Patent Application
20240108607
The present invention relates to a method for manufacturing a novel nitrogen-containing compound or a salt thereof and a manufacturing intermediate of the compound or a salt thereof.
Integrins are a kind of cell adhesion receptors which constitute a family of heterodimeric glycoprotein complexes formed of α and β subunits and are mainly involved in the cell adhesion to extracellular matrix and the transmission of information from extracellular matrix. Among the integrins, integrins αvβ3 and αvβ5 which are vitronectin receptors are known to be expressed at a low level on epithelial cells or matured endothelial cells while hyper-expressed in various tumor cells or new blood vessels. The hyper-expression of integrins αvβ3 and αvβ5 is considered to be involved in the exacerbation of cancer such as infiltration or metastasis accompanying tumor angiogenesis and be highly correlated to the malignancy (Nature Reviews cancer, Vol. 10, pp. 9-23, 2010). It has been revealed that the hyper-expression of integrin is observed in cancer such as head and neck cancer, colorectal cancer, breast cancer, small cell lung cancer, non-small cell lung cancer, glioblastoma, malignant melanoma, pancreatic cancer, and prostatic cancer (Clin. Cancer Res. Vol. 12, pp. 3942-3949, 2006).
Furthermore, it has been revealed that, in the integrin-related diseases such as ischemic diseases including an ischemic heart disease or a peripheral vascular disease, the integrin is hyper-expressed in endothelial cells of blood vessels at the time of angiogenesis following ischemia (Circulation, Vol. 107, pp. 1046-1052, 2003).
The relationship between the aforementioned diseases and the expression of integrin is very interesting as a target of pharmaceutical products, and there are reports relating to the treatment using a low-molecular weight compound (U.S. Pat. Nos. 6,001,961A, 6,130,231A, US2002/169200A, and US2001/53853A) or a compound into which a radioactive isotope is introduced (JP2002-532440A, WO2013/048996, and WO2011/149250A) or relating to the imaging of diseases.
For example, an attempt at performing imaging by using a peptide ligand having an Arg-Gly-Asp (RGD) sequence is reported in Cancer Res. Vol. 61, pp. 1781-1785, 2001, Cardiovascular Research, Vol. 78, pp. 395-403, 2008, and the like, and an attempt using a non-peptide low-molecular weight compound is reported in Cardiovascular Research, Vol. 78, pp. 395-403, 2008, and the like. In addition, the compound into which 18F of a positron nuclide is introduced (Clin. Cancer Res., Vol. 13, pp. 6610-6616, 2007 and J. Nucl. Med., Vol. 49, pp. 879-886, 2008) is used to portray a human tumor (Cancer Res., Vol. 62, pp. 6146-6151, 2002 and Int. J. Cancer., Vol. 123, pp. 709-715, 2008)
According to the knowledge of the inventors of the present invention, a nitrogen-containing compound represented by the following Formula [11] is an excellent integrin-binding compound which exhibits high integrating properties and persistency with respect to angiogenesis and tumor relating to integrins and shows a high clearance rate in blood. The complex of the nitrogen-containing compound represented by Formula [11] or a salt thereof and a metal is useful as a treatment agent for diagnosis or treatment of integrin-related diseases.
(In the formula, L1 represents a group represented by Formula [2a]
Specific examples of the nitrogen-containing compound represented by Formula [11] include 2,2′,2″-(10-(2-(((R)-1-((2-(4-(4-(N—((S)-1-carboxy-2-(5-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)ethyl)sulfamoyl)-3,5-diemthylphenoxy)butanamide)ethyl)amino)-1-oxo-3-sulfopropan-2-yl)amino)-2-oxoethyl)-1,4,7,10-tetraazacyclododecane-1,4,7-triyl)triacetic acid (hereinafter, referred to as a compound A as well), 2,2′-(7-((R)-1-carboxy-4-(((R)-1-((2-(4-(4-(N—((S)-1-carboxy-2-(5-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)ethyl)sulfamoyl)-3,5-dimethylphenoxy)pentanamide)ethyl)amino)-1-oxo-3-sulfopronan-2-yl)amino)-4-oxobutyl)-1,4,7-triazonane-1,4-diyl)diacetic acid (hereinafter, referred to as a compound B as well), and the like.
Objects of the present invention are to provide an efficient method for manufacturing a nitrogen-containing compound used for manufacturing a treatment agent for treating integrin-related diseases or a salt thereof and to provide a manufacturing intermediate of the compound or the salt.
In order to achieve the aforementioned objects, the inventors of the present invention repeated thorough research. As a result, they found that, by the following manufacturing method, a nitrogen-containing compound used for manufacturing a treatment agent for treating integrin-related diseases or a salt thereof can be efficiently manufactured. Furthermore, they found that the following manufacturing intermediate is an intermediate advantageous for efficiently manufacturing the nitrogen-containing compound used for manufacturing a treatment agent for treating integrin-related diseases or a salt thereof. Based on what they found, the inventors accomplished the present invention.
That is, the present invention provides the following.
According to the manufacturing method of the present invention, it is possible to industrially obtain a novel nitrogen-containing compound having high optical purity or a salt thereof in a simple manner through short steps.
Furthermore, the manufacturing intermediate of the present invention is useful as an intermediate of a novel nitrogen-containing compound or a salt thereof.
Hereinafter, the present invention will be specifically described.
In the present invention, unless otherwise specified, each term has the following meaning.
A halogen atom means a fluorine atom, a chlorine atom, a bromine atom, or an iodine atom.
A C1-6 alkyl group means a linear or branched C1-6 alkyl group such as an ethyl, methyl, propyl, isopropyl, butyl, sec-butyl, isobutyl, tert-butyl, pentyl, isopentyl, 2-methylbutyl, 2-pentyl, 3-pentyl, or hexyl group.
A C2-6 alkyl group means a linear or branched C2-6 alkyl group such as an ethyl, propyl, isopropyl, butyl, sec-butyl, isobutyl, tert-butyl, pentyl, isopentyl, 2-methylbutyl, 2-pentyl, 3-pentyl, or hexyl group.
A C3-8 cycloalkyl group means a C3-8 cycloalkyl group such as a cyclopropyl, cyclobutyl, cyclopentyl, or cyclohexyl group.
An aryl group means a C6-13 aryl group such as a phenyl, naphthyl, or fluorenyl group.
An Ar C1-6 alkyl group means a C6-10 Ar C1-6 alkyl group such as a benzyl, diphenylmethyl, trityl, phenethyl, 2-phenylpropyl, 3-phenylpropyl, or naphthylmethyl group.
A C1-6 alkoxy group means a linear, cyclic, or branched C1-6 alkyloxy group such as a methoxy, ethoxy, propoxy, isopropoxy, cyclopropoxy, butoxy, isobutoxy, sec-butoxy, tert-butoxy, cyclobutoxy, pentyloxy, or hexyloxy group.
A C1-6 alkoxy C1-6 alkyl group means a C1-6 alkyloxy C1-6 alkyl group such as a methoxymethyl or 1-ethoxyetyl group.
A C1-6 alkylamino group means a linear, branched, or cyclic C1-6 alkylamino group such as a methylamino, ethylamino, propylamino, isopropylamino, cyclopropylamino, butylamino, sec-butylamino, tert-butylamino, cyclobutylamino, pentylamino, cyclopentylamino, hexylamino, or cyclohexylamino group.
A di(C1-6 alkyl)amino group means a linear, branched, or cyclic di(C1-6 alkyl)amino group such as a dimethylamino, diethylamino, dipropylamino, diisopropylamino, dibutylamino, di(tert-butyl)amino, dipentylamino, dihexylamino, (ethyl)(methyl)amino, (methyl)(propyl)amino, (cyclopropyl)(methyl)amino, (cyclobutyl)(methyl)amino, or (cyclohexyl)(methyl)amino group.
A C2-6 alkanoyl group means a linear or branched C2-6 alkanoyl group such as an acetyl, propionyl, valeryl, isovaleryl, or pivaloyl group.
An aroyl group means a C6-10 aryl group such as a benzoyl or naphthoyl group.
A heterocyclic carbonyl group means a monocyclic or bicyclic heterocyclic carbonyl group such as a furoyl, thenoyl, pyrrolidinylcarbonyl, piperidinylcarbonyl, piperazinylcarbonyl, morpholinylcarbonyl, or pyridinylcarbonyl group.
An acyl group means a formyl group, a C2-6 alkanoyl group, an aroyl group, or a heterocyclic carbonyl group.
A C1-6 alkoxycarbonyl group means a linear or branched C1-6 alkyloxycarbonyl group such as a methoxycarbony, ethoxycarbonyl, isopropoxycarbonyl, tert-butoxycarbonyl, or 1,1-dimethylpropoxycarbonyl group.
An Ar C1-6 alkoxycarbonyl group means a C6-13 Ar C1-6 alkyloxycarbonyl group such as a benzyloxycarbonyl, phenethyloxycarbonyl, or fluorenylmethyloxycarbonyl group.
An aryloxycarbonyl group means a C6-10 aryloxycarbonyl group such as a phenyloxycarbonyl or naphthyloxycarbonyl group.
A C1-6 alkylsulfonyl group means a C1-6 alkylsulfonyl group such as a methylsulfonyl, ethylsulfonyl, or propylsulfonyl group.
An arylsulfonyl group means a C6-10 arylsulfonyl group such as a benzenesulfonyl, p-toluenesulfonyl, or naphthalenesulfonyl group.
A C1-6 alkylsulfonyloxy group means a C1-6 alkylsulfonyloxy group such as a methylsulfonyloxy or ethylsulfonyloxy group.
An arylsulfonyloxy group means a C6-10 arylsulfonyloxy group such as a benzenesulfonyloxy or p-toluenesulfonyloxy group.
A heterocyclic sulfonyl group means a monocyclic or bicyclic heterocyclic sulfonyl group such as a piperidinesulfonyl, pyridinesulfonyl, quinolinesulfonyl, dihydrobenzofuransulfonyl, benzofuransulfonyl, chromanesulfonyl, and chromenesulfonyl.
A monocyclic nitrogen-containing heterocyclic group means a monocyclic heterocyclic group containing only nitrogen atoms as heteroatoms forming the ring, such as an aziridinyl, azetidinyl, pyrrolidinyl, pyrrolinyl, pyrrolyl, piperidyl, tetrahydropyridyl, dihydropyridyl, pyridyl, homopiperidinyl, octahydroazocinyl, imidazolidinyl, imidazolinyl, imidazolyl, pyrazolidinyl, pyrazolinyl, pyrazolyl, piperazinyl, pyrazinyl, pyridazinyl, pyrimidinyl, homopiperazinyl, triazolyl, or tetrazolyl group.
A monocyclic oxygen-containing heterocyclic group means a monocyclic heterocyclic group containing only oxygen atoms as heteroatoms forming the ring, such as an oxetanyl, tetrahydrofuranyl, furanyl, tetrahydropyranyl, pyranyl, 1,3-dioxanyl, or 1,4-dioxanyl group.
A monocyclic sulfur-containing heterocyclic group means a monocyclic heterocyclic group containing only sulfur atoms as heteroatoms forming the ring, such as a thienyl group.
A monocyclic nitrogen·oxygen-containing heterocyclic group means a monocyclic heterocyclic group containing only nitrogen atoms and oxygen atoms as heteroatoms forming the ring, such as an oxazolyl, isoxazolyl, oxadiazolyl, morpholinyl, or oxazepanyl group.
A monocyclic nitrogen·sulfur-containing heterocyclic group means a monocyclic heterocyclic group containing only nitrogen atoms and sulfur atoms as heteroatoms forming the ring, such as a thiazolyl, isothiazolyl, thiadiazolyl, monomorpholinyl, 1-oxidothiomorpholinyl, or 1,1-dioxidothiomorpholinyl group.
A monocyclic heterocyclic group means a monocyclic nitrogen-containing heterocyclic group, a monocyclic oxygen-containing heterocyclic group, a monocyclic sulfur-containing heterocyclic group, a monocyclic nitrogen·oxygen-containing heterocyclic group, or a monocyclic nitrogen·sulfur-containing heterocyclic group.
A bicyclic nitrogen-containing heterocyclic group means a bicyclic heterocyclic group containing only nitrogen atoms as heteroatoms forming the ring, such as an indolinyl, indolyl, isoindolinyl, isoindolyl, benzimidazolyl, indazolyl, benzotriazolyl, pyrazolopyridinyl, quinolyl, tetrahydroquinolinyl, tetrahydroisoquinolinyl, isoquinolinyl, quinolidinyl, cinnolinyl, phthalazinyl, quinazolinyl, dihydroquinoxalinyl, quinoxalinyl, naphthyridinyl, purinyl, phtheridinyl, or quinuclidinyl group.
A bicyclic oxygen-containing heterocyclic group means a bicyclic heterocyclic group containing only oxygen atoms as heteroatoms forming the ring, such as a dihydrobenzofuranyl, benzofuranyl, isobenzofuranyl, dihydrobenzofuranyl, chromanyl, chromenyl, isochromanyl, chromanyl, 1,3-benzodioxolyl, 1,3-benzodioxanyl, or 1,4-benzodioxanyl group.
A bicyclic sulfur-containing heterocyclic group means a bicyclic heterocyclic group containing only sulfur atoms as heteroatoms forming the ring, such as a 2,3-dihydrobenzothienyl or benzothienyl group.
A bicyclic nitrogen·oxygen-containing heterocyclic group means a bicyclic heterocyclic group containing only nitrogen atoms and oxygen atoms as heteroatoms forming the ring, such as a benzoxazolyl, benzisoxazolyl, benzoxadiazolyl, benzomorpholinyl, dihydropyranopyridyl, dioxopyrrolidyl, fluoropyridinyl, dihydrodioxinopyridyl, or dihydropyridooxazinyl group.
A bicyclic nitrogen·sulfur-containing heterocyclic group means a bicyclic heterocyclic group containing only nitrogen atoms and sulfur atoms as heteroatoms forming the ring, such as a benzothiazolyl, benzisothiazolyl, or benzothiadiazolyl group.
A bicyclic heterocyclic group means a bicyclic nitrogen-containing heterocyclic group, a bicyclic oxygen-containing heterocyclic group, a bicyclic sulfur-containing heterocyclic group, a bicyclic nitrogen·oxygen-containing heterocyclic group, or a bicyclic nitrogen·sulfur-containing heterocyclic group.
A heterocyclic group means a monocyclic heterocyclic group or a bicyclic heterocyclic group.
A silyl group means a trialkylsilyl group such as a trimethylsilyl, triethylsilyl, or tributylsilyl group.
An amino-protecting group includes all of the groups that can be used as a general amino group-protecting group, and examples thereof include those described in W. Greene et al., Protective Groups in Organic Synthesis, 4th edition, pp. 696-926, 2007, John Wiley & Sons, INC. Specifically, examples of the amino-protecting group include an Ar C1-6 alkyl group, a C1-6 alkoxy C1-6 alkyl group, an acyl group, a C1-6 alkoxycarbonyl group, an Ar C1-6 alkoxycarbonyl group, an aryloxycarbonyl group, a C1-6 alkylsulfonyl group, a heterocyclic sulfonyl group, an arylsulfonyl group, a silyl group, and the like. These groups may be substituted with one or more substituents selected from the substituent group A.
Substituent group A: a halogen atom, a nitro group, a cyano group, an amino group which may be protected, ahydroxyl group which may be protected, a C1-6 alkyl group, a C3-8 cycloalkyl group, an aryl group, a C1-6 alkoxy group, a C1-6 alkylamino group, a di(C1-6 alkyl)amino group, a heterocyclic group, and an oxy group.
A carboxyl-protecting group include all of the groups that can be used as a general carboxyl group-protecting group, and examples thereof include those described in W. Greene et al., Protective Groups in Organic Synthesis, 4th edition, pp. 533˜646, 2007, John Wiley & Sons, INC. Specific examples of the carboxyl-protecting group include a C1-6 alkyl group, an aryl group, a benzyl group, an Ar C1-6 alkyl group, a C1-6 alkoxy C1-6 alkyl group, a silyl group, and the like. These groups may be substituted with one or more substituents selected from the substituent group A.
A hydroxyl-protecting group include all of the groups that can be used as a general hydroxyl group-protecting group, and examples thereof include those described in W. Greene et al., Protective Groups in Organic Synthesis, 4th edition, pp. 16˜299, 2007, John Wiley & Sons, INC. Specific examples of the hydroxyl-protecting group include a C1-6 alkyl group, an Ar Ci-6 alkyl group, a C1-6 alkoxy C1-6 alkyl group, an acyl group, a C1-6 alkoxycarbonyl group, an Ar C1-6 alkoxycarbonyl group, a C1-6 alkylsulfonyl group, an arylsulfonyl group, a silyl group, a tetrahydrofuranyl group, a tetrahydropyranyl group, and the like. These groups may be substituted with one or more substituents selected from the substituent group A.
Examples of a leaving group include a halogen atom, a C1-6 alkylsulfonyloxy group, an arylsulfonyloxy group, and the like. The C1-6 alkylsulfonyloxy group and the arylsulfonyloxy group may be substituted with one or more substituents selected from the substituent group A.
Examples of halogenated hydrocarbons include methylene chloride, chloroform, dichloroethane, and the like.
Examples of ethers include diethylether, diisopropylether, dioxane, tetrahydrofuran, anisole, ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, and the like.
Examples of alcohols include methanol, ethanol, propanol, 2-propanol, butanol, 2-methyl-2-propanol, and the like.
Examples of esters include methyl acetate, ethyl acetate, propyl acetate, butyl acetate, and the like.
Examples of amides include N,N-dimethylformamide, N,N-dimethylacetamide, N-methylpyrrolidone, and the like.
Examples of nitriles include acetonitrile, propionitrile, and the like.
Examples of an inorganic base include sodium hydroxide, potassium hydroxide, lithium hydroxide, sodium tert-butoxide, potassium tert-butoxide, sodium hydrogen carbonate, sodium carbonate, potassium carbonate, lithium carbonate, cesium carbonate, and the like.
Examples of an organic base include triethylamine, N,N-diisopropylethylamine, 1,8-diazabicyclo(5.4.0)undec-7-ene (DBU), 4-dimethylaminopyridine, pyridine, imidazole, N-methylimidazole, N-methylmorpholine, and the like.
Examples of the salt of the compound represented by Formula [1], [3]. [10], [11], or [19] include a generally known salt in a basic group such as an amino group and in an acidic group such as a hydroxyl group and a carboxyl group.
Examples of the salt in a basic group include a salt with a mineral acid such as hydrochloric acid, hydrobromic acid, nitric acid, and sulfuric acid; a salt with organic carboxylic acid such as formic acid, acetic acid, citric acid, oxalic acid, fumaric acid, maleic acid, succinic acid, malic acid, tartaric acid, aspartic acid, trichloroacetic acid, and trifluoroacetic acid; and a salt with a sulfonic acid such as methanesulfonic acid, benzenesulfonic acid, p-toluenesulfonic acid, mesitylenesulfonic acid, and naphthalenesulfonic acid.
