WO2009090903A1 - 白金錯体化合物およびその利用 - Google Patents
白金錯体化合物およびその利用 Download PDFInfo
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- WO2009090903A1 WO2009090903A1 PCT/JP2009/050084 JP2009050084W WO2009090903A1 WO 2009090903 A1 WO2009090903 A1 WO 2009090903A1 JP 2009050084 W JP2009050084 W JP 2009050084W WO 2009090903 A1 WO2009090903 A1 WO 2009090903A1
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- Prior art keywords
- platinum complex
- complex compound
- compound
- platinum
- tetrazolato
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- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 title claims abstract description 209
- 150000001875 compounds Chemical class 0.000 title claims abstract description 109
- 229910052697 platinum Inorganic materials 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 claims abstract description 11
- 239000002246 antineoplastic agent Chemical class 0.000 claims abstract description 9
- 239000004480 active ingredient Substances 0.000 claims abstract description 8
- 150000001449 anionic compounds Chemical class 0.000 claims abstract description 4
- 150000002891 organic anions Chemical class 0.000 claims abstract description 4
- KJUGUADJHNHALS-UHFFFAOYSA-N 1H-tetrazole Chemical compound C=1N=NNN=1 KJUGUADJHNHALS-UHFFFAOYSA-N 0.000 claims description 44
- 125000001424 substituent group Chemical group 0.000 claims description 32
- 239000000203 mixture Substances 0.000 claims description 24
- -1 platinum ions Chemical class 0.000 claims description 20
- 238000004519 manufacturing process Methods 0.000 claims description 15
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 claims description 11
- VLTRZXGMWDSKGL-UHFFFAOYSA-M perchlorate Inorganic materials [O-]Cl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-M 0.000 claims description 9
- 125000004432 carbon atom Chemical group C* 0.000 claims description 5
- 125000001183 hydrocarbyl group Chemical group 0.000 claims description 5
- MHCFAGZWMAWTNR-UHFFFAOYSA-M lithium perchlorate Chemical compound [Li+].[O-]Cl(=O)(=O)=O MHCFAGZWMAWTNR-UHFFFAOYSA-M 0.000 claims description 5
- 229910001486 lithium perchlorate Inorganic materials 0.000 claims description 5
- 125000000217 alkyl group Chemical group 0.000 claims description 4
- 150000003536 tetrazoles Chemical group 0.000 claims description 4
- 229910001412 inorganic anion Chemical group 0.000 claims description 3
- 238000004366 reverse phase liquid chromatography Methods 0.000 claims description 2
- DQLATGHUWYMOKM-UHFFFAOYSA-L cisplatin Chemical compound N[Pt](N)(Cl)Cl DQLATGHUWYMOKM-UHFFFAOYSA-L 0.000 abstract description 19
- 229960004316 cisplatin Drugs 0.000 abstract description 17
- 238000002360 preparation method Methods 0.000 abstract description 10
- 150000001450 anions Chemical class 0.000 abstract description 7
- HRGDZIGMBDGFTC-UHFFFAOYSA-N platinum(2+) Chemical compound [Pt+2] HRGDZIGMBDGFTC-UHFFFAOYSA-N 0.000 abstract description 6
- 150000002500 ions Chemical class 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 31
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- 238000005481 NMR spectroscopy Methods 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 13
- 238000001819 mass spectrum Methods 0.000 description 11
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- 239000007858 starting material Substances 0.000 description 9
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- 238000001644 13C nuclear magnetic resonance spectroscopy Methods 0.000 description 6
- 238000005160 1H NMR spectroscopy Methods 0.000 description 6
- 229910020366 ClO 4 Inorganic materials 0.000 description 6
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- 239000007864 aqueous solution Substances 0.000 description 6
- 239000012153 distilled water Substances 0.000 description 6
- 238000004949 mass spectrometry Methods 0.000 description 6
- 229910052708 sodium Inorganic materials 0.000 description 6
- 239000011734 sodium Substances 0.000 description 6
- 238000001914 filtration Methods 0.000 description 5
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- 239000002904 solvent Substances 0.000 description 5
- 238000012916 structural analysis Methods 0.000 description 5
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- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 4
- 239000012043 crude product Substances 0.000 description 4
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- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 3
- 206010058467 Lung neoplasm malignant Diseases 0.000 description 3
- 206010028980 Neoplasm Diseases 0.000 description 3
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- 230000037353 metabolic pathway Effects 0.000 description 3
- 238000000655 nuclear magnetic resonance spectrum Methods 0.000 description 3
- 238000001308 synthesis method Methods 0.000 description 3
- NBWRJAOOMGASJP-UHFFFAOYSA-N 2-(3,5-diphenyl-1h-tetrazol-1-ium-2-yl)-4,5-dimethyl-1,3-thiazole;bromide Chemical compound [Br-].S1C(C)=C(C)N=C1N1N(C=2C=CC=CC=2)N=C(C=2C=CC=CC=2)[NH2+]1 NBWRJAOOMGASJP-UHFFFAOYSA-N 0.000 description 2
- SVTBMSDMJJWYQN-UHFFFAOYSA-N 2-methylpentane-2,4-diol Chemical compound CC(O)CC(C)(C)O SVTBMSDMJJWYQN-UHFFFAOYSA-N 0.000 description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical group CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 102000053602 DNA Human genes 0.000 description 2
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical group CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
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- 125000004122 cyclic group Chemical group 0.000 description 2
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- 238000013461 design Methods 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 229910003002 lithium salt Inorganic materials 0.000 description 2
- 159000000002 lithium salts Chemical group 0.000 description 2
- 230000010534 mechanism of action Effects 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- VMGAPWLDMVPYIA-HIDZBRGKSA-N n'-amino-n-iminomethanimidamide Chemical compound N\N=C\N=N VMGAPWLDMVPYIA-HIDZBRGKSA-N 0.000 description 2
- 230000001575 pathological effect Effects 0.000 description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
