WO2014061508A1 - キラルな4-ボロノフェニルアラニン(bpa)誘導体と製造方法、およびその誘導体を用いた18f標識化bpaの製造方法 - Google Patents
キラルな4-ボロノフェニルアラニン(bpa)誘導体と製造方法、およびその誘導体を用いた18f標識化bpaの製造方法 Download PDFInfo
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- C07C229/04—Compounds containing amino and carboxyl groups bound to the same carbon skeleton having amino and carboxyl groups bound to acyclic carbon atoms of the same carbon skeleton the carbon skeleton being acyclic and saturated
- C07C229/06—Compounds containing amino and carboxyl groups bound to the same carbon skeleton having amino and carboxyl groups bound to acyclic carbon atoms of the same carbon skeleton the carbon skeleton being acyclic and saturated having only one amino and one carboxyl group bound to the carbon skeleton
- C07C229/08—Compounds containing amino and carboxyl groups bound to the same carbon skeleton having amino and carboxyl groups bound to acyclic carbon atoms of the same carbon skeleton the carbon skeleton being acyclic and saturated having only one amino and one carboxyl group bound to the carbon skeleton the nitrogen atom of the amino group being further bound to hydrogen atoms
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- C07C229/34—Compounds containing amino and carboxyl groups bound to the same carbon skeleton having amino and carboxyl groups bound to acyclic carbon atoms of the same carbon skeleton the carbon skeleton containing six-membered aromatic rings
- C07C229/36—Compounds containing amino and carboxyl groups bound to the same carbon skeleton having amino and carboxyl groups bound to acyclic carbon atoms of the same carbon skeleton the carbon skeleton containing six-membered aromatic rings with at least one amino group and one carboxyl group bound to the same carbon atom of the carbon skeleton
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- C07C271/06—Esters of carbamic acids
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- C07C271/10—Esters of carbamic acids having oxygen atoms of carbamate groups bound to acyclic carbon atoms with the nitrogen atoms of the carbamate groups bound to hydrogen atoms or to acyclic carbon atoms
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Definitions
- the present invention provides a novel derivative of chiral 4-boronophenylalanine (BPA; 4-Boronophenylalanine), a method for producing the same, and 18 F-labeled BPA ( 18 F-2-fluoro-4-borono
- BPA 4-boronophenylalanine
- 18 F-labeled BPA 18 F-2-fluoro-4-borono
- the present invention relates to a method for producing -L-phenylalanine; 18 F-BPA, 18 F-2-Fluoro-4-Borono-L-phenylalanine).
- PET Positron Emission Tomography
- CT computed tomography
- MRI magnetic resonance imaging
- 18 F-labeled BPA in which 18 F-fluorine atoms are introduced into BPA, a boronated amino acid used as a boron drug for BNCT (boron neutron capture therapy), was developed as a molecular probe of PET by Ishiwata in 1991 (Non-Patent Document 1). Since then, 18 F-labeled BPA performed using this probe PET inspection is one of the important technologies to support BNCT. That is, 18 F-BPA / PET images measured in advance in subjects in clinical and research fields, information such as distribution distribution of BPA, tumor tissue / normal tissue ratio (T / N ratio), etc. Based on this information, it is possible to predict the therapeutic effects of BNCT in advance and to formulate research or treatment plans.
- BPA is directly fluorinated to obtain 18 F-labeled BPA, and 18 F plus is used as an electrophile.
- An 18 F gas is prepared from cyclotron-accelerated deuterium (D) and neon (Ne) and converted to CH 3 COO -18 F + by passing it through a column packed with sodium acetate, which is then converted to CH 3 COO -18 F + Bubbling is introduced into a trifluoroacetic acid solution of BPA to achieve the desired 18 F-labeled BPA synthesis.
- Non-Patent Document 2 which partially improves the conventional method, has also been proposed as a synthesis method of H 18 F is obtained by using a large amount of H 18 F via CH 3 18 F as an intermediate of 18 F 2 H irradiated with protons to H 2 18 O [ 18 O (p, n) 18 F reaction] H
- CH 3 18 F is once synthesized, and the obtained CH 3 18 F is discharged to disassociate the CF bond into 18 F 2 , which is used in Ishiwata et al.
- it is a method of synthesizing 18 F-labeled BPA.
- the present invention relates to 18 F-labeled BPA It is an object of the present invention to provide new BPA derivatives which can be intermediates for the synthesis of
- Another object of the present invention is to provide a method for producing such a novel BPA derivative and a method for producing 18 F-labeled BPA using it.
- R is BR 3 R 4 , BX 3 ⁇ , or BX 3 ⁇ M + (where X is a halogen, and M + is a monovalent monoatomic cation, polyatomic cation, or complex cation)
- R 1 represents hydrogen or a protecting group PG 1
- R 2 represents hydrogen or a protecting group PG 2
- R 3 and R 4 each represent OH, or R 3 and R 4 together with B form a ring as a protecting group
- Y is halogen, NO 2 , NH 2 , Sn (R 6 ) 3 , NNN—NR 7 R 8 , OSO 2 R 9 , N R 10 R 11 or a substituted or unsubstituted phenyl iodo or a substituted or unsubstituted heterocyclic group iodine (wherein R 6 represents an alkyl group having 1 to 7 carbon atoms; R 7 and R 8 are the
- R is, BR 3 R 4, BX 3 -, or BX 3 M (wherein X represents F, M + is an alkali metal ion, ammonium ion, tetraalkylammonium ion, tetra aryl ammonium ion, tetraalkyl phosphonium ion, tetra aryl phosphonium ion or represents an imidazolium ion) indicates, R 3 and R 4 are each, or represents OH, ring as protective groups taken together with B Form
- the compound of the present invention may be any of the following compounds.
- the present invention is also (Where X 1 and X 2 represent the same or different halogens) Including the process of using The compound represented by the following formula:
- R is BR 3 R 4 , BX 3 ⁇ , or BX 3 ⁇ M + (where X is a halogen, and M + is a monovalent monoatomic cation, polyatomic cation, or complex cation)
- R 1 represents hydrogen or a protecting group PG 1
- R 2 represents hydrogen or a protecting group PG 2
- R 3 and R 4 each represent OH, or both Together with Y forms a ring as a protecting group
- Y is halogen, NO 2 , NH 2 , Sn (R 6 ) 3 , NNN—NR 7 R 8 , OSO 2 R 9 , N R 10 R 11 Or substituted or unsubstituted phenyl iodo or substituted or unsubstituted heterocyclic group iodine (wherein, R 6 represents an alky
- the above-mentioned production method is a compound represented by the following formula (Where X 1 and X 2 represent the same or different halogen), N-diphenylmethylene glycine methyl ester, N-diphenyl methylene glycine ethyl ester, N-diphenyl methylene glycine and N-diphenyl methylene glycine t-butyl ester, N-diphenyl methylene glycine benzyl ester in the presence of a basic catalyst It is preferable to include the step of reacting one more selected reagent.
- R is BR 3 R 4 , BX 3 ⁇ , or BX 3 ⁇ M + (where X is a halogen, and M + is a monovalent monoatomic cation, polyatomic cation, or complex cation)
- R 1 represents hydrogen or a protecting group PG 1
- R 2 represents hydrogen or a protecting group PG 2
- R 3 and R 4 each represent OH, or both Together with Y forms a ring as a protecting group
- Y is halogen, NO 2 , NH 2 , Sn (R 6 ) 3 , NNN—NR 7 R 8 , OSO 2 R 9 , N R 10 R 11 Or substituted or unsubstituted phenyl iodo or substituted or unsubstituted heterocyclic group iodine (wherein, R 6 represents an alkyl group having 1 to 7 carbon atoms; R 7 and R 8 represent The same or different, hydrogen, an alkyl
- the present invention also provides a compound represented by the following formula: (Here, X 1 represents a halogen, R 1 represents hydrogen or a protecting group PG 1 , R 12 represents NH 2 , NH PG 2 (PG 2 is a protecting group), or aminomethylene diphenyl) About.
- novel BPA derivatives according to the invention can in particular be used advantageously in the preparation of 18 F-labelled BPA.
- 18 F-labeled BPA The existing method of synthesizing is a method of directly fluorinating BPA, and in particular, is achieved by conducting an electrophilic reaction using 18 F as an electrophile.
- the inventors of the present invention have problems in preparation processes of the 18 F 2 gas in the cyclotron and processes of using the obtained 18 F 2 gas to F plus in such an existing synthesis route, and further, mixing 18 F-labeled BPA finally obtained from the generation of reaction products by the 19 F 2 molecules Specific activity is reduced, 18 F-labeled BPA can be used for PET diagnosis in one synthesis We focused on the fact that the amount is about several persons.
- the novel 18 F-labeled BPA synthesis method of the present invention is completely different from the conventional methods, and is a synthesis method that can utilize 18 F anions, and the load on the device is low, and the yield is higher than the previous synthesis methods. It allows the synthesis of quantities of 18 F labeled BPA.