Examples of the salt in an acidic group include a salt with an alkali metal such as lithium, sodium, and potassium; a salt with an alkaline earth metal such as potassium and magnesium; an ammonium salt; a salt with a nitrogen-containing organic base such as trimethylamine, triethylamine, tributylamine, pyridine, N,N-dimethylaniline, N-methylpiperidine, N-methylmorpholine, diethylamine, dicyclohexylamine, procaine, dibenzylamine, N-benzyl-β-phenethylamine, 1-ephenamine, and N,N′-dibenzylethylenediamine; and the like.
Among the above salts, pharmacologically acceptable salts are exemplified as preferred salts.
Examples of a metal of metal ion and a metal complex include a paramagnetic metal, an X-ray-absorbing metal, a radioactive metal, and the like.
In a case where a metal complex is used as a treatment agent for diagnosis or treatment, examples of the metal complex include the following metal complexes according to the use thereof.
Examples of the metal complex used in a treatment agent for nuclear magnetic resonance diagnosis or the like include complexes containing a paramagnetic metal ion (for example, an ion of a metal selected from the group consisting of Co, Mn, Cu, Cr, Ni, V, Au, Fe, Eu, Gd, Dy, Tb, Ho, and Er) as a metal component.
Examples of the metal complex used in a treatment agent for X-ray diagnosis or the like include complexes containing an X-ray-absorbing metal ion (for example, an ion of a metal selected from the group consisting of Re, Sm, Ho, Lu, Pm, Y, Bi, Pb, Os, Pd, Gd, La, Au, Yb, Dy, Cu, Rh, Ag, and Ir) as a metal component.
Examples of the metal complex used in a treatment agent for radiodiagnosis, treatment, or the like include complexes containing a non-cytotoxic radioactive metal ion (for example, an ion of a metal selected from the group consisting of a 18F aluminum complex, a 18F gallium complex, a 18F indium complex, a 18F lutetium complex, a 18F thallium complex, 44Sc, 47Sc, 51Cr, 52Mn, 55Co, 57Co, 58Co, 52Fe, 59Fe, 60Co, 62Cu, 64Cu, 67Cu, 67Ga, 68Ga, 72As, 72Se, 73Se, 75Se, 76As, 82Rb, 82Sr, 85Sr, 89Sr, 89Zr, 86Y, 87Y, 90Y, 95Tc, 99mTc, 103Ru, 103Pd, 105Rh, 109Pd, 111In, 114In, 117Sn, 111Ag, 113mIn, 140La, 149Pm, 149Tb, 152Tb, 155Tb, 161Tb, 153Sm, 159Gd, 165Dy, 166Dy, 166Ho, 165Er, 169Yb, 175Yb, 177Lu, 186Re, 188Re, 192Ir, 197Hg, 198Au, 199Au, 201Tl, 203Hg, 211At, 212Bi, 212Pb, 213Bi, 217Bi, 223Ra, 225Ac, and 227Th) as a metal component.
In a case where a metal complex is used as a treatment agent for radiodiagnosis, as a metal, a non-cytotoxic radioactive metal can be used.
Examples of the non-cytotoxic radioactive metal include a gamma ray-emitting nuclide and a positron-emitting nuclide. Specific examples thereof include a 18F aluminum complex, 18F gallium complex, 18F indium complex, 18F lutetium complex, 18F thallium complex, 99mTc, 111In, 113mIn, 114In, 67Ga, 68Ga, 82Rb, 86Y, 87Y, 152Tb, 155Tb, 201Tl, 51Cr, 52Fe, 57Co, 58Co, 60Co, 82Sr, 85Sr, 197Hg, 44Sc, 62Cu, 64Cu, 89Zr, and the like.
In a case where a metal complex is used as a treatment agent for radiotherapy, as a metal, a cytotoxic radioactive metal can be used.
Examples of the cytotoxic radioactive metal include α-ray-emitting nuclide and a β-ray-emitting nuclide. Specific examples thereof include 90Y, 114In, 117mSn, 186Re, 188Re, 64Cu, 67Cu, 59Fe, 89Sr, 198Au, 203Hg, 212Pb, 165Dy, 103Ru, 149Tb, 161Tb, 212Bi, 166Ho, 165Er, 153Sm, 177Lu, 213Bi, 223Ra, 225Ac, 227Th, and the like.
The treatment means diagnosis or treatment for various diseases.
The diagnosis means a process of determining whether a certain disease is a disease of interest or determining the state of a disease of interest.
The treatment means the improvement of the state of a disease of interest, the inhibition of the progress of a disease of interest, or the like.
The treatment agent means a substance administered for the procedure.
R1 is preferably a hydrogen atom, a C1-6 alkoxycarbonyl group which may be substituted, a heterocyclic sulfonyl group which may be substituted, or an arylsulfonyl group which may be substituted, more preferably a hydrogen atom, a C1-6 alkoxycarbonyl group which may be substituted with one or more substituents selected from the substituent group A, a heterocyclic sulfonyl group which may be substituted with one or more substituents selected from the substituent group A, or an arylsulfonyl group which may be substituted with one or more substituents selected from the substituent group A, and even more preferably a hydrogen atom, a C1-6 alkoxycarbonyl group, a 2,2,4,6,7-pentamethyldihydrobenzofuran-5-sulfonyl group, or a 2,2,5,7,8-pentamethylchromane-6-sulfonyl group.
R2 is preferably a C1-6 alkyl group which may be substituted or a benzyl group which may be substituted, more preferably a C1-6 alkyl group which may be substituted with one or more substituents selected from the substituent group A or a benzyl group which may be substituted with one or more substituents selected from the substituent group A, even more preferably a C1-6 alkyl group which may be substituted with a halogen atom or a benzyl group which may be substituted with one or more groups selected from a halogen atom, a nitro group, and a C1-6 alkoxy group, and particularly preferably a C1-6 alkyl group which may be substituted with a halogen atom.
R7 is preferably a C1-6 alkyl group which may be substituted or a benzyl group which may be substituted, more preferably a C1-6 alkyl group which may be substituted with one or more substituents selected from the substituent group A or a benzyl group which may be substituted with one or more substituents selected from the substituent group A, even more preferably a C1-6 alkyl group which may be substituted with a halogen atom or a benzyl group which may be substituted with one or more groups selected from a halogen atom, a nitro group, and a C1-6 alkoxy group, and particularly preferably a C1-6 alkyl group which may be substituted with a halogen atom.
R8 is preferably a C2-6 alkyl group which may be substituted, a C2-6 alkyl group which may be substituted with one or more substituents selected from the substituent group A, or a benzyl group which may be substituted with one or more substituents selected from the substituent group A, even more preferably a C2-6 alkyl group which may be substituted with a halogen atom or a benzyl group which may be substituted with one or more groups selected from a halogen atom, a nitro group, and a C1-6 alkoxy group, and still more preferably a C2-6 alkyl group.
R9 is preferably a hydrogen atom or a group represented by Formula [20].
(In the formula, *, R10, and L2 have the same definition as *, R10, and L2 described above.)
In a case where R9 is an amino-protecting group, the amino-protecting group is preferably a C1-6 alkyl group which may be substituted with one or more substituents selected from the substituent group A, a C1-6 alkoxycarbonyl group which may be substituted with one or more substituents selected from the substituent group A, or an Ar C1-6 alkoxycarbonyl group which may be substituted with one or more substituents selected from the substituent group A, and more preferably a benzyl group, a tert-butoxycarbonyl group, a benzyloxycarbonyl group, or a 9-fluorenylmethyloxycarbonyl group.
L1 is preferably a group represented by Formula [18a].
(In the formula, R5a, R6a, and r1 have the same definition as R5a, R6a, and r1 described above.)
L2 is preferably a group represented by Formula [18b].
(In the formula, R5b, R6b, and r2 have the same definition as R5b, R6b, and r2 described above.)
L3 is preferably a group represented by Formula [18c].
(In the formula, R5c, R6c, and r3 have the same definition as R5c, R6c, and r3 described above.)
A1 is preferably a group represented by Formula [4] or [5].
(In the formula, * and R7 have the same definition as * and R7 described above.)
A2 is preferably a group represented by Formula [12] or [13].
(In the formula, * has the same definition as * described above.)
As the non-cytotoxic radioactive metal, from the viewpoint of the half-life, the radiation energy, the ease of a labeling reaction, and the like, a 18F aluminum complex, 111In, 67Ga, 68Ga, 64Cu, and 89Zr are preferable.
As the cytotoxic radioactive metal, from the viewpoint of the half-life, the radiation energy, the ease of a labeling reaction, and the stability of the complex, 64Cu, 67Cu, 90Y 153Sm, 166Ho, 177Lu, and 225Ac are preferable.
Next, the manufacturing method of the present invention will be described.
(In the formulae, R1, R2, L1, L2, L3, A1, A2, and m have the same definition as R1, R2, L1, L2, L3, A1, A2, and m described above).
(1)
By performing a reaction between the compound represented by Formula [1] and the compound represented by Formula [3] in the presence of a condensing agent and in the presence or absence of a base, the compound represented by Formula [10] can be manufactured.
This reaction can be performed by the methods described, for example, in Bioconjugate Chem. Vol. 3, p. 2, 1992, Chemical Reviews, Vol. 97, p. 2243, 1997, and the like.
The solvent used in this reaction is not particularly limited as long as the solvent does not affect the reaction. Examples of the solvent include ethers, esters, halogenated hydrocarbons, nitriles, amides, alcohols, and water, and these solvents may be used by being mixed together. As the solvent, amides are preferable, and N,N-dimethylformamide, N,N-dimethylacetamide, and N-methylpyrrolidone are more preferable.
The amount of the solvent used is not particularly limited, and may be greater than the amount of the compound represented by Formula [1] by a factor of 1 to 1,000 (v/w).
Examples of the base that is used as desired in this reaction include an inorganic base and an organic base. As the base, an organic base is preferable, and triethylamine or N,N-diisopropylethylamine is more preferable.
The amount of the base used may be greater than the amount of the compound represented by Formula [1] by a factor of 1 to 50 in terms of mole, and preferably greater than the amount of the compound by a factor of 1 to 10 in terms of mole.
Examples of the condensing agent used in this reaction include carbodiimides such as N,N′-dicyclohexylcarbodiimide and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide; carbonyls such as carbonyldiimidazole; acid azides such as diphenylphosphoryl azide; acid cyanides such as diethylphosphoryl cyanide; active carbamates such as 2-ethoxy-1-ethoxycarbonyl-1,2-dihydroquinoline; ureas such as O-benzotriazol-1-yl-1,1,3,3-tetramethyluronium=hexafluorophosphate and O-(7-azabenzotriazol-1-yl)-1,1,3,3-tetramethyluronium=hexafluorophosphate; a phosphonium salt such as benzotriazol-1-yloxy-trisdimethylaminophosphonium hexafluorophosphate and (benzotriazol-1-yloxy)tripyrrolidinophosphonium hexafluorophosphate; and the like. As the condensing agent, carbodiimides or ureas are preferable, and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, 0-benzotriazol-1-yl-1,1,3,3-tetramethyluronium=hexafluorophosphate, and O-(7-azabenzotriazol-1-yl)-1,1,3,3-tetramethyluronium=hexafluorophosphate are more preferable.
As a condensing method, after the compound represented by Formula [1] and the compound represented by Formula [3] are mixed together, the condensing agent may be added. As another method, after being activated in advance by the condensing agent, the compound represented by Formula [1] may be reacted with the compound represented by Formula [3]. Furthermore, it is possible to use an active ester such as N-hydroxysuccinimide or pentafluorophenol.
The amount of the compound represented by Formula [3] used is not particularly limited, and may be greater than the amount of the compound represented by Formula [1] by a factor of 0.5 to 10 in terms of mole.
The reaction temperature may be −30° C. to 100° C., and is preferably 0° C. to 50° C.
The reaction time may be 1 minute to 72 hours.
(2)
By deprotecting the compound represented by Formula [10], the compound represented by Formula [11] can be manufactured.
This reaction can be performed, for example, by the method described in T. W. Greene et al., Protective Groups in Organic Synthesis, 4th edition, pp. 696-926, 2007, John Wiley & Sons, INC.
As the method for deprotecting the compound represented by Formula [10], by deprotecting the compound by using an acid, the decrease of optical purity of the compound represented by Formula [11] can be inhibited.
Examples of the acid include hydrochloric acid, hydrobromic acid, sulfuric acid, methanesulfonic acid, acetic acid, formic acid, p-toluenesulfonic acid, trifluoromethanesulfonic acid, trifluoroacetic acid, and the like. Among these, hydrochloric acid, formic acid, and trifluoroacetic acid are preferable.
The amount of the acid used may be equal to or greater than the amount of the compound represented by Formula [10] by a factor of 1 (w/w), and is preferably greater than the amount of the compound by a factor of 1 to 100 (w/w). The acid may be used singly as a solvent, or may be used by being diluted with a solvent that does not affect the reaction.
A complex of the compound represented by Formula [11] or a salt thereof and a metal can be manufactured as below, for example.
By mixing the compound represented by Formula [11] or a salt thereof with a metal ion in the presence of a buffer solution, the complex can be manufactured.
The buffer solution used in this reaction is not particularly limited as long as the buffer solution does not affect the reaction. Examples of the buffer solution include a sodium acetate buffer solution, an ammonium acetate buffer solution, a sodium citrate buffer solution, and an ammonium citrate buffer solution.
The pH of the buffer solution is preferably within a range of 3 to 6.
The reaction temperature and the reaction time vary with the combination of the compound represented by Formula [11] or a salt thereof and a radioactive metal, but may be 0° C. to 150° C. and 5 to 60 minutes respectively.
The complex obtained by the aforementioned manufacturing method can be isolated and purified by a general method such as extraction, crystallization, distillation, or column chromatography.
In a case where a radioactive metal is used as a metal, the complex can also be manufactured based on the aforementioned manufacturing method. Considering the fact that the radioactive metal emits radiation and the fact that the radioactive metal is a trace metal, attention needs to be paid to the following points.
It is not preferable to unnecessary prolong the reaction time, because the compound is likely to be decomposed due to radiation. Generally, a labeled compound can be obtained at a radiochemical yield of greater than 80%. However, in a case where higher purity is required, the compound can be purified by a method such as preparative liquid chromatography, preparative TLC, dialysis, solid phase extraction, and/or ultrafiltration.
Furthermore, by regarding a metal fluoride complex, which is a combination of a fluoride and a metal, as a metal, a complex can be manufactured by performing a reaction between the metal fluoride complex and the compound represented by Formula [11] or a salt thereof. This reaction can be performed, for example, by the method described in JP5388355A.
In order to inhibit the decomposition caused by radiation, it is preferable to add an additive such as gentisic acid, ascorbic acid, benzyl alcohol, tocopherol, gallic acid, a gallic acid ester, or α-thioglycerol.
Next, the method for manufacturing raw materials for manufacturing will be described.
(In the formulae, X represents a halogen atom; Ra represents an amino-protecting group; and R1, R2, L1, and L2 have the same definition as R1, R2, L1, and L2 described above.)
As the compound represented by Formula [24], for example, 4-(4-(chlorosulfonyl)-3,5-dimethylphenoxy)butanoic acid is known.
(1)
By deprotecting the protecting group Ra of the compound represented by Formula [22], the compound represented by Formula [23] can be manufactured.
This reaction may be performed based on (2) of Manufacturing method 1, under the condition in which the amino-protecting group R1 and the carboxyl-protecting group R2 are not simultaneously deprotected. For example, in a case where the amino-protecting group R1 and the carboxyl-protecting group R2 are protecting groups that can be deprotected under the acidic conditions, as Ra, a protecting group such as benzyloxycarbonyl group that can be deprotected through hydrogenation reduction under the neutral conditions or a protecting group such as 9-fluorenyloxycarbonyl group that can be deprotected under the basic conditions is selected, and treated under the neutral conditions or the basic conditions.
(2)
By performing a reaction between the compound represented by Formula [23] and the compound represented by Formula [24] in the presence of a base, the compound represented by Formula [1] can be manufactured.
The solvent used in this reaction is not particularly limited as long as the solvent does not affect the reaction. Examples of the solvent include ethers, esters, halogenated hydrocarbons, nitriles, and amides. These solvents may be used by being mixed together. As the solvent, halogenated hydrocarbons and ethers are preferable, and methylene chloride and tetrahydrofuran are more preferable.
The amount of the solvent used is not particularly limited, and may be greater than the amount of the compound represented by Formula [23] by a factor of 1 to 1,000 (v/w).
Examples of the base used in this reaction include an inorganic base and an organic base. As the base, sodium hydrogen carbonate, sodium carbonate, potassium carbonate, and N-methylimidazole are preferable, and sodium hydrogen carbonate and sodium carbonate are more preferable.
The amount of the base used may be greater than the amount of the compound represented by Formula [23], by a factor of 1 to 50 in terms of mole, and is preferably greater than the amount of the compound by a factor of 1 to 10 in terms of mole.
The amount of the compound represented by Formula [24] used is not particularly limited. The amount may be greater than the amount of the compound represented by Formula [23] by a factor of 1 to 50 in terms of mole, and is preferably greater than the amount of the compound by a factor of 1 to 10 in terms of mole.
The reaction temperature may be −30° C. to 100° C., and is preferably 0° C. to 50° C.
The reaction time is preferably 1 minute to 72 hours.
In a case where R1 is a hydrogen atom, the compound represented by formula [22] is a compound represented by Formula [27].
(In the formulae, Ra, R2, and L1 have the same definition as Ra, R2, and L1 described above.)
As the compound represented by Formula [25], for example, 5-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanoic acid is known.
As the compound represented by Formula [26], for example, (S)-tert-butyl 3-amino-2-(((benzyloxy)carbonyl)amino)propanoate is known.
By performing a reaction between the compound represented by Formula [25] and the compound represented by Formula [26] in the presence of a condensing agent and in the presence or absence of a base, the compound represented by Formula [27] can be manufactured.
This reaction may be performed based on (1) of Manufacturing method 1.
In a case where R1 is an amino-protecting group, the compound represented by Formula [22] is a compound represented by Formula [31].
(In the formulae, Rb represents a carboxyl-protecting group, Rc represents an amino-protecting group, and Ra, R2, and L1 have the same definition as Ra, R2, and L1 described above.)
As the compound represented by Formula [28], for example, ethyl 5-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanoate and methyl 5-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanoate are known.
The compound represented by Formula [31] can be manufactured from the compound represented by Formula [28].
(1)
By protecting an amino group of a 1,2,3,4-tetrahydro-1,8-naphthyridinyl group of the compound represented by Formula [28], the compound represented by Formula [29] can be manufactured.
Rc is preferably a C1-6 alkoxycarbonyl group which may be substituted, a heterocyclic sulfonyl group which may be substituted, or an arylsulfonyl group which may be substituted, more preferably a C1-6 alkoxycarbonyl group which may be substituted with one or more substituents selected from the substituent group A, a heterocyclic sulfonyl group which may be substituted with one or more substituents selected from the substituent group A, or an arylsulfonyl group which may be substituted with one or more substituents selected from the substituent group A, and even more preferably a C1-6 alkoxycarbonyl group, a 2,2,4,6,7-pentamethyldihydrobenzofuran-5-sulfonyl group, or a 2,2,5,7,8-pentamethylchromane-6-sulfonyl group.
