WO2020001812A1 - Nouveau procédé de préparation d'inhibiteurs de sglt-2 - Google Patents
Nouveau procédé de préparation d'inhibiteurs de sglt-2 Download PDFInfo
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- WO2020001812A1 WO2020001812A1 PCT/EP2019/025192 EP2019025192W WO2020001812A1 WO 2020001812 A1 WO2020001812 A1 WO 2020001812A1 EP 2019025192 W EP2019025192 W EP 2019025192W WO 2020001812 A1 WO2020001812 A1 WO 2020001812A1
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000008569 process Effects 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims abstract description 28
- 229940123518 Sodium/glucose cotransporter 2 inhibitor Drugs 0.000 title abstract description 7
- -1 hydroxymethylene group Chemical group 0.000 claims abstract description 33
- 150000001875 compounds Chemical class 0.000 claims description 104
- 125000006239 protecting group Chemical group 0.000 claims description 46
- 238000006243 chemical reaction Methods 0.000 claims description 27
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 23
- 125000004122 cyclic group Chemical group 0.000 claims description 18
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 15
- LMBFAGIMSUYTBN-MPZNNTNKSA-N teixobactin Chemical compound C([C@H](C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CO)C(=O)N[C@H](CCC(N)=O)C(=O)N[C@H]([C@@H](C)CC)C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CO)C(=O)N[C@H]1C(N[C@@H](C)C(=O)N[C@@H](C[C@@H]2NC(=N)NC2)C(=O)N[C@H](C(=O)O[C@H]1C)[C@@H](C)CC)=O)NC)C1=CC=CC=C1 LMBFAGIMSUYTBN-MPZNNTNKSA-N 0.000 claims description 13
- 230000003647 oxidation Effects 0.000 claims description 9
- 238000007254 oxidation reaction Methods 0.000 claims description 9
- 150000004649 carbonic acid derivatives Chemical group 0.000 claims description 6
- 125000001181 organosilyl group Chemical group [SiH3]* 0.000 claims description 6
- 125000000217 alkyl group Chemical group 0.000 claims description 5
- 125000000654 isopropylidene group Chemical group C(C)(C)=* 0.000 claims description 5
- 238000007363 ring formation reaction Methods 0.000 claims description 5
- 150000005676 cyclic carbonates Chemical class 0.000 claims description 4
- 150000002148 esters Chemical group 0.000 claims description 4
- 150000008378 aryl ethers Chemical group 0.000 claims description 3
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical group [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 claims description 3
- 150000003871 sulfonates Chemical group 0.000 claims description 3
- DRSHXJFUUPIBHX-UHFFFAOYSA-N COc1ccc(cc1)N1N=CC2C=NC(Nc3cc(OC)c(OC)c(OCCCN4CCN(C)CC4)c3)=NC12 Chemical compound COc1ccc(cc1)N1N=CC2C=NC(Nc3cc(OC)c(OC)c(OCCCN4CCN(C)CC4)c3)=NC12 DRSHXJFUUPIBHX-UHFFFAOYSA-N 0.000 claims description 2
- 230000001590 oxidative effect Effects 0.000 claims description 2
- YFNKIDBQEZZDLK-UHFFFAOYSA-N triglyme Chemical compound COCCOCCOCCOC YFNKIDBQEZZDLK-UHFFFAOYSA-N 0.000 claims description 2
- 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 abstract description 5
- 239000000203 mixture Substances 0.000 description 35
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 34
- HEDRZPFGACZZDS-MICDWDOJSA-N Trichloro(2H)methane Chemical compound [2H]C(Cl)(Cl)Cl HEDRZPFGACZZDS-MICDWDOJSA-N 0.000 description 24
- 239000011734 sodium Substances 0.000 description 16
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 15
- 239000002904 solvent Substances 0.000 description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 11
- 239000000741 silica gel Substances 0.000 description 10
- 229910002027 silica gel Inorganic materials 0.000 description 10
- 238000001644 13C nuclear magnetic resonance spectroscopy Methods 0.000 description 9
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 9
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 239000003153 chemical reaction reagent Substances 0.000 description 9
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- 238000005160 1H NMR spectroscopy Methods 0.000 description 8
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- 239000002585 base Substances 0.000 description 8
- 238000010511 deprotection reaction Methods 0.000 description 8
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 7
- 239000000499 gel Substances 0.000 description 7
- 229920006395 saturated elastomer Polymers 0.000 description 7
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 6