- 150000003058 platinum compounds Chemical class 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- BOLDJAUMGUJJKM-LSDHHAIUSA-N renifolin D Natural products CC(=C)[C@@H]1Cc2c(O)c(O)ccc2[C@H]1CC(=O)c3ccc(O)cc3O BOLDJAUMGUJJKM-LSDHHAIUSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- YQPWDNVPGHGINR-UHFFFAOYSA-N 5-cyclohexa-2,4-dien-1-yl-2h-tetrazole Chemical compound C1C=CC=CC1C1=NNN=N1 YQPWDNVPGHGINR-UHFFFAOYSA-N 0.000 description 1
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 description 1
- AZHYOJBTVHTOAR-UHFFFAOYSA-N CC1NN(C)N(C)N1 Chemical compound CC1NN(C)N(C)N1 AZHYOJBTVHTOAR-UHFFFAOYSA-N 0.000 description 1
- XNVGFVNOTCGEIQ-UHFFFAOYSA-N CCOC(C1NN(C)N(C)N1)=O Chemical compound CCOC(C1NN(C)N(C)N1)=O XNVGFVNOTCGEIQ-UHFFFAOYSA-N 0.000 description 1
- PDIIOVAYGVAEBA-UHFFFAOYSA-N CN1N(C)NC(c2ccccc2)N1 Chemical compound CN1N(C)NC(c2ccccc2)N1 PDIIOVAYGVAEBA-UHFFFAOYSA-N 0.000 description 1
- KRKNYBCHXYNGOX-UHFFFAOYSA-K Citrate Chemical compound [O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O KRKNYBCHXYNGOX-UHFFFAOYSA-K 0.000 description 1
- FEWJPZIEWOKRBE-JCYAYHJZSA-L L-tartrate(2-) Chemical compound [O-]C(=O)[C@H](O)[C@@H](O)C([O-])=O FEWJPZIEWOKRBE-JCYAYHJZSA-L 0.000 description 1
- JVTAAEKCZFNVCJ-UHFFFAOYSA-M Lactate Chemical compound CC(O)C([O-])=O JVTAAEKCZFNVCJ-UHFFFAOYSA-M 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 229940045985 antineoplastic platinum compound Drugs 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- BHKICZDKIIDMNR-UHFFFAOYSA-L azane;cyclobutane-1,1-dicarboxylate;platinum(4+) Chemical compound N.N.[Pt+4].[O-]C(=O)C1(C([O-])=O)CCC1 BHKICZDKIIDMNR-UHFFFAOYSA-L 0.000 description 1
- GRHLMSBCOPRFNA-UHFFFAOYSA-M azanide 2-oxidoacetate platinum(4+) Chemical compound N[Pt]1(N)OCC(=O)O1 GRHLMSBCOPRFNA-UHFFFAOYSA-M 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229960004562 carboplatin Drugs 0.000 description 1
- 125000005392 carboxamide group Chemical group NC(=O)* 0.000 description 1
- 230000010261 cell growth Effects 0.000 description 1
- 238000002512 chemotherapy Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- NAOHMNNTUFFTBF-UHFFFAOYSA-N ethyl 2-(2h-tetrazol-5-yl)acetate Chemical compound CCOC(=O)CC=1N=NNN=1 NAOHMNNTUFFTBF-UHFFFAOYSA-N 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
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- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229940030980 inova Drugs 0.000 description 1
- 230000003834 intracellular effect Effects 0.000 description 1
- 238000010253 intravenous injection Methods 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 125000002816 methylsulfanyl group Chemical group [H]C([H])([H])S[*] 0.000 description 1
- SYSQUGFVNFXIIT-UHFFFAOYSA-N n-[4-(1,3-benzoxazol-2-yl)phenyl]-4-nitrobenzenesulfonamide Chemical class C1=CC([N+](=O)[O-])=CC=C1S(=O)(=O)NC1=CC=C(C=2OC3=CC=CC=C3N=2)C=C1 SYSQUGFVNFXIIT-UHFFFAOYSA-N 0.000 description 1
- 229950007221 nedaplatin Drugs 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229960001756 oxaliplatin Drugs 0.000 description 1
- DWAFYCQODLXJNR-BNTLRKBRSA-L oxaliplatin Chemical compound O1C(=O)C(=O)O[Pt]11N[C@@H]2CCCC[C@H]2N1 DWAFYCQODLXJNR-BNTLRKBRSA-L 0.000 description 1
- 230000007170 pathology Effects 0.000 description 1
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- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
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- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
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- 159000000000 sodium salts Chemical class 0.000 description 1
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- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- 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
- C07F15/00—Compounds containing elements of Groups 8, 9, 10 or 18 of the Periodic Table
- C07F15/0006—Compounds containing elements of Groups 8, 9, 10 or 18 of the Periodic Table compounds of the platinum group
- C07F15/0086—Platinum compounds
- C07F15/0093—Platinum compounds without a metal-carbon linkage
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D257/00—Heterocyclic compounds containing rings having four nitrogen atoms as the only ring hetero atoms
- C07D257/02—Heterocyclic compounds containing rings having four nitrogen atoms as the only ring hetero atoms not condensed with other rings
- C07D257/04—Five-membered rings
Definitions
- the present invention relates to a tetrazolato-crosslinked platinum complex compound, a method for producing the platinum complex compound, and use thereof.
- This application claims priority based on Japanese Patent Application No. 2008-007357 filed on Jan. 16, 2008, the entire contents of which are incorporated herein by reference. Yes.
- Cisplatin cis-diamminedichloroplatinum (II)
- cisplatin analogs of carboplatin, nedaplatin and oxaliplatin have been used clinically as a response to side effects or cancer cell resistance in cisplatin therapy. It is considered that the mechanism of action of cisplatin and the metabolic pathway in the body are involved in that the complex forms a 1,2-strand crosslink with the intracellular DNA strand and causes significant distortion in the DNA strand.
- Non-Patent Document 1 The above platinum preparation having a structure similar to cisplatin is considered to bind to DNA in the same manner.
- Patent Document 1 and Non-Patent Documents 2 and 3 are cited as prior art documents related to this type of technology.
- the platinum complex compound represented by is provided.
- A is tetrazolato which may be substituted
- B is an organic or inorganic anion
- m and n correspond to the number of charges of the platinum complex part (complex ion in square brackets) and the number of charges of the anion. It is an integer determined by
- tetrazolato means an anion obtained in general by deprotonation of 1H-tetrazole-based compound (1H-tetrazole with or without substituent at C5 position) (withdrawal of proton at N1 position). It is a term to refer to. That is, it means a general anion obtained by dissociating the proton at the N1 position of the 1H-tetrazole compound.