In a case where Rc is a 2,2,4,6,7-pentamethyldihydrobenzofuran-5-sulfonyl group or a 2,2,5,7,8-pentamethylchromane-6-sulfonyl group. Rc can be selectively deprotected.
(2)
By deprotecting the protecting group Rb of the compound represented by Formula [29], a compound represented by Formula [30] can be manufactured.
This reaction may be performed based on (2) of Manufacturing method 1, under the conditions in which the protecting group Rc is not simultaneously deprotected. For example, in a case where the protecting group Rc is a C1-6 alkoxycarbonyl group, a C1-6 alkylsulfonyl group, an arylsulfonyl group, or a heterocyclic sulfonyl group, the compound represented by Formula [30] can be manufactured by alkaline hydrolysis.
(3)
By performing a reaction between the compound represented by Formula [30] and the compound represented by Formula [26] in the presence of a condensing agent and in the presence or absence of a base, the compound represented by Formula [31] can be manufactured.
This reaction may be performed based on (1) of Manufacturing method 1.
As another method, by protecting an amino group of the compound represented by Formula [27], the compound represented by Formula [31] can be manufactured.
This reaction may be performed based on (1) of Manufacturing method Ab.
(In the formulae, Rd represents a hydroxyl group or a leaving group; Re represents an amino-protecting group: Rf represents an amino-protecting group: and L3, A1, and m have the same definition as L3, A1, and m described above.)
As the compound represented by Formula [32], for example, benzyl (2-aminoethyl)carbamate is known.
As the compound represented by Formula [33], for example, (R)-2-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-3-sulfopropanoic acid is known.
(1)
By performing a reaction between the compound represented by Formula [32] and the compound represented by Formula [33] in the presence of a base, the compound represented by Formula [34] can be manufactured.
This reaction may be performed based on (1) of Manufacturing method 1.
(2)
The compound represented by Formula [35] can be manufactured by deprotecting the protecting group Re of the compound represented by Formula [34].
This reaction may be performed based on (2) of Manufacturing method 1.
In a case where m is 2 or 3, by repeating an operation of reacting the compound represented by Formula [34] with the compound represented by Formula [33] and then deprotecting the protecting group Re, the compound represented by Formula [35] can be manufactured.
(3)
The compound represented by Formula [36] is a compound known as a bifunctional chelate.
As the compound represented by Formula [36], for example, 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic tri-tert-butyl ester (DOTA) having a protected carboxyl group and ((R)-4-(4,7-bis(2-(tert-butoxy)-2-oxoethyl)-1,4,7-triazonan-1-yl)-5-(tert-butoxy)-5-oxopentanoic acid (NODAGA) having a protected carboxyl group are known.
In a case where Rd in Formula [36] is a hydroxyl group, by performing a reaction between the compound represented by Formula [35] and the compound represented by Formula [36] in the presence of a condensing agent and in the presence or absence of a base, the compound represented by Formula [37] can be manufactured.
In a case where Rd in Formula [36] is an active ester of a succinimide oxide group or the like, by performing a reaction between the compound represented by Formula [35] and the compound represented by Formula [36] in the presence or absence of a base, the compound represented by Formula [37] can be manufactured.
This reaction may be performed based on (1) of Manufacturing method 1.
(4)
By deprotecting the protecting group Rf of the compound represented by Formula [37], the compound represented by Formula [3] can be manufactured.
This reaction may be performed based on (2) of Manufacturing method 1.
By being subjected to a known reaction such as condensation, addition, oxidation, reduction, transposition, substitution, halogenation, dehydration, or hydrolysis or by being subjected to a reaction performed by appropriately combining the above reactions, the compounds obtained by the aforementioned manufacturing methods can be induced into other compounds.
The compounds obtained by the aforementioned manufacturing methods can be isolated and purified by a general method such as extraction, crystallization, distillation, or column chromatography. Furthermore, the compounds obtained by the aforementioned manufacturing methods may be used as they are for the next reaction without being isolated.
In a case where an amino, hydroxyl, or carboxyl group is present in the compounds obtained by the aforementioned manufacturing methods and intermediates thereof, the reaction can be performed by appropriately recombining the protecting groups of these. In a case where there are two or more protecting groups, the protecting groups can be selectively deprotected by being subjected to a known reaction.
Among the compounds used in the aforementioned manufacturing methods, the compound that can take a salt form can be used as a salt.
In a case where the compounds used in the aforementioned manufacturing methods have isomers (for example, an optical isomer, a geometric isomer, and a tautomer), these isomers can also be used. Furthermore, in a case where there are a solvate, a hydrate, and crystals of various shapes, these solvate, hydrate, and crystals of various shapes can also be used.
Next, the present invention will be more specifically described based on reference examples and examples, but the present invention is not limited thereto.
Unless otherwise specified, as a carrier for silica gel column chromatography, 63 to 210 μm of silica gel 60N (spherical/neutral) (manufactured by KANTO KAGAKU) was used.
The mixing ratio in an eluent is a volume ratio.
For example, “hexane/ethyl acetate=90/10 to 50/50” means that an eluent of “hexane:ethyl acetate=90:10” was changed to an eluent of “hexane:ethyl acetate=50:50”.
1H-NMR spectra were measured using Bruker A V300 (manufactured by Bruker) or JEOL JNM-AL400 model (JEOL) by using tetramethylsilane as internal standard, and δ values were described using ppm.
Unless otherwise specified, HPLC analysis was performed using Nexera HPLC System (Shimadzu Corporation) (column: TSKgel ODS-100Z (Tosoh Corporation), 4.6×150 mm, column: GL Intertsustain C18 (GL Sciences Inc.), 4.6×150 mm, or column: Waters BEH C18 (WATERS), 2.1×100 mm), solvent: (formic acid-based) A solution=formic acid:water (1:1000), B solution=formic acid:methanol:acetonitrile (1:800:200), (ammonium acetate-based) A solution=5 mM aqueous ammonium acetate solution, B solution=5 mM aqueous ammonium acetate solution:methanol:acetonitrile (5:36:9) or (TFA-based) A solution=TFA:water:acetonitrile (1:900:100), B solution=TFA:water:acetonitrile (1:100:900), gradient cycle: 0 min (A solution/B solution=90/10), 30 min (A solution/B solution=0/100), flow rate: 1.0 mL/min). The retention time (min) was described using rt (min). In a case where the analysis conditions are different, the conditions are described in reference examples or examples.
Unless otherwise specified, the preparative HPLC was performed using Waters 600E system (Waters) (column:SunFire PrepC180BD 30×150 mm (Waters) or SunFire PrepC180BD 19×150 mm (Waters), solvent: A solution=formic acid:water (1:1,000), B solution=formic acid:methanol:acetonitrile (1:800:200) or a solvent:A solution=10 mM aqueous ammonium acetate solution, B solution=10 mM aqueous ammonium acetate solution:methanol:acetonitrile (10:800:200)).
Unless otherwise specified, for TLC analysis, silica gel 60F254 (Merck) or RP-18F254 (Merck) was used.
The MS and LC/MS analyses were performed using an ACQUITY SQD LC/MS System (Waters) (column: BEHC18 2.1×30 mm (Waters), A solution=0.1% formic acid/water, B solution=0.1% formic acid/acetonitrile, gradient cycle: 0 min (A solution/B solution=95/5), 2 min (A solution/B solution=5/95), 3 min (A solution/B solution=5/95), flow rate: 0.5 mL/min). The retention time (min) was described using rt (min), and ESI positive and negative ion peaks were detected.
Each abbreviation means the following.
HBTU (67.9 g) was added in 5 divided portions at an interval of 10 minutes to a DMAc solution (500 mL) of 5-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanoic acid (41.9 g), (S)-tert-butyl 3-amino-2-(((benzyloxy)carbonyl)amino)propanoate (50.0 g), and DIEA (57.8 mL), followed by stirring for 2 hours at room temperature. An aqueous saturated sodium hydrogen carbonate solution (50 mL) was added thereto, followed by stirring for 10 minutes. Then, an aqueous saturated sodium hydrogen carbonate solution (200 mL) was further added thereto, followed by stirring for 30 minutes. Ethyl acetate (300 Ml) was added thereto, followed by stirring for 10 minutes. Thereafter, insoluble matter was removed by filtration, and the resultant was washed twice with ethyl acetate (100 mL). The organic layer was washed twice with an aqueous saturated sodium hydrogen carbonate solution (250 mL) and then twice with an aqueous saturated sodium chloride solution (100 mL). The organic layer was dried over anhydrous sodium sulfate, and the solvent was distilled away under reduced pressure. Ethyl acetate (300 mL) and hexane (170 mL) were added to the obtained residue, and the solution was stirred overnight so as to precipitate a solid. Hexane (430 mL) was then added thereto, followed by stirring for 2 hours at room temperature. The solid was collected by filtration, thereby obtaining (S)-tert-butyl 2-(((benzyloxy)carbonyl)amino)-3-(5-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propanoate (69.0 g) as a light yellow solid.
MS (ESI, m/z): 511 [M+H]+
1H-NMR (CDCl3) δ: 7.38-7.27 (5H, m), 7.05 (1H, d, J=7.3 Hz), 6.33 (1H, d, J=7.3 Hz), 6.15-6.03 (2H, m), 6.01 (2H, brd, J=5.9 Hz), 5.10 (2H, s), 4.95-4.82 (1H, m), 4.31 (1H, dt, J=5.9 Hz, 5.9 Hz), 3.64 (2H, t, J=5.9 Hz), 3.42-3.31 (2H, m), 2.67 (2H, t, J=6.3 Hz), 2.58-2.46 (2H, m), 2.23-2.11 (2H, m), 1.99-1.81 (2H, m), 1.73-1.59 (4H, m), 1.45 (9H, s)
HPCL (TSKgel ODS-100Z, formic acid-based) rt (min): 15.69
Methanol (25 mL) and 10% palladium on carbon (0.250 g) were added to (S)-tert-butyl 2-(((benzyloxy)carbonyl)amino)-3-(5-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propanoate (5.00 g), followed by stirring for 1 hour in a hydrogen atmosphere at 0.4 MPa. The insoluble matter was removed by filtration, and methanol was distilled away under reduced pressure. An operation of adding acetonitrile (10 ml) to the residue and distilling away the solvent under reduced pressure was repeated twice, thereby obtaining (S)-tert-butyl 2-amino-3-(5-(5,6,7,8-terrahydro-1,8-naphthyridin-2-yl)pentanamide)propanoate (3.83 g) as a light yellow oily substance.
MS (ESI, m/z): 377 [M+H]+
1H-NMR (CDCl3) δ: 7.04 (d, J=7.3 Hz, 1H), 6.33 (d, J=7.3 Hz, 1H), 6.26-6.13 (m, 1H), 5.01-4.88 (m, 1H), 3.70-3.57 (m, 1H), 3.51-3.44 (m, 1H), 3.43-3.35 (m, 2H), 3.32-3.20 (m, 1H), 2.73-2.63 (m, 2H), 2.60-2.50 (m, 2H), 2.26-2.15 (m, 2H), 1.96-1.84 (m, 2H), 1.80-1.61 (m, 6H), 1.46 (s, 9H) HPCL (TSKgel ODS-100Z, formic acid-based) rt (min): 21.41
4-(4-(chlorosulfonyl)-3,5-dimethylphenoxy)butanoic acid (0.670 g) was added to a methylene chloride (20 mL) suspension of (S)-tert-butyl 2-amino-3-(5-(5,6,7,8-terrahydro-1,8-naphthyridin-2-yl)pentanamide)propanoate (1.99 g) and sodium hydrogen carbonate (1.23 g) with ice cooling, followed by stirring for 30 minutes. Then, 4-(4-(chlorosulfonyl)-3,5-dimethylphenoxy)butanoic acid (0.340 g) was added thereto, followed by stirring for 30 minutes. Thereafter, 4-(4-(chlorosulfonyl)-3,5-dimethylphenoxy)butanoic acid (0.340 g) was further added thereto, followed by stirring for 1 hour. The solution was stirred for 14 hours at room temperature, and the solvent was distilled away under reduced pressure. Ethyl acetate (30 mL) and water (30 mL) were added to the obtained residue, the solution was stirred, and sodium carbonate (3.0 g) was added thereto so as to adjust the pH to be 9.6. Liquid separation was performed by adding water (50 mL) and ethyl acetate (50 mL), and the aqueous layer was washed with ethyl acetate (40 mL). Acetonitrile (80 mL) and ammonium chloride (30 g) were added to the aqueous layer, followed by stirring. Then, the organic layer was separated, the aqueous layer was extracted using acetonitrile (40 mL), and the entirety of the organic layer was dried over anhydrous sodium sulfate. The solvent was distilled away under reduced pressure, thereby obtaining (S)-4-(4-(N-(1-(tert-butoxy)-1-oxo-3-(5-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propan-2-yl)sulfamoyl)-3,5-dimethylphenoxy)butanoic acid (2.58 g) as a yellow amorphous solid.
MS (ESI, m/z): 647 [M+H]+
1H-NMR (CDCl3) δ: 7.24 (1H, d, J=7.3 Hz), 6.67 (2H, s), 6.27 (1H, d, J=7.3 Hz), 6.08-5.86 (1H, m), 5.85-5.62 (1H, m), 4.17-3.99 (2H, m), 3.93-3.83 (1H, m), 3.58-3.25 (4H, m), 2.80-2.56 (11H, m), 2.54-2.42 (2H, m), 2.19-2.05 (2H, m), 2.01-1.76 (4H, m), 1.73-1.45 (4H, m), 1.40 (9H, s) HPCL (TSKgel ODS-100Z, formic acid-based) rt (min): 15.90
(BOC)2O (3.1 mL) was added to a mixture of (S)-tert-butyl 2-(((benzyloxy)carbonyl)amino)-3-(5-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propanoate (2.3 g), THF (25 mL), and DIEA (2.4 mL), and the mixture was heated for 8 hours under reflux. The solvent was distilled away under reduced pressure, and the resultant was purified by silica gel column chromatography (hexane/ethyl acetate=1/1), thereby obtaining (S)-tert-butyl 7-(5-((2-(((benzyloxy)carbonyl)amino)-3-(tert-butoxy)-3-oxopropyl)amino)-5-oxopentyl)-3,4-dihydro-1,8-naphthyridin-1(2H)-carboxylate (1.86 g) as a light yellow oily substance.
LC/MS rt (min): 1.37
MS (ESI, m/z): 611.4 [M+H]+
(S)-tert-butyl 7-(5-((2-(((benzyloxy)carbonyl)amino)-3-(tert-butoxy)-3-oxopropyl)amino)-5-oxopentyl)-3,4-dihydro-1,8-naphthyridin-1(2H)-carboxylate (750 mg), 10% palladium on carbon (0.13 g), and methanol (30 mL) were put into a stainless steel tube and stirred for 4 hours in a nitrogen atmosphere at 0.5 MPa. The insoluble matter was removed by filtration, and the solvent was distilled away under reduced pressure, thereby obtaining (S)-tert-butyl 7-(5-((2-amino-3-(tert-butoxy)-3-oxopropyl)amino)-5-oxopentyl)-3,4-dihydro-1,8-naphthyridin-1(2H)-carboxylate (617 mg) as a light yellow oily substance.
LC/MS rt (min): 0.79
MS (ESI, m/z): 477.3 [M+H]+
N-methylimidazole (0.5 mL) and 4-(4-(chlorosulfonyl)-3,5-dimethylphenoxy)butanoic acid (1.8 g) were added at 0° C. to a THF (10 mL) solution of (S)-tert-butyl 7-(5-((2-amino-3-(tert-butoxy)-3-oxopropyl)amino)-5-oxopentyl)-3,4-dihydro-1,8-naphthyridin-1(2H)-carboxylate (2.8 g), the mixture was stirred for 3 hours at 0° C., and the solvent was distilled away under reduced pressure. Ethyl acetate (30 mL) and water (30 mL) were added to the obtained residue, and the organic layer was fractionated, washed with an aqueous saturated sodium chloride solution (30 mL), and then dried over anhydrous sodium sulfate. The solvent was distilled away under reduced pressure, and the resultant was purified by silica gel column chromatography (diol silica (CHROMATOREX-DIOL, FUJI SILYSIA CHEMICAL LTD), hexane/ethyl acetate=55/45 to 20/80), thereby obtaining (S)-4-(4-(N-(1-(tert-butoxy)-3-(5-(8-(tert-butoxycarbonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)-1-oxopropan-2-yl)sulfamoyl)-3,5-dimethylphenoxy)butanoic acid (1.58 g) as a yellow amorphous solid.
LC/MS rt (min): 1.23
MS (ESI, m/z): 747.4 [M+H]+
1H-NMR (CDCl3) δ: 7.33 (1H, d, J=7.9 Hz), 6.84 (1H, d, J=7.9 Hz), 6.63 (2H, s), 5.75 (1H, t, J=5.6 Hz), 5.64 (1H, d, J=7.3 Hz), 4.17-3.97 (3H, m), 3.86-3.65 (3H, m), 3.54-3.28 (2H, m), 2.77-2.68 (4H, m), 2.62 (6H, s), 2.51 (2H, t, J=6.6 Hz), 2.15-1.86 (6H, m), 1.74-1.47 (6H, m), 1.50 (9H, s), 1.37 (9H, s)
2,2,5,7,8-pentamethylchroman-6-yl)sulfonyl chloride (3.02 g) was added to a mixture of methyl 5-(5,6,7,8-tetrahydro-1,8-naphthyridine-2-yl)pentanoate (2.00 g), potassium carbonate (1.66 g), and acetonitrile (12 mL), followed by stirring for 1.5 hours at 70° C. By adding ethyl acetate (20 mL) and water (30 mL) thereto, the organic layer was fractionated. Thereafter, the organic layer was washed once with an aqueous saturated sodium hydrogen carbonate solution (20 mL) and then twice with an aqueous saturated sodium chloride solution (20 mL) and dried over anhydrous sodium sulfate, and the solvent was distilled away under reduced pressure. The obtained residue was purified by silica gel column chromatography (hexane/ethyl acetate=90/10 to 75/25), thereby obtaining methyl 5-(8-((2,2,5,7,8-pentamethylchroman-6-yl)sulfonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanoate (2.87 g) as a light yellow foamy substance.
LC/MS rt (min): 2.06
MS (ESI, m/z): 515.5 [M+H]+
A 2.5 M aqueous sodium hydroxide solution (3 mL) and methanol (5 mL) were added to a mixture of methyl 5-(8-((2,2,5,7,8-pentamethylchroman-6-yl)sulfonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanoate (1.94 g), THF (10 mL), and water (1 mL), followed by stirring for 3 hours at room temperature. The solvent was distilled away under reduced pressure, and water (15 mL) and sodium hydrogen sulfate were added thereto so as to adjust the pH to be 4. By adding ethyl acetate (15 mL), the organic layer was fractionated. The organic layer was then washed with water (20 mL) and an aqueous saturated sodium chloride solution (20 mL) and dried over anhydrous sodium sulfate. The solvent was distilled away under reduced pressure, thereby obtaining 5-(8-((2,2,5,7,8-pentamethylchroman-6-yl)sulfonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanoic acid (2.00 g) as a colorless foamy substance.