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 6
- 150000001299 aldehydes Chemical class 0.000 description 6
- CTSLXHKWHWQRSH-UHFFFAOYSA-N oxalyl chloride Chemical compound ClC(=O)C(Cl)=O CTSLXHKWHWQRSH-UHFFFAOYSA-N 0.000 description 6
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- 238000000605 extraction Methods 0.000 description 5
- 238000003786 synthesis reaction Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- MZRVEZGGRBJDDB-UHFFFAOYSA-N N-Butyllithium Chemical compound [Li]CCCC MZRVEZGGRBJDDB-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 125000004029 hydroxymethyl group Chemical group [H]OC([H])([H])* 0.000 description 4
- 229910000027 potassium carbonate Inorganic materials 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000010561 standard procedure Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- VDZOOKBUILJEDG-UHFFFAOYSA-M tetrabutylammonium hydroxide Chemical compound [OH-].CCCC[N+](CCCC)(CCCC)CCCC VDZOOKBUILJEDG-UHFFFAOYSA-M 0.000 description 4
- OISVCGZHLKNMSJ-UHFFFAOYSA-N 2,6-dimethylpyridine Chemical compound CC1=CC=CC(C)=N1 OISVCGZHLKNMSJ-UHFFFAOYSA-N 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
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- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 3
- MCIACXAZCBVDEE-CUUWFGFTSA-N Ertugliflozin Chemical compound C1=CC(OCC)=CC=C1CC1=CC([C@@]23O[C@@](CO)(CO2)[C@@H](O)[C@H](O)[C@H]3O)=CC=C1Cl MCIACXAZCBVDEE-CUUWFGFTSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- DTQVDTLACAAQTR-UHFFFAOYSA-N Trifluoroacetic acid Chemical compound OC(=O)C(F)(F)F DTQVDTLACAAQTR-UHFFFAOYSA-N 0.000 description 3
- VKUVHQLMDOUYND-IRCOFANPSA-N [(2r,3r,4s,5r)-2,3,4,5-tetrahydroxy-6-oxohexyl] benzoate Chemical compound O=C[C@H](O)[C@@H](O)[C@H](O)[C@H](O)COC(=O)C1=CC=CC=C1 VKUVHQLMDOUYND-IRCOFANPSA-N 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 3
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 125000004177 diethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 3
- 150000004252 dithioacetals Chemical class 0.000 description 3
- 229950006535 ertugliflozin Drugs 0.000 description 3
- 239000008103 glucose Substances 0.000 description 3
- 150000004679 hydroxides Chemical class 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 229910052700 potassium Inorganic materials 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- ZUNCHZBITMUSRD-UHFFFAOYSA-N 4-bromo-1-chloro-2-[(4-ethoxyphenyl)methyl]benzene Chemical compound C1=CC(OCC)=CC=C1CC1=CC(Br)=CC=C1Cl ZUNCHZBITMUSRD-UHFFFAOYSA-N 0.000 description 2
- 0 C*C[C@]([C@@](*)N*C)[C@](*C)[C@](*C)C=O Chemical compound C*C[C@]([C@@](*)N*C)[C@](*C)[C@](*C)C=O 0.000 description 2
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- 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 description 2
- JGFZNNIVVJXRND-UHFFFAOYSA-N N,N-Diisopropylethylamine (DIPEA) Chemical compound CCN(C(C)C)C(C)C JGFZNNIVVJXRND-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- 101100244562 Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1) oprD gene Proteins 0.000 description 2
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 102000000070 Sodium-Glucose Transport Proteins Human genes 0.000 description 2
- 108010080361 Sodium-Glucose Transport Proteins Proteins 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 125000002777 acetyl group Chemical group [H]C([H])([H])C(*)=O 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 229910000102 alkali metal hydride Inorganic materials 0.000 description 2
- 150000008046 alkali metal hydrides Chemical class 0.000 description 2
- 150000004703 alkoxides Chemical class 0.000 description 2
- 125000005210 alkyl ammonium group Chemical group 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- RQPZNWPYLFFXCP-UHFFFAOYSA-L barium dihydroxide Chemical compound [OH-].[OH-].[Ba+2] RQPZNWPYLFFXCP-UHFFFAOYSA-L 0.000 description 2
- 125000003236 benzoyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C(*)=O 0.000 description 2
- 125000001743 benzylic group Chemical group 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 206010012601 diabetes mellitus Diseases 0.000 description 2
- 229960001760 dimethyl sulfoxide Drugs 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 2
- 239000000347 magnesium hydroxide Substances 0.000 description 2
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 2