- novel BPA derivatives are obtained.
- This novel BPA derivative is conveniently 18 F-labeled by a nucleophilic substitution reaction in a convenient and high yield, whereby 18 F-labeled BPA can be easily and efficiently obtained.
- the BPA derivative is the same as the pinacol boron derivative represented by the following formula.
- R is BR 3 R 4 , BX 3 ⁇ , or BX 3 ⁇ M + (where X is a halogen, and M + is a monovalent monoatomic cation, polyatomic cation, or complex cation)
- R 1 represents hydrogen or a protecting group PG 1
- R 2 represents hydrogen or a protecting group PG 2
- R 3 and R 4 each represent OH, or both Together with Y forms a ring as a protecting group
- Y is halogen, NO 2 , NH 2 , Sn (R 6 ) 3 , NNN—NR 7 R 8 , OSO 2 R 9 , N R 10 R 11 , or a substituted or unsubstituted phenyl iodine, represents either a substituted or unsubstituted heterocyclic group iodine (wherein, R 6 represents an alkyl group having 1 to 7 carbon
- X represents a halogen, and in particular, F is preferred.
- M + represents a monovalent monoatomic cation, polyatomic cation or complex cation.
- alkali metal ions such as K + , Na + , Li + etc., ammonium ions, tetraalkylammonium ions, tetraarylammonium ions, tetraalkylphosphonium ions, tetraarylphosphonium ions, or imidazolium It is preferably an ion.
- alkyl is not limited, but is preferably C1-6 alkyl.
- tetraalkylammonium ion examples include tetramethylammonium ion, tetraethylammonium ion, tetrabutylammonium ion, tetrapropylammonium ion and the like. It is preferable that "aryl” here is a substituted or unsubstituted phenyl group.
- ring structure having 3 to 7 members together with N refers to a ring having saturated or unsaturated carbon and nitrogen.
- R 6 represents methyl or n-butyl;
- R 7 and R 8 are identical or different and hydrogen, methyl, ethyl, propyl, butyl, heptyl, trifluoromethyl or optionally substituted phenyl Represent a group or together with N to form an aziridine, azetidine, pyrrolidine, piperidine, homopiperidine;
- R 9 represents methyl, ethyl, propyl, butyl, heptyl, trifluoromethyl or an optionally substituted phenyl group;
- R 10 And R 11 are the same or different and represent methyl, ethyl, propyl, butyl, h
- the heterocyclic group is particularly preferably thienyl group, furanyl group, pyridinyl group, piperidinyl group, piperazinyl group and the like.
- R 14 preferably represents a halogen, a tetrafluborate group, a ditorate group, a triflate group, a sulfonyloxy group, a toluene sulfonyloxy group, or a perchlorate group.
- R represents BR 3 R 4 , BX 3 ⁇ , or BX 3 ⁇ M + (where X represents F and M + represents an alkali metal ion or ammonium ion).
- R 3 and R 4 each represent OH or together with B form a ring as a protecting group.
- R 1 represents hydrogen or a protecting group PG 1 of a carboxylic acid, wherein PG 1 is not particularly limited and represents all carboxylic acid protecting groups known to those skilled in the art. For example, protecting groups described in Green Watts, "Protective groups in organic synthesis” (Wiley-Interscience, USA) can be mentioned. Typically, it can be protected in ester form using ester condensation conditions and alkylation conditions. Examples of PG 1 include aromatic groups such as an alkyl group having 1 to 7 carbon atoms and a benzyl group.
- alkyl groups such as methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, sec-butyl, tert-butyl, n-pentyl, etc., benzyl, Aromatic groups such as p-methoxybenzyl group and p-nitrobenzyl group can be mentioned. Particularly preferred is a tert-butyl group or a benzyl group which is less susceptible to racemization during deprotection.
- R 2 represents hydrogen or a protecting group PG 2 of an amino group.
- Protecting groups for amino acids include all protecting groups known to the person skilled in the art. For example, protecting groups described in Green Watts, "Protective groups in organic synthesis” (Wiley-Interscience, USA) can be mentioned.
- a benzyloxycarbonyl group an acetyl group, a trifluoroethylcarboxy group, a tert-butyloxycarbonyl group, a fluorenylmethyloxycarbonyl group, a trichloroethoxycarbonyl group, a trifluoroacetyl group, an allyloxycarbonyl group, a benzyl group And propargyloxycarbonyl group, benzoyl group, phthaloyl group, toluenesulfonyl group, nitrobenzenesulfonyl group and the like, but not limited thereto. Among them, benzyloxycarbonyl group and tert-butyloxycarbonyl group which can be deprotected in a short time are preferable.
- the ring structure here also includes a spiro ring and a fused ring.
- Groups capable of forming a ring include pinacol, 2,2-dimethyl-1,3-propanediol, N-methyldiethanolamine, 1,8-diaminonaphthalene, N-methyliminodiacetic acid, 1,1,1-trishydroxy Examples include, but are not limited to, methyl ethane and catechol.
- a group represented by OR 5 -O (-R 5- represents an alkylene having 2 to 7 carbon atoms which may be substituted) is preferable, and among these, pinacol is preferable.
- the optionally substituted alkylene means a C 1-6 alkyl group or a C 1-6 alkoxy group-substituted alkylene.
- the alkyl group having 1 to 7 carbon atoms is, in particular, methyl group, ethyl group, n-propyl group, iso-propyl group, n-butyl group, iso-butyl group, sec-butyl group, tert. -Butyl group and n-pentyl group are preferable.
- the halogen-substituted alkyl group refers to an alkyl group having 1 to 7 carbon atoms in which any number of hydrogen atoms are substituted by halogen. Preferably, it is a trifluoromethyl group, but is not limited.
- the substituted phenyl group refers to a phenyl group or a phenyl group having a substituent at each of 1 to 3 positions of the phenyl group independently.
- the substituted 3- to 10-membered ring refers to a 3- to 10-membered ring or a 3- to 10-membered ring having a substituent at 1 to 3 positions of a 3- to 10-membered ring or a 3- to 10-membered ring each independently.
- the substituted heterocyclic group has a heterocyclic ring or a heterocyclic group having a substituent at each of 1 to 3 positions of the heterocyclic ring independently.
- the substituent of such phenyl group, 3- to 10-membered ring or heterocyclic ring is not limited, but is, for example, a C 1-6 alkyl group, a C 1-6 alkoxyl group, a hydroxyl group, an amino group or a nitro group Is included.
- the BPA derivative of the present invention can be synthesized, for example, by the following step A, step B or step C.
- the protective group used in the following reaction formula can be appropriately changed, and is not limited to this example.
- the reaction temperature differs depending on the solvent, the starting material, the reagent and the like, and is appropriately selected.
- the reaction time varies depending on the solvent, starting materials, reagents, reaction temperature and the like, and is appropriately selected.
- the target compound of each step can be isolated from the reaction mixture according to a conventional method.
- the target compound is, for example, (i) optionally filtering off insoluble matters such as a catalyst, and (ii) adding water and a solvent immiscible with water (eg, ethyl acetate, chloroform etc.) to the reaction mixture
- a solvent immiscible with water eg, ethyl acetate, chloroform etc.
- the desired compound is extracted, (iii) the organic layer is washed with water, optionally dried using a desiccant such as anhydrous magnesium sulfate, and (iv) obtained by distilling off the solvent.
- the desired compound thus obtained can be further purified, if necessary, by a known method (eg, silica gel column chromatography etc.).
- the target compound of each step can be provided to the next reaction without purification.
- R 100 is an alkyl group such as methyl, ethyl, propyl, butyl, heptyl, trifluoromethyl and the like, a halogen-substituted alkyl group, hydrogen and optionally substituted R 101 represents a C 1-6 alkyl group, a C 1-6 alkoxyl group, a hydroxyl group, an amino group or a nitro group, or a protecting group of phenolic OH such as substituted phenyl group or substituted silyl group .
- Step A-1 is a step of reacting compound (2) with a halogenating reagent in the presence of a catalyst to produce compound (3).
- the compound (2) is known and commercially available, but can also be obtained by synthesis from commercially available compounds.
- X 1 and X 2 independently represent halogen. Particularly preferably, it represents iodine or bromine. Among them, X is preferably bromine from the viewpoint of availability.
- the halogenating reagent to be used includes N-bromosuccinimide, dibromoisocyanuric acid, 1,3-diiodo-5,5'-dimethylhydantoin, N-iodosuccinimide and the like.
- the catalyst used is a radical polymerization agent such as peroxide or AIBN.
- the solvent to be used is not particularly limited, benzene, chloroform, carbon tetrachloride can be mentioned, and particularly preferably carbon tetrachloride can be mentioned.
- the reaction temperature is preferably room temperature to 120 ° C., more preferably 70 to 100 ° C.
- the reaction time is preferably 1 hour to 24 hours, more preferably 6 hours to 18 hours.
