, 7H -dione (1 .00 g,
3.00 mmol), dimethylsulfoxide (10 ml), potassium carbonate (0.46 g, 3.30 mmol), potassium iodide in catalytic amounts and 2-chloroacetonitrile (0.19 ml_, 3.00 mmol) were charged into a reaction flask. The temperature was brought to about 70°C and the reaction mixture was kept under such conditions for about three hours. At the end of the reaction, demineralized water (10 ml) and toluene (10 ml) were added; the aqueous phase was extracted with toluene (4 x 10 ml) and the collected organic phases were concentrated to residue through distillation under vacuum to give 1 .05 g of 2- (8-bromo-7-(3-chlorobut-2-enyl)-3-methyl-2,6-dioxo-2,3,6,7-tetrahydro-1 H- purin-1 -yl)acetonitrile.
1H-NMR (DMSO, 300 MHz): δ 5.66 (t, 1 H), δ 5.07 (d, 2H), δ 4.88 (s, 2H), δ 3.58 (s, 3H), 6 2.18 (s, 3H).
EXAMPLE 8
Synthesis of (R)-isopropyl 1 -(7-(3-chlorobut-2-enyl)-1 -(cianomethyl)-3- (methyl-2.6-dioxo-2,4,6,7-tetrahydro- H-purin-8-yl)piperidin-3-yl carbamate.
2-(8-bromo-7-(3-chlorobut-2-enyl)-3-methyl-2,6-dioxo-2,3,6,7-tetrahydro-1 H- purin-1 -yl)acetonitrile (1 g, 2.70 mmol), dimethylsulfoxide (10 ml), potassium carbonate (0.41 g, 3.00 mmol), (R)-isopropyl-piperidin-3-yl carbamate (0.50 g, 2.70 mmol) were charged into a reaction flask. The temperature was brought to about 70°C and the reaction mixture was kept under such conditions for about 5 hours. At the end of the reaction, demineralized water (5 ml) and toluene (5 ml) were added; the aqueous phase was extracted with toluene (3 x 5 ml) and the collected organic phases were concentrated to residue through distillation under vacuum to give 1 .37 g of (R)-isopropyl 1 - (7-(3-chlorobut-2-enyl)-1 -(cianomethyl)-3-(methyl-2,6-dioxo-2,4,6,7- tetrahydro-7/-/-purin-8-yl)piperidin-3-yl carbamate.
1H-NMR (DMSO, 300 MHz): δ 5.78 (t, 1 H), δ 5.56 (m, 1 H), δ 4.90 (s, 2H), δ
4.80 (d, 2H), δ 3.87 (s, 1 H), δ 3.48 (m, 4H), δ 3.18 (m, 3H), δ 2.20 (m, 3H), δ 1 .87 (m, 2H), δ 1.73 (m, 3H), δ 1 .23 (m, 6H).
13C-NMR (DMSO, 300MHz): δ 157.14 (C), δ 155.55 (C), δ 152.67 (C), δ 150.55 (C), δ 148.55 (C), δ 134.22 (C), δ 121.84 (CH), δ 1 15.18 (C), δ 104.32 (C), δ 68.14 (CH), δ 54.59 (CH2), δ 51.20 (CH2), δ 46.36 (CH), δ
44.68 (CH2), δ 43.81 (CH2), δ 41.08 (CH), δ 30.00 (CH3), δ 29.61 (CH2), δ 28.44 (CH2), δ 26.24 (CH3), δ 22.27 (2 CH3).
EXAMPLE 9
Synthesis of (R)-isopropyl 1 -(7-(3-chlorobut-2-enyl)-3-methyl-1 -((4- methylquinazolvn-2-yl)methyl-2,6-dioxo-2,3,6,7-tetrahydro- H-purin-8- yl)piperidin-3-yl carbamate.