- PPNAOCWZXJOHFK-UHFFFAOYSA-N manganese(2+);oxygen(2-) Chemical compound [O-2].[Mn+2] PPNAOCWZXJOHFK-UHFFFAOYSA-N 0.000 description 2
- VASIZKWUTCETSD-UHFFFAOYSA-N manganese(II) oxide Inorganic materials [Mn]=O VASIZKWUTCETSD-UHFFFAOYSA-N 0.000 description 2
- OKKJLVBELUTLKV-VMNATFBRSA-N methanol-d1 Chemical compound [2H]OC OKKJLVBELUTLKV-VMNATFBRSA-N 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 229910000028 potassium bicarbonate Inorganic materials 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
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- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- MFRIHAYPQRLWNB-UHFFFAOYSA-N sodium tert-butoxide Chemical compound [Na+].CC(C)(C)[O-] MFRIHAYPQRLWNB-UHFFFAOYSA-N 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- YQTCQNIPQMJNTI-UHFFFAOYSA-N 2,2-dimethylpropan-1-one Chemical group CC(C)(C)[C]=O YQTCQNIPQMJNTI-UHFFFAOYSA-N 0.000 description 1
- XWKFPIODWVPXLX-UHFFFAOYSA-N 2-methyl-5-methylpyridine Natural products CC1=CC=C(C)N=C1 XWKFPIODWVPXLX-UHFFFAOYSA-N 0.000 description 1
- JWUJQDFVADABEY-UHFFFAOYSA-N 2-methyltetrahydrofuran Chemical compound CC1CCCO1 JWUJQDFVADABEY-UHFFFAOYSA-N 0.000 description 1
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 1
- JHUUPUMBZGWODW-UHFFFAOYSA-N 3,6-dihydro-1,2-dioxine Chemical compound C1OOCC=C1 JHUUPUMBZGWODW-UHFFFAOYSA-N 0.000 description 1
- JVVRCYWZTJLJSG-UHFFFAOYSA-N 4-dimethylaminophenol Chemical compound CN(C)C1=CC=C(O)C=C1 JVVRCYWZTJLJSG-UHFFFAOYSA-N 0.000 description 1
- 229960000549 4-dimethylaminophenol Drugs 0.000 description 1
- VHYFNPMBLIVWCW-UHFFFAOYSA-N 4-dimethylaminopyridine Substances CN(C)C1=CC=NC=C1 VHYFNPMBLIVWCW-UHFFFAOYSA-N 0.000 description 1
- BTOYCPDACQXQRS-UHFFFAOYSA-N 6,6-bis(ethylsulfanyl)hexane-1,2,3,4,5-pentol Chemical compound CCSC(SCC)C(O)C(O)C(O)C(O)CO BTOYCPDACQXQRS-UHFFFAOYSA-N 0.000 description 1
- XKAKWUCBLWDVDC-BPRWDIACSA-N CC(C)(O[C@@H]1CO)O[C@H]1[C@@H]1OC(C)(C)O[C@H]1C[AlH2] Chemical compound CC(C)(O[C@@H]1CO)O[C@H]1[C@@H]1OC(C)(C)O[C@H]1C[AlH2] XKAKWUCBLWDVDC-BPRWDIACSA-N 0.000 description 1
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 1
- 238000006732 Fleming-Tamao oxidation reaction Methods 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 102100037202 Sodium/myo-inositol cotransporter 2 Human genes 0.000 description 1
- 101710090560 Sodium/myo-inositol cotransporter 2 Proteins 0.000 description 1
- WLLIXJBWWFGEHT-UHFFFAOYSA-N [tert-butyl(dimethyl)silyl] trifluoromethanesulfonate Chemical compound CC(C)(C)[Si](C)(C)OS(=O)(=O)C(F)(F)F WLLIXJBWWFGEHT-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000005882 aldol condensation reaction Methods 0.000 description 1
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
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- 239000003472 antidiabetic agent Substances 0.000 description 1
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- 229910001863 barium hydroxide Inorganic materials 0.000 description 1
- AQIHMSVIAGNIDM-UHFFFAOYSA-N benzoyl bromide Chemical compound BrC(=O)C1=CC=CC=C1 AQIHMSVIAGNIDM-UHFFFAOYSA-N 0.000 description 1
- 230000008236 biological pathway Effects 0.000 description 1
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- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
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- 238000002512 chemotherapy Methods 0.000 description 1
- KOTFCAKXPLOYLN-UHFFFAOYSA-N chloromethyl-dimethyl-propan-2-yloxysilane Chemical compound CC(C)O[Si](C)(C)CCl KOTFCAKXPLOYLN-UHFFFAOYSA-N 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- NLFBCYMMUAKCPC-KQQUZDAGSA-N ethyl (e)-3-[3-amino-2-cyano-1-[(e)-3-ethoxy-3-oxoprop-1-enyl]sulfanyl-3-oxoprop-1-enyl]sulfanylprop-2-enoate Chemical compound CCOC(=O)\C=C\SC(=C(C#N)C(N)=O)S\C=C\C(=O)OCC NLFBCYMMUAKCPC-KQQUZDAGSA-N 0.000 description 1
- 230000029142 excretion Effects 0.000 description 1
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- 150000004795 grignard reagents Chemical class 0.000 description 1
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- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
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- PELJISAVHGXLAL-UHFFFAOYSA-N iodomethyl 2,2-dimethylpropanoate Chemical compound CC(C)(C)C(=O)OCI PELJISAVHGXLAL-UHFFFAOYSA-N 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000011005 laboratory method Methods 0.000 description 1