- N1 and N2 of the tetrazole ring constituting A are coordinated to two platinum ions, respectively, depending on the cross-linking aspect of A to two platinum (II) ions forming the coordination center.
- a preferred embodiment of the compound disclosed herein is a platinum complex compound having an N2, N3-crosslinked structure.
- Such a platinum complex compound having a crosslinked structure may be more useful as an active ingredient of an anticancer agent or other drugs (for example, exhibiting higher cytotoxicity).
- an N2, N3-bridged platinum complex compound in which A in formula (I) is tetrazolato having no substituent is particularly preferable.
- an N2, N3-bridged platinum complex compound in which A in the formula (I) is a tetrazolato having a substituent (that is, a substituent bonded to C at the 5-position of the tetrazole ring).
- the substituent may be linear, branched or cyclic, and may further have a substituent during the substitution period.
- Rx is an alkyl group having 1 to 4 carbon atoms.
- any of the platinum complex compounds disclosed herein can be used in accordance with the pathological usage of cisplatin.
- at least one of the platinum complex compounds can be used as one of the active ingredients of the anticancer agent.
- B in the above formula (I) is preferably a pharmacologically acceptable anion.
- the platinum complex compound represented by the above formula (I) has the following formula (II): And a 1H-tetrazole-based compound with or without a substituent in a molar ratio of 1: 1 to 1: 1.2.
- this step when a mixture of the N1, N2-bridged platinum complex compound and the N2, N3-bridged platinum complex compound is produced, according to the present invention, one of the two compounds contained in the mixture is changed from the other one to the other. By separating, at least one of the above compounds can be purified.
- reverse phase chromatography using an aqueous perchlorate solution as a mobile phase is used in the step of separating at least one of the compounds from the mixture.
- the perchlorate in the aqueous solution is preferably lithium perchlorate.
- FIG. 1 is a 1 H-NMR spectrum of the mixture obtained in Example 1.
- FIG. 2 is a 1 H-NMR spectrum of 5-H—N1, N2 obtained in Example 3.
- FIG. 3 is a 1 H-NMR spectrum of 5-H—N2, N3 obtained in Example 3.
- FIG. 4 is a 1 H-NMR spectrum of the mixture obtained in Example 4.
- FIG. 5 is a mass spectrum of 5-H—N1, N2 obtained in Example 3.
- FIG. 6 is a mass spectrum of 5-H—N2, N3 obtained in Example 3.
- FIG. 7 is a mass spectrum of 5-methyl-N2, N3 obtained in Example 5.
- FIG. 8 is a mass spectrum of 5-ethyl acetate-N2, N3 obtained in Example 6.
- FIG. 1 is a 1 H-NMR spectrum of the mixture obtained in Example 1.
- FIG. 2 is a 1 H-NMR spectrum of 5-H—N1, N2 obtained in Example 3.
- FIG. 3 is a 1 H-NMR spectrum of 5-H—N2, N
- FIG. 9 is a mass spectrum of 5-acetate-N2, N3 obtained in Example 7.
- FIG. 10 is a mass spectrum of 5-phenyl-N2, N3 obtained in Example 8.
- FIG. 11 shows the crystal structure of 5-methyl obtained by X-ray analysis.
- FIG. 12 shows the crystal structure of 5-acetate obtained by X-ray analysis.
- the platinum complex compound disclosed here is tetrazolato in which A in the above formula is obtained by deprotonation of a 1H-tetrazole-based compound (withdrawal of proton at the N1 position).
- A is preferably tetrazolato having a hydrogen atom or a lower hydrocarbon group at the C5 position.
- B in the above formula is not particularly limited, and may be, for example, one or more selected from inorganic acid ions and organic acid ions.
- inorganic acid ions include chloride, bromide, nitrate, phosphate, sulfate, perchlorate, and the like.
- Examples of the organic acid ion include acetate, citrate, lactate, maleate, tartrate, and bezelate.
- the complex compound represented by the above formula (I) can exist as a hydrate. Therefore, the platinum complex compound provided by the present invention may include a hydrate of the compound represented by the above formula (I).
- M and n in the above formula are integers determined in accordance with the number of charges of the platinum complex part (complex ion in square brackets) and the number of charges of the anion of B.
- the charge of each platinum (II) ion is +2, and the charge of the hydroxyl group is -1. Therefore, for example, when A is a tetrazolato having no substituent or a substituent having no charge, the charge on the tetrazolato ring is ⁇ 1, so the number of charges in the platinum complex portion is +2. Therefore, if the charge of B is ⁇ 2, m and n are both 1, and if the charge of B is ⁇ 1, m is 1 and n is 2.
- any of the platinum complex compounds disclosed herein can be used in accordance with the pathological usage of cisplatin.
- B in the formula (I) is preferably a pharmacologically acceptable anion.
- Such a platinum complex compound can be used, for example, as an anticancer agent in the same manner as cisplatin.
- any one of the above platinum complex compounds may be included, or two or more thereof may be included.
- the administration method is not particularly limited as long as the pharmacological effect is obtained.
- a platinum complex compound dissolved in physiological saline or the like can be administered to a patient by intravenous injection.
- the platinum complex compound according to the present invention is prepared by reacting a compound represented by the formula (II) (starting material) with a 1H-tetrazole compound at a molar ratio of 1: 1 to 1: 1.2 in an appropriate solvent. It can manufacture preferably by the manufacturing method containing. Here, if the amount of 1H-tetrazole compound used is too much than the above molar ratio, a large amount of by-products (products other than the platinum complex compound represented by formula (I), that is, impurities) are generated. The separation and purification of the target product may be difficult.
- the 1H-tetrazole compound is added to a solution in which the starting material is dissolved in an appropriate solvent.
- the solvent that can be used is not particularly limited as long as it can dissolve the starting material and does not inhibit the formation of a desired platinum complex compound, but is preferably water (distilled water).
- the 1H-tetrazole compound can be added at once or in several portions.
- a solution in which the compound is dissolved in an appropriate solvent may be added at once or in several portions, or may be gradually added dropwise. May be.