- Step A-2 is a step of reacting the compound (3) with a phase transfer catalyst generally used for the Maruoka reaction and a modified amino acid in the presence of a base to produce a compound (4).
- the modified amino acid in the Maruoka reaction to be used is not limited, but preferably, N-diphenylmethylene glycine methyl ester, N-diphenyl methylene glycine ethyl ester, N-diphenyl methylene glycine N-diphenyl methylene glycine t-butyl ester, Examples thereof include 4-chlorobenzylideneglycine t-butyl ester and N-diphenylmethyleneglycine benzyl ester ester. Among them, N-diphenylmethylene glycine t-butyl ester is particularly preferable.
- the base to be used is not limited, lithium hydroxide, sodium hydroxide, potassium hydroxide, further triethylamine and the like are preferably used. From the reaction rate, potassium hydroxide is particularly preferred.
- Preferred examples of the modified amino acid in the Maruoka reaction to be used include O-allyl-N- (9-anthracenylmethyl) cinchonidinium bromide, (S)-(+)-4,4-dibutyl l-2 And 6,6-bis (3,4,5-trifluorophenyl) -4,5-dihydro-3H-dinaphtho [7,6,1,2-cde] azemipium bromide and the like.
- the solvent used is preferably toluene, dichloromethane, chloroform and the like. Particularly preferred is toluene from the environmental point of view.
- the reaction temperature is preferably ⁇ 20 ° C. to 100 ° C., more preferably ⁇ 4 ° C. to room temperature.
- the reaction time is preferably 30 minutes to 24 hours, more preferably 1 to 18 hours.
- the obtained compound may be purified, but can also proceed to the next step without purification.
- the step A-3 is a step of desorbing the amino group protected form of the compound (4) in an acidic aqueous solution.
- the solvent to be used include citric acid or a mixed solvent of oxalic acid water and acetone, acetonitrile, THF, DMF, or DMSO, and more preferable examples include citric acid or oxalic acid from the viewpoint of evaporation of the solvent. It is a mixed solvent of acid water and acetone, acetonitrile or THF.
- the reaction temperature is preferably room temperature to 100 ° C., and more preferably room temperature to 80 ° C.
- the reaction time is preferably 30 minutes to 24 hours, more preferably 1 to 3 hours.
- Step A-4 is a step of protecting the amino group of the compound (5) under basic conditions using a protecting reagent.
- protecting reagents used include, but are not limited to, benzyl chloroformate, di-t-butyl dicarbonate and the like.
- the base to be used is preferably lithium hydroxide, sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, triethylamine, etc., but not limited thereto. In particular, mild sodium carbonate and potassium carbonate are preferred.
- the solvent used is preferably an amphiphilic solvent.
- acetone, acetonitrile, THF, DMF, DMSO can be mentioned, and preferably acetone, acetonitrile, THF from the viewpoint of solvent evaporation.
- the reaction temperature is preferably ⁇ 20 ° C. to 100 ° C., more preferably ⁇ 4 ° C. to room temperature.
- the reaction time is preferably 30 minutes to 24 hours, more preferably 3 hours to 18 hours.
- Process A-5 is a process for producing a pinacol boric acid derivative using a pinacol borate reagent in the presence of a palladium catalyst and a ligand for compound (6).
- the catalyst used includes, but is not limited to, palladium catalysts generally used in Suzuki-Miyaura coupling reaction, such as palladium cinnamyl complex, palladium acetate, trisdibenzylideneacetone dipalladium, etc. Absent.
- phosphorus-based ligands generally used in Suzuki-Miyaura coupling reaction, such as tricyclohexylphosphine, 2-dicyclohexylphosphino-2,4,6-triiso-propylbiphenyl, 2- Dicyclohexylphosphino-2,-(N, N) -dimethylaminobiphenyl, 3,5-dimethoxy-2-dicyclohexylphosphino-2,4,6-triisopropylbiphenyl, 3,5-dimethoxy-2-ditert -Butylphosphino-2,4,6-triisopropylbiphenyl etc. but not limited thereto.
- lithium hydroxide sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, triethylamine and the like are used, but it is not limited. Particularly preferred are mild sodium carbonate and potassium carbonate.
- the solvent used is preferably toluene, dioxane or the like.
- the reaction temperature is preferably room temperature to 150 ° C., more preferably 80 ° C. to 120.
- the reaction time is preferably 1 hour to 24 hours, more preferably 2 hours to 18 hours.
- Process A-6 is a process for producing aniline derivative (8) by hydrogenating and reducing compound (7).
- a catalyst to be used palladium hydroxide, palladium carbon and the like are used, but it is not limited thereto.
- the solvent to be used includes acetone, acetonitrile, THF, methanol, ethanol and the like, preferably methanol and ethanol inert to the reduction reaction are preferable.
- the reaction temperature is preferably ⁇ 20 ° C. to 100 ° C., more preferably room temperature to 50 ° C.
- the reaction time is preferably 30 minutes to 24 hours, more preferably 3 to 18 hours.
- Process A-7 is a process for producing a halogen derivative (9) by passing the compound (8) through diazonium.
- diazonium reaction reagent sodium nitrite, potassium nitrite, and further, alkyl nitrite such as isobutyl nitrite and the like are used.
- alkyl nitrite such as isobutyl nitrite and the like
- iodinating reagent known sodium iodide, potassium iodide, iodine and the like can be mentioned.
- the solvent to be used may be water, acetone, acetonitrile, THF, methanol, ethanol or the like, or a mixed solvent of two or more of them. Among them, acetone inert to the diazotization reaction is preferable.
- the reaction temperature is preferably ⁇ 20 ° C. to room temperature, more preferably ⁇ 10 ° C. to 5 ° C.
- the reaction time is preferably 30 minutes to 2 hours, more preferably 30 minutes to 1 hour.
- the step A-8 is a step of producing a trialkyltin compound (10) by a Suzuki-Miyaura coupling reaction of the compound (9).
- reaction reagents include tributyltin and trimethyltin.
- a palladium catalyst generally used in Suzuki-Miyaura coupling reaction such as palladium cinnamyl complex, palladium acetate, trisdibenzylideneacetone dipalladium, tetrakistriphenylphenyl phosphinopalladium etc. These include, but are not limited to. Among them, preferred is tetrakistriphenylphenyl phosphino palladium.
- lithium hydroxide, sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium acetate, potassium acetate and triethylamine are used, but more mild sodium acetate and potassium acetate are preferable. .
- the solvent used is preferably toluene, dioxane or the like.
- the reaction temperature is preferably room temperature to 150 ° C., more preferably 80 ° C. to 120 ° C.
- the reaction time is preferably 1 hour to 48 hours, more preferably 2 hours to 24 hours.
- Step A-9 is a step of producing triazene derivative (11) by passing compound (8) through diazonium.
- diazonium reaction reagent sodium nitrite, potassium nitrite, and further, alkyl nitrite such as isobutyl nitrite and the like are used. Further, as a reaction reagent, known dimethylamine, cyclopentylamine, cyclohexylamine and the like can be mentioned.
- the solvent to be used may be water, acetone, acetonitrile, THF, methanol, ethanol or the like, or a mixed solvent of two or more of them. Among them, acetone inert to the diazotization reaction is preferable.
- the reaction temperature is preferably ⁇ 20 ° C. to room temperature, more preferably ⁇ 10 ° C. to 5 ° C.
- the reaction time is preferably 30 minutes to 2 hours, more preferably 30 minutes to 1 hour.
- the X-9 step of converting the compound (10) into the compound (101) is exemplified by, but not limited to, the following.
- Compound (10) is dissolved in a solvent, and iodonium such as Koser's reagent is added under nitrogen stream.
- Examples of the solvent used include water, dichloromethane, acetone, acetonitrile, THF, methanol, ethanol, trifluoroethanol and the like, or a mixed solvent of two or more of them, among which dichloromethane is preferable.
- the reaction temperature is preferably ⁇ 20 ° C. to room temperature, more preferably ⁇ 10 ° C. to 5 ° C.
- the reaction time is preferably 30 minutes to 2 hours.
- the reagent used in the step X-12 for converting the compound (101) to the compound (102) includes hydrogen halides and hydrogen halides such as hydrogen chloride.
- the solvent to be used may be water, dichloromethane, acetone, acetonitrile, THF, methanol, ethanol or the like, or a mixed solvent of two or more of them. Among them, a combination of water and dichloromethane is preferable.
- the reaction temperature is preferably 0 ° C. to 60 ° C., more preferably room temperature (20 to 30 ° C.).
- the reaction time is preferably 30 minutes to 24 hours, more preferably 1 hour to 12 hours.
- the reagent used in the X-13 step of converting the compound (102) to the compound (103) includes hydrogen fluoride.
- Examples of the solvent used include water, dichloromethane, acetone, acetonitrile, THF, methanol, ethanol, DMF, DMSO and the like, or a mixed solvent of two or more of them, among which dichloromethane alone or acetonitrile, DMF, A combination of DMSO is preferred.