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- YNESATAKKCNGOF-UHFFFAOYSA-N lithium bis(trimethylsilyl)amide Chemical compound [Li+].C[Si](C)(C)[N-][Si](C)(C)C YNESATAKKCNGOF-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 150000002739 metals Chemical class 0.000 description 1
- 125000004184 methoxymethyl group Chemical group [H]C([H])([H])OC([H])([H])* 0.000 description 1
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- 210000000885 nephron Anatomy 0.000 description 1
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- 125000006503 p-nitrobenzyl group Chemical group [H]C1=C([H])C(=C([H])C([H])=C1[N+]([O-])=O)C([H])([H])* 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 239000002798 polar solvent Substances 0.000 description 1
- 229920001467 poly(styrenesulfonates) Polymers 0.000 description 1
- 235000015497 potassium bicarbonate Nutrition 0.000 description 1
- 239000011736 potassium bicarbonate Substances 0.000 description 1
- IUBQJLUDMLPAGT-UHFFFAOYSA-N potassium bis(trimethylsilyl)amide Chemical compound C[Si](C)(C)N([K])[Si](C)(C)C IUBQJLUDMLPAGT-UHFFFAOYSA-N 0.000 description 1
- 235000011181 potassium carbonates Nutrition 0.000 description 1
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 description 1
- LPNYRYFBWFDTMA-UHFFFAOYSA-N potassium tert-butoxide Chemical compound [K+].CC(C)(C)[O-] LPNYRYFBWFDTMA-UHFFFAOYSA-N 0.000 description 1
- ZRLVQFQTCMUIRM-UHFFFAOYSA-N potassium;2-methylbutan-2-olate Chemical compound [K+].CCC(C)(C)[O-] ZRLVQFQTCMUIRM-UHFFFAOYSA-N 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 239000003586 protic polar solvent Substances 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- ZDYVRSLAEXCVBX-UHFFFAOYSA-N pyridinium p-toluenesulfonate Chemical compound C1=CC=[NH+]C=C1.CC1=CC=C(S([O-])(=O)=O)C=C1 ZDYVRSLAEXCVBX-UHFFFAOYSA-N 0.000 description 1
- 230000009103 reabsorption Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 125000001981 tert-butyldimethylsilyl group Chemical group [H]C([H])([H])[Si]([H])(C([H])([H])[H])[*]C(C([H])([H])[H])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 125000000037 tert-butyldiphenylsilyl group Chemical group [H]C1=C([H])C([H])=C([H])C([H])=C1[Si]([H])([*]C(C([H])([H])[H])(C([H])([H])[H])C([H])([H])[H])C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 1
- FPGGTKZVZWFYPV-UHFFFAOYSA-M tetrabutylammonium fluoride Chemical compound [F-].CCCC[N+](CCCC)(CCCC)CCCC FPGGTKZVZWFYPV-UHFFFAOYSA-M 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 125000001412 tetrahydropyranyl group Chemical group 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 125000005270 trialkylamine group Chemical group 0.000 description 1
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 1
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 210000002700 urine Anatomy 0.000 description 1
- 239000003039 volatile agent Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07H—SUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
- C07H1/00—Processes for the preparation of sugar derivatives
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
- C07F7/02—Silicon compounds
- C07F7/08—Compounds having one or more C—Si linkages
- C07F7/18—Compounds having one or more C—Si linkages as well as one or more C—O—Si linkages
- C07F7/1804—Compounds having Si-O-C linkages
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07H—SUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
- C07H23/00—Compounds containing boron, silicon, or a metal, e.g. chelates, vitamin B12
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07H—SUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
- C07H7/00—Compounds containing non-saccharide radicals linked to saccharide radicals by a carbon-to-carbon bond
- C07H7/04—Carbocyclic radicals
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07H—SUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
- C07H9/00—Compounds containing a hetero ring sharing at least two hetero atoms with a saccharide radical
- C07H9/02—Compounds containing a hetero ring sharing at least two hetero atoms with a saccharide radical the hetero ring containing only oxygen as ring hetero atoms
- C07H9/04—Cyclic acetals
Definitions
- the present invention relates to a novel process for the preparation of SGLT-2 inhibitors. Such compounds have attracted a continuously growing interest, owed to their use in the treatment of diabetes.