LC/MS rt (min): 1.78
MS (ESI, m/z): 501.4 [M+H]+
1H-NMR (CDCl3) δ: 7.18 (1H, d, J=7.2 Hz), 6.55 (1H, d, J=7.1 Hz), 4.06-4.09 (2H, m), 2.75 (2H, t, J=6.6 Hz), 2.64 (2H, t, J=6.6 Hz), 2.59 (s, 3H), 2.53 (s, 3H), 2.35 (2H, t, J=7.2 Hz), 2.16 (2H, t, J=7.2 Hz), 2.12 (3H, s), 2.02-2.08 (2H, m), 1.81 (2H, t, J=7.2 Hz), 1.33-1.47 (2H, m), 1.14-1.26 (2H, m)
HBTU (1.22 g) was added to a DMF (8 mL) solution of 5-(8-((2,2,5,7,8-pentamethylchroman-6-yl)sulfonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanoic acid (1.47 g), (S)-tert-butyl 3-amino-2-(((benzyloxy)carbonyl)amino)propanoate (951 mg) and DIEA (1.13 mL), followed by stirring for 30 minutes at room temperature. Water (30 mL) and ethyl acetate (30 mL) were added thereto, followed by stirring. The organic layer was fractionated, sequentially washed with a 5% aqueous citric acid solution (15 mL), water (15 mL), an aqueous saturated sodium chloride solution (15 mL), an aqueous saturated sodium hydrogen carbonate solution (15 mL), and an aqueous saturated sodium chloride solution (15 mL), and dried over anhydrous sodium sulfate, and the solvent was distilled away under reduced pressure. The residue was purified by silica gel column chromatography (hexane/ethyl acetate=60/40 to 30/70), thereby obtaining (S)-tert-butyl 2-(((benzyloxy)carbonyl)amino)-3-(5-(8-((2,2,5,7,8-pentamethylchroman-6-yl)sulfonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propanoate (2.16 g) as a colorless foamy substance.
LC/MS rt (min): 2.08
MS (ESI, m/z): 777.7 [M+H]+
2,2,5,7,8-pentamethylchroman-6-yl)sulfonyl chloride (0.712 g) was added to a mixed solution of (S)-tert-butyl 2-(((benzyloxy)carbonyl)amino)-3-(5-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propanoate (1.0 g), potassium carbonate (0.677 g), and acetonitrile (5.6 mL) at room temperature, followed by stirring for 1 hour at room temperature, and the solution was heated for 3 hours under reflux. The temperature of the reaction solution was returned to room temperature, water (10 mL) was added thereto, and extraction was performed using ethyl acetate. The organic layer was washed with an aqueous saturated sodium chloride solution, and dried over anhydrous sodium sulfate, and the solvent was distilled away under reduced pressure. The obtained residue was purified by silica gel column chromatography (hexane/ethyl acetate), thereby obtaining (S)-tert-butyl 2-(((benzyloxy)carbonyl)amino)-3-(5-(8-((2,2,5,7,8-pentamethylchroman-6-yl)sulfonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propanoate (0.500 g) as a white solid.
LC/MS rt (min): 2.08
MS (ESI, m/z): 777.7 [M+H]+
1H-NMR (CDCl3) δ: 7.37-7.29 (m, 4H), 7.15 (d, 1H, J=7.9 Hz), 6.53 (d, 1H, J=7.9 Hz), 5.99-5.90 (m, 1H), 5.79-5.71 (m, 1H), 5.09 (s, 2H), 4.34-4.22 (m, 1H), 4.11-4.02 (m, 2H), 3.72-3.50 (m, 2H), 2.73 (t, 2H, J=6.3 Hz), 2.63 (t, 2H, J=6.6 Hz), 2.56 (s, 3H), 2.53 (s, 3H), 2.31 (t, 2H, J=7.3 Hz), 2.13-1.90 (m, 5H), 1.79 (t, 2H, J=6.9 Hz), 1.58-1.50 (m, 8H), 1.48-1.35 (m, 8H), 1.33-1.15 (m, 6H)
A methanol (14 mL) solution of (S)-tert-butyl 2-(((benzyloxy)carbonyl)amino)-3-(5-(8-((2,2,5,7,8-pentamethylchroman-6-yl)sulfonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propanoate (0.500 g) was allowed to flow through a flow-type hydrogenation reactor (H-Cube, ThalesNano Inc.) equipped with a 10% palladium-on-carbon cartridge, and the solvent was distilled away under reduced pressure, thereby obtaining (S)-tert-butyl 2-amino-3-(5-(8-((2,2,5,7,8-pentamethylchroman-6-yl)sulfonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propanoate (0.309 g) as a light yellow solid.
LC/MS rt (min): 1.45
MS (ESI, m/z): 643.6 [M+H]+
1H-NMR (CDCl3) a: 7.16 (d, 1H, J=7.9 Hz), 6.54 (d, 1H, J=7.9 Hz), 6.09-5.98 (m, 1H), 4.12-4.02 (m, 2H), 3.67-3.56 (m, 1H), 3.49-3.42 (m, 1H), 3.30-3.18 (m, 1H), 2.74 (t, 2H, J=6.3 Hz), 2.64 (t, 2H, J=6.9 Hz), 2.57 (s, 3H), 2.54 (s, 3H), 2.33 (t, 2H, J=7.3 Hz), 2.14-1.97 (m, 6H), 1.90-1.68 (m, 4H), 1.51-1.37 (m, 11H), 1.34-1.16 (m, 9H)
4-(4-(chlorosulfonyl)-3,5-dimethylphenoxy)butanoic acid (57.4 mg) was added to a mixed solution of (S)-tert-butyl 2-amino-3-(5-(8-((2,2,5,7,8-pentamethylchroman-6-yl)sulfonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propanoate (100 mg), sodium hydrogen carbonate (39.3 mg), and N,N-dimethylacetamide (1.6 mL), followed by stirring for 27 hours at room temperature, thereby obtaining a reaction mixture containing (S)-4-(4-(N-(1-(tert-butoxy)-1-oxo-3-(5-(8-((2,2,5,7,8-pentamethylchroman-6-yl)sulfonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propan-2-yl)sulfamoyl)-3,5-dimethylphenoxy)butanoic acid.
Acetonitrile (8 mL) was added to a mixture of methyl 5-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanoate (1.04 g), 2,2,4,6,7-pentamethyl-2,3-dihydrobenzofuran-5-yl)sulfonyl chloride (1.33 g), and potassium carbonate (870 mg), followed by stirring for 8 hours at 70° C. By adding ethyl acetate (20 mL) and water (30 mL) thereto, the organic layer was fractionated. The organic layer was then washed with an aqueous saturated sodium hydrogen carbonate solution (30 mL) and dried over anhydrous sodium sulfate, and the solvent was distilled away under reduced pressure. The obtained reside was purified by silica gel column chromatography (hexane/ethyl acetate=85/15 to 65/35) and then recrystallized from IPA/hexane, thereby obtaining methyl 5-(8-((2,2,4,6,7-pentamethyl-2,3-dihydrobenzofuran-5-yl)sulfonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanoate (1.18 g) as a white solid.
LC/MS rt (min): 1.96
MS (ESI, m/z): 501.4 [M+H]+
1H-NMR (CDCl3) δ: 7.19 (1H, d, J=8.1 Hz), 6.56 (1H, d, J=8.1 Hz), 4.06-4.13 (2H, m), 3.64 (3H, s), 2.98 (2H, s), 2.75 (2H, t, J=7.2 Hz), 2.56 (3H, s), 2.50 (3H, s), 2.37 (2H, t, J=7.2 Hz), 2.16 (2H, t, J=7.5 Hz), 2.08 (3H, s), 2.01-2.05 (2H, m), 1.22-1.32 (2H, m)
A 2.5 M aqueous sodium hydroxide solution (1.2 mL) was added to a mixture of methyl 5-(8-((2,2,4,6,7-pentamethyl-2,3-dihydrobenzofuran-5-yl)sulfonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanoate (499 mg), THF (5 mL), water (0.3 mL), and MeOH (2.5 mL), followed by stirring for 7 hours at room temperature. Water (25 mL) and sodium hydrogen sulfate were added to the reaction mixture until the pH became 4, ethyl acetate was further added thereto (30 mL), and the organic layer was fractionated. The obtained organic layer was washed twice with water (20 mL) and then with once with an aqueous saturated sodium chloride solution (20 mL) and dried over anhydrous sodium sulfate. Thereafter, the solvent was distilled away under reduced pressure, thereby obtaining 5-(8-((2,2,4,6,7-pentamethyl-2,3-dihydrobenzofuran-5-yl)sulfonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanoic acid (501 mg) as a colorless foamy substance.
LC/MS rt (min): 1.49
MS (ESI, m/z): 487.4 [M+H]+
(1-A-3)
HBTU (436 mg) was added to a DMF (4 mL) solution of 5-(8-((2,2,4,6,7-pentamethyl-2,3-dihydrobenzofuran-5-yl)sulfonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanoic acid (501 mg), (S)-tert-butyl 3-amino-2-(((benzyloxy)carbonyl)amino)propanoate (294 mg), and DIEA (0.42 mL), followed by stirring for 30 minutes at room temperature. An aqueous saturated ammonium chloride solution (20 mL) and ethyl acetate (30 mL) were added thereto, followed by stirring. Thereafter, the organic layer was fractionated, sequentially washed with water (20 mL) and an aqueous saturated sodium chloride solution (20 mL), and dried over anhydrous magnesium sulfate, and then the solvent was distilled away under reduced pressure. The residue was purified by silica gel column chromatography (hexane/ethyl acetate=60/40 to 30/70), thereby obtaining (S)-tert-butyl 2-(((benzyloxy)carbonyl)amino)-3-(5-(8-((2,2,4,6,7-pentamethyl-2,3-dihydrobenzofuran-5-yl)sulfonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propanoate (768 mg) as a colorless foamy substance.
LC/MS rt (min): 2.01
MS (ESI, m/z): 763.6 [M+H]+
By using (S)-tert-butyl 2-(((benzyloxy)carbonyl)amino)-3-(5-(−5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propanoate (1.0 g), (S)-tert-butyl 2-(((benzyloxy)carbonyl)amino)-3-(5-(8-((2,2,4,6,7-pentamethyl-2,3-dihydrobenzofuran-5-yl)sulfonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propanoate (136 mg) as a light yellow solid by the same method as described in (1-B) of Reference Example 3.
LC/MS rt (min): 2.01
MS (ESI, m/z): 763.7 [M+H]+
1H-NMR (CDCl3) δ: 7.37-7.29 (m, 4H), 7.16 (d, 1H, J=7.3 Hz), 6.54 (d, 1H, J=7.3 Hz), 5.98-5.89 (m, 1H), 5.78-5.69 (m, 1H), 5.10 (s, 2H), 4.34-4.24 (m, 1H), 4.10-4.04 (m, 2H), 3.71-3.52 (m, 2H), 2.97 (s, 2H), 2.73 (t, 2H, J=6.3 Hz), 2.55 (s, 3H), 2.49 (s, 3H), 2.35 (t, 2H, J=7.6 Hz), 2.10-1.92 (m, 5H), 1.58-1.50 (m, 5H), 1.49-1.35 (m, 15H), 1.33-1.21 (m, 2H)
(S)-tert-butyl 2-(((benzyloxy)carbonyl)amino)-3-(5-(8-((2,2,4,6,7-pentamethyl-2,3-dihydrobenzofuran-5-yl)sulfonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propanoate (150 mg), methanol (3 mL), and 10% palladium on carbon (30 mg) were put into an autoclave, and stirred for 2.5 hours at room temperature in a nitrogen atmosphere at 0.9 MPa. Hydrogen was added thereto, followed by stirring for 3 hours at room temperature in a nitrogen atmosphere at 0.9 MPa. The insoluble matter was removed by filtration, and the solvent was distilled away under reduced pressure, thereby obtaining (S)-tert-butyl 2-amino-3-(5-(8-((2,2,4,6,7-pentamethyl-2,3-dihydrobenzofuran-5-yl)sulfonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propanoate (130 mg) as a black oily substance.
LC/MS rt (min): 1.51
MS (ESI, m/z): 629 [M+H]+
1H-NMR (CDCl3, 300 MHz) δ: 7.17 (1H, d, J=7.3 Hz), 6.55 (1H, d, J=7.3 Hz), 6.01-5.94 (1H, m), 4.11-4.04 (2H, m), 3.66-3.56 (1H, m), 3.51-3.39 (1H, m), 3.28-3.18 (1H, m), 2.98 (2H, s), 2.74 (2H, t, J=6.3 Hz), 2.56 (3H, s), 2.50 (3H, s), 2.36 (2H, t, J=7.3 Hz), 2.10-1.97 (7H, m), 1.60-1.52 (4H, m), 1.46 (15H, s), 1.34-1.22 (2H, m)
4-(4-(chlorosulfonyl)-3,5-dimethylphenoxy)butanoic acid (58 mg) was added to a mixture of (S)-tert-butyl 2-amino-3-(5-(8-((2,2,4,6,7-pentamethyl-2,3-dihydrobenzofuran-5-yl)sulfonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propanoate (99 mg), DMAc (1 mL), and sodium hydrogen carbonate (40 mg), followed by stirring for 15 hours at room temperature, thereby obtaining a reaction mixture containing (S)-4-(4-(N-(1-(tert-butoxy)-1-oxo-3-(5-(8-((2,2,4,6,7-pentamethyl-2,3-dihydrobenzofuran-5-yl)sulfonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propan-2-yl)sulfamoyl)-3,5-dimethylphenoxy)butanoic acid.
LC/MS rt (min): 1.86
MS (ESI, m/z): 899.4 [M+H]+
Sodium hydrogen carbonate (50 g) was added to an aqueous solution (400 mL) of L-cysteic acid (50 g), followed by stirring. An acetone solution (800 mL) of 9-fluorenylmethyl N-succinimidyl carbonate (109.7 g) was added dropwise to the above solution for 25 minutes, followed by stirring for 7 hours at room temperature. Acetone (400 mL) was added thereto, and the solid was collected by filtration and washed three times with acetone (100 mL). The solid was dissolved in water (600 mL) and heated to 50° C. Then, methanol (1,200 mL) was added thereto with stirring, and water (200 mL) and methanol (400 mL) were further added thereto, followed by stirring for 2 hours at room temperature. The solid was collected by filtration and washed three times with hydrous methanol (methanol:water=2:1, 100 mL), thereby obtaining disodium (R)-2-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-3-sulfopropanoate (93.5 g) as a white solid.
LC/MS rt (min): 1.01
MS (ESI, m/z): 390.1 [free from M−H]−
1H-NMR (300 MHz, D2O) δ: 7.82 (d, 2H, J=7.2 Hz), 7.66 (d, 2H, J=7.8 Hz), 7.41 (t, 2H, J=7.8 Hz), 7.33 (t, 2H, J=7.2 Hz)
HPLC (TSKgel ODS-100Z, ammonium acetate-based) rt (min): 13.5
Methanesulfonic acid (46 g) was added dropwise to a DMAc (500 mL) suspension of disodium (R)-2-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-3-sulfopropanoate (87.1 g) for 5 minutes, followed by stirring for 40 minutes at room temperature. N-(benzyloxy)carbonyl-1,2-diaminoethane hydrochloride (51.2 g) was added thereto, followed by stirring for 30 minutes at room temperature. Then, DIEA (165 mL) and HBTU (83.5 g) were added thereto, followed by stirring for 1.5 hours at room temperature. Water (1 L) was added to the reaction solution, an aqueous potassium acetate solution (potassium acetate (196 g)/water (800 mL)) was added dropwise thereto with stirring. The reaction solution was stirred for 30 minutes at a temperature of 50° C. to 55° C., then cooled to room temperature, and stirred for 2 hours. The solid was collected by filtration and washed three times with ice water (300 mL). Acetone (2 L) was added to the obtained solid, followed by stirring for 1 hour at room temperature. Then, the solid was collected by filtration and washed three times with acetone (200 mL), thereby obtaining potassium (R)-2-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-3-((2-(((benzyloxy)carbonyl)amino)ethyl)amino)-3-oxopropane-1-sulfonate (106.7 g) as a white solid.
LC/MS rt (min): 1.22
MS (ESI, m/z): 566.2 [free from M−H]−
HPLC (TSKgel ODS-100Z, ammonium acetate-based) rt (min): 24.2
Diethylamine (85.5 mL) was added to a mixture of potassium (R)-2-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-3-((2-(((benzyloxy)carbonyl)amino)ethyl)amino)-3-oxopropane-1-sulfonate (50.0 g), water (100 mL), and acetonitrile (300 mL), followed by stirring for 7 hours at room temperature. The solvent was distilled away under reduced pressure, and an operation of adding acetonitrile (100 mL) and toluene (200 mL) to the residue and performing concentration under reduced pressure was carried out twice, thereby obtaining a white solid. Acetonitrile (750 mL) was added to the solid such that the solid was dissolved, and then the solid was collected by filtration, thereby obtaining (R)-2-amino-3-((2(((benzyloxy)carbonyl)amino)ethyl)amino)-3-oxopropane-1-sulfonate (38 g). The solid was dissolved in water (500 mL), the insoluble matter was removed by filtration, and then concentrated hydrochloric acid (15 mL) was added dropwise thereto at room temperature with stirring, followed by stirring for 3 hours at room temperature. The reaction mixture was cooled to 10° C. Thereafter, the solid was collected by filtration, washed three times with ice water (100 mL), and then dried, thereby obtaining (R)-2-amino-3-((2-(((benzyloxy)carbonyl)amino)ethyl)amino)-3-oxopropane-1-sulfonic acid (20.1 g) as a white solid.
LC/MS rt (min): 0.70
MS (ESI, m/z): 346.1 [M+H]+
HPLC (TSKgel ODS-100Z, formic acid-based) rt (min): 10.0
A mixture of (R)-2-amino-3-((2-(((benzyloxy)carbonyl)amino)ethyl)amino)-3-oxopropane-1-sulfonic acid (16.5 g), 2-(4,7,10-tris(2-(tert-butoxy)-2-oxoethyl)-1,4,7,10-tetraazacyclododecan-1-yl) acetic acid (24.8 g), DMAc (125 mL), and DIEA (18.9 mL) was stirred for 20 minutes at room temperature, and then HBTU (17.7 g) was added thereto in five divided portions at an interval of 10 minutes, followed by stirring for 1 hour at room temperature. An aqueous saturated sodium chloride solution (125 mL) and ethyl acetate (250 mL) were added to the reaction mixture, and then the organic acid was fractionated and washed twice with an aqueous saturated sodium chloride solution (125 mL) and then twice with an aqueous saturated sodium hydrogen carbonate solution (125 mL). The organic layer was dried over anhydrous sodium sulfate, and the solvent was distilled away under reduced pressure, thereby obtaining (R)-3-((2-(((benzyloxy)carbonyl)amino)ethyl)amino)-3-oxo-2-(2-(4,7,10-tris(2-(tert-butoxy)-2-oxoethyl)-1,4,7,10-tetraazacyclododecan-1-yl)acetamide)propane-1-sulfonic acid (47.6 g) as a colorless foamy substance.