- an embodiment in which the 1H-tetrazole-based compound solution is added at once can be preferably employed.
- the obtained reaction solution is preferably stirred under light shielding.
- the temperature at this time is not particularly limited as long as the reaction is not impaired, but is preferably about 25 to 55 ° C, more preferably 35 to 45 ° C, and further preferably about 40 ° C.
- the reaction time is not particularly limited as long as the yield is not significantly reduced, but is preferably 24 hours to 64 hours, more preferably 36 hours to 52 hours, and further preferably 40 hours to 48 hours.
- the starting material represented by the above formula (II) (for example, a compound represented by the formula [ ⁇ cis-Pt (NH 3 ) 2 ⁇ ( ⁇ -OH)] 2 (NO 3 ) 2 ) is publicly known. It can be synthesized according to the synthesis method. For example, R. Faggiani.
- 1H-tetrazole compound 1H-tetrazole having a hydrogen atom or a lower hydrocarbon group at the C5 position is preferable, and 1H-tetrazole having a hydrogen atom at the C5 position is particularly preferable.
- 1H-tetrazole having a hydrogen atom at the C5 position a mixture of N1, N2-bridged platinum complex compound and N2, N3-bridged platinum complex compound (mixture of two structural isomers) can be generated by the above reaction.
- the mixture contains almost no by-products (impurities) other than these structural isomers. Therefore, it is easy to handle due to characteristics such as extremely low hygroscopicity compared to the mixture containing a large amount of impurities.
- a mixture of isomers that are structurally very similar to each other as described above is highly difficult to separate and purify.
- at least one structural isomer is removed from the mixture.
- the isomers contained in the above mixture can be efficiently purified to high purity.
- a reverse phase chromatograph is used.
- the chromatograph to be used a commercially available one can be used, and for example, a high performance liquid chromatograph or an intermediate pressure preparative chromatograph can be preferably used. Particularly preferably, an intermediate pressure preparative chromatograph is used.
- the column to be used is not particularly limited as long as it enables separation and purification of the target product, but an ODS (C 18 ) column is preferably used.
- ODS column for example, trade name “Ultra Pack” of Yamazen Co., Ltd. can be preferably used.
- the mobile phase is not particularly limited as long as at least one structural isomer can be separated from the mixture, but a perchlorate solution (typically an aqueous solution) is preferably used.
- the perchlorate is not particularly limited as long as the obtained platinum complex compound is not impaired, but is preferably a lithium salt, a sodium salt or the like, and the use of a lithium salt is particularly preferred.
- purification can be performed simply. That is, the perchlorate can be easily removed by washing the platinum complex compound obtained by freeze-drying the collected solution with a small amount of alcohol (methanol, ethanol, propanol, etc.).
- the concentration of the perchlorate solution may be set so that the pH of the solution is about 2.5 to 3.5 (eg, about 3.0).
- the lithium perchlorate concentration in the solution is adjusted to about 0.1 M because the pH is within the above range.
- Other matters may be appropriately set according to the amount of sample to be injected.
- a tetrazolato-bridged platinum complex compound having a substituent at the C5 position can also be produced.
- the substituent is not particularly limited and may be linear, branched or cyclic. Particularly preferred is a lower hydrocarbon group.
- a lower alkyl group having 1 to 6 carbon atoms for example, a methyl group, an ethyl group, a propyl group, an isopropyl group, etc.
- an aryl group for example, a phenyl group.
- the substituent may be further substituted.
- it may be a lower alkyl group substituted by an acetate group or an ethyl acetate group.
- Other examples of the substituent at the C5 position include an amino group (N may be a + 1-charged or non-charged amino group), a methylthio group, a carboxamide group, and the like.
- the technique disclosed in this specification includes a method for producing a platinum complex compound in which A in the above formula (I) is a tetrazolato having a substituent, and the compound represented by the above formula (II)
- a method for producing a platinum complex compound comprising reacting a 1H-tetrazole compound having a substituent with a molar ratio of 1: 1 to 1: 1.2 is included.
- the substituent of the 1H-tetrazole compound used here may be the same group as the substituent of A in formula (I), and the compound represented by formula (I) and the 1H-tetrazole compound It may be a group that can be converted into the substituent of A by a simple process after reacting.
- Example 1 the compound represented by the formula (II) is reacted with 1H-tetrazole (that is, 1H-tetrazole-based compound having no substituent) at a molar ratio of 1: 1.1. )
- 1H-tetrazole that is, 1H-tetrazole-based compound having no substituent
- the white powder is an N1, N2 bridged platinum complex compound [ ⁇ cis-Pt (NH 3 ) 2 ⁇ 2 ( ⁇ -OH) ( ⁇ -tetrazolato-N1, N2)] ( NO 3 ) 2 and N2, N3 bridged platinum complex compound [ ⁇ cis-Pt (NH 3 ) 2 ⁇ 2 ( ⁇ -OH) ( ⁇ -tetrazolato-N2, N3)] (NO 3 ) 2 It was a mixture containing a molar ratio of 6.5: 3.5 and contained almost no other impurities. The white powder was easy to handle.
- Example 2 By repeatedly recrystallizing the mixture obtained in Example 1 (Sample 1) from water, N2, N3-crosslinked platinum until the molar ratio of N1, N2 crosslinked type to N1, N2 crosslinked type is about 4: 6. The complex compound was purified (Sample 2).
- Cytotoxicity of sample 1, sample 2 and cisplatin (sample 3) as a comparative example was evaluated by the following method.
- ⁇ Examination of in vitro cytotoxicity (cancer cell growth inhibitory activity) on H460 non-small lung cancer cells The day before the drug was added, H460 non-small lung cancer cells were plated at 12,000 to 20,000 cells / well on a 24-well flat bottom microplate. Each aqueous solution was prepared by dissolving each sample (see the sample number in Table 1) in QH 2 O water to a concentration of 100 ⁇ M. 1 mL of solutions having various concentrations obtained by diluting these aqueous solutions were injected into each well. After incubating the microplate at 37 ° C.
- the IC 50 value was calculated as the concentration at which the amount of formazan produced was 50%, compared with the control to which no drug was added. The results are shown in Table 1. It was found that Sample 2 obtained by roughly purifying the N2, N3-bridged platinum complex compound showed higher cytotoxicity.