- SGLT-2 inhibitors are a new and promising class of drugs utilized in diabetes treatment. Their distinguishing feature from previously known antidiabetic drugs is the biological pathway they are involved into. In particular, the sodium glucose transport proteins regulate the reabsorption of glucose from the nephron. Inhibition of SGLT proteins results in the excretion of glucose in the urine, leading in a reduction of blood glucose levels.
- Patent application W02010023594A1 discloses the synthesis of such a SGLT-2 inhibitor, Ertugliflozin (Formula la), according to the scheme shown below.
- the starting material is prepared from D-glucose in 4 steps with 57% yield.
- This process features the introduction of the required hydroxymethyl group at the first steps of the synthetic route with the use of formaldehyde.
- the two-step transformation suffers from low yield (53%).
- the given process also employs the use of reagents unsuitable for industrial production, such as n-butyl lithium and trimethylaluminium.
- the process further requires the deprotection of three benzyl groups via catalytic hydrogenation with precious metals, raising the overall cost of the process.
- the method is hindered by the epimerization which occurs under the influence of n-butyl lithium, making tedious purifications unavoidable.
- Patent application WO2014159151A1 discloses another process for the preparation of compound of formula I.
- the starting material is tetra-O-benzyl-D-glucose.
- This process not only employs expensive reagents for the hydroxymethylene group introduction, but it further uses benzyl protecting groups, which requires the use of palladium catalyst. Overall this route suffers from the use of costly reagents.
- the present invention discloses a novel process for the preparation of compound of Formula I, comprising the introduction of a hydroxymethyl group into compound of formula II, thereby producing compound of formula III.
- Ar represents the moiety shown below, protecting groups PG1 and PG2 together form a first cyclic protecting group and protecting groups PG3 and PG4 form a second cyclic protecting group.
- hydroxyl protecting groups refers to protecting groups suitable for the protection of the hydroxyl moiety, which is then defined as“protected hydroxyl group”.
- the definition includes both simple and cyclic protecting groups. Such groups are known in the art and are exemplified such as in Greene’s Protective Groups on Organic Synthesis 4 th Edition, John Wiley & Son, Peter G. M. Wuts, Theodora W. Greene, Print ISBN: 9780471697541.
- Preferred protecting groups are trltyl, benzyl, naphthyl, methoxybenzyl, p-nitrobenzyl, benzoyl, a substituted benzoyl, acetyl, a substituted acetyl, pivaloyl,trimethylsilyl, triethylsilyl, isopropyldimethylsilyl, tert- butyldimethylsilyl, tert-butyldiphenylsilyl, thexyldimethylsilyl, allyl, methoxymethyl, (2-methoxyethoxy)methyl, tetrahydropyranyl.
- Preferred cyclic hydroxyl protecting groups are ethylidene, isopropylidene, pentylidene, hexylidene, benzyline, p- methoxybenzylidene, naphthylidene, 4-phenylbenzylidene, methoxymethylene, ethoxymethylene, cyclic carbonate, l,3-(l,l,3,3-tetraisopropyl)disiloxanediyl, di-tert- butylsilylenediyl.
- Stereoisomers are ethylidene, isopropylidene, pentylidene, hexylidene, benzyline, p- methoxybenzylidene, naphthylidene, 4-phenylbenzylidene, methoxymethylene, ethoxymethylene, cyclic carbonate, l,3-(l,l,3,3-tetrais
- stereoisomers Some compounds prepared according to the present invention exist as stereoisomers.
- the scope of the present invention involves the preparation of such compounds either as mixtures of stereoisomers, or as single stereoisomers.
- Optimal purification according to standard techniques, known to the skilled person, can afford each stereoisomer in a pure form, whenever this is preferred.
- Base when used herein includes hydroxides or alkoxides, hydrides, or compounds such as amine and its derivatives, that accept protons in water or solvent.