LC/MS rt (min): 1.21
MS (ESI, m/z): 900.6 [M+H]+
HPLC (TSKgel ODS-100Z, formic acid-based) rt (min): 18.5
10% palladium on carbon (0.489 g) and a methanol (20 mL) solution of (R)-3-((2-(((benzyloxy)carbonyl)amino)ethyl)amino)-3-oxo-2-(2-(4,7,10-tris(2-(tert-butoxy)-2-oxoethyl)-1,4,7,10-tetraazacyclododecan-1-yl)acetamide)propane-1-sulfonic acid (2.05 g) were put into a stainless steel tube, followed by stirring for 5 hours at 30° C. in a nitrogen atmosphere at 0.5 MPa. The insoluble matter was removed by filtration, the solvent was distilled away under reduced pressure. Then, toluene (20 mL) was added thereto, and then the solvent was distilled away again under reduced pressure, thereby obtaining (R)-3-((2-aminoethyl)amino)-3-oxo-2-(2-(4,7,10-tris(2-tert-(butoxy)-2-oxoethyl)-1,4,7,10-tetraazacyclododecan-1-yl)acetamide)propane-1-sulfonic acid (1.47 g) as arose pink solid.
1H-NMR (CDCl3) δ: 8.58-8.35 (1H, m), 7.90-7.68 (1H, m), 4.73-4.59 (1H, m), 3.69-1.87 (33H, m), 1.49-1.34 (27H, m)
HPLC (TSKgel ODS-100Z) rt (min): 10.1
Methanesulfonic acid (43 μL) was added to a DMF (1 mL) suspension of disodium (R)-2-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-3-sulfopropanoate (130.6 mg), followed by stirring for 20 minutes at room temperature. Then, (R)-2-amino-3-((2-(((benzyloxy)carbonyl)amino)ethyl)amino)-3-oxopropane-2-sulfonic acid (103.6 mg), DIEA (230 μL), and HBTU (125 mg) were added thereto, followed by stirring for 20 minutes at room temperature. Water (0.4 mL) was added to the reaction solution, and a mixed solution of sodium acetate (sodium acetate (250 mg)/water (125 μL)/methanol (3 mL)) was added thereto with stirring, and IPA (9 mL) and methanol (2 mL) were further added thereto. The obtained solid was collected by filtration, washed three times with methanol (1 mL), and dried under reduced pressure, thereby obtaining disodium (9R,12R)-12-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-3,8,11-trioxo-1-phenyl-9-(sulfonatomethyl)-2-oxa-4,7,10-triazatridecane-13-sulfonate (213 mg) as a white solid.
LC/MS rt (min): 1.15
MS (ESI, m/z): 717.1 [free from M−H]−
Methanesulfonic acid (2.54 g) was added dropwise to a DMF (35.0 mL) suspension of disodium (R)-2-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-3-sulfopropanoate (5.22 g), followed by stirring at room temperature until a homogenous solution was obtained. (R)-2-amino-3-((2-(((benzyloxy)carbonyl)amino)ethyl)amino)-3-oxopropane-1-sulfonic acid (4.14 g), DIEA (9.2 mL), and HBTU (5.0 g) were added to the solution, followed by stirring for 1.5 hours at room temperature. Water (50.0 mL) was added to the reaction solution, followed by stirring for 30 minutes at room temperature, and then the insoluble matter was removed by filtration. An aqueous potassium acetate solution (potassium acetate (11.8 g)/water (40.0 mL)) was added to the filtrate at room temperature with stirring, followed by stirring for 1 hour, and then the solid was collected by filtration and washed with ice water (50.0 mL). Acetonitrile (200 mL) was added to the solid, followed by stirring for 1 hour at 60° C. Then, the solid was cooled to 35° C. and collected by filtration, thereby obtaining dipotassium (9R,12R)-12-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-3,8,11-trioxo-1-phenyl-9-(sulfonatomethyl)-2-oxa-4,7,10-triazatridecane-13-sulfonate (8.71 g) as a white solid.
LC/MS rt (min): 1.15
MS (ESI, m/z): 717.2 [free from M−H]−
1H-NMR (300 MHz, DMSO) δ: 8.42 (d, 1H, J=6.6 Hz), 7.95 (1H, br), 7.89 (2H, d, J=7.2 Hz), 7.70 (2H, t, J=6.6 Hz), 7.52 (1H, d, J=5.7 Hz), 7.41 (2H, d, J=7.2 Hz), 7.25-7.35 (7H, m), 7.10 (1H, br), 4.90-5.01 (2H, m), 4.25 (3H, s), 4.16-4.30 (1H, m), 2.79-3.13 (8H, m)
Diethylamine (1 mL) was added to an suspension water (1.4 mL) and acetonitrile (4.2 mL) of dipotassium (9R,12R)-12-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-3,8,11-trioxo-1-phenyl-9-(sulfonatomethyl)-2-oxa-4,7,10-triazatridecane-13-sulfonate (556.5 mg), followed by stirring for 2 hours at room temperature. The solvent was distilled away under reduced pressure, acetonitrile (10 mL) and toluene (10 mL) were added to the residue, and the solvent was distilled away under reduced pressure. Acetonitrile (20 mL) was added thereto, and the resultant was stirred overnight. Then, the solid was collected by filtration, thereby obtaining dipotassium (9R,12R)-12-amino-3,8,11-trioxo-1-phenyl-9-(sulfonatomethyl)-2-oxa-4,7,10-triazatridecane-13-sulfonate (452 mg) as a white solid.
LC/MS rt (min): 0.65
MS (ESI, m/z): 495.1 [free from M−H]−
1H-NMR (DMSO-d6/TFA-d) δ: 8.75 (1H, d, J=7.2 Hz), 8.10 (2H, brs), 7.28-7.26 (2H, m), 7.17 (1H, brs), 5.01 (2H, brs), 4.43 (1H, q, J=7.2 Hz), 3.98-4.01 (1H, m), 2.78-3.18 (8H, m)
A DMF (4.5 mL) solution of dipotassium (9R,12R)-12-amino-3,8,11-trioxo-1-phenyl-9-(sulfonatomethyl)-2-oxa-4,7,10-triazatridecane-13-sulfonate (224 mg) and 2-(4,7,10-tris(2-(tert-butoxy)-2-oxoethyl)-1,4,7,10-tetraazacyclododecan-1-yl) acetic acid (236 mg) was stirred for 20 minutes at room temperature, and then DIEA (0.14 mL) and HBTU (157 mg) were added thereto, followed by stirring. Water (0.1 mL) and ethyl acetate (13.5 mL) were added thereto, followed by stirring. Thereafter, the precipitated solid was collected by filtration, and the solvent was distilled away under reduced pressure. Then, water (3 mL) and ethyl acetate (3 mL) were added thereto, and an aqueous layer was fractionated and washed with ethyl acetate (3 mL). Subsequently, an aqueous saturated sodium hydrogen carbonate solution (2 mL) was added thereto, and a reversed-phase silica gel column (inner diameter of glass column: 10.5 cm, Daisogel-SR120-40/60-ODS-RPS: 400 g) was charged with the solution, and elution was performed under a normal pressure by using an aqueous saturated sodium carbonate solution (6 mL), water (6 mL), 0.1% formic acid-containing water (6 mL), 0.1% formic acid/20% acetonitrile-containing water (6 mL), 0.10% formic acid/40% acetonitrile-containing water (12 mL), and 0.1% formic acid/60% acetonitrile-containing water (12 mL) in this order, thereby obtaining (9R,12R)-3,8,11-trioxo-1-phenyl-9-(sulfomethyl)-12-(2-(4,7,10-tris(2-(tert-butoxy)-2-oxoethyl)-1,4,7,10-tetraazacyclododecan-1-yl)acetamide)-2-oxa-4,7,10-triazatridecane-13-sulfonic acid (265 mg) as a white solid.
MS (ESI, m/z): 1151 [M+H]+
1H-NMR (D2O) δ: 7.49-7.35 (5H, m), 5.10 (2H, s), 4.35-2.82 (34H, m), 1.57-1.38 (27H, m)
10% palladium on carbon (26 mg), (9R,12R)-3,8,11-trioxo-1-phenyl-9-(sulfomethyl)-12-(2-(4,7,10-tris(2-(tert-butoxy)-2-oxoethyl)-1,4,7,10-tetraazacyclododecan-1-yl)acetamide)-2-oxa-4,7,10-triazatridecane-13-sulfonic acid (244 mg), water (0.15 mL), and methanol (3 mL) were put into a stainless steel tube, followed by stirring for 2 hours at room temperature in a nitrogen atmosphere at 0.9 MPa. The insoluble matter was removed by filtration, and the solvent was distilled away under reduced pressure, thereby obtaining (R)-3-((2-aminoethyl)amino)-3-oxo-2-((R)-3-sulfo-2-(2-(4,7,10-tris(2-(tert-butoxy)-2-oxoethyl)-1,4,7,10-tetraazacyclododecan-1-yl)acetamide)propanamide)propane-1-sulfonic acid (209 mg) as a white solid.
MS (ESI, m/z): 917 [M+H]+
1H-NMR (D2O) δ: 3.83-3.25 (16H, m), 3.18-2.78 (18H, m), 1.51-1.45 (27H, m)
A mixture of potassium bromide (60.2 g), water (300 mL), hydrobromic acid (40 mL), and (S)-2-amino-5-(benzyloxy)-5-oxopentanoic acid (40.0 g) was cooled to 3° C., and an aqueous solution (60 mL) of sodium nitrite (23.3 g) was added dropwise thereto for 1 hour and 50 minutes, followed by stirring for 40 minutes. Sulfuric acid (10 mL) was added thereto, followed by stirring for 10 minutes. Then, the organic layer was fractionated by adding ethyl acetate (400 mL), washed twice with water (400 mL), and dried over anhydrous sodium sulfate, and then the solvent was concentrated under reduced pressure. The resultant was purified by silica gel column chromatography (hexane/ethyl acetate=100/0 to 50/50), thereby obtaining (S)-5-(benzyloxy)-2-bromo-5-oxopentanoic acid (36.1 g) as a colorless oily substance.
MS (ESI, m/z): 299 [M−H]−
1HNMR (CDCl3, 300 MHz) δ: 7.38-7.33 (4H, m), 5.15 (2H, s), 4.42 (1H, dd, J=8.6, 5.9 Hz), 2.67-2.59 (2H, m), 2.53-2.25 (2H, m)
Optical purity: 97% ee
At a temperature of 4° C., a mixture of tert-butyl 2,2,2-trichloroacetimidate (43.0 mL) and hexane (72 mL) was added dropwise for 30 minutes to a mixture of (S)-5-(benzyloxy)-2-bromo-5-oxopentanoic acid (36.1 g), chloroform (72.0 mL), and hexane (72.0 mL), and then a boron trifluoride diethyl ether complex (1.51 mL) was added thereto for 5 minutes, followed by stirring for 1 hour. Sodium hydrogen carbonate (10 g) was added thereto, followed by stirring for 1 hour. Then, the insoluble matter was removed by filtration, and the solvent was distilled away under reduced pressure. The obtained residue was purified by silica gel column chromatography (hexane/ethyl acetate=100/0 to 85/15), thereby obtaining (S)—O5-benzyl O1-tert-butyl 2-bromopentanedioate (39.0 g) as a colorless oily substance.
1HNMR (CDCl3, 300 MHz) δ: 7.37 (5H, s), 5.14 (2H, s), 4.24 (1H, dd, J=8.6, 5.9 Hz), 2.60-2.52 (2H, m), 2.44-2.18 (2H, m), 1.52 (9H, s)
Optical purity: 94% ee
At room temperature, a chloroform (380 mL) solution of (S)—O5-benzyl O1-tert-butyl 2-bromopentanedioate (38.0 g) was added dropwise for 30 minutes to a chloroform (200 mL) solution of 1,4,7-triazacyclononane (41.1 g), followed by stirring for 19 hours at room temperature. By adding water (400 mL) to the reaction mixture, the organic layer was fractionated, and the aqueous layer was extracted using chloroform (200 mL). The organic layer was dried over anhydrous sodium sulfate, and the solvent was distilled away under reduced pressure. The obtained residue was purified by silica gel column chromatography (dichloromethane/ethanol=100/90 to 99/1), thereby obtaining (R)—O5-benzyl O1-tert-butyl 2-(1,4,7-triazonan-1-yl)pentanedioate (23.0 g) as a colorless oily substance.
MS (ESI, m/z): 406 [M+H]+
1HNMR (CDCl3, 300 MHz) δ: 7.34 (5H, s), 5.13 (2H, s), 3.22 (1H, dd, J=8.6, 6.6 Hz), 2.87-2.62 (12H, m), 2.61-2.51 (2H, m), 2.11-1.85 (4H, m), 1.46 (9H, s)
At a temperature of 3° C., potassium carbonate (19.6 g) and tert-butyl bromoacetate (16.5 mL) were added to an acetonitrile (230 mL) solution of (R)—O5-benzyl O1-tert-butyl 2-(1,4,7-triazonan-1-yl)pentanedioate (23.0 g), followed by stirring for 5 hours at room temperature. The insoluble matter was removed by filtration, the solvent was distilled away under reduced pressure, and the obtained residue was purified by silica gel column chromatography (hexane/ethyl acetate=100/0 to 85/15), thereby obtaining (R)—O5-benzyl O1-tert-butyl 2-(4,7-bis(2-(tert-butoxy)-2-oxoethyl)-1,4,7-triazonan-1-yl)pentanedioate (30.7 g) as a colorless oily substance.
MS (ESI, m/z): 634 [M+H]+
1HNMR (CDCl3, 300 MHz) δ: 7.35 (5H, s), 5.13 (2H, s), 3.28 (4H, s), 3.18 (1H, dd, J=8.9, 6.3 Hz), 2.98-2.65 (12H, m), 2.65-2.44 2H, m), 2.08-1.81 (2H, m), 1.44 (27H, s)
Optical purity: 96% ee
(R)—O5-benzyl O1-tert-butyl 2-(4,7-bis(2-(tert-butoxy)-2-oxoethyl)-1,4,7-triazonan-1-yl)pentanedioate (30.6 g), tetrahydrofuran (150 mL), and palladium hydroxide/carbon (6.1 g) were put into an autoclave, followed by stirring for 3 hours at room temperature in a nitrogen atmosphere at 5.0 MPa. The insoluble matter was removed by celite filtration, the solvent was removed under reduced pressure, thereby obtaining a black oily substance. Ethyl acetate (150 mL) and active carbon (10 g) were added to the obtained oily substance. Then, the insoluble matter was removed by filtration, and the solvent was distilled away under reduced pressure, thereby obtaining (R)-4-(4,7-bis(2-(tert-butoxy)-2-oxoethyl)-1,4,7-triazonan-1-yl)-5-(tert-butoxy)-5-oxopentanoic acid (24.2 g) as a light yellow solid.
LC/MS rt (min): 1.34
MS (ESI, m/z): 544.5 [M+H]+
1HNMR (CDCl3, 300 MHz) δ: 3.38 (4H, s), 3.32 (1H, dd, J=9.8, 4.0 Hz), 3.19-2.93 (8H, m), 2.82 (4H, s), 2.74-2.64 (1H, m), 2.57-2.47 (1H, m), 2.07-1.89 (2H, m), 1.48 (9H, s), 1.45 (18H, s)
Optical purity: 98% ee
A 8.0 M aqueous potassium hydroxide solution (3.36 mL) was added to a tetrahydrofuran (20 mL) solution of (S)-tert-butyl 5-oxotetrahydrofuran-2-carboxylate (5.0 g), followed by stirring for 1 hour at 40° C. Water (23.5 mL) was added thereto, and the solution was stirred for 2 hours and then for 1.5 hours at 45° C. A 8.0 M aqueous potassium hydroxide solution (0.67 mL) and water (4.71 mL) were added thereto, followed by stirring for 2.5 hours, and the solvent was distilled away under reduced pressure. N,N′-dimethylformamide (20 mL) was added to the obtained solid, followed by stirring. Then, 4-bromomethylbiphenyl (5.98 g) was added thereto, followed by stirring for 16 hours. Water (150 mL) was added to the reaction mixture, extraction was performed twice by using ethyl acetate (50 mL). Thereafter, the organic layer was dried over anhydrous sodium sulfate, and the solvent was distilled away under reduced pressure. The obtained crude product was purified by silica gel column chromatography (CHROMATOREX (FUJI SILYSIA CHEMICAL LTD), hexane/ethyl acetate=100/0 to 85/15), thereby obtaining a white solid (6.0 g). An ethyl acetate (8 mL) solution of the obtained solid (5.2 g) was stirred at 70° C. such that the solid dissolved, and then hexane (72 mL) was added thereto, followed by stirring for 4 hours at room temperature. The precipitated solid was collected by filtration, washed with hexane, and dried under reduced pressure, thereby obtaining (S)—O5—([1,1′-biphenyl]-4-ylmethyl)O-tert-butyl 2-hydroxypentanedioate (4.28 g) as a white solid.
LC/MS rt (min): 1.78
MS (ESI, m/z): 371.3 [M+H]+
1H-NMR (CDCl3) δ: 7.62-7.56 (4H, m), 7.48-7.41 (4H, m), 7.39-7.32 (1H, m), 5.17 (2H, s), 4.13-4.07 (1H, m), 2.87 (1H, d, J=5.3 Hz), 2.63-2.43 (2H, m), 2.23-2.12 (1H, m), 1.98-1.86 (1H, m), 1.49 (9H, s)
Optical purity: 100% ee
At a temperature of 0° C., 4-methylmorpholine (594 μL) and chloromethane sulfonyl chloride (436 μL) were added to a methylene chloride (5 mL) solution of (S)—O5-([1,1′-biphenyl]-4-ylmethyl)O1-tert-butyl 2-hydroxypentanedioate (1.0 g), followed by stirring for 30 minutes. Water (20 mL) was added thereto, and then the organic layer was fractionated and dried over anhydrous sodium sulfate. Then, the solvent was distilled away under reduced pressure, thereby obtaining (S)—O5-([1,1′-biphenyl]-4-ylmethyl)O1-tert-butyl 2-(((chloromethyl)sulfonyl)oxy)pentanedioate (1.46 g) as a light yellow oily substance.