- Example 3 the mixture obtained in Example 1 was highly separated and purified into N1, N2 cross-linked type and N1, N2 cross-linked type. That is, the above mixture was separated by medium pressure preparative chromatography. The separation was performed using the medium pressure preparative chromatograph “YFLC-prep” of Yamazen Co., Ltd. under the following conditions.
- the 5-H—N1, N2 corresponds to a platinum complex compound in which the substituent A in the above formula (I) is a group represented by the following formula (III).
- 5-H—N2, N3 corresponds to a platinum complex compound in which the substituent A in the above formula (I) is a group represented by the following formula (IV).
- the final yield calculated by dividing the sum of the yields of 5-H—N1, N2 and 5-H—N2, N3 after separation and purification by the theoretical yield was 56.5%.
- the yields of 5-H—N1, N2 (sample 4) and 5-H—N2, N3 (sample 5) after separation and purification were 36.5% and 20.0%, respectively.
- the structural analysis data (after separation and purification) used for the identification of 5-H-N1, N2 and 5-H-N2, N3 is shown below (NMR spectroscopy: Varian INOVA 500, mass spectrometer: JOEL JMX-700) .
- the NMR spectra of 5-H—N1, N2 and 5-H—N2, N3 are shown in FIGS. 2 and 3, respectively, and their mass spectra are shown in FIGS. 5 and 6, respectively.
- Example 4 In this example, the compound represented by the formula (II) and 1H-tetrazole (that is, 1H-tetrazole compound having no substituent) were reacted at a molar ratio of 1: 4. That is, the amount of 1H-tetrazole used relative to [ ⁇ cis-Pt (NH 3 ) 2 ⁇ ( ⁇ -OH)] 2 (NO 3 ) 2 was 4 equivalents. Otherwise in the same manner as in Example 1, a product was obtained. As is apparent from the NMR spectrum of FIG.
- this product is an N1, N2 bridged platinum complex compound [ ⁇ cis-Pt (NH 3 ) 2 ⁇ 2 ( ⁇ -OH) ( ⁇ -tetrazolato-N1, N2 )] (NO 3 ) 2 and N2, N3 bridged platinum complex compounds [ ⁇ cis-Pt (NH 3 ) 2 ⁇ 2 ( ⁇ -OH) ( ⁇ -tetrazolato-N2, N3)] (NO 3 ) 2
- it contains at least one kind of by-product (impurities) and is very hygroscopic and difficult to handle.
- the yield of the mixture containing impurities (crude product) was 10% or less. If the mixture is separated and purified according to the method of Example 1, the total yield of structural isomers is further reduced to nearly half. This is about 1/9 or less when the production method according to the present invention is followed.
- Example 5 a platinum complex compound in which A in Formula (I) is tetrazolato having a methyl group at the C5 position was synthesized. That is, 0.150 g of 1H-5-methyltetrazole (Aldrich) was added to a solution of 1.0 g of [ ⁇ cis-Pt (NH 3 ) 2 ⁇ ( ⁇ -OH)] 2 (NO 3 ) 2 dissolved in 30 mL of distilled water. (1.1 equivalent) was added, and the resulting reaction solution was stirred at 40 ° C. for about 40 hours in the dark. The reaction solution was concentrated under reduced pressure at 30 ° C.
- 1H-5-methyltetrazole Aldrich
- the structural analysis data (measured with the same analytical instrument as in Example 3) used for the identification of 5-methyl-N2, N3 is shown below. Further, the mass spectrum of 5-methyl-N2, N3 is shown in FIG. 7, and the crystal structure by X-ray analysis is shown in FIG.
- Example 6 a platinum complex compound in which A in formula (I) is a tetrazolato having an ethyl acetate group at the C5 position was synthesized. That is, ethyl-1H-tetrazole-5-acetate (Aldrich) was added to a solution of 1.0 g of [ ⁇ cis-Pt (NH 3 ) 2 ⁇ ( ⁇ -OH)] 2 (NO 3 ) 2 dissolved in 38 mL of distilled water. 0.279 g (1.1 equivalent) was added, and the resulting reaction solution was stirred at 40 ° C. for about 48 hours in the dark. The reaction solution was concentrated under reduced pressure at 40 ° C.
- This compound is a platinum complex compound in which A in the formula (I) is a group represented by the following formula (VI). Hereinafter, the compound is referred to as 5-ethyl acetate-N2, N3 (sample 7).
- Example 7 a platinum complex compound in which A in Formula (I) is a tetrazolato having an acetate group at the C5 position was synthesized by converting the substituent of the compound obtained in Example 6 by a simple process. That is, 0.2 g of [ ⁇ cis-Pt (NH 3 ) 2 ⁇ 2 ( ⁇ -OH) ( ⁇ -tetrazolato-5-ethylacetate-N2, N3)] (NO 3 ) 2 obtained in Example 6 was distilled water. To the solution dissolved in 5 mL, 300 ⁇ L of 1M lithium hydroxide solution was added, and the resulting reaction solution was stirred at room temperature for about 10 minutes.
- reaction solution was adjusted to pH 7 with 0.1 M nitric acid aqueous solution and concentrated under reduced pressure using a rotary evaporator.
- the resulting white powder was washed with 2-propanol and diethyl ether and collected by filtration, and then dried with a vacuum desiccator, and [ ⁇ cis-Pt (NH 3 ) 2 ⁇ 2 ( ⁇ -OH) ( ⁇ -tetrazolato-5- acetate-N2, N3)] (NO 3 ) 2 0.15 g was obtained.
- This compound is a platinum complex compound in which A in the formula (I) is a group represented by the following formula (VII). Hereinafter, the compound is referred to as 5-acetate-N2, N3.
- FIG. 9 shows the mass spectrum of 5-acetate-N2, N3, and FIG. 12 shows the crystal structure by X-ray analysis.