- exemplary bases include, but are not limited to, alkali metal hydroxides and alkoxides (i.e., MOR, wherein M is an alkali metal such as potassium, lithium, or sodium, and R is hydrogen or alkyl, as defined above, more preferably where R is straight or branched chain Cl -5 alkyl, thus including, without limitation, potassium hydroxide, potassium tert-butoxide, potassium tert-pentoxide, sodium hydroxide, sodium tert- butoxide, lithium hydroxide, etc.); other hydroxides such as magnesium hydroxide (Mg(OH) 2 ) or calcium hydroxide (Ca(OH) 2 ), barium hydroxide (Ba(OH) 2 ); alkali metal hydrides (i.e., MH, wherein M is as defined above, thus including, without
- Aqueous bases include metal hydroxides, for example, hydroxides of Group l/Group 2 metals such as Li, Na, K, Mg, Ca, etc. (e.g., aqueous LiOH, NaOH, KOH, etc.), alkyl ammonium hydroxides, and aqueous carbonates.
- metal hydroxides for example, hydroxides of Group l/Group 2 metals such as Li, Na, K, Mg, Ca, etc. (e.g., aqueous LiOH, NaOH, KOH, etc.), alkyl ammonium hydroxides, and aqueous carbonates.
- Non-aqueous bases include but not limited to, amines and their derivatives, for example, trialkyl amine (e.g., Et 3 N, diisopropylethyl amine, etc.), and aromatic amine (e.g., Ph-NH 2 , PhN(Me)H, etc.); alkali metal alkoxides; alkali metal hydrides; alkylated disilazides; and non-aqueous carbonates.
- A“strong base” is a base that is completely dissociated in an aqueous solution.
- the present invention discloses a novel process for the preparation of compound of formula I, comprising: a) conversion of compound of formula II to compound of formula III, wherein Ar represents the moiety shown below, protecting groups PG1 and PG2 together form a first cyclic protecting group and protecting groups PG3 and PG4 together form a second cyclic protecting group, said cyclic protecting groups selected from cyclic acetals, cyclic ketals, cyclic ortho esters, cyclic carbonates and silyl derivatives and PG5 is a hydroxyl protecting group selected from alkyl and aryl ethers, silyl ethers, esters, carbonates, sulfonates; and
- formaldehyde source may conveniently be achieved in the presence of a formaldehyde source.
- the source of formaldehyde may be any source available to the skilled person either commercially or by using his common general knowledge and standard laboratory techniques. For example, p-formaldehyde or a solution of aldehyde, such as aqueous solution, may be used.
- the amount of formaldehyde should be excessive. Excess of formaldehyde promotes the reduction of the aldehyde carbon which leads to compound of formula III, in a Cannizzaro-type fashion.
- the temperature of the reaction may be such that drives the reaction to completion.
- the reaction is performed at a temperature range from 25 °C to the boiling point of the solvent used in the reaction. More preferably, the reaction is performed at a temperature between 40 and 100 °C.
- the reaction is performed in polar protic solvents, such as methanol and by using strong bases.
- Compound of formula II may be isolated pursuant to standard techniques or it may be prepared shortly before and used without isolation in the reaction towards compound III. In a preferred embodiment compound II is not isolated.
- Each pair of protecting groups PG1/PG2 and PG3/PG4 represents a cyclic protecting group. Accordingly, there are two cyclic protecting groups which are protecting 4 hydroxyl groups.
- the cyclic protecting groups are selected from: ethylidene, isopropylidene, pentylidene, hexylidene, benzyline, p- methoxybenzylidene, naphthylidene, 4-phenylbenzylidene, methoxymethylene, ethoxymethylene, cyclic carbonate, l,3-(l,l,3,3-tetraisopropyl)disiloxanediyl, di-tert- butylsilylenediyl.
- the cyclic protecting groups are selected from: ethylidene, isopropylidene, pentylidene, hexylidene, benzyline, p- methoxybenzylidene, 4-phenylbenzylidene. Even more preferably, the cyclic protecting groups are isopropylidene groups.
- the present invention discloses a process for the preparation of compound of formula I as described above, wherein step b comprises: i) selectively deprotecting PG5 from compound of formula III to form compound of formula IV ;
- protecting group PG5 may be performed in accordance with the nature of the group.
- Protecting group PG5 should be selected such that it can be removed in the presence of cyclic groups PG1/PG2 and PG3/PG4.
- Preferred hydroxyl protecting groups are alkyl and aryl ethers, silyl ethers, esters, carbonates, sulfonates.
- protecting group PG5 is a silyl protecting group. Appropriate deprotection techniques are well known to the skilled person and can be found in textbooks as mentioned above.