- the reaction temperature is preferably ⁇ 20 ° C. to 180 ° C., more preferably 80 ° C. to 160 ° C.
- the reaction time is preferably 5 minutes to 2 hours, more preferably 10 minutes to 1 hour.
- the reagent includes alkali fluoride.
- Examples of the solvent used include water, dichloromethane, acetone, acetonitrile, THF, methanol, ethanol and the like, or a mixed solvent of two or more of them, among which dichloromethane alone or a combination of water and dichloromethane is preferable. is there.
- the reaction temperature is preferably ⁇ 20 ° C. to room temperature, more preferably ⁇ 10 ° C. to 5 ° C.
- the reaction time is preferably 30 minutes to 2 hours, more preferably 30 minutes to 1 hour.
- Examples of the reagent include alkali halides.
- Examples of the solvent used include water, dichloromethane, acetone, acetonitrile, THF, methanol, ethanol and the like, or a mixed solvent of two or more of them, among which dichloromethane alone or a combination of water and dichloromethane is preferable. It is.
- the reaction temperature is preferably 0 ° C. to 60 ° C., more preferably room temperature (20 ° C. to 30 ° C.).
- the reaction time is preferably 30 minutes to 2 hours, more preferably 30 minutes to 1 hour.
- Step B-1 is a step of producing a halogen derivative (13) by passing a known compound (12) through diazonium.
- sodium nitrite, potassium nitrite, and further, alkyl nitrite such as isobutyl nitrite and the like are used as the diazonium reaction reagent.
- X 3 represents halogen, in particular iodine, bromine or chlorine.
- the halogenation reagent include Sandmeyer reagent, known sodium iodide, potassium iodide, iodine and the like. Among them, copper bromide which is a stable Sandmeyer reagent is a suitable example.
- the solvent to be used includes water, acetone, acetonitrile, THF, methanol, ethanol, etc., or a mixed solvent of two or more of them. Among them, acetone inert to the diazotization reaction is preferred. is there.
- the reaction temperature is preferably ⁇ 20 ° C. to room temperature, more preferably ⁇ 10 ° C. to 5 ° C.
- the reaction time is preferably 30 minutes to 2 hours, more preferably 30 minutes to 1 hour.
- Process B-2 is a process for producing a compound (14) obtained by protecting the hydroxy group of the compound (13).
- a protecting group methyl group, benzyl group, methoxybenzyl group, tert-butyl group, methoxymethyl group, 2-tetrahydropyranyl group, ethoxyethyl group, ethoxy group, acetyl group, pivaloyl group, benzoyl group, trimethylsilyl group, triethylsilyl group There may be used, but not limited to, tert-butyldimethylsilyl group, triisopropylsilyl group, tert-butyldiphenylsilyl group and the like.
- the solvent to be used a mixed solvent of water and acetone, acetonitrile, THF, methanol, ethanol and the like can be mentioned, and among them, acetone inert to the diazotization reaction is preferable.
- the reaction temperature is preferably ⁇ 20 ° C. to room temperature, more preferably ⁇ 10 ° C. to 5 ° C.
- the reaction time is preferably 30 minutes to 2 hours, more preferably 30 minutes to 1 hour.
- Step B-3 is a step of producing a compound (15) obtained by appropriately halogenating the benzylic position of the compound (14).
- the reaction reagents, conditions and the like are the same as in the above-mentioned (Step A-1).
- Step B-4 is a step of producing an amino acid derivative (16) obtained by subjecting compound (15) to Maruoka reaction.
- the reaction reagents, conditions and the like are the same as in the above-mentioned (Step A-2).
- Process B-5 is a process for producing an amine derivative (17) obtained by dediphenylmethylation of compound (16).
- the reaction reagents, conditions and the like are the same as in (A-3 step).
- Process B-6 is a process for producing an amine derivative (18) obtained by introducing a protective group into compound (17).
- the reaction reagents, conditions and the like are the same as in (A-4 step).
- Process B-7 is a process for producing a pinacol boric acid derivative (19) obtained by introducing pinacol boron into compound (18).
- the reaction reagents, conditions, etc. are the same as in (A-5 step).
- Process B-8 is a process for producing a phenol derivative (20) by removing the hydroxyl-protecting group of compound (19).
- Deprotection reagents include aqueous solutions of citric acid, oxalic acid, trifluoroacetic acid, hydrochloric acid, hydrobromic acid in methanol, ethanol, dioxane, ethyl acetate and the like, and aqueous solutions, sulfuric acid, methanesulfonic acid, trifluoro And acidic components such as lomethanesulfonic acid or fluoride ions.
- the solvent to be used may be water, acetone, acetonitrile, THF, methanol, ethanol or the like, or a mixed solvent of two or more of them. Among them, acetone inert to the diazotization reaction is preferable.
- the reaction temperature is preferably ⁇ 20 ° C. to room temperature, more preferably ⁇ 10 ° C. to 5 ° C.
- the reaction time is preferably 30 minutes to 2 hours, more preferably 30 minutes to 1 hour.
- the obtained compound can be easily purified by silica gel column chromatography.
- Step B-9 is a step of producing an alkyl or allylsulfonyloxy derivative (21) of a phenol derivative (20).
- reaction reagent examples include methylsulfonyl chloride, trifluoromethanesulfonyl chloride and p-toluenesulfonyl chloride.
- the solvent to be used includes dioxane, ether solvents such as THF, dichloromethane and the like.
- the reaction temperature is preferably ⁇ 20 ° C. to 100 ° C., more preferably ⁇ 10 ° C. to room temperature.
- the reaction time is preferably 30 minutes to 2 hours, more preferably 30 minutes to 1 hour.
- the obtained compound can be easily purified by silica gel column chromatography.
- Step C-1 is a production step in which the fluorine of the known compound (22) is reacted with a secondary amine to form a tertiary amine derivative.
- the reaction reagent includes, but is not limited to, dimethylamine, diethylamine, aziridine, azetidine, pyrrolidine, piperidine and the like.
- the solvent to be used includes dioxane, ether solvents such as THF, dichloromethane and the like.
- the reaction temperature is preferably room temperature to 100 ° C., more preferably room temperature to 80 ° C.
- the reaction time is preferably 30 minutes to 24 hours, more preferably 1 hour to 6 hours.
- Step C-2 is a step of reacting compound (23) with Wittig's reagent to produce olefin (24).
- reaction reagent [2- (1,3-dioxolan-2-yl) ethyl] triphenylphosphonium bromide, (1,3-dioxolan-2-yl-methyl) triphenylphosphonium bromide, (methoxy Alkyl phosphonoacetic acid alkyl esters such as methyl) triphenyl phosphonium chloride, (bromomethyl) triphenyl phosphonium bromide, isoamyl triphenyl phosphonium bromide, dimethyl phosphonoacetic acid methyl ester, dimethyl phosphonoacetic acid ethyl ester, or And dialkyl phosphonoacetic acid benzyl ester or substituted benzyl ester.
- the solvent to be used includes dioxane, ether solvents such as THF, dichloromethane and the like.
- the reaction temperature is preferably ⁇ 78 ° C. to 100 ° C., more preferably ⁇ 20 ° C. to 100 ° C.
- the reaction time is preferably 30 minutes to 24 hours, more preferably 1 hour to 6 hours.
- Process C-3 is a process for producing a pinacol boric acid derivative (26) obtained by introducing pinacol boron into a compound (24).
- reaction reagents, conditions and the like are the same as in the above-mentioned (Step A-5).
- Step C-4 is a step of producing a pinacol boric acid derivative (25) obtained by introducing pinacol boron into a compound (23).
- the reaction reagents, conditions and the like are the same as in the above-mentioned (Step A-5).
- Step C-5 is a step of reacting the compound (25) with a Wittig reagent to produce an olefin (26).
- the reaction reagents, conditions and the like are the same as in the above-mentioned (Step C-2).
- Step C-6 is a process of producing compound (27) by subjecting compound (26) to reductive hydrogenation.
- the reaction reagents, conditions and the like are the same as in the above-mentioned (Step C-2).
- the reaction catalyst may, for example, be a palladium catalyst such as palladium hydroxide or palladium-carbon, or a ruthenium complex.
- solvent to be used examples include ether solvents such as dioxane and THF, and alcohol solvents such as methyl alcohol.
- the reaction temperature is preferably ⁇ 20 ° C. to 100 ° C., more preferably room temperature to 80 ° C.
- the reaction time is preferably 30 minutes to 120 hours, more preferably 1 hour to 24 hours.
- accelerated protons are irradiated to H 2 18 O to synthesize H 18 F-hydrofluoric acid by 18 O (p, n) reaction, which is passed through an ion exchange resin column and adsorbed, It separates from H 2 18 O which is a non-adsorbed raw material.
- K + 18 F The column was eluted with aqueous K 2 CO 3 - give, which can be used in the nucleophile
- the labeled compound is obtained by heating the obtained 18 F anion as a nucleophile in an organic solvent together with a phase transfer catalyst.