- Example 8 a platinum complex compound in which A in formula (I) is a tetrazolato having a phenyl group at the C5 position was synthesized. That is, a solution obtained by dissolving 1.0 g of [ ⁇ cis-Pt (NH 3 ) 2 ⁇ ( ⁇ -OH)] 2 (NO 3 ) 2 in 40 mL of distilled water, 1H-5-phenyltetrazole (Aldrich) A solution of 273 g (1.1 equivalent) dissolved in 10 mL of methanol was mixed, and the resulting reaction solution was stirred at 40 ° C. for about 48 hours under light shielding. The obtained white suspension was concentrated under reduced pressure at 30 ° C.
- AMPZ (sample 8) in Table 2 is a pyrazolato-bridged platinum (NO 3 ) 2 represented by the formula [ ⁇ cis-Pt (NH 3 ) 2 ⁇ 2 ( ⁇ -OH) ( ⁇ -pyrazolato)] (NO 3 ) 2.
- AMTA (sample 9) has the formula [ ⁇ cis-Pt (NH 3 ) 2 ⁇ 2 ( ⁇ -OH) ( ⁇ -1,2,3-triazolato-N1, N2)] (NO 3 )
- a 1,2,3-triazolate-bridged platinum (II) binuclear complex represented by 2 These AMPZ and AMTA are known to exhibit a spectrum of anticancer activity different from that of cisplatin (Non-patent Document 3), and bind to DNA strands to form 1,2-strand crosslinks. It has been observed that DNA strands are not subject to significant distortion as described above. That is, these azolate-bridged platinum (II) binuclear complexes are considered to bind to DNA in a manner different from any of the above cisplatin-based preparations.
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Abstract
Description
なお、本出願は2008年1月16日に出願された日本国特許出願第2008-007357号に基づく優先権を主張しており、その出願の全内容は本明細書中に参照として組み入れられている。
シスプラチンの作用機序や体内代謝経路には、該錯体が細胞内のDNA鎖と1,2-鎖内架橋を形成しDNA鎖に顕著な歪みを生じさせることが関与していると考えられている(非特許文献1)。シスプラチンと類似した構造を有する上記の白金製剤も同様の態様でDNAに結合すると考えられる。
また、上記式中のBは特に制限されず、例えば無機酸イオンおよび有機酸イオンから選択される一種または二種以上であり得る。無機酸イオンとしては、例えば、クロリド、ブロミド、ニトラート、ホスファート、スルファート、ペルクロラート等が挙げられる。有機酸イオンとしては、例えば、アセタート、シトラート、ラクタート、マレアート、タルトラート、ベジラート等が挙げられる。なお、上記式(I)により表される錯体化合物は水和物として存在し得る。したがって、本発明により提供される白金錯体化合物には、上記式(I)で表される化合物の水和物が包含され得る。
使用するカラムとしては、目的物の分離精製を可能にするものであれば特に制限はないが、好適にはODS(C18)カラムを用いる。該ODSカラムとしては、例えば、山善株式会社の商品名「ウルトラパック」を好ましく採用することができる。
なお、以下に示す例1、例4~6、例8の出発物質である[{cis-Pt(NH3)2}(μ-OH)]2(NO3)2としては、上記非特許文献4に従って合成したものを用いた。
本例は、式(II)で表される化合物と1H-テトラゾール(すなわち、置換基を有しない1H-テトラゾール系化合物)とを1:1.1のモル比で反応させることにより、式(I)におけるAが置換基を有しないテトラゾラトである白金錯体化合物を合成した例である。
すなわち、[{cis-Pt(NH3)2}(μ-OH)]2(NO3)22.0gを蒸留水75mLに溶解させた溶液に1H-テトラゾール(同仁化学)0.252g(1.1当量)を加え、得られた反応液を遮光下40℃で約40時間攪拌した。この反応液を、ロータリーエバポレーターを用いて、得られた白金錯体のポリマー化反応を避けるため30℃以下で減圧濃縮し、残った粗生成物をメタノールおよびジエチルエーテルで洗浄・濾取した後、真空デシケータで乾燥させて白色粉末1.9gを得た。この白色粉末の1H-NMRスペクトル(VarianMercury300NMR)を図1に示す。このNMRスペクトルからわかるように、上記白色粉末は、N1,N2架橋型の白金錯体化合物[{cis-Pt(NH3)2}2(μ-OH)(μ-tetrazolato-N1,N2)](NO3)2と、N2,N3架橋型の白金錯体化合物[{cis-Pt(NH3)2}2(μ-OH)(μ-tetrazolato-N2,N3)](NO3)2とを約6.5:3.5のモル比で含む混合物であり、他の不純物はほとんど含まれていなかった。また、上記白色粉末は取扱い容易であった。
例1により得られた混合物(サンプル1)を繰り返し水から再結晶することにより、N1,N2架橋型とN1,N2架橋型とのモル比が4:6程度となるまでN2,N3-架橋白金錯体化合物を精製した(サンプル2)。
<H460非小肺癌細胞に対するインヴィトロ細胞毒性(癌細胞増殖抑制活性)の検討>