- step b-ii The conversion of compound of formula IV to compound of formula V according to step b-ii is performed by selective oxidation of the secondary (benzylic) hydroxyl group in the presence of two unprotected primary hydroxyls groups.
- a number of available techniques are disclosed in textbooks, such as March’s Advanced Organic Chemistry, M. B. Smith & J. March, John Wiley & Sons, 6 th edition, ISBN 13:978-0- 471-72091-1, Chapter 19-3.
- the selective oxidation is performed with manganese (II) oxide.
- the solvents of the reaction can be aprotic polar solvents, such as dichloromethane, tetrahydrofuran, 2-methyl-tetrahydrofuran, ethyl acetate, acetone, N,N- dimethylformamide, acetonitrile, dimethyl sulfoxide, or non-polar solvents, such as pentane, hexane, cyclohexane, benzene, toluene, chloroform, diethyl ether, chloroform, l,4-dioxane .
- aprotic polar solvents such as dichloromethane, tetrahydrofuran, 2-methyl-tetrahydrofuran, ethyl acetate, acetone, N,N- dimethylformamide, acetonitrile, dimethyl sulfoxide, or non-polar solvents, such as pent
- excess of manganese (II) oxide is used, most preferably 10 equivalents.
- the deprotection of protecting groups PG1-PG4 according to step b-iii may be performed in accordance with the nature of the group.
- the conditions employed for deprotection may also bring about the simultaneous cyclization of the deprotected intermediate towards compound of formula I. For example, when acidic conditions are used, this may lead to the deprotection of acid-labile protecting groups with simultaneous cyclization.
- Other conditions, suitable for the deprotection of protecting groups PG1-PG4 may also be employed, followed by the use of an appropriate reagent to promote the cyclization, as exemplified in prior art.
- Suitable reagents are trifluoroacetic acid, acetic acid, pyridinium p-toluenesulfonate (PPTS), hydrogen halides and their solutions, preferable, hydrogen chloride and its solutions, sulfuric acid and its solutions, acidic resins such as Amberlyst and Dowex resins.
- PPTS pyridinium p-toluenesulfonate
- hydrogen halides and their solutions preferable, hydrogen chloride and its solutions, sulfuric acid and its solutions, acidic resins such as Amberlyst and Dowex resins.
- Suitable conditions for this step can be also found in widely used textbooks, such as Greene’s Protective Groups on Organic Synthesis 4 th Edition, John Wiley & Son, Peter G. M. Wuts, Theodora W. Greene, Print ISBN: 9780471697541.
- the present invention discloses a process for the preparation of compound of formula I as described in the previous embodiments, further comprising preparing compound of formula II by oxidation of compound of formula VI.
- Several methods for the oxidation of primary hydroxyl groups to aldehydes are available in prior art and exemplified in common textbooks (March’s Advanced Organic Chemistry, M. B. Smith & J. March, John Wiley & Sons, 6th edition, ISBN 13:978-0-471-72091-1, Chapter 19-3).
- Compound of formula II may be isolated or directly used in the next step of the process, as described in previous embodiments.
- the oxidation is performed under Swem conditions.
- Swem conditions involve the use of dimethysulfoxide and oxalyl chloride and are well described in textbooks as mentioned above.
- Compound of formula VIII is prepared from compound of formula VII by reaction with ArMgBr under standard Grigrard conditions. This reaction creates a new stereocenter and the product of the reaction may be a mixture of two diastereomers with respect to this stereocenter. Both of them, however, are equally useful within the process described herein, as this hydroxyl group is intended to be oxidized in the last steps of the process (see scheme 5). Therefore no separation of the diastereomers is required.
- protecting group PG5 The benzylic hydroxyl group of compound of formula VIII is protected with protecting group PG5 to provide compound of formula IX under standard techniques available in textbook mentioned above.
- protecting group PG5 has been discussed above. It should be added that protecting group PG5 should be stable enough under conditions that remove protecting group PG6.
- protecting group PG5 is a silyl protecting group. Thereafter, deprotection from PG6, performed according to the nature of the protecting group, converts compound of formula IX to compound of formula VI.
- Protecting group PG6 should be selected such that it can be removed in the presence of protecting groups PG1/PG2, PG3/PG4 and PG5.
- PG5 is an ester protecting group.
- a process for the preparation of compound of formula V comprising the conversion of compound of formula II to compound of formula III as described in the previous embodiments.
- novel compounds of formulae II, III, IV and V are provided.
- protecting groups PG1/PG2 and PG3/PG4 are isopropylidene protecting groups and compounds of formulae III, IV and V are compounds of formulae Ilia’, IVa, Va.