- the target compound can be obtained by a known method.
- Y is NH 2
- labeling is achieved by reaction with H 18 F via a diazonium salt.
- Y can be obtained by I or OSO 2 R 9 also by a known method, but can be obtained in a short time by the method of Donald et al. (Non-patent literature Science, 325, 1661, 2009.). That is, by reacting the nucleophile 18 F ⁇ in the presence of a palladium catalyst and a ligand such as 2-dicyclohexylphosphino-2,4,6-triiso-propylbiphenyl, a labeled form is obtained in a short time (see Reference Example 1).
- a ligand such as 2-dicyclohexylphosphino-2,4,6-triiso-propylbiphenyl
- Y: Sn (R 6 ) 3 is obtained by the method of Ermert et al. (Non-patent literature J. Label. Compd. Radiopharm., 47, 429, 2004.). That, is reacted with hydroxyl (tosyloxy) Iodoarene such Koser's reagent, once created diallyl iodide salt, to, the nucleophile 18 F - by reacting the efficiency on preferred label is obtained (Reference Example 2)
- reaction solvent includes, but is not limited to, chloroform, benzene, toluene, xylene, acetonitrile, tetrahydrofuran, dimethylsulfoxide, dimethylformamide, ethyl acetate, acetone and the like.
- Phase transfer catalysts include, but are not limited to, crown ethers, cryptofixes, salts with long chain alkyl ammonium cations such as tetrabutyl ammonium salts, trioctyl methyl ammonium salts, benzyl dimethyl octadecyl ammonium salts, etc. .
- a base as a trap agent, potassium carbonate, cesium carbonate, sodium carbonate, rubidium carbonate and the like can be mentioned, but it is not limited thereto.
- the reaction temperature may be from room temperature to the boiling point of the solvent, preferably 60 ° C. to 180 ° C., more preferably 90 ° C. to 160 ° C., but there is a preferable temperature than the substituent, and the range is limited is not.
- the 18 F-labeled BPA thus obtained refers to the following compounds.
- Example 5 (S)-(2- (3-tert-butoxy-2- (tert-butoxycarbonylamino) -3-oxopropyl) -5- (4,4,5,5-tetramethyl-1,3,2- Preparation of dioxaborane-2-yl) phenyl) (3-methoxyphenyl) iodonium tosylate To 168 mg (0.228 mmol) of the compound obtained in Example 4 is added trifluoroethanol (2 mL), and the mixture is stirred in an ice-water bath under a nitrogen stream for 1 Stir for hours.
- Example 7 (S)-(2- (3-tert-butoxy-2- (tert-butoxycarbonylamino) -3-oxopropyl) -5- (potassium trifluoro-2-yl) phenyl) (3-methoxyphenyl)
- iodonium tosylate Compound 107 (79 mg, 0.093 mmol) was dissolved in MeCN (1 mL), an aqueous solution (100 ⁇ L) of KF (22 mg, 0.372 mmol) was added to the solution and stirred. Next, L-tartaric acid (28 mg, 0.186 mmol) is dissolved in THF (0.5 mL) and added dropwise to the reaction solution.
- Example 9 Using the compound of Example 1 and the compound of Example 3, a confirmation test as to whether or not fluorine substitution is actually performed is carried out.
- Reference Example 1 Fluorine labeling reaction using a fluorine substitution reaction of an iodo compound
- the compound (0.10 mmol) obtained in Example 1 is dissolved in toluene, and under a nitrogen stream, palladium chloride cinnamyl complex (5.0 mol%), further 2-dicyclohexyl After phosphino-2,4,6-triiso-propylbiphenyl (6.0 mol%) is added, a fluorination reagent is added, and reaction is performed at 100 ° C. for 1 hour under a nitrogen stream.
- the HPLC analysis of the obtained fluorine labeled compound is performed.
Abstract
Description
tert-ブチル 2-(tert-ブトキシカルボニルアミノ)-3-(2-ニトロ-4-(4,4,5,5-tetraメチル-1,3,2-ジオキサボロラン-2-イル)フェニル)プロパノエート;
tert-ブチル 3-(2-アミノ-4-(4,4,5,5-tetraメチル-1,3,2-ジオキサボロラン-2-イル)フェニル)-2-(tert-ブトキシカルボニルアミノ)プロパノエート;
tert-ブチル 2-(tert-ブチルオキシカルボニルアミノ)-3-(2-ヨード-4-(4,4,5,5-テトラメチル-1,3,2-ジオキサボロラン-2-イル)フェニル) プロパノエート;
tert-ブチル 2-(tert-ブチルオキシカルボニルアミノ)-3-(4-(4,4,5,5-テトラメチル-1,3,2-ジオキサボロラン-2-イル)-2-(トリn-ブチルスタニル)フェニル) プロパノエート;
tert-ブチル 2-(tert-ブトキシカルボニルアミノ)-3-(2-フルオロ-4-(4,4,5,5-テトラメチル-1,3,2-ジオキサボロラン-2-イル)フェニル)プロパノエート;
(2-(3-tert-ブトキシ-2-(tert-ブトキシカルボニルアミノ)-3-オキソプロピル)-5-(4,4,5,5-テトラメチル-1,3,2-ジオキサボラン-2-イル)フェニル)(3-メトキシフェニル)ヨードニウム トシレート;
tert-ブチル 2-(tert-ブチルオキシカルボニルアミノ)-3-(2-ニトロ-4-(ポタッジウムトリフルオロ-2-イル)-2-ニトロフェニル) プロパノエート;
(2-(3-tert-ブトキシ-2-(tert-ブトキシカルボニルアミノ)-3-オキソプロピル)-5-(ポタッジウムトリフルオロ-2-イル)フェニル)(3-メトキシフェニル)ヨードニウム トシレート。
を使用する工程を含む、
下記式で表わされる化合物:
塩基性触媒の存在下において、N-ジフェニルメチレングリシンメチルエステル、N-ジフェニルメチレングリシンエチルエステル、N-ジフェニルメチレングリシンおよびN-ジフェニルメチレングリシンt-ブチルエステル、N-ジフェニルメチレングリシンベンジルエステルからなる群より選択される1種の試薬を反応させる工程を含むことが好ましい。
と、
フッ素化試薬とを反応させる工程を含む、18 F標識化BPA の製造方法、に関する。
工程A
すなわち、A-1工程は、化合物(2)を触媒存在下にてハロゲン化試薬と反応させて、化合物(3)を製造する工程である。化合物(2)は公知であり、市販されているが、市販の化合物から合成により得ることもできる。
A-2工程は、化合物(3)を塩基の存在下にて、一般的に丸岡反応に用いられる相間移動触媒および修飾アミノ酸と反応させて、化合物(4)を製造する工程である。
A-3工程は、化合物(4)を酸性水溶液中にて、アミノ基保護体を脱離する工程である。使用される溶媒としては、クエン酸、もしくはシュウ酸水とアセトン、アセトニトリル、THF、DMF、DMSOとの混合溶媒があげられるが、より好ましい例は、溶媒留去の点から、クエン酸、もしくはシュウ酸水とアセトン、アセトニトリルもしくはTHFの混合溶媒である。