LC/MS rt (min): 1.96
MS (ESI, m/z): 484.2 [M+H]+
1H-NMR (CDCl3) δ: 7.60-7.59 (4H, m), 7.48-7.41 (4H, m), 7.38-7.34 (1H, m), 5.19 (2H, s), 5.09 (1H, dd, J=8.3, 4.3 Hz), 4.73 (2H, dd, J=17.5, 12.2 Hz), 2.68-2.50 (2H, m), 2.43-2.15 (2H, m)
Potassium carbonate (57 mg) was added to an acetonitrile (1 mL) solution of di-tert-butyl 2,2′-(1,4,7-triazonane-1,4-diyl) diacetate (89 mg), followed by stirring for 5 minutes. An acetonitrile (1 mL) solution of (S)—O5-([1,1-biphenyl]-4-ylmethyl)O-tert-butyl 2-tert-butyl 2-(((chloromethyl)sulfonyl)oxy)pentanedioate (100 mg) was added to the obtained mixture, followed by stirring for 20 minutes. Water (2 mL) was added thereto, extraction was then performed twice by using ethyl acetate (3 mL), and the organic layer was fractionated. The solvent was distilled away under reduced pressure, and the residue was purified by silica gel column chromatography (KP-NH (Biotage), hexane/ethyl acetate=100/0 to 80/20), thereby obtaining (R)—O5-([1,1′-biphenyl]-4-ylmethyl)O1-tert-butyl 2-(4,7-bis(2-(tert-butoxy)-2-oxoetyl)-1,4,7-triazonan-1-yl)pentanedioate (126 mg) as a light yellow oily substance.
LC/MS rt (min): 1.96
MS (ESI, m/z): 710.5 [M+H]+
1H-NMR (CDCl3) δ: 7.62-7.56 (4H, m), 7.48-7.41 (4H, m), 7.39-7.32 (1H, m), 5.17 (2H, s), 3.28 (4H, s), 3.19 (1H, dd, J=8.9, 6.3 Hz), 2.98-2.67 (12H, m), 2.65-2.46 (2H, m), 2.08-1.84 (2H, m), 1.44 (27H, s)
Optical purity: 98.9% ee
10% palladium hydroxide on carbon (340 mg) and a tetrahydrofuran (17 mL) solution of (R)—O5-([1,1′-biphenyl]-4-ylmethyl)O1-tert-butyl 2-(4,7-bis(2-(tert-butoxy)-2-oxoetyl)-1,4,7-triazonan-1-yl)pentanedioate (1.71 g) were put into an autoclave, followed by stirring for 4 hours at room temperature in a nitrogen atmosphere at 0.9 MPa. The insoluble matter was removed by filtration, and the solvent was distilled away under reduced pressure. Ethyl acetate (8.5 mL) and activated carbon (510 mg) were added to the obtained black oily substance, followed by stirring for 15 minutes at room temperature. The insoluble matter was removed by filtration by using celite, and the solvent was distilled away under reduced pressure, thereby obtaining a brown oily substance (1.49 g). An aqueous solution (10 mL) was added to the obtained oily substance (500 mg), followed by stirring for 30 minutes with ice cooling, and the insoluble matter was removed by filtration. Extraction was performed twice for the obtained filtrate by using chloroform (10 mL), and the solvent was distilled away under reduced pressure, thereby obtaining (R)-4-(4,7-bis(2-(tert-butoxy)-2-oxoethyl)-1,4,7-triazonan-1-yl)-5-(tert-butoxy)-5-oxopentanoic acid (456 mg) as a yellow oily substance.
LC/MS rt (min): 1.34
MS (ESI, m/z): 544.5 [M+H]+
A mixture of (R)-4-(4,7-bis(2-(tert-butoxy)-2-oxoethyl)-1,4,7-triazonan-1-yl)-5-(tert-butoxy)-5-oxopentanoic acid (22.0 g), DMAc (150 mL), DIEA (16.9 mL), and (R)-2-amino-3-((2-(((benzyloxy)carbonyl)amino)ethyl)amino)-3-oxopropane-1-sulfonic acid (14.7 g) was stirred for 20 minutes at room temperature, and then HBTU (16.9 g) was added thereto, followed by stirring for 1.5 hour at room temperature. The mixture was cooled to 7° C., and then an aqueous saturated sodium chloride solution (600 mL) and ethyl acetate (600 mL) were added thereto, followed by stirring. The organic layer was fractionated, washed twice with an aqueous saturated sodium hydrogen carbonate solution (600 mL), and dried over sodium sulfate, and the solvent was distilled away under reduced pressure, thereby obtaining (R)-3-((2-(((benzyloxy)carbonyl)amino)ethyl)amino)-2-((R)-4-(4,7-bis(2-(tert-butoxy)-2-oxoethyl)-1,4,7-triazonan-1-yl)-5-(tert-butoxy)-5-oxopentanamide)-3-oxopropane-1-sulfonic acid (37.2 g) as a yellow solid.
LC/MS rt (min): 1.45
MS (ESI, m/z): 871 [M+H]+
1H-NMR (CDCl3, 300 MHz) δ: 7.52 (1H, brs), 7.30 (5H, m), 6.10 (1H, brs), 5.06 (2H, brs), 4.84 (1H, brs), 3.80-1.67 (29H, m), 1.47-1.41 (27H, m) HPLC (Waters BEH C18, formic acid-based, gradient cycle: 0 min (A solution/B solution=50/50), 15 min (A solution/B solution=0/100), 18 min (A solution/B solution=0/100), flow rate: 0.4 mL/min) rt (min)): 8.95
Palladium hydroxide on carbon (3.7 g), ethanol (250 mL), and (R)-3-((2-(((benzyloxy)carbonyl)amino)ethyl)amino)-2-((R)-4-(4,7-bis(2-(tert-butoxy)-2-oxoethyl)-1,4,7-triazonan-1-yl)-5-(tert-butoxy)-5-oxopentanamide)-3-oxopropane-1-sulfonic acid (37.0 g) were put into an autoclave, followed by stirring for 3 hours in a nitrogen atmosphere at 4.0 MPa. The insoluble matter was removed by filtration, and the solvent was distilled away under reduced pressure. Ethanol (150 mL) and active carbon (8 g) were added to the obtained oily substance, followed by stirring for 30 minutes at room temperature, the insoluble matter was removed by filtration, and the solvent was distilled away under reduced pressure, thereby obtaining (R)-3-((2-aminoethyl)amino)-2-((R)-4-(4,7-bis(2-(tert-butoxy)-2-oxoethyl)-1,4,7-triazonan-1-yl)-5-(tert-butoxy)-5-oxopentanamide)-3-oxopropane-1-sulfonic acid (30.0 g) as a black solid.
LC/MS rt (min): 1.13
MS (ESI, m/z): 737 [M+H]+
1H-NMR (CDCl3, 300 MHz) δ: 7.72 (1H, brs), 4.83 (1H, brs), 3.75-1.82 (31H, m), 1.46 (27H, s) HPLC (Waters BEH, formic acid-based, gradient cycle: 0 min (A solution/B solution=50/50), 7 min (A solution/B solution=40/60), 15 min (A solution/B solution=0/100), flow rate: 0.4 mL/min) rt (min)): 6.70
(1) Concentrated sulfuric acid (20 mL) was added to a methanol (1 L) solution of 6-oxopentaonic acid (99.2 g), and the mixture was heated for 4 hours under reflux. After the reaction mixture was cooled to room temperature, the solvent was distilled away under reduced pressure, and water (1 L) and ethyl acetate (600 mL) were added thereto. The organic layer was fractionated and washed with a 5% aqueous sodium hydrogen carbonate solution (600 mL) and an aqueous saturated sodium chlorides solution (600 mL), and the solvent was distilled away under reduced pressure, thereby obtaining (01) (95.2 g).
TLC Rf: 0.45 (hexane/ethyl acetate=2/1)
(2)
(01) (189 g) and methanol (600 mL) were added to a mixture of 2-aminonicotinaldehyde (133 g) and methanol (500 mL), and then pyrrolidine (100 mL) was added thereto, and the mixture was heated for 8 hours under reflux. The reaction mixture was cooled to room temperature, the solvent was distilled away under reduced pressure, toluene (100 mL) was added thereto, and the solvent was distilled away under reduced pressure. Toluene (150 mL) was added to the obtained residue, followed by stirring for 2 hours at 50° C. and then for 3 hours at room temperature, and the solid was collected by filtration, thereby obtaining (02) (149 g).
TLC Rf: 0.56 (hexane/ethyl acetate=5/1)
LC/MS rt (min): 0.73
MS (ESI, m/z): 245.2 [M+H]+
(3)
10% palladium on carbon (10.0 g), (02) (97.5 g), and methanol (250 mL) were put into an autoclave, followed by stirring for 8 hours in a hydrogen atmosphere at 5 MPa. The insoluble matter was removed by filtration, and the solvent was distilled away under reduced pressure. Acetonitrile (100 mL) was added to the obtained residue, and the solid was collected by filtration, thereby obtaining (03) (71.5 g).
1H-NMR (CDCl3, 300 MHz) δ: 7.05 (1H, d, J=7.5 Hz), 6.34 (1H, d, 7.5 Hz), 4.74 (1H, brs), 3.66 (3H, s), 3.37-3.42 (2H, m), 2.68 (2H, t, J=6.0 Hz), 2.52-2.57 (2H, m), 2.30-2.37 (2H, m), 1.90 (2H, tt, J=5.7, 6.0 Hz), 1.63-1.70 (4H, m)
HPLC (Waters 600E system (Waters) (column: CAPCELL PAK C18MG, 4.6×150 mm (Shiseido Japan Co., Ltd.), solvent: A solution=formic acid:water (1:1,000), B solution=formic acid:methanol:acetonitrile (1:800:200), gradient cycle: 0 min (A solution/B solution=80/20), 10 min (A solution/B solution=0/100), 15 min (A solution/B solution=0/100), flow rate: 1.0 mL/min) rt (min): 8.06
(4)
Methanol (210 mL) was added to (03) (70.0 g), and the mixture was dissolved by being heated to 40° C. Then, a mixture of sodium hydroxide (16.9 g) and water (105 mL) was added dropwise thereto for 15 minutes, followed by stirring for 1 hour at 40° C. The solvent was distilled away under reduced pressure, and water (210 mL) was added thereto. The solution was heated to 40° C., and concentrated hydrochloric acid was added dropwise thereto until the pH became 5, at a temperature kept to be equal to or lower than 50° C. Water (50 mL) was added thereto, the solution was cooled to room temperature and left to stand overnight. The solid was collected by filtration, thereby obtaining (04) (62.2 g).
LC/MS rt (min): 0.62
MS (ESI, m/z): 235.2 [M+H]+
HPLC (Waters 600E system (Waters) (column: CAPCELL PAK C18MG, 4.6×150 mm (Shiseido Japan Co., Ltd.), solvent: A solution=formic acid:water (1:1,000), B solution=formic acid:methanol:acetonitrile (1:800:200), gradient cycle: 0 min (A solution/B solution=80/20), 10 min (A solution/B solution=0/100), 15 min (A solution/B solution=0/100), flow rate: 1.0 mL/min) rt (min): 7.03
(5)
HBTU (4.98 g) was added little by little to a mixture of methyl (2S)-3-amino-2-((4-(4-((2-(benzyloxycarbonylamino)ethyl)amino)-4-oxobutoxy)-2,6-dimethylphenyl)sulfonylamino)propanoate (7.40 g), (04) (3.37 g), DMF (50 mL), and DIEA (3.86 mL), followed by stirring for 2 hours at room temperature. A 5% aqueous sodium hydrogen carbonate solution (200 mL) and ethyl acetate (200 mL) were added to the reaction mixture, followed by stirring for 10 minutes at room temperature. The organic layer was fractionated, washed three times with an aqueous saturated sodium chloride solution, and dried over anhydrous sodium sulfate, and then the solvent was distilled away under reduced pressure. Ethyl acetate (50 mL) was added to the obtained residue, and the solid was collected by filtration, thereby obtaining (05) (9.20 g).
LC/MS rt (min): 1.12
MS (ESI, m/z): 781.5 [M+H]+, 779.6 [M−H]−
(6)
Methanol (40 mL) was added to (05) (7.20 g) and 10% Pd/C (300 mg), followed by stirring for 3 hours at room temperature in a hydrogen atmosphere. The insoluble matter was removed by filtration, and the solvent was distilled away under reduced pressure. Toluene (50 mL) was added to the obtained residue, and the solvent was distilled away under reduced pressure, thereby obtaining (06) (5.45 g).
LC/MS rt (min): 0.73
MS (ESI, m/z): 647.4 [M+H]+
(7)
A DMF (1.5 mL) solution of HBTU (141 mg) was added to a solution of (06) (120 mg), Fmoc-cysteic acid (145 mg), DMF (2 mL), and DIEA (140 μL), followed by stirring for 20 minutes at room temperature. Water (2 mL) was added thereto, and the resultant was purified by preparative HPLC, thereby obtaining (07) (87.7 mg).
LC/MS (LCMS-2010EV (Shimadzu Corporation) (column: SunFire C 18 4.6×150 mm (Waters), solvent: A solution=0.1% formic acid/water, B solution=0.1% formic acid/methanol:acetonitrile (4:1), gradient cycle: 0 min (A solution/B solution=80/20), 10 min (A solution/B solution=0/100), 15 min (A solution/B solution=0/100), flow rate: 1 mL/min) rt (min): 11.83
MS (ESI, m/z): 1020.25 [M+H]+, 1018.50 [M−H]−
(8)
Diethylamine (0.5 mL) was added to a DMF (0.5 mL) solution of (07) (28.1 mg), followed by stirring for 1.5 hours at room temperature. The solvent was distilled away under reduced pressure, DMF (400 μL) and DIEA (20 μL) were added, and then a DMF (150 μL) solution of tri-tert butyl 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (31.6 mg), DMF (150 μL), DIEA (20 μL), and HBTU (20.9 mg) was added thereto, followed by stirring for 45 minutes at room temperature. Water (500 μL) was added thereto, extraction was performed three times by using hexane/ethyl acetate (1/1) (0.5 mL), and the extract was purified by preparative HPLC, thereby obtaining (p1) (19.6 mg).
LC/MS rt (min): 1.12
MS (ESI, m/z): 1352.5 [M+H]+, 1350.6 [M−H]−
HPLC (Waters 600E system (Waters) (column: SunFire C18OBD, 4.6×150 mm (Waters), solvent: A solution=formic acid:water (1:1,000), B solution=formic acid:methanol:acetonitrile (1:800:200), gradient cycle: 0 min (A solution/B solution=80/20), 10 min (A solution/B solution=0/100), 15 min (A solution/B solution=0/100), flow rate: 1.0 mL/min) rt (min): 9.71
(9)
THF (1.4 mL), water (200 μL), and a 3 mol/L aqueous lithium hydroxide solution (200 μL) were added to (P1) (11.8 mg), followed by stirring for 1.5 hours at room temperature. TFA was added thereto, and the solvent was distilled away under reduced pressure. TFA/triethylsilane (95/5) (1 mL) were added to the obtained residue, followed by stirring for 100 minutes at room temperature. The solvent was distilled away under reduced pressure, water/acetonitrile (2/1) (1.8 mL) and formic acid (1.8 μL) were added thereto, and the obtained resultant was purified by preparative HPLC, thereby obtaining (P2) (compound A) (8.9 mg).
LC/MS rt (min): 0.75
MS (ESI, m/z): 1170.4 [M+H]+, 585.9 [M+2H]2+, 1168.4 [M−H]−
HPLC (Waters 600E system (Waters) (column: SunFire C18OBD, 4.6×150 mm (Waters), solvent: A solution=formic acid:water (1:1,000), B solution=formic acid:methanol:acetonitrile (1:800:200), gradient cycle: 0 min (A solution/B solution=80/20), 10 min (A solution/B solution=0/100), 15 min (A solution/B solution=0/100), flow rate: 1.0 mL/min) rt (min): 8.75
(1) Sodium nitrite (2.6 g) was added for 10 minutes to a mixture of L-glutamic acid γ benzyl ester (5.0 g), water (10 mL), sodium bromide (7.6 g), and hydrobromic acid (6 mL) at a temperature of equal to or lower than 5° C., followed by stirring for 2 hours at 5° C. Diisopropylether and concentrated sulfuric acid (2 mL) were added to the reaction mixture, and the organic layer was fractionated, sequentially washed with water and an aqueous saturated sodium chloride solution, and then dried over anhydrous sodium sulfate. The solvent was distilled away under reduced pressure, and the obtained residue was purified by silica gel column chromatography (hexane/ethyl acetate=1/1), thereby obtaining (Aa1) (3.1 g).
LC/MS rt (min): 1.32
MS (ESI, m/z): 301.1 [M+H]+
1H-NMR (300 MHz, CDCl3) δ: 7.31-7.38 (5H, m), 5.1 (2H, s), 4.41 (1H, dd, J=6.0, 7.8 Hz), 2.58-2.63 (2H, m), 2.25-2.50 (2H, m)
(2)
A mixture of tert-butyl 2,2,2-trichloroacetimidate (4.3 mL) and hexane (12 mL) was added for 20 minutes to a chloroform (15 mL) solution of (Aa1) (3.1 g) at room temperature. DMAc (1.5 mL) and BF3·OEt2 (220 μL) were added thereto, followed by stirring for 40 minutes at room temperature, the solvent was distilled away under reduced pressure, and the obtained resultant was purified by silica gel column chromatography (hexane/ethyl acetate=95/5 to 85/15), thereby obtaining (Aa2) (2.84 g).
1H-NMR (300 MHz, CDCl3) δ: 7.31-7.38 (5H, m), 5.14 (2H, s), 4.24 (1H, dd, J=6.0, 8.7 Hz), 2.53-2.59 (2H, m), 2.19-2.43 (2H, m), 1.47 (9H, s)
(3)
A chloroform (50 mL) solution of (Aa2) (1.70 g) was added for 90 minutes to a chloroform (60 mL) solution of 1,4,7-triazacyclononane (1.84 g), followed by stirring for 3 days at room temperature. The solvent was distilled away under reduced pressure, and the obtained resultant was purified by silica gel column chromatography (hexane/ethyl acetate=50/50 to 0/100 and then ethyl acetate/methanol=80/20), thereby obtaining (Aa3) (0.76 g).
LC/MS rt (min): 0.91
MS (ESI, m/z): 406.5 [M+H]+
(4)
Tert-butyl bromoacetate (580 μL) was added to a mixture of (Aa3) (0.76 g), DMAc (7 mL), and potassium carbonate (607 mg), followed by stirring for 2 hours at room temperature. Ethyl acetate (30 mL) and water (30 mL) were added thereto, and the organic layer was fractionated, sequentially washed twice with water (30 mL) and once with an aqueous saturated sodium chloride solution (30 mL), and dried over anhydrous sodium sulfate. The solvent was distilled away under reduced pressure, and the obtained residue was purified by silica gel column chromatography (hexane/ethyl acetate=95/5 to 60/40), thereby obtaining (Aa4) (1.04 g).
LC/MS rt (min): 1.63
MS (ESI, m/z): 634.7 [M+H]+
(5)
(Aa 4) (0.28 g), isopropyl alcohol (20 mL), water (0.5 mL), and 10% palladium on carbon (0.10 g) were put into a sealed tube, followed by stirring for 7 hours in a hydrogen atmosphere at 0.5 MPa. The insoluble matter was removed by filtration, and the solvent was distilled away under reduced pressure, thereby obtaining (Aa5) (0.24 g).