- protecting groups PG1/PG2 and PG3/PG4 are isopropylidene protecting groups and protecting group PG5 is a silyl protecting group. More preferably, PG5 is a TBS group and compounds of formulae II, III are respectively Ila and Ilia.
- Oxalyl chloride (0.095 ml; 1.14 mmol) was dissolved in dry DCM (2 ml) in a dry 25 ml round-bottomed flask, and cooled at -65 °C.
- dry DMSO (0.1 ml) was dissolved in dry DCM( 0.6 ml) and the DMSO solution was added dropwise to the solution of oxalyl chloride at -65 °C, followed by stirring at this temperature for 10 min.
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Abstract
La présente invention concerne un nouveau procédé pour la préparation d'inhibiteurs de SGLT-2 par addition d'un groupe hydroxyméthylène dans un intermédiaire à chaîne ouverte, facile à obtenir à partir de D-glucose.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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EP19742290.0A EP3810623A1 (fr) | 2018-06-25 | 2019-06-21 | Nouveau procédé de préparation d'inhibiteurs de sglt-2 |
Applications Claiming Priority (2)
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EPPCT/EP2018/025170 | 2018-06-25 | ||
EP2018025170 | 2018-06-25 |
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WO2020001812A1 true WO2020001812A1 (fr) | 2020-01-02 |
Family
ID=67390044
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PCT/EP2019/025192 WO2020001812A1 (fr) | 2018-06-25 | 2019-06-21 | Nouveau procédé de préparation d'inhibiteurs de sglt-2 |
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EP (1) | EP3810623A1 (fr) |
WO (1) | WO2020001812A1 (fr) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020137903A1 (en) | 1999-10-12 | 2002-09-26 | Bruce Ellsworth | C-aryl glucoside SGLT2 inhibitors and method |
WO2010023594A1 (fr) | 2008-08-28 | 2010-03-04 | Pfizer Inc. | Dérivés de dioxa-bicyclo[3.2.1.]octane-2,3,4-triol |
WO2014159151A1 (fr) | 2013-03-14 | 2014-10-02 | Msd International Gmbh | Procédés de préparation d'inhibiteurs de sglt2 |
-
2019
- 2019-06-21 WO PCT/EP2019/025192 patent/WO2020001812A1/fr unknown
- 2019-06-21 EP EP19742290.0A patent/EP3810623A1/fr not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020137903A1 (en) | 1999-10-12 | 2002-09-26 | Bruce Ellsworth | C-aryl glucoside SGLT2 inhibitors and method |
WO2010023594A1 (fr) | 2008-08-28 | 2010-03-04 | Pfizer Inc. | Dérivés de dioxa-bicyclo[3.2.1.]octane-2,3,4-triol |
WO2014159151A1 (fr) | 2013-03-14 | 2014-10-02 | Msd International Gmbh | Procédés de préparation d'inhibiteurs de sglt2 |
Non-Patent Citations (5)
Title |
---|
BERNHARDSON D. ET AL.: "Development of an Early-Phase Bulk Enabling Route to Sodium-Dependent Glucose Cotransporter 2 Inhibitor Ertugliflozin", OPRD, vol. 18, no. 57, 2014, pages 57 - 65, XP055212312, DOI: doi:10.1021/op400289z |
BOWLES P. ET AL.: "Commercial Route Research and Development for SGLT2 Inhibitor Candidate Ertugliflozin", OPRD, vol. 18, no. 57, 2014, pages 66 - 81, XP055283061, DOI: doi:10.1021/op4002802 |
DAVID BERNHARDSON ET AL: "Development of an Early-Phase Bulk Enabling Route to Sodium-Dependent Glucose Cotransporter 2 Inhibitor Ertugliflozin", ORGANIC PROCESS RESEARCH & DEVELOPMENT, vol. 18, no. 1, 17 January 2014 (2014-01-17), pages 57 - 65, XP055212312, ISSN: 1083-6160, DOI: 10.1021/op400289z * |
PAUL BOWLES ET AL: "Commercial Route Research and Development for SGLT2 Inhibitor Candidate Ertugliflozin", ORGANIC PROCESS RESEARCH AND DEVELOPMENT, vol. 18, no. 1, 17 January 2014 (2014-01-17), US, pages 66 - 81, XP055283061, ISSN: 1083-6160, DOI: 10.1021/op4002802 * |
PETER G. M. WUTSTHEODORA W. GREENE: "Greene's Protective Groups on Organic Synthesis", JOHN WILEY & SONS |
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