薬物を添加する日の前日に、24ウェル平底マイクロプレート上にH460非小肺癌細胞を12,000~20,000個/ウェルとなるようにプレートした。各サンプル(表1中のサンプル番号参照)のそれぞれを濃度が100μMとなるようにQ-H2O水に溶解して各水溶液を用意した。これらの水溶液を希釈して得られた様々な濃度の溶液1mLを各ウェルに注入した。このマイクロプレートを37℃で24時間培養した後、200μLの臭化2,5-ジフェニル-3-(4,5-ジメチルチアゾール-2-イル)テトラゾリウム(MTT)溶液(5mg/mL)を各ウェルに加え、37℃でさらに4時間培養した。MTTの還元により生成・析出したフォルマザンを溶解するため、各ウェルにジメチルスルフォキシド(DMSO)200μLを加えた。マイクロプレートレーダーを用いて各ウェルの550nmにおける吸光度を測定した。
各ウェルの吸光度を3回測定し、各実験を少なくとも3回繰り返した。IC50値は薬剤を添加しなかったコントロールと比較して、フォルマザン生成量が50%となる濃度として算出した。
その結果を表1に示す。N2,N3-架橋白金錯体化合物を粗精製してなるサンプル2はより高い細胞毒性を示すことがわかった。
本例では、例1で得られた混合物をN1,N2架橋型とN1,N2架橋型とに高度に分離精製した。
すなわち、上記混合物を中圧分取クロマトグラフィーにより分離した。当該分離は、山善株式会社の中圧分取クロマトグラフ装置「YFLC-prep」を使用して、以下の条件により行った。
移動相:0.1M過塩素酸リチウム(pH3.0)
カラム:φ26mm×300mmウルトラパックODSカラム(山善株式会社)
検出波長:254nm
流速:20mL/min
サンプル注入量:1回5mL
それぞれの溶離液を凍結乾燥して得られた白色粉末をジエチルエーテルで洗浄して、N1,N2架橋型の白金錯体化合物[{cis-Pt(NH3)2}2(μ-OH)(μ-tetrazolato-N1,N2)](ClO4)2(以下、5-H-N1,N2という。)0.86g、および、N2,N3架橋型の白金錯体化合物[{cis-Pt(NH3)2}2(μ-OH)(μ-tetrazolato-N2,N3)](ClO4)2(以下、5-H-N2,N3という。)0.47gを得た。この5-H-N1,N2は、上記式(I)における置換基Aが下記式(III)で表される基である白金錯体化合物に該当する。また、5-H-N2,N3は、上記式(I)における置換基Aが下記式(IV)で表される基である白金錯体化合物に該当する。
分離精製後の5-H-N1,N2および5-H-N2,N3の収量の和を理論収量で除して算出した最終収率は56.5%であった。また、分離精製後の5-H-N1,N2(サンプル4)および5-H-N2,N3(サンプル5)の収率は、それぞれ36.5%および20.0%であった。
NMR分析
1H-NMR(D2O,TSP-d4):δ(ppm)8.84(s,1H,NH)
13C-NMR(D2O,TSP-d4):δ(ppm)152.6
195Pt-NMR(D2O,Na2PtCl6):δ(ppm)-2127,-2177
質量分析(ESI)
[M-H+]:542.2(理論値543.1)
[M+ClO4 -]:642.8(理論値643.0)
(M=[{cis-Pt(NH3)2}2(μ-OH)(μ-tetrazolato-N1,N2)]2+)
NMR分析
1H-NMR(D2O,TSP-d4):δ(ppm)8.66(s,1H,NH)
13C-NMR(D2O,TSP-d4):δ(ppm)152.6
195Pt-NMR(D2O,Na2PtCl6):δ(ppm)-2192
質量分析(ESI)
[M-H+]:542.2(理論値543.1)
[M+ClO4 -]:642.8(理論値643.0)
(M=[{cis-Pt(NH3)2}2(μ-OH)(μ-tetrazolato-N2,N3)]2+)
本例では、式(II)で表される化合物と1H-テトラゾール(すなわち、置換基を有しない1H-テトラゾール系化合物)とを1:4のモル比で反応させた。すなわち、[{cis-Pt(NH3)2}(μ-OH)]2(NO3)2に対する1H-テトラゾールの使用量を4当量とした。その他の点は例1と同様にして生成物を得た。この生成物は、図4のNMRスペクトルから明らかなように、N1,N2架橋型の白金錯体化合物[{cis-Pt(NH3)2}2(μ-OH)(μ-tetrazolato-N1,N2)](NO3)2およびN2,N3架橋型の白金錯体化合物[{cis-Pt(NH3)2}2(μ-OH)(μ-tetrazolato-N2,N3)](NO3)2の他に、少なくとも1種の副生成物(不純物)を含み、吸湿性が非常に高く取り扱いが困難であった。また、不純物を含む該混合物(粗生成物)の収率は10%以下であった。仮に実施例1の方法に従って該混合物の分離精製を行うと、構造異性体の総収率はさらにその半分近くまで下がることになる。これは本発明による製造方法に従った場合の約9分の1以下である。
本例では、式(I)におけるAがC5位にメチル基を有するテトラゾラトである白金錯体化合物を合成した。
すなわち、[{cis-Pt(NH3)2}(μ-OH)]2(NO3)2 1.0gを蒸留水30mLに溶解させた溶液に1H-5-メチルテトラゾール(アルドリッチ)0.150g(1.1等量)を加え、得られた反応液を遮光下40℃で約40時間攪拌した。この反応液をロータリーエバポレーターを用いて30℃以下で減圧濃縮し、残った粗生成物を再結晶(50%(v/v)2-メチル-2,4-ペンタンジオール水溶液)により精製し、[{cis-Pt(NH3)2}2(μ-OH)(μ-5-methyltetrazolato-N2,N3)](NO3)2 0.15gを得た。この化合物は、式(I)におけるAが下記式(V)で表される基である白金錯体化合物である。以下、当該化合物を5-メチル-N2,N3(サンプル6)という。
1H-NMR(D2O,TSP-d4):δ(ppm)2.64(s,3H,CH3)
13C-NMR(D2O,TSP-d4):δ(ppm)10.1,162.2
195Pt-NMR(D2O,Na2PtCl6):δ(ppm)-2179
質量分析(ESI)
[M-H+]:556.3(理論値557.1)
(M=[{cis-Pt(NH3)2}2(μ-OH)(μ-5-methyltetrazolato-N2,N3)]2+)
本例では、式(I)におけるAがC5位にエチルアセテート基を有するテトラゾラトである白金錯体化合物を合成した。