LC/MS rt (min): 1.34
MS (ESI, m/z): 544.7 [M+H]+
(6)
HBTU (64.5 mg) was added to a mixture of (Aa5) (94.9 mg), (R)-2-amino-3-((2-(4-(4-(N—((S)-1-methoxy-1-oxo-3-(5-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propan-2-yl)sulfamoyl)-3,5-dimethylphenoxy)butanamide)ethyl)amino)-3-oxopropane-3,5-dimethylphenoxy)butanamide)ethyl)amino)-3-oxopropan-1-sulfonic acid (104 mg), DMF (0.8 mL), and N,N-diisopropylethylamine (61 μL), followed by stirring for 35 minutes at room temperature. Water (1.1 mL) and acetonitrile (0.8 mL) were added thereto, followed by stirring, and then the resultant was purified by preparative HPLC, thereby obtaining (Aa6) (151 mg).
LC/MS rt (min): 1.28
MS (ESI, m/z): 1324.2 [M+H]+, 1322.2 [M−H]−
HPLC (Waters 600E system (Waters) (column: CAPCELL PAK C18MG, 4.6×150 mm (Shiseido Japan Co., Ltd.), solvent: A solution=formic acid:water (1:1,000), B solution=formic acid:methanol:acetonitrile (1:800:200), gradient cycle: 0 min (A solution/B solution=80/20), 10 min (A solution/B solution=0/100), 15 min (A solution/B solution=0/100), flow rate: 1.0 mL/min) rt (min): 11.82
(7)
Concentrated hydrochloric acid (2.5 mL) was added to (Aa6) (73 mg), followed by stirring for 2 days at room temperature, and the resultant was concentrated under reduced pressure. The resultant was diluted with 50% hydrous acetonitrile (2 mL) and then purified by preparative HPLC, thereby obtaining (Aa7) (compound B) (33.3 mg).
LC/MS rt (min): 0.77
MS (ESI, m/z): 1141.8 [M+H]+, 1139.8 [M−H]−
HPLC (Waters 600E system (Waters) (column: CAPCELL PAK C18MG, 4.6×150 mm (Shiseido Japan Co., Ltd.), solvent: A solution=formic acid:water (1:1,000), B solution=formic acid:methanol:acetonitrile (1:800:200), gradient cycle: 0 min (A solution/B solution=80/20), 10 min (A solution/B solution=0/100), 15 min (A solution/B solution=0/100), flow rate: 1.0 mL/min) rt (min): 9.37
In the present reference example, the compound A obtained in Reference Example 8 and the compound B obtained in Reference Example 9 were used.
(A)
A indium [111In] chloride solution (80 MBq, 100 μL) was added to a mixture of the compound A (8.5 μg) and a 0.2 mol/L sodium acetate buffer solution (pH 4.0) (1.5 mL). The solution was heated to 100° C. for 15 minutes and then left to stand for 5 minutes at room temperature, thereby obtaining [111In]-(compound A). As a result of analyzing the compound by using reversed-phase TLC (Whatman, KC18F, developing solvent: methanol/0.5 mol/L aqueous sodium acetate solution (50/50)), the Rf value of the radiolabeled compound was found to be 0.4. The radiochemical purity measured immediately after the compound was prepared and measured after 24 hours at room temperature was equal to or higher than 95%.
(B)
A yttrium [90Y] chloride solution (700 MBq, 240 μL) was added to a mixture of the compound (79 μg), gentisic acid (1.8 mg), a 0.6 mol/L sodium acetate buffer solution (pH 4.0, 120 μL), and 0.4 mol/L aqueous sodium hydroxide solution (24 μL). The solution was heated to 100° C. for 20 minutes and then left to stand for 5 minutes at room temperature, thereby obtaining [90Y]-(compound A). As a result of analyzing the compound by using reversed-phase TLC (Whatman, KC18F, developing solvent: methanol/0.5 mol/L aqueous ammonium acetate solution (50/50)), the Rf value of the radiolabeled compound was found to be 0.4. The radiochemical purity measured immediately after the compound was prepared and measured after 24 hours at room temperature was equal to or higher than 95%.
(C)
A copper [64Cu] chloride solution (pH 5, 35 MBq, 55 μL) was added to a mixture of the compound A (5.8 μg) and 0.2 mol/L sodium acetate buffer solution (pH 4.0, 219 μL). The solution was heated to 100° C. for 15 minutes and left to stand for 5 minute at room temperature, thereby obtaining [64Cu]-(compound A). As a result of analyzing the compound by using reversed-phase TLC (Whatman, KC18F, developing solvent: methanol/0.5 mol/L aqueous ammonium acetate solution (50/50)), the Rf value of the radiolabeled compound was found to be 0.4. The radiochemical purity measured immediately after the compound was prepared and measured after 22 hours at room temperature was equal to or higher than 90%.
(D)
A 0.2 mol/L sodium acetate buffer solution of Copper [64Cu] chloride (pH 4.0) (40 MBq, 155 μL) was added to a mixture of the compound B (4.2 μg), gentisic acid (1 mg), and a 0.2 mol/L sodium acetate buffer solution (pH 4.0) (5.0 μL). The solution was heated to 100° C. for 15 minutes and left to stand for 5 minutes at room temperature, thereby obtaining [64Cu]-(compound B). As a result of analyzing the compound by using reversed-phase TLC (Merck, RP-8 F254S, developing solvent: methanol/0.5 mol/L aqueous ammonium acetate solution (50/50)), the Rf value of the radiolabeled compound was found to be 0.4. The radiochemical purity measured immediately after the compound was prepared and measured after 24 hours at room temperature was equal to or higher than 90%.
HBTU (0.252 g) was added to a mixture of (S)-4-(4-(N-(1-(tert-butoxy)-1-oxo-3-(5-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propan-2-yl)sulfamoyl)-3,5-dimethylphenoxy)butanoic acid (0.500 g), (R)-3-((2-aminoethyl)amino)-3-oxo-2-(2-(4,7,10-tris(2-(tert-butoxy)-2-oxoethyl)-1,4,7,10-tetraazacyclododecan-1-yl)acetamide)propane-1-sulfonic acid (0.711 g), DIEA (0.328 mL), and DMAc (5.0 mL), followed by stirring for 10 minutes. Then, HBTU (0.100 g) was further added thereto, followed by stirring for 2 hours. Water (15 mL) was added to the reaction mixture, followed by stirring for 10 minutes. Thereafter, water (10 mL) was added thereto, followed by stirring for 30 minutes. The supernatant liquid was removed, water (10 mL) was added to the residue, followed by stirring for 10 minutes. Subsequently, the supernatant liquid was removed, methanol (10 mL) was added thereto, and the solvent was distilled away under reduced pressure. The obtained residue was dissolved in ethyl acetate (2.26 mL) containing 12% methanol and purified by silica gel column chromatography (NH silica gel, methanol/ethyl acetate=3/97 to 30/70), thereby obtaining (R)-3-((2-(4-(4-(N—((S)-1-(tert-butoxy)-1-oxo-3-(5-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propan-2-yl)sulfamoyl)-3,5-dimethylphenoxy)butanamide)ethyl)amino)-3-oxo-2-(2-(4,7,10-tris(2-(tert-butoxy)-2-oxoethyl)-1,4,7,10-tetraazacyclododecan-1-yl)acetamide)propane-1-sulfonic acid (0.776 g) as a white amorphous solid.
MS (ESI, m/z): 1394 [M+H]+
1H-NMR (CDCl3) δ: 8.57-8.29 (1H, m), 8.14-8.00 (1H, m), 7.10-6.97 (2H, m), 6.66 (2H, s), 6.33 (1H, d, J=7.3 Hz), 6.30-6.22 (1H, m), 4.98-4.84 (1H, m), 4.74-4.61 (1H, m), 4.08-3.94 (2H, m), 3.78-1.55 (59H, m), 1.51-1.38 (27H, m), 1.30 (9H, s)
HPLC (TSKgel ODS-100Z) rt (min): 15.84
At room temperature, A mixture of TFA/triethylsilane (100 mL/13.7 mL) was added for 10 minutes to (R)-3-((2-(4-(4-(N—((S)-1-(tert-butoxy)-1-oxo-3-(5-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propan-2-yl)sulfamoyl)-3,5-dimethylphenoxy)butanamide)ethyl)amino)-3-oxo-2-(2-(4,7,10-tris(2-(tert-butoxy)-2-oxoethyl)-1,4,7,10-tetraazacyclododecan-1-yl)acetamide)propane-1-sulfonic acid (20.0 g), followed by stirring for 7 hours. TFA was distilled away under reduced pressure, and an operation of adding acetonitrile (50 mL) to the obtained residue and distilling away the solvent was repeated twice. The obtained residue was dissolved in acetonitrile (80 mL), and TBME (160 mL) was added thereto at room temperature, followed by stirring for 30 minutes. The precipitated solid was collected by filtration, thereby obtaining a TFA salt (21.3 g) of 2,2′,2″-(10-(2-(((R)-1-((2-(4-(4-(N—((S)-1-carboxy-2-(5-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)ethyl)sulfamoyl)-3,5-dimethylphenoxy)butanamide)ethyl)amino)-1-oxo-3-sulfopropan-2-yl)amino)-2-oxoethyl)-1,4,7,10-tetraazacyclododecane-1,4,7-triyl)triacetic acid (compound A) as a white solid.
MS (ESI, m/z): 1170 [free from M+H]+
Water (200 mL) and lithium carbonate (5.0 g) were added to the solid obtained in (2-1) such that the pH was adjusted to be 8.3. A reversed-phase silica gel column (inner diameter of glass column: 10.5 cm, Daisogel-SR120-40/60-ODS-RPS: 400 g) was charged with the reaction mixture, and elution was performed under a normal pressure by using 5% methanol-containing water (400 mL), 10% methanol-containing water (1,200 mL), 20% methanol-containing water (800 mL), and 30% methanol-containing water (1,600 mL) in this order, thereby obtaining a lithium salt (12.3 g) of the compound A as a white amorphous solid.
MS (ESI, m/z): 1170 [free from M+H]+
Water (120 mL) and formic acid (5.0 mL) were added to the solid (12.3 g) obtained in (2-2). A reversed-phase silica gel column (inner diameter of glass column: 10.5 cm, Daisogel-SR120-40/60-ODS-RPS: 400 g) was charged with the reaction mixture, and elution was performed under a normal pressure by using 0.1% formic acid/5% acetonitrile-containing water (800 mL), 10% acetonitrile-containing water (800 mL), and 30% acetonitrile-containing water (2,400 mL) in this order, thereby obtaining a compound A (11.1 g) as a white solid.
LC/MS rt (min): 0.75
MS (ESI, m/z): 1170.4 [M+H]+, 1168.4 [M−H]−,
1H-NMR (D2O) δ: 7.49 (1H, d, J=7.3 Hz), 6.71 (2H, s), 6.50 (1H, d, J=7.3 Hz), 4.67 (1H, dd, J=7.9, 5.0 Hz), 4.00 (2H, t, J=5.9 Hz), 3.93-3.02 (34H, m), 2.72 (2H, t, J=6.1 Hz), 2.59 (2H, t, J=7.3 Hz), 2.34 (2H, t, J=7.3 Hz), 2.12-1.80 (6H, m), 1.62-1.38 (4H, m) HPLC (TSKgel ODS-100Z, formic acid-based) rt (min): 11.17
HBTU (509 mg) was added to a NMP (4 mL) solution of (S)-4-(4-(N-(1-(tert-butoxy)-3-(5-(8-(tert-butoxycarbonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)-1-oxopropan-2-yl)sulfamoyl)-3,5-dimethylphenoxy)butanoic acid (668 mg), (R)-3-((2-aminoethyl)amino)-3-oxo-2-(2-(4,7,10-tris(2-(tert-butoxy)-2-oxoethyl)-1,4,7,10-tetraazacyclododecan-1-yl)acetamide)propane-1-sulfonic acid (0.719 mg), and DIEA (187 μL), followed by stirring for 2 hours at room temperature. Then, water (50 mL) was added thereto, followed by stirring. The generated solid was collected by filtration and purified by silica gel column chromatography (hexane/ethyl acetate=25/75 to 0/100 and then ethyl acetate/methanol=70/30)), thereby obtaining (R)-3-((2-(4-(4-(N—((S)-1-(tert-butoxy)-3-(5-(8-(tert-butoxycarbonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)-1-oxopropan-2-yl)sulfamoyl)-3,5-dimethylphenoxy)butanamide)ethyl)amino)-3-oxo-2-(2-(4,7,10-tris(2-(tert-butoxy)-2-oxoethyl)-1,4,7,10-tetraazacyclododecan-1-yl)acetamide)propane-1-sulfonic acid (381 mg) as a white amorphous solid.
LC/MS rt (min): 1.27
MS (ESI, m/z): 1495 [M+H]+
TFA/triethylsilane (1/1) (2 mL) were added to a chloroform (1 mL) suspension of (R)-3-((2-(4-(4-(N—((S)-1-(tert-butoxy)-3-(5-(8-(tert-butoxy carbonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)-1-oxopropan-2-yl)sulfamoyl)-3,5-dimethylphenoxy)butanamide)ethyl)amino)-3-oxo-2-(2-(4,7,10-tris(2-(tert-butoxy)-2-oxoethyl)-1,4,7,10-tetraazacyclododecan-1-yl)acetamide)propane-1-sulfonic acid (250 mg), followed by stirring for 4 hours at room temperature. The solvent was distilled away under reduced pressure, and an operation of adding acetonitrile (1 mL) to the obtained residue and distilling away the solvent under reduced pressure was repeated twice. The obtained residue was purified using a reversed-phase silica gel column (Sen-Pak C18. Waters), water/methanol=100/0 to 60/40), thereby obtaining the compound A (109.9 mg) as a white solid.
LC/MS rt (min): 0.75
MS (ESI, m/z): 1170.4 [M+H]+
1H-NMR (D2O) a: 7.49 (1H, d, J=7.3 Hz), 6.71 (2H, s), 6.50 (1H, d, J=7.3 Hz), 4.67 (1H, dd, J=7.9, 5.0 Hz), 4.00 (2H, t, J=5.9 Hz), 3.93-3.02 (34H, m), 2.72 (2H, t, J=6.1 Hz), 2.59 (2H, t, J=7.3 Hz), 2.34 (2H, t, J=7.3 Hz), 2.12-1.80 (6H, m), 1.62-1.38 (4H, m)
In an ice bath, HBTU (82 mg) was added to a mixture of (S)-4-(4-(N-(1-(tert-butoxy)-1-oxo-3-(5-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)-pentanamide)propan-2-yl)sulfamoyl)-3,5-dimethylphenoxy)butanoic acid (140 mg), (R)-3-((2-aminoethyl)amino)-3-oxo-2-((R)-3-sulfo-2-(2-(4,7,10-tris(2-(tert-butoxy)-2-oxoethyl)-1,4,7,10-tetraazacyclododecan-1-yl)acetamide)propanamide)propane-1-sulfonic acid (189 mg), DIEA (0.076 mL), and DMF (3.0 mL), followed by stirring for 1 hour at room temperature. Water (0.1 mL) was added to the reaction mixture, and the solvent was distilled away under reduced pressure. By adding acetonitrile (4 mL) and an aqueous saturated sodium chloride solution (1.5 mL) to the residue, the organic layer was fractionated, and the aqueous layer was extracted twice by using acetonitrile (3 mL). The solvent of the organic layer was distilled away under reduced pressure, and the residue was purified by silica gel column chromatography (diol silica gel (Purif-Pack DIOL 60-m, Shoko Scientific Co., Ltd.), hexane/ethyl acetate=50/50 to 0/100, chloroform/ethanol=100/0 to 80/20), thereby obtaining (R)-3-((2-(4-(4-(N—((S)-1-(tert-butoxy)-1-oxo-3-(5-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propan-2-yl)sulfamoyl)-3,5-dimethylphenoxy)butanamide)ethyl)amino)-3-oxo-2-((R)-3-sulfo-2-(2-(4,7,10-tris(2-(tert-butoxy)-2-oxoethyl)-1,4,7,10-tetraazacyclododecan-1-yl)acetamide)propanamide)propane-1-sulfonic acid (296 mg) as a white amorphous solid.
MS (ESI, m/z): 1545 [M+H]+
1H-NMR (D2O) δ: 7.35 (1H, d, J=7.3 Hz), 6.80 (2H, s), 6.52 (1H, d, J=7.3 Hz), 4.63-4.58 (1H, m), 4.10-4.02 (2H, m), 3.92-3.83 (1H, m), 3.75-2.95 (33H, m), 2.70 (2H, t, J=6.1 Hz), 2.55 (6H, s), 2.36 (2H, t, J=7.3 Hz), 2.17-2.08 (2H, m), 2.07-1.98 (2H, m), 1.90 (9H, s), 1.88-1.81 (2H, m), 1.58-1.12 (37H, m)
6 mol/L hydrochloric acid (1 mL) cooled to 0° C. was added to (R)-3-((2-(4-(4-(N—((S)-1-(tert-butoxy)-1-oxo-3-(5-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propan-2-yl)sulfamoyl)-3,5-dimethylphenoxy)butanamide)ethyl)amino)-3-oxo-2-((R)-3-sulfo-2-(2-(4,7,10-tris(2-(tert-butoxy)-2-oxoethyl)-1,4,7,10-tetraazacyclododecan-1-yl)acetamide)propanamide)propane-1-sulfonic acid (262 mg), followed by stirring for 12.5 hours at room temperature. The mixture was cooled in an ice bath, and then a 5 mol/L aqueous sodium hydroxide solution (1 mL) was added thereto for 10 minutes in a state where the internal temperature was being kept to be equal to or lower than 13° C. Then, sodium acetate trihydrate (172 mg) was added thereto. A reversed-phase silica gel column (Sep-Pak C18, Waters) was charged with the obtained reaction mixture, and elution was performed under a normal pressure by using 0.1% formic acid-containing water (12 mL), 0.1% formic acid-5% acetonitrile-containing water (6 mL), 0.1% formic acid-10% acetonitrile-containing water (6 mL), 0.1% formic acid-15% acetonitrile-containing water (6 mL), 0.1% formic acid-20% acetonitrile-containing water (6 mL), 0.1% formic acid-25% acetonitrile-containing water (6 mL), 0.1% formic acid-30% acetonitrile-containing water (6 mL), 0.1% formic acid-35% acetonitrile-containing water (6 mL), and 0.1% formic acid-40% acetonitrile-containing water (6 mL) in this order, and the solvent was distilled away under reduced pressure, thereby obtaining 2,2′,2″-(10-((4R,7R)-16-(4-(N—((S)-1-carboxy-2-(5-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)ethyl)sulfamoyl)-3,5-dimethylphenoxy)-2,5,8,13-tetraoxo-4,7-bis(sulfomethyl)-3,6,9,12-tetraazahexadecyl)-1,4,7,10-tetraacacyclododecane-1,4,7-triyl)triacetic acid (159 mg) as a colorless solid.