2-aminoacetophenone (0.17 g, 1 .26 mmol), 1 ,4-dioxane (1 ml) were charged into a reaction flask, the temperature was brought to about 10°C and gaseous hydrochloric acid (0.29 g, 7.56 mmol), (R)-isopropyl 1 -(7-(3- chlorobut-2-enyl)-1 -(cianomethyl)-3-(methyl-2,6-dioxo-2, 4,6, 7-tetrahydro- 1H- purin-8-yl)piperidin-3-yl carbamate (0.5 g, 1.05 mmol) and the reaction mixture was kept under such conditions for about three hours. At the end of the reaction, the temperature was brought to about 5°C and sodium hydroxide solution 50% (0.60 g, 7.56 mmol) were added and the resultant solid was filtered and washed with demineralized water (1 x 0.5 ml) and 1 ,4- dioxane (1 x 0.5 ml) and dried in oven under vacuum at 50°C to give 0.47 g of (R)-isopropyl 1 -(7-(3-chlorobut-2-enyl)-3-methyl-1 -((4-methylquinazolyn-2- yl)methyl-2, 6-dioxo-2, 3, 6, 7-tetrahydro-•//-/-purin-8-yl)piperidin-3-yl carbamate.
EXAMPLE 10
Synthesis of 8-bromo-7-(3-chlorobut-2-enyl)-3-methyl-1 -((4- methylquinazolin-2-yl)methyl)- H-purin-2,6(3H,7H)-dione
2-aminoacetophenone (0.43 g, 3.20 mmol), 1 ,4-dioxane (2.5 ml) were charged into a reaction flask, the temperature was brought to about 10°C and gaseous hydrochloric acid (0.70 g, 19.2 mmol), 2-(8-bromo-7-(3-chloro- 2-enyl)-3-methyl-2,6-dioxo-2, 3, 6, 7-tetrahydro- 7H-purin-1 -yl)acetonitrile (1.0 g, 2.70 mmol) were charged and the reaction mixture was kept under such conditions for about three hours. At the end of the reaction, the temperature was brought to about 5°C and sodium hydroxide solution 50% (1 .54 g, 19.2
mmol) were added and the resultant solid was filtered and washed with demineralized water (1 x 1 ml) and 1 ,4-dioxane (1 x 1 ml) and dried in oven under vacuum at 50°C to give 1 .1 g of 8-bromo-7-(3-chlorobut-2-enyl)-3- methyl-1 -((4-methylqunazolin-2-yl)methyl)-'//-/-purin-2,6(3/-/, 7/-/ -dione.
Claims
A process for the synthesis of Linagliptin, comprising:
d) the reaction of the intermediate of formula (VI)
wherein R represents a COOR1 group or a NHCOOR1 group, wherein represents a linear or branched Ci-C6 alkyl group,
in the presence of a catalyst and a base, in an aprotic polar solvent, to give an intermediate of formula (VIII)
wherein R has the above reported meanings;
e) the optional conversion of the intermediate of formula (VIII) wherein R represents a COOR1 group into the intermediate of formula (VIII) wherein R represents a NHCOOR1 group;
f) the conversion into Linagliptina of the compound of formula (VIII) wherein R represents a NHCOORi group, by treatment with bases.
2. A process for the synthesis of Linagliptin, comprising:
a) the reaction of the compound of formula (II)
with a compound of formula (III), in the presence of a base, in an aprotic polar solvent
to give the intermediate of formula (IV)
wherein X represents a halogen atom, preferably chlorine, in the presence of a catalyst and a base, in an aprotic polar solvent, to give the intermediate of
formula (VI);
wherein R represents a group COOR1 or a group NHCOOR1, wherein R-i represents a linear or branched Ci-C6 alkyl group,
in the presence of a catalyst and a base, in an aprotic polar solvent, to give the intermediate of formula (VIII)
wherein R has the above reported meanings;
e) the optional conversion of the intermediate of formula (VIII) wherein R represents a COOR1 group into the compound of formula (VIII) wherein R represents a NHCOOR1 group;
f) the conversion into Linagliptin of the compound of formula (VIII) wherein R represents a NHCOOR1 group, by treatment with bases.
3. A process for the synthesis of Linagliptin, comprising
a) the reaction of the compound of formula (II)
with a compound of formula (III), in the presence of a base, in an aprotic polar solvent
to give the intermediate of formula (IV)
b') the reaction of the compound formula (IV) with chloroacetonitrile, in the presence of a catalyst and a base, in an aprotic polar solvent,
to give the intermediate of formula (IX)
c) the reaction of the intermediate of formula (IX) with 2-aminoacetophenone in
the presence of anhydrous hydrochloric acid, in 1 ,4-dioxane to give the intermediate of formula (VI);
the reaction of the intermediate of formula (VI) with a compound of formula (VII)
wherein R represents a group COOR1 or a group NHCOOR1, wherein represents a linear or branched Ci-C6 alkyl group,
in the presence of a catalyst and a base, in an aprotic polar solvent, to give a comp
e) the optional conversion of the intermediate of formula (VIII) wherein R represents a COOR1 group into the compound of formula (VIII) wherein R represents a NHCOOR1 group;
f) the conversion into Linagliptin of the intermediate of formula (VIII) wherein R represents a NHCOOR1 group, by treatment with bases.