すなわち、[{cis-Pt(NH3)2}(μ-OH)]2(NO3)2 1.0gを蒸留水38mLに溶解させた溶液にエチル-1H-テトラゾール-5-アセテート(アルドリッチ)0.279g(1.1等量)を加え、得られた反応液を遮光下40℃で約48時間攪拌した。この反応液をロータリーエバポレーターを用いて40℃で減圧濃縮し、得られた白色粉末を2-プロパノールおよびジエチルエーテルで洗浄・濾取した後、真空デシケータで乾燥させ、[{cis-Pt(NH3)2}2(μ-OH)(μ-tetrazolato-5-ethylacetate-N2,N3)](NO3)2 0.8gを得た。この化合物は、式(I)におけるAが下記式(VI)で表される基である白金錯体化合物である。以下、当該化合物を5-エチルアセテート-N2,N3(サンプル7)という。
1H-NMR(D2O,TSP-d4):δ(ppm)1.28(t,3H,CH3),4.11(s,2H,CH2),
4.24(q,2H,CH2)
13C-NMR(D2O,TSP-d4):δ(ppm)16.1,34.2,65.7,174.0
195Pt-NMR(D2O,Na2PtCl6):δ(ppm)-2182
質量分析(ESI)
[M-H+]:628.7(理論値629.4)
(M=[{cis-Pt(NH3)2}2(μ-OH)(μ-tetrazolato-5-ethylacetate-N2,N3)]2+)
本例では、例6で得られた化合物の置換基を簡単な工程により変換することで、式(I)におけるAがC5位にアセテート基を有するテトラゾラトである白金錯体化合物を合成した。
すなわち、例6で得られた[{cis-Pt(NH3)2}2(μ-OH)(μ-tetrazolato-5-ethylacetate-N2,N3)](NO3)2 0.2gを蒸留水5mLに溶解させた溶液に1Mの水酸化リチウム溶液300μLを加え、得られた反応液を室温で約10分間攪拌した。この反応液を0.1M硝酸水溶液でpH7に調節し、ロータリーエバポレータを用いて減圧濃縮した。得られた白色粉末を2-プロパノールおよびジエチルエーテルで洗浄・濾取した後、真空デシケータで乾燥させ、[{cis-Pt(NH3)2}2(μ-OH)(μ-tetrazolato-5-acetate-N2,N3)](NO3)2 0.15gを得た。この化合物は、式(I)におけるAが下記式(VII)で表される基である白金錯体化合物である。以下、当該化合物を5-アセテート-N2,N3という。
1H-NMR(D2O,TSP-d4):δ(ppm)3.84(s,2H,CH2)
13C-NMR(D2O,TSP-d4):δ(ppm)37.0,164.1,179.2
195Pt-NMR(D2O,Na2PtCl6):δ(ppm)-2181
[M-H+]:600.5(理論値600.4)
(M=[{cis-Pt(NH3)2}2(μ-OH)(μ-tetrazolato-5-acetate-N2,N3)]+)
本例では、式(I)におけるAがC5位にフェニル基を有するテトラゾラトである白金錯体化合物を合成した。
すなわち、[{cis-Pt(NH3)2}(μ-OH)]2(NO3)2 1.0gを蒸留水40mLに溶解させた溶液と、1H-5-フェニルテトラゾール(アルドリッチ)0.273g(1.1等量)をメタノール10mLに溶解した溶液とを混合し、得られた反応液を遮光下40℃で約48時間攪拌した。得られた白色の懸濁液をロータリーエバポレーターを用いて30℃以下で減圧濃縮し、残った粗生成物にメタノール200mLを加え、メタノール不溶分を濾過により除去した。ろ液を減圧濃縮し、残った白色粉末をジエチルエーテルで洗浄・濾取し、真空デシケータ中で乾燥させた後、再結晶(60%(v/v)メタノール水溶液)により精製し、[{cis-Pt(NH3)2}2(μ-OH)(μ-5-phenyltetrazolato-N2,N3)](NO3)2 0.55gを得た。この化合物は、式(I)におけるAが下記式(VIII)で表される基である白金錯体化合物である。以下、当該化合物を5-フェニル-N2,N3という。
1H-NMR(D2O,TSP-d4):δ(ppm)7.60(1H,p-CH),7.62(2H,CH),
8.06(2H,CH)
13C-NMR(D2O,TSP-d4):δ(ppm)129.4,129.4,132.1,133.7,166.3
195Pt-NMR(D2O,Na2PtCl6):δ(ppm)-2185
質量分析(ESI)
[M-H+]:618.6(理論値619.4)
(M=[{cis-Pt(NH3)2}2(μ-OH)(μ-5-phenyltetrazolato-N2,N3)]2+)
ここで、表2中のAMPZ(サンプル8)は式[{cis-Pt(NH3)2}2(μ-OH)(μ-pyrazolato)](NO3)2で表されるピラゾラト架橋白金(II)二核錯体であり、AMTA(サンプル9)は式[{cis-Pt(NH3)2}2(μ-OH)(μ-1,2,3-triazolato-N1,N2)](NO3)2で表される1,2,3-トリアゾラト架橋白金(II)二核錯体である。これらAMPZおよびAMTAは、シスプラチンとは異なる抗癌活性スペクトルを示すことが知られており(非特許文献3)、またDNA鎖と結合して1,2-鎖内架橋を形成するが結合部分のDNA鎖に上記のような顕著な歪みを及ぼさないことが観察されている。すなわち、これらのアゾラト架橋白金(II)二核錯体は、上記シスプラチン系製剤のいずれとも異なる態様でDNAに結合すると考えられる。
Claims (8)
- 前記白金錯体部は、前記Aを構成するテトラゾール環の2位および3位のNが二つの白金イオンにそれぞれ配位したN2,N3-架橋構造を有する、請求項1に記載の白金錯体化合物。
- 前記Aは置換基を有しないテトラゾラトである、請求項2に記載の白金錯体化合物。
- 前記Aは置換基を有するテトラゾラトであり、該置換基は、炭素数1~6の炭化水素基、-CH2COO-および-CH2COORx(ここで、Rxは炭素数1~4のアルキル基である。)からなる群から選択されるいずれかである、請求項2に記載の白金錯体化合物。
- 請求項1から4のいずれかに記載の白金錯体化合物を有効成分として含む、抗癌剤。
- 請求項1から4のいずれかに記載の白金錯体化合物を製造する方法であって、
次式(II):
で表される化合物と、置換基を有するまたは有しない1H-テトラゾールとを、1:1~1:1.2のモル比で反応させて、N1,N2-架橋白金錯体化合物とN2,N3-架橋白金錯体化合物との混合物を得る工程と、
該混合物に含まれるN1,N2-架橋白金錯体化合物およびN2,N3-架橋白金錯体化合物のいずれか一方から他方を分離することにより前記白金錯体化合物の少なくともいずれかを精製する工程と、
を包含する、白金錯体化合物製造方法。 - 前記白金錯体化合物を精製する工程は、移動相として過塩素酸塩溶液を用いた逆相クロマトグラフィにより行う、請求項6に記載の方法。
- 前記過塩素酸が過塩素酸リチウムである、請求項7に記載の方法。
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