A-4工程は、化合物(5)を塩基性条件下、保護化試薬を使用し、アミノ基を保護する工程である。使用される保護化試薬は、ベンジルクロロフォルメート、ジ-t-ブチルジカルボネートなどが挙げられるが限定はされない。
A-5工程は、化合物(6)をパラジウム触媒およびリガンド存在下、ピナコールホウ素化試薬を使用し、ピナコールホウ酸誘導体を製造する工程である。使用される触媒としては、鈴木-宮浦カップリング反応で一般的に使用されるパラジウム触媒、例えば塩化パラジウムシンナミル錯体、酢酸パラジウム、トリスジベンジリデンアセトンジパラジウムなどが挙げられるがこれらに限定するものではない。
A-6工程は、化合物(7)を水素化還元することにより、アニリン誘導体(8)を製造する工程である。使用される触媒としては、水酸化パラジウム、パラジウム炭素等が用いられるが、これに限定するものではない。
A-7工程は、化合物(8)をジアゾニウムを経て、ハロゲン誘導体(9)を製造する工程である。ジアゾニウム反応試薬としては、亜硝酸ナトリウム、亜硝酸カリウム、さらには亜硝酸イソブチルなど亜硝酸アルキル等が用いられる。またヨウ素化試薬としては、公知のヨウ化ナトリウム、ヨウ化カリウム、ヨウ素などがあげられる。
A-8工程は、化合物(9)を鈴木-宮浦カップリング反応にて、トリアルキルスズ化合物(10)を製造する工程である。反応試薬としては、トリブチルスズ、トリメチルスズなどがあげられる。また使用される触媒としては、鈴木-宮浦カップリング反応で一般的に使用されるパラジウム触媒、例えば塩化パラジウムシンナミル錯体、酢酸パラジウム、トリスジベンジリデンアセトンジパラジウム、テトラキストリフェニルフェニルホスフィノパラジウムなどが挙げられるがこれらに限定するものではない。なかでも、好ましくはテトラキストリフェニルフェニルホスフィノパラジウムである。
A-9工程は、化合物(8)をジアゾニウムを経て、トリアゼン誘導体(11)を製造する工程である。
B-1工程は、公知の化合物(12)をジアゾニウムを経て、ハロゲン誘導体(13)を製造する工程である。
B-2工程は、化合物(13)のヒドロキシ基を保護して得られる化合物(14)を製造する工程である。
使用される溶媒は、水とアセトン、アセトニトリル、THF、メタノール、エタノールなどのとの混合溶媒が挙げられるが、なかでも、ジアゾ化反応に不活性なアセトンが好適である。
反応試薬、条件などは、既述の(A-1工程)と同様である。
反応試薬、条件などは、既述の(A-2工程)と同様である。
B-5工程は、化合物(16)を脱ジフェニルメチル化にて得られるアミン誘導体(17)を製造する工程である。反応試薬、条件などは、(A-3工程)と同様である。
B-6工程は、化合物(17)に保護基を導入して得られるアミン誘導体(18)を製造する工程である。反応試薬、条件などは、(A-4工程)と同様である。
B-7工程は、化合物(18)にピナコールホウ素を導入して得られるピナコールホウ酸誘導体(19)を製造する工程である。反応試薬、条件などは、(A-5工程)と同様である。
B-8工程は、化合物(19)の水酸基の保護基を脱離し、フェノール誘導体(20)を製造する工程である。脱保護試薬としては、クエン酸水溶液、シュウ酸水溶液、トリフルオロ酢酸、塩酸、臭化水素酸のメタノール、エタノール、ジオキサン、酢酸エチルなどの有機溶媒溶液ならびに水溶液、さらに、硫酸、メタンスルホン酸、トリフルオロメタンスルホン酸などの酸性成分またはフッ化物イオンなどが挙げられる。
B-9工程は、フェノール誘導体(20)をアルキルもしくはアリルスルフォニルオキシ誘導体(21)を製造する工程である。
すなわち、C-1工程は、公知の化合物(22)のフッ素を2級アミンと反応させ、3級アミン誘導体とする製造工程である。反応試薬としては、ジメチルアミン、ジエチルアミン、アジリジン、アゼチジン、ピロリジン、ピペリジンなどがあげられるが、これらに限定されない。
反応時間は、好適には、30分間~24時間であり、より好適には、1時間~6時間である。
C-2工程は、化合物(23)にウィティッヒ試薬と反応させ、オレフィン(24)を製造する工程である。
C-3工程は、化合物(24)にピナコールホウ素を導入して得られるピナコールホウ酸誘導体(26)を製造する工程である。
C-6工程は、化合物(26)に還元水素化させ、(27)を製造する工程である。反応試薬、条件などは、既述の(C-2工程)と同様である。
なお、下記実施例において、化合物の分析および分離精製には以下の機種や試薬を用いて行った。・NMRスペクトル:(日本電子社製、JNM-AL series AL400 400MHz)
(1)4-ブロモ-1-(ブロモメチル)-2-ニトロベンゼンの製造
2-ニトロ-6-ブロモトルエン (25.0 g, 116 mmol)、N-ブロモスクシンイミド (28.2 g, 162 mmol)および2,2-azobis(2-メチルプロピオニトリル) (1.90 mg, 11.6 mmol)を四塩化炭素(100mL)に加え、還流下18時間反応をさせた。その後、反応液を濾過し、濾液を減圧濃縮させる。そして、シリカゲルカラムクロマトグラフィー(AcOEt/n-Hexane = 1/9)により精製すると、目的物18.5g(54 %)を得た。1H-NMR (CDCl3); 4.78 (s, 2H, CH2), 7.46 (d, J=8.0, 1H, Ar), 7.74 (dd, J =2.0, 8.1, 1H, Ar), 8.18 (d, J =1.7, 1H, Ar).
N-(ジフェニルメチレン)glycinate (10.0 g, 33.9 mmol),およびO-allイル-N-9-anthracenイルメチルcinchonidium bromide (2.05 g, 3.39 mmol, 0.1 equiv)を9.0 M水酸化カリウム溶液(100 mL)とトルエン(100 mL)との2層混合溶液に添加した。0℃に冷却後、上記合成化合物(10.0 g, 33.9 mmol)のトルエン(30 mL)溶液を滴下していった。滴下終了後、そのまま18時間攪拌させた。その後、反応溶液をエーテル(50 mL)にて2回抽出し、さらにこのエーテル溶液を飽和食塩水にて洗浄した後、硫酸マグネシウムにて乾燥させ、減圧濃縮すると、粗目的物(17.6 g)を得た。なお、精製せず次の工程に進ませた。
前工程で得られた化合物(17.6 g, 34.6 mmol)をTHF(176mL)に溶解し、さらにそこに、30 %クエン酸水溶液(88 mL)を加えた。この混合溶液を1時間還流反応させた。反応終了後、エーテル(80mL)にて洗浄後、炭酸カリウムにて中和した。その後、EtOAc(80mL)にて、2回抽出し、硫酸マグネシウムにて乾燥後、減圧濃縮させると、粗目的物(5.44 g)を得た。収率はベンジルブロマイド体からの収率が47.0%であった。なお、精製せず次の工程に進めた。1H-NMR (CDCl3); 1.45 (s, 9H, t-Bu), 3.08 (dd, J=8.8, 13.6, 1H, CH2-α), 3.29 (dd, J=5.6, 13.6, 1H, CH2-β), 3.62 (dd, J=5.6, 8.5, 1H, CH), 7.31 (d, J=8.4, 1H, Ar), 7.66 (dd, J=2.0, 8.4, 1H, Ar), 8.10 (d, J=2.0, 1H, Ar).
前工程にて得られた化合物’(2.72 g, 7.88 mmol)をアセトン(27 mL)に溶解させ、Boc2O(2.06 g, 9.46 mmol)を加えた。その後、炭酸ナトリウム水溶液(1.25 g, 11.8 mmol)を添加し、室温にて18時間反応させた。その後、減圧濃縮により、アセトンを留去させ、残渣にAcOEt(40mL)にて溶解させる。これを飽和食塩水にて洗浄後、硫酸マグネシウムにて乾燥させた後、減圧濃縮させた。その後、シリカゲルカラムにより精製すると(AcOEt/n-hexane : 1/7)、目的物(2.80 g, 80 %)が得られた。1H-NMR (CDCl3); 1.75(s, 12H), 1.44 (s, 9H, t-Bu), 3.08 (dd, J=8.0, 13.2, 1H, CH2-α), 3.29 (dd, J=5.2, 13.5, 1H, CH2-β), 4.54 (m, 1H, CH), 5.15 (d, J=8.0, 1H, NH), 7.29 (d, J=8.4, 1H, Ar), 7.65 (dd, J=1.7, 8.0, 1H, Ar), 8.11 (d, J=1.7, 1H, Ar).
窒素気流下、PdCl2(dba)(246 mg, 0.38 mmol)およびtricyclophosphine(246 mg, 0.88 mmol)をジオキサン(50 ml)にけん濁させ、30分間攪拌させた。その後、bis(pinacolate)diborane(3.84 g, 13.8 mmol)およびKOAc(1.86 g, 18.9 mmol)を添加し、さらに、化合物3(5.60 g, 12.6 mmol)、その後、100℃まで昇温させ、窒素気流下、この温度にて、終夜攪拌させた。その後、シリカゲルカラム(AcOEt/ n-hexane=1/7)により精製すると、目的物(11.0 g, 87 %)が得られた。1H-NMR (CDCl3); 1.43 (s, 21H), 1.45 (s, 9H, t-Bu), 3.18 (dd, J=8.8, 13.6, 1H, CH2-α), 3.52 (dd, J=5.2, 13.6, 1H, CH2-β), 4.55 (m, 1H, CH), 5.15 (d, J=8.0, 1H, NH), 7.40 (d, J=7.6, 1H, Ar), 7.91 (dd, J=1.4, 7.6, 1H, Ar), 8.34 (d, J=1.2, 1H, Ar).
(6) (S)-tert-ブチル3-(2-アミノ-4-(4,4,5,5-tetraメチル-1,3,2-ジオキサボロラン-2-イル)フェニル)-2-(tert-ブトキシカルボニルアミノ)プロパノエートの製造
上記ニトロ化合物(5.5 g, 11.2 mmol)のメタノール溶液 (20 mL) および10% パラジウム炭素 (0.55 g) の混合物を中圧水添用フラスコに入れ、水素加圧下(0.2 MPa),室温で18時間攪拌した。TLCで反応の進行を確認した後、溶媒を減圧留去して無色油状物のアミノ化合物 (3.72 g, 72 %) を得た。なお、精製せず次の工程に進めた。1H-NMR (CDCl3); 1.30-1.43 (m, 30H, pinacol(CH3)4,-Boc,-t-Bu), 2.89 (dd, J=8.0, 14.0, 1H, CH2-α), 3.03 (dd, J=4.4, 14.0, 1H, CH2-β), 4.36 (m, 1H, CH), 5.36 (d, J=7.2, 1H, NH), 6.96 (d, J=7.6, 1H, Ar), 7.09-7.11 (m, 2H, Ar), 8.34 (d, J=1.2, 1H, Ar).