Process according to anyone of the preceding claims, wherein in step d) the catalyst is preferably selected among potassium iodide tetrabutylammonium iodide, sodium iodide, copper iodide, more preferably potassium iodide and the base is preferably selected among sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, more preferably potassium carbonate; the aprotic polar solvent is preferably selected among dimethylsulphoxide, acetonitrile, dimethylformamide, dimethylacetamide or mixtures thereof, more preferably dimethylsulphoxide; step e) is carried out in the presence of diphenylphosphorilazide, and a tertiary amine preferably selected among triethylamine, tributylamine, diisopropylethylamine, N,N-dimethylaminopyridine and a suitable linear or branched C1-C4 alcohol preferably selected among methanol, ethanol, isopropanol, ter-butanol; in step f) the bases are selected among sodium terbutoxide, potassium terbutoxide, sodium hydride, metallic sodium, sodium amide, more preferably potassium terbutoxide.
Process according to claim 2, wherein in step a) an organic or inorganic base is used preferably selected among triethylamine, tributylamine, diisopropylamine, sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, more preferably triethylamine and the aprotic polar solvent is preferably selected among dimethylsulphoxide, acetonitrile, dimethylformamide, dimethylacetamide or mixtures thereof, more preferably dimethylsulphoxide; in step b) the catalyst is preferably selected among potassium iodide, tetrabutylammonium iodide, sodium iodide, copper iodide, more preferably potassium iodide and the base is preferably selected among sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, more preferably potassium carbonate and the aprotic polar solvent is preferably selected among dimethylsulphoxide, acetonitrile, dimethylformamide, dimethylacetamide or mixtures thereof, more preferably dimethylsulphoxide.
Process according to claim 3, wherein in step b') the catalyst is preferably selected among potassium iodide, tetrabutylammonium iodide, sodium iodide, copper iodide, more preferably potassium iodide and the base is preferably selected among sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, more preferably potassium carbonate and the aprotic polar solvent is preferably selected among dimethylsulphoxide, acetonitrile, dimethylformamide, dimethylacetamide or mixtures thereof, more preferably dimethylsulphoxide.
7. Compounds of formula (IV), (VI), (VIII) and (IX)
CH3
8. Use of the compounds according to claim 7 for the synthesis of Linagliptin.
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CN109705122A (en) * | 2019-02-11 | 2019-05-03 | 深圳市第二人民医院 | A kind of preparation method of Li Gelieting intermediate that treating type-2 diabetes mellitus |
WO2020031040A1 (en) | 2018-08-06 | 2020-02-13 | Richter Gedeon Nyrt. | Process and intermediates for the preparation of boc-linagliptin |
CN111574520A (en) * | 2019-02-19 | 2020-08-25 | 鲁南制药集团股份有限公司 | Riagliptin intermediate compound V |
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EP2287164A1 (en) * | 2004-11-05 | 2011-02-23 | Boehringer Ingelheim International Gmbh | Process for the manufacture of chiral 8-(3-aminopiperidin-1-yl)-xanthines |
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Cited By (5)
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WO2020031040A1 (en) | 2018-08-06 | 2020-02-13 | Richter Gedeon Nyrt. | Process and intermediates for the preparation of boc-linagliptin |
CN109705122A (en) * | 2019-02-11 | 2019-05-03 | 深圳市第二人民医院 | A kind of preparation method of Li Gelieting intermediate that treating type-2 diabetes mellitus |
CN109705122B (en) * | 2019-02-11 | 2021-11-16 | 深圳市第二人民医院 | Preparation method of linagliptin intermediate for treating type II diabetes |
CN111574520A (en) * | 2019-02-19 | 2020-08-25 | 鲁南制药集团股份有限公司 | Riagliptin intermediate compound V |
CN111574520B (en) * | 2019-02-19 | 2022-08-26 | 鲁南制药集团股份有限公司 | Riagliptin intermediate compound V |
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