(7)(S)-tert-ブチル 2-(tert-ブチルオキシカルボニルアミノ)-3-(2-ヨード-4-(4,4,5,5-テトラメチル-1,3,2-ジオキサボロラン-2-イル)フェニル) プロパノエートの製造
水(25 mL)に57 % HI(5.0 g)を加え、さらにCuI(I)(480 mg, 2.52 mmol)を加えた。ここに上記アミノ体 (2.50 g, 5.04 mmol) をアセトニトリル(25 mL)に溶解させた溶液を、氷冷下,亜硝酸ナトリウム (365 mg, 5.29 mmol) の水溶液(5 mL)を滴下ロートからゆっくりと滴下した。0℃で30分間攪拌させ、その後室温下でさらに30分間攪拌した。その後、酢酸エチルで3回抽出した。酢酸エチル層を飽和食塩水で1回洗浄,硫酸マグネシウムで乾燥,減圧濃縮した。その後、シリカゲルカラム(AcOEt/ n-hexane=1/9)により精製すると、目的物(1.40 g, 46 %)が得られた。
1H-NMR (CDCl3); 1.33 (s, 12H, pinacol(CH3)4), 1.37 (s, 9H, t-Bu), 1.43 (s, 9H, t-Bu), 2.97 (dd, J=9.2, 14.0, 1H, CH2-α), 3.05 (dd, J=4.8, 13.6, 1H, CH2-β), 4.50 (m, 1H, CH), 5.06 (d J=8.8, 1H, NH), 6.96 (d, J=8.0, 1H, Ar), 7.57 (dd, J=1.6, 8.0, 1H, Ar), 8.16 (d, J=1.6, 1H, Ar).
(8)(S)-tert-ブチル 2-(tert-ブチルオキシカルボニルアミノ)-3-(4-(4,4,5,5-テトラメチル-1,3,2-ジオキサボロラン-2-イル)-2-(トリn-ブチルスタニル)フェニル) プロパノエートの製造
ナス型フラスコに、上記化合物(371mg, 0.705mmol)をアルゴン雰囲気下でトルエン(30mL)に溶解し、Pd(PPh)4と(SnBu3)2を加え、24時間加熱還流を行った。反応溶液を濃縮し、シリカゲルクロマトグラフィー(n-hexane / AcOEt=19 : 1)により精製を行い、目的化合物を無色油状物として得た(175mg, 34%)。
1H-NMR (CDCl3); 0.89 (t, J=7.6, 9H, -CH2CH2 CH 3 ×3), 1.11 (m, 6H, -CH 2 CH2CH3×3), 1.31-1.37 (m, 21H, -CH2 CH 2 CH3×3, pinacol-CH3×4, t-Bu), 1.44 (s, 9H, t-Bu), 2.93 (dd, J=9.2, 14.4, 1H, CH2-α), 3.05 (dd, J=4.4, 14.4, 1H, CH2-β), 4.41 (m, 1H, CH), 4.73 (d, J=8.4, 1H, NH), 7.23 (d, J=7.6, 1H, Ar), 7.68 (dd, J=7,4, 1.2, 1H, Ar), 7.84 (m, J=1.2, 1H, Ar).
(S)-(2-(3-tert-ブトキシ-2-(tert-ブトキシカルボニルアミノ)-3-オキソプロピル)-5-(4,4,5,5-テトラメチル-1,3,2-ジオキサボラン-2-イル)フェニル)(3-メトキシフェニル)ヨードニウム トシレートの製造
実施例4で得られた化合物168mg(0.228 mmol)にトリフルオロエタノール(2mL)を加え、窒素気流下、氷水浴中で1時間撹拌した。氷冷下、ヒドロキシ(3-メトキシフェニル)ヨードニウムトシレート96.1mg(0.228 mmol)を加え、氷水浴中で15分撹拌した。反応混合液を室温にて溶媒留去し、得られた混合物にヘキサン(10 mL)を加えて洗浄、デキャンテーションにて溶液部を除いた。同様の操作を2回行い、得られた混合物の残留溶媒を完全留去し、目的物167mgを得た(収率86 %)。
1H-NMR (DMSO-d6); 1.31 (s, 12H, pinacol-CH3×4), 1.39 (s, 9H, t-Bu), 1.54 (s, 9H, t-Bu), 2.29 (s, 3H, TsOH-CH3), 3.15 (dd, J=10.8, 14.8, 1H, CH2-α), 3.19 (m, 1H, CH2-β, overlapped with water), 3.80 (s, 3H, -OCH3), 4.18 (m, 1H, CH), 7.12 (d, J=8.0, 2H, TsOH-Ar), 7.22 (dd, J=2.8, 8.8, 1H, Ar), 7.11-7.47 (m, 2H, Ar), 7.47 (d, J=8.0, 2H, TsOH-Ar), 7.60-7.71 (m, 2H, Ar), 7.83-7.87 (m, 3H, Ar).
(S)-tert-ブチル 2-(tert-ブチルオキシカルボニルアミノ)-3-(2-ニトロ-4-(ポタッジウムトリフルオロ-2-イル)-2-ニトロフェニル) プロパノエートの製造
化合物6(104mg, 0.211mmol)をMeCN(2mL)に溶解し、その溶液へKF(49mg, 0.844mmol)の水溶液(200μL)を加え、基質が完全に溶解するまで撹拌した。次にL-酒石酸(65mg, 0.433mmol)をTHF(1mL)に溶解し、これを反応溶液へ滴下する。30分撹拌後、MeCNで洗浄しながら生じた沈殿物をろ過し、ろ液を完全に濃縮することで目的物を淡黄色油状物として得た(78.2mg, 78%)。
1H-NMR (CDCl3); 1.25 (s, 12H, pinacol(CH3)4), 1.35 (s, 9H, t-Bu), 3.00 (dd, J=9.6, 13.6, 1H, CH2-α), 3.27 (dd, J=5.6, 14.0, 1H, CH2-β), 4.22 (m, 1H, CH), 5.53 (d, J=8.0, 1H, NH), 7.13 (d, J=7.2, 6H, Ar), 7.57 (dd, J=1.2, 7.6, 1H, Ar), 7.86 (d, J=1.2, 1H, Ar).
(S)-(2-(3-tert-ブトキシ-2-(tert-ブトキシカルボニルアミノ)-3-オキソプロピル)-5-(ポタッジウムトリフルオロ-2-イル)フェニル)(3-メトキシフェニル)ヨードニウム トシレートの製造
化合物107 (79mg, 0.093mmol)をMeCN(1mL)に溶解し、その溶液へKF(22mg, 0.372mmol)の水溶液(100μL)を加え、撹拌した。次にL-酒石酸(28mg, 0.186mmol)をTHF(0.5mL)に溶解し、これを反応溶液へ滴下する。30分撹拌後、MeCNで洗浄しながら生じた沈殿物をろ過し、ろ液を完全に濃縮した後に、Et2O(20mL)を加え終夜撹拌した。生じた沈殿物を濾取することで目的物を無色結晶として得た(35.1mg, 45%)。
1H-NMR (DMSO-d6); 1.31 (s, 9H, t-Bu), 1.44 (s, 9H, t-Bu), 2.29 (s, 3H, TsOH-CH3), 3.06 (dd, J=9.6, 14.8, 1H, CH2-α), 3.20 (m, 1H, CH2-β, overlapped with water), 3.78 (s, 3H, -OCH3), 4.13 (m, 1H, CH), 7.11 (d, J=8.0, 2H, TsOH-Ar), 7.19 (dd, J=2.8, 8.8, 1H, Ar), 7.34-7.49 (m, 3H, Ar), 7.48 (d, J=8.0, 2H, TsOH-Ar), 7.59-7.74 (m, 2H, Ar), 8.21 (m, 1H, Ar).
(9)(S)-tert-ブチル2-(tert-ブトキシカルボニルアミノ)-3-(2-フルオロ-4-(4,4,5,5-テトラメチル-1,3,2-ジオキサボロラン-2-イル)フェニル)プロパノエートの製造
定法により、FBPAに保護基を導入した。1H-NMR (CDCl3); 1.33 (s, 9H, -Boc), 1.40 (s, 21H, t-Bu, pinacol(CH3)4), 3.06 (dd, J=8.8, 13.6, 1H, CH2-α), 3.16 (dd, J=5.2, 13.6, 1H, CH2-β), 4.45 (m, 1H, CH), 5.04 (d, J=8.0, 1H, NH), 7.20 (m, 1H, Ar), 7.42-7.50 (m, 2H, Ar).
実施例1の化合物および実施例3の化合物を用いて、実際にフッ素置換がなされるかの確認試験を実施する。
ヨウド化合物のフッ素置換反応を利用したフッ素標識化反応
実施例1で得られた化合物(0.10mmol)をトルエンに溶解させ、窒素気流下、塩化パラジウムシンナミル錯体(5.0 mol%)、さらに2-ジシクロヘキシルホスフィノ-2,4,6-トリiso-プロピルビフェニル(6.0mol%)を加えた後、フッ素化試薬を添加させる、窒素気流下、100℃にて、1時間反応させる。得られたフッ素標識化合物のHPLC分析を行う。
ジアリルヨウドニウム塩を経由したフッ素標識化反応
実施例3で得られた化合物(2.0 mmol)をジクロロメタンにて溶解させた後、Koser’s reagent (0.81 g, 2.0 mmol)を窒素気流下、添加する。室温にて、2時間攪拌させた後、溶媒を減圧留去させる。残渣をジエチルエーテルにて、固化させ、これを精製せずに、次の工程に供する。これにフッ素化試薬を窒素気流下加え、80℃にて反応させる。得られたフッ素標識化合物のHPLC分析を行う。
ポタジウムトリフルオロ置換化合物を経由したフッ素標識化反応
実施例5で得られた化合物(2.0 mmol)をDMFにて溶解させた後、これにフッ素化試薬を窒素気流下加え、80℃にて反応させる。得られたフッ素標識化合物のHPLC分析を行う。
Claims (8)
- 下記式で表わされる化合物:
- Yが、I、F、NO2、NH2、Sn (R6)3、N=N-NR7R8、OSO2R9、N R10R11、I+R13、(R14-)I+R13のいずれかを表わす(ここで、R6は、メチルまたはn-ブチルを表わし;R7およびR8は、同一または異なって、水素、メチル、エチル、プロピル、ブチル、ヘプチル、トリフルオロメチル、または任意に置換されたフェニル基を表わすか、Nとともにアジリジン、アゼチジン、ピロリジン、ピペリジンを形成し;R9は、メチル、エチル、プロピル、ブチル、ヘプチル、トリフルオロメチル、または任意に置換されたフェニル基を表わし;R10 およびR11は、同一または異なって、メチル、エチル、プロピル、ブチル、ヘプチル、トリフルオロメチル、または任意に置換されたフェニル基を表わすか、NとともにNとともにアジリジン、アゼチジン、ピロリジン、ピペリジンを形成する;R13は、C1-6アルキル置換フェニル基、C1-6アルコキシ置換フェニル基、またはフェニル基を表わすか、N、S、またはOの1または2以上を含む、5~7員の複素環基を表わし、R14は、ハロゲン、テトラフルボレート基、二トレート基、トリフレート基、スルホニルオキシ基、トルエンスルホニルオキシ基、または、パークロレート基を表わす)、請求項1記載の化合物。
- Rは、BR3R4、BX3 -、またはBX3M(ここでXはFを表わし、M+は、アルカリ金属イオン、アンモニウムイオン、テトラアルキルアンモニウムイオン、テトラアリールアンモニウムイオン、テトラアルキルフォスフォニウムイオン、テトラアリールフォスフォニウムイオン、またはイミダゾリウムイオンを表わす)を示し、R3およびR4は、それぞれ、OHを表わすか、R3およびR4が、共に、B(ホウ素原子)と一緒になってBの保護基としての環を形成しており、ここで、環は、ピナコール、2,2-ジメチル-1,3-プロパンジオール、N-メチルジエタノールアミン、1,8-ジアミノナフタレン、N-メチルイミノ二酢酸、1,1,1-トリスハイドロキシメチルエタン、およびカテコールからなる群より選択される、請求項1または2記載の化合物。
- tert-ブチル 2-(tert-ブトキシカルボニルアミノ)-3-(2-ニトロ-4-(4,4,5,5-tetraメチル-1,3,2-ジオキサボロラン-2-イル)フェニル)プロパノエート;
tert-ブチル 3-(2-アミノ-4-(4,4,5,5-tetraメチル-1,3,2-ジオキサボロラン-2-イル)フェニル)-2-(tert-ブトキシカルボニルアミノ)プロパノエート;
ブチル 2-(tert-ブチルオキシカルボニルアミノ)-3-(2-ヨード-4-(4,4,5,5-テトラメチル-1,3,2-ジオキサボロラン-2-イル)フェニル) プロパノエート;
tert-ブチル 2-(tert-ブチルオキシカルボニルアミノ)-3-(4-(4,4,5,5-テトラメチル-1,3,2-ジオキサボロラン-2-イル)-2-(トリn-ブチルスタニル)フェニル) プロパノエート;
tert-ブチル 2-(tert-ブトキシカルボニルアミノ)-3-(2-フルオロ-4-(4,4,5,5-テトラメチル-1,3,2-ジオキサボロラン-2-イル)フェニル)プロパノエート;
(2-(3-tert-ブトキシ-2-(tert-ブトキシカルボニルアミノ)-3-オキソプロピル)-5-(4,4,5,5-テトラメチル-1,3,2-ジオキサボラン-2-イル)フェニル)(3-メトキシフェニル)ヨードニウム トシレート;
tert-ブチル 2-(tert-ブチルオキシカルボニルアミノ)-3-(2-ニトロ-4-(ポタッジウムトリフルオロ-2-イル)-2-ニトロフェニル) プロパノエート;または
(2-(3-tert-ブトキシ-2-(tert-ブトキシカルボニルアミノ)-3-オキソプロピル)-5-(ポタッジウムトリフルオロ-2-イル)フェニル)(3-メトキシフェニル)ヨードニウム トシレート
からなる群より選択される、請求項1~3のいずれか1項記載の化合物。 -
を使用する工程を含む、
下記式で表わされる化合物:
- 下記式で表わされる化合物:
と、
フッ素化試薬とを反応させる工程を含む、18F標識化BPA の製造方法。
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RU2015118150A RU2660433C2 (ru) | 2012-10-15 | 2013-10-08 | Хиральное 4-боронофенилаланиновое (вра) производное и способ его получения и способ получения 18f-меченного вра с использованием указанного производного |
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Cited By (6)
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WO2015093469A1 (ja) * | 2013-12-17 | 2015-06-25 | ステラファーマ株式会社 | 2-フルオロ-4-ボロノ-l-フェニルアラニンの製造方法および2-フルオロ-4-ボロノ-l-フェニルアラニンの前駆体 |
WO2015129374A1 (ja) * | 2014-02-28 | 2015-09-03 | ステラファーマ株式会社 | 18f原子が導入された4‐ボロノ-l-フェニルアラニンの製造方法および18f原子が導入された4‐ボロノ-l-フェニルアラニンの前駆体 |
JP2016204314A (ja) * | 2015-04-23 | 2016-12-08 | 国立研究開発法人理化学研究所 | 化合物及び4−ボロノフェニルアラニン誘導体の製造方法 |
JP2020011928A (ja) * | 2018-07-19 | 2020-01-23 | Jfeエンジニアリング株式会社 | 4−ボロノフェニルアラニン前駆体、2−[18f]フルオロ−4−ボロノフェニルアラニン前駆体の製造方法、2−[18f]フルオロ−4−ボロノフェニルアラニンの製造方法 |
CN111729622A (zh) * | 2020-04-22 | 2020-10-02 | 上海交通大学医学院附属第九人民医院 | 一种苯丙氨酸衍生的手性超分子水凝胶及其应用 |
JP2021533176A (ja) * | 2018-08-17 | 2021-12-02 | 南京中硼▲聯▼康医▲療▼科技有限公司Neuboron Medtech Ltd. | 18f−bpaの製造方法及び中間体 |
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CN105348309B (zh) * | 2015-11-19 | 2017-05-17 | 中国原子能科学研究院 | F‑bpa的亲核合成方法 |
CN109384806B (zh) * | 2017-08-03 | 2021-04-27 | 王璐 | 一种[18f]fbpa新型制备方法 |
CN112979684B (zh) * | 2019-12-13 | 2023-11-03 | 南京江原安迪科正电子研究发展有限公司 | 制备18f-bpa的方法 |
CN113045592A (zh) * | 2019-12-26 | 2021-06-29 | 南京江原安迪科正电子研究发展有限公司 | 18f-bpa的制备方法 |
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RU2660433C2 (ru) | 2018-07-06 |
RU2015118150A (ru) | 2016-12-10 |
JP6248042B2 (ja) | 2017-12-13 |
TWI624472B (zh) | 2018-05-21 |
EP2907818B1 (en) | 2018-08-15 |
EP2907818A1 (en) | 2015-08-19 |
JPWO2014061508A1 (ja) | 2016-09-05 |
TW201427984A (zh) | 2014-07-16 |
EP2907818A4 (en) | 2016-05-04 |
US9409926B2 (en) | 2016-08-09 |
US20150329564A1 (en) | 2015-11-19 |
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