MS (ESI, m/z): 1321 [M+H]+
1H-NMR (D2O) δ: 7.52 (1H, d, J=7.3 Hz), 6.76 (2H, s), 6.53 (1H, d, J=7.3 Hz), 4.68-4.61 (1H, m), 4.04 (2H, t, J=6.1 Hz), 3.99-3.10 (38H, m), 2.74 (2H, t, J=6.1 Hz), 2.61 (2H, t, J=7.4 Hz), 2.54 (6H, s), 2.33 (2H, t, J=7.3 Hz), 1.95 (6H, ddt, J=42.9, 19.8, 6.6 Hz), 1.60-1.35 (4H, m)
(R)-3-((2-aminoethyl)amino)-3-oxo-2-(2-(4,7,10-tris(2-(tert-butoxy)-2-oxoethyl)-1,4,7,10-tetraazacyclododecan-1-yl)acetamide)propane-1-sulfonic acid (143 mg) and diisopropylethylamine (66.3 μL) were added to a reaction mixture containing (S)-4-(4-(N-(1-(tert-butoxy)-1-oxo-3-(5-(8-((2,2,5,7,8-pentamethylchroman-6-yl)sulfonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propan-2-yl)sulfamoyl)-3,5-dimethylphenoxy)butanoic acid obtained in (3) of Reference Example 3, followed by stirring for 20 minutes at room temperature. Then, HBTU (70.9 mg) was added thereto, followed by stirring for 21 hours at room temperature. Thereafter, water was added to the reaction solution, followed by stirring for 3 hours. The aqueous layer was removed by a decantation operation, and then water was added thereto so as to make a suspension with stirring, and the solid was collected by filtration. The solid was purified by silica gel column chromatography (chloroform/methanol), thereby obtaining (R)-3-((2-(4-(4-(N—((S)-1-(tert-butoxy)-1-oxo-3-(5-(8-((2.2.5.7.8-pentamethylchroman-6-yl)sulfonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propan-2-yl)sulfamoyl)-3,5-dimethylphenoxyl)butanamide)ethyl)amino)-3-oxo-2-(2-(4,7,10-tris(2-(tert-butoxy)-2-oxoethyl)-1,4,7,10-tetraazacyclododecan-1-yl)acetamide)propane-1-sulfonic acid (83.0 mg) as a white solid.
LC/MS rt (min): 1.75
MS (ESI, m/z): 1662.1 [M+H]+
1H-NMR (CDCl3) δ: 8.60-8.48 (m, 1H), 7.72-7.54 (m, 1H), 7.18 (d, 1H, J=7.6 Hz), 6.66 (s, 2H), 6.56 (d, 1H, J=7.6 Hz), 6.18-6.07 (m, 1H), 5.79-5.69 (m, 1H), 4.81-4.69 (m, 1H), 4.12-2.47 (m, 45H), 2.42-2.28 (m, 4H), 2.14-1.12 (m, 67H)
A mixed solution of trifluoroacetic acid (0.4 mL) and triethylsilane (19.2 μL) was added to (R)-3-((2-(4-(4-(N—((S)-1-(tert-butoxy)-1-oxo-3-(5-(8-((2,2,5,7,8-pentamethylchroman-6-yl)sulfonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propan-2-yl)sulfamoyl)-3,5-dimethylphenoxyl)butanamide)ethyl)amino)-3-oxo-2-(2-(4,7,10-tris(2-(tert-butoxy)-2-oxoethyl)-1,4,7,10-tetraazacyclododecan-1-yl)acetamide)propane-1-sulfonic acid (20 mg), followed by stirring for 24 hours at room temperature. Then the solvent was distilled away under reduced pressure. TBME (5 mL) was added to the obtained residue, the solid was collected by filtration, thereby obtaining TFA (21.4 mg) of the compound A was obtained as a white solid.
LC/MS rt (min): 0.70
MS (ESI, m/z): 1170.9 [M+H]+, 1168.9 [M−H]−
By the same method as in (1) of Example 4, a reaction mixture containing (S)-4-(4-(N-(1-(tert-butoxy)-1-oxo-3-(5-(8-((2,2,4,6,7-pentamethyl-2,3-dihydrobenzofuran-5-yl)sulfonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propan-2-yl)sulfamoyl)-3,5-dimethylphenoxy)butanoic acid obtained in (3) of Reference Example 4 was reacted with (R)-3-((2-aminoethyl)amino)-3-oxo-2-(2-(4,7,10-tris(2-(tert-butoxy)-2-oxoethyl)-1,4,7,10-tetraazacyclododecan-1-yl)acetamide)propane-1-sulfonic acid (21.3 mg), thereby obtaining (R)-3-((2-(4-(4-(N—((S)-1-(tert-butoxy)-1-oxo-3-(5-(8-((2,2,4,6,7-pentamethyl-2,3-dihydrobenzofuran-5-yl)sulfonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propan-2-yl)sulfamoyl)-3,5-dimethylphenoxy)butanamide)ethyl)amino)-3-oxo-2-(2-(4,7,10-tris(2-(tert-butoxy)-2-oxoethyl)-1,4,7,10-tetraazacyclododecan-1l-yl)acetamide)propane-1-sulfonic acid as a white solid (56.2 mg).
LC/MS rt (min): 1.68
MS (ESI, m/z): 1648.1 [M+H]+
1H-NMR (CDCl3) δ: 8.59-8.46 (m, 1H), 7.74-7.64 (m, 1H), 7.59-7.46 (m, 1H), 7.19 (d, 1H, J=7.6 Hz), 6.66 (s, 2H), 6.58 (d, 1H, J=7.6 Hz), 6.17-6.06 (m, 1H), 5.77-5.67 (m, 1H), 4.81-4.70 (m, 1H), 4.12-2.79 (m, 30H), 2.74 (t, 2H, J=6.3 Hz), 2.61 (s, 6H), 2.56 (s, 3H), 2.50 (s, 3H), 2.44-2.30 (m, 4H), 2.14-1.19 (m, 65H)
A mixed solution of trifluoroacetic acid (0.4 mL) and triethylsilane (19.2 μL) was added to (R)-3-((2-(4-(4-(N—((S)-1-(tert-butoxy)-1-oxo-3-(5-(8-((2,2,4,6,7-pentamethyl-2,3-dihydrobenzofuran-5-yl)sulfonyl)-5,6,7, 8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propan-2-yl)sulfamoyl)-3,5-dimethylphenoxy)butanamide)ethyl)amino)-3-oxo-2-(2-(4,7,10-tris(2-(tert-butoxy)-2-oxoethyl)-1,4,7,10-tetraazacyclododecan-1-yl)acetamide)propane-1-sulfonic acid (10 mg), followed by stirring for 24 hours at room temperature. Then, the solvent was distilled away under reduced pressure. TBME (5 mL) was added to the obtained residue, the solid was collected by filtration, thereby obtaining TFA (8.2 mg) of the compound A as a white solid.
LC/MS rt (min): 0.70
MS (ESI, m/z): 1170.9 [M+H]+, 1168.9 [M−H]−
HBTU (18.3 g) was added to a mixture of (R)-3-((2-aminoethyl)amino)-2-((R)-4-(4,7-bis(2-(tert-butoxy)-2-oxoethyl)-1,4,7-triazonan-1-yl)-5-(tert-butoxy)-5-oxopentanamide)-3-oxopropane-1-sulfonic acid (29.5 g), DMAc (150 mL), DIEA (17.4 mL), and (S)-4-(4-(N-(1-(tert-butoxy)-1-oxo-3-(5-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propan-2-yl)sulfamoyl)-3,5-dimethylphenoxy)butanoic acid (23.3 g), followed by stirring for 1.5 hours at room temperature. The reaction solution was added dropwise to an aqueous saturated ammonium chloride solution (600 mL) cooled to 6° C., followed by stirring for 10 minutes. The supernatant was removed, and then water (600 mL) was added to the residue, followed by stirring for 10 minutes. Thereafter, the supernatant was removed again, the obtained viscous solid was dissolved in ethanol/chloroform (20/1) (100 mL) and then concentrated under reduced pressure. Water was removed by repeating twice an operation of adding ethanol (100 mL) to the residue and concentrating the solvent under reduced pressure, and then the residue was purified by silica gel column chromatography (NH silica (NH-Sil, Biotage), chloroform/methanol=100/0 to 70/30 to 20/80), thereby obtaining (R)-2-((R)-4-(4,7-bis(2-(tert-butoxy)-2-oxoethyl)-1,4,7-triazonan-1-yl)-5-(tert-butoxy)-5-oxopentanamide)-3-((2-(4-(4-(N—((S)-1-(tert-butoxy)-1-oxo-3-(5-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propan-2-yl)sulfamoyl)-3,5-dimethylphenoxy)butanamide)ethyl)amino)-3-oxopropane-1-sulfonic acid (27.7 g) as a white solid.
LC/MS rt (min): 1.40
MS (ESI, m/z): 1365 [M+H]+
1H-NMR (CDCl3, 300 MHz) a: 7.61 (1H, brs), 7.33 (1H, brs), 7.23 (1H, brs), 6.65 (2H, s), 6.52 (1H, brs), 6.36 (1H, d, J=7.3 Hz), 4.71 (1H, m), 3.98 (2H, t, J=6.3 Hz), 3.87 (1H, brs), 3.60-1.53 (57H, m), 1.49-1.42 (27H, m), 1.34 (9H, s) HPLC (Waters BEH C18, formic acid-based, gradient cycle: 0 min (A solution/B solution=30/70), 10 min (A solution/B solution=0/100), 12 min (A solution/B solution=0/100), flow rate: 0.4 mL/min)) rt (min): 4.81
6 mol/L hydrochloric acid (300 mL) was added to (R)-2-((R)-4-(4,7-bis(2-(tert-butoxy)-2-oxoethyl)-1,4,7-triazonan-1-yl)-5-(tert-butoxy)-5-oxopentanamide)-3-((2-(4-(4-(N—((S)-1-(tert-butoxy)-1-oxo-3-(5-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propan-2-yl)sulfamoyl)-3,5-dimethylphenoxy)butanamide)ethyl)amino)-3-oxopropane-1-sulfonic acid (15.1 g), followed by stirring for 14 hours at room temperature. The mixture was cooled in an ice bath, and then a 5 mol/L aqueous sodium hydroxide solution (300 mL) was added thereto for 1 hour and 20 minutes in a state where the internal temperature was being controlled to become equal to or lower than 13° C. Thereafter, anhydrous sodium acetate (49.5 g) was added thereto, and the pH of the reaction solution was adjusted to be 4.07. A reversed-phase silica gel column (inner diameter of glass column: 10.5 cm, Daisogel-SR120-40/60-ODS-RPS: 315 g) was charged with the obtained reaction mixture, and elution was performed under a normal pressure by using water (600 mL), 10% acetonitrile-containing water (600 mL), and 30% acetonitrile-containing water (1,800 mL) in this order. A fraction containing 2,2′-(7-((R)-1-carboxy-4-(((R)-1-((2-(4-(4-(N—((S)-1-carboxy-2-(5-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)ethyl)sulfamoyl)-3,5-dimethylphenoxy)butanamide)ethyl)amino)-1-oxo-3-sulfopropan-2-yl)amino)-4-oxobutyl)-1,4,7,-triazonane-1,4-diyl)diacetic acid was combined, and the solvent was distilled away under reduced pressure. Water (100 mL) was added to the obtained residue, and while the solution was being stirred with ice cooling, lithium carbonate (1.38 g) was added thereto in four divided portions such that the pH of the reaction solution was adjusted to be 8.10. Thereafter, a reversed-phase silica gel column (inner diameter of glass column: 10.5 cm, Daisogel-SR120-40/60-ODS-RPS: 315 g) was charged with the reaction solution, elution was performed under a normal pressure by using water (600 mL), 5% acetonitrile-containing water (600 mL), 10% acetonitrile-containing water (600 mL), 15% acetonitrile-containing water (600 mL), 20% acetonitrile-containing water (600 mL), and 25% acetonitrile-containing water (600 mL) in this order, and a fraction containing a lithium salt of 2,2′-(7-((R)-1-carboxy-4-(((R)-1-((2-(4-(4-(N—((S)-1-carboxy-2-(5-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)ethyl)sulfamoyl)-3,5-dimethylphenoxy)butanamide)ethyl)amino)-1-oxo-3-sulfopropan-2-yl)amino)-4-oxobutyl)-1,4,7-triazonane-1,4-diyl)diacetic acid was concentrated under reduced pressure. Water (100 mL) was added to the solution, and formic acid (2.79 mL) was added thereto with stirring in an ice bath. A reversed-phase silica gel column (inner diameter of glass column: 6.5 cm, Daisogel-SR120-40/60-ODS-RPS: 150 g) was charged with the obtained mixture, and elution was performed under a normal pressure by using a 0.1% aqueous formic acid solution (300 mL), water (300 mL), 30% acetonitrile-containing water (300 mL), 40% acetonitrile-containing water (300 mL), and 50% acetonitrile-containing water (300 mL) in this order. A fraction containing 2,2′-(7-((R)-1-carboxy-4-(((R)-1-((2-(4-(4-(N—((S)-1-carboxy-2-(5-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)ethyl)sulfamoyl)-3,5-dimethylphenoxy)butanamide)ethyl)amino)-1-oxo-3-sulfopropan-2-yl)amino)-4-oxobutyl)-1,4,7-triazonane-1,4-diyl)diacetic acid was collected, and the solvent was distilled away under reduced pressure. Water (150 mL) was added to the obtained residue, and then the solution was freeze-dried, thereby obtaining 2,2′-(7-((R)-1-carboxy-4-(((R)-1-((2-(4-(4-(N—((S)-carboxy-2-(5-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)ethyl)sulfamoyl)-3,5-dimethylphenoxy)butanamide)ethyl)amino)-1-oxo-3-sulfopropan-2-yl)amino)-4-oxobutyl)-1,4,7-triazonane-1,4-diyl)diacetic acid (8.93 g) as a white solid.
LC/MS rt (min): 0.76
MS (ESI, m/z): 1141 [M+H]+
1H-NMR (D2O, 300 MHz) δ: 7.51 (1H, d, J=7.5 Hz), 6.75 (2H, s), 6.53 (1H, d, J=7.5 Hz), 4.65 (1H, dd, J=7.9, 5.0 Hz), 4.03 (2H, t, J=5.9 Hz), 3.91 (1H, dd, J=9.2, 4.3 Hz), 3.74 (4H, s), 3.60-2.88 (24H, m), 2.73 (2H, t, J=5.9 Hz), 2.61 (2H, t, J=7.3 Hz), 2.53 (6H, s), 2.50-2.41 (1H, m), 2.32 (2H, t, J=7.4 Hz), 2.13-1.80 (8H, m), 1.62-1.37 (4H, m)
HPLC (GL Inertsustain C18, TFA-based, gradient cycle: 0 min (A solution/B solution=90/10), 20 min (A solution/B solution=75/25), 30 min (A solution/B solution=75/25), flow rate: 1.0 mL/min) rt (min): 9.80
DIEA (67 L1), (R)-3-((2-aminoethyl)emino)-2-((R)-4-(4,7-bis(2-(tert-butoxy)-2-oxoethyl)-1,4,7-triazonan-1-yl)-5-(tert-butoxy)-5-oxopentanamide)-3-oxopropane-1-sulfonic acid (140 mg), and HBTU (72 mg) were added to a reaction mixture containing (S)-4-(4-(N-(1-(tert-butoxy)-1-oxo-3-(5-(8-((2,2,4,6,7-pentamethyl-2,3-dihydrobenzofuran-5-yl)sulfonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propan-2-yl)sulfamoyl)-3,5-dimethylphenoxy)butanoic acid obtained in (3) of Reference Example 4, followed by stirring for 2.5 hours at room temperature. An aqueous saturated ammonium chloride solution (4 mL) was added to the reaction mixture, the supernatant was then removed, and the obtained viscous solid was purified by silica gel column chromatography (NH silica, chloroform/methanol=100/0 to 80/20 to 70/30 to 50/50), thereby obtaining (R)-2-((R)-4-(4,7-bis(2-(tert-butoxy)-2-oxoethyl)-1,4,7-triazonan-1-yl)-5-(tert-butoxy)-5-oxopentanamide)-3-((2-(4-(4-(N—((S)-1-(tert-butoxy)-1-oxo-3-(5-(8-((2,2,4,6,7-pentamethyl-2,3-dihydroxybenzofuran-5-yl)sulfonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propan-2-yl)sulfamoyl)-3,5-dimethylphenoxy)butanamide)ethyl)amino)-3-oxopropane-1-sulfonic acid (25 mg) as a white solid.
LC/MS rt (min): 1.90
MS (ESI, m/z): 1618 [M+H]+
1H-NMR (CDCl3, 300 MHz) δ: 7.95-7.31 (2H, m), 7.18 (1H, d, J=7.3 Hz), 6.65 (2H, s), 6.58 (1H, d, J=7.3 Hz), 6.11 (1H, s), 5.72 (1H, brs), 4.80 (1H, brs), 4.13-3.95 (4H, m), 3.75-2.24 (49H, m), 2.19-1.75 (12H, m), 1.54-1.16 (46H, m)
TFA (0.5 mL) was added to (R)-2-((R)-4-(4,7-bis(2-(tert-butoxy)-2-oxoethyl)-1,4,7-triazonan-1-yl)-5-(tert-butoxy)-5-oxopentanamide)-3-((2-(4-(4-(N—((S)-1-(tert-butoxy)-1-oxo-3-(5-(8-((2,2,4,6,7-pentamethyl-2,3-dihydroxybenzofuran-5-yl)sulfonyl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)propan-2-yl)sulfamoyl)-3.5-dimethylphenoxy)butanamide)ethyl)amino)-3-oxopropane-1-sulfonic acid (5 mg), followed by stirring for 6 hours at room temperature, and the solvent was distilled away. The residue was purified by preparative HPLC, thereby obtaining 2,2′-(7-((R)-1-carboxy-4-(((R)-1-((2-(4-(4-(N—((S)-1-carboxy-2-(5-(5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl)pentanamide)ethyl)sulfamoyl)-3,5-dimethylphenoxy)butanamide)ethyl)amino)-1-oxy-3-sulfopropan-2-yl)amino)-4-oxobutyl)-1,4,7-triazonane-1,4-diyl)diacetic acid (2 mg) as a white solid.
LC/MS rt (min): 0.75
MS (ESI, m/z): 1141 [M+H]+
In the present example, the compound A obtained in Example 1 and the compound B obtained in Example 6 were used.
(A)
A gallium [67Ga] chloride solution (200 MBq, 63 μL) was added to a mixed solution of the compound A (21 μg), gentisic acid (1.0 mg), a 0.2 mol/L sodium acetate buffer solution (pH 4.0, 730.7 μL), and 4.5 mol/L aqueous sodium hydroxide solution (6.3 μL). The solution was heated to 100° C. for 15 minutes and then left to stand for 5 minutes at room temperature, thereby obtaining [67Ga]-(compound A). As a result of analyzing the compound by using reversed-phase TLC (Merck, RP-8 F254S, developing solvent: methanol/0.5 mol/L aqueous ammonium acetate solution/28% aqueous ammonia (50/50/1), the Rf value of the radiolabeled compound was found to be 0.4. The radiochemical purity measured immediately after the compound was prepared and measured after 3.5 hours at room temperature was equal to or higher than 95%.
(B)
A lutetium [177Lu] chloride solution (666 MBq, 333 μL) dissolved in a 0.2 mol/L sodium acetate buffer solution (pH 4.0) was added to a mixed solution of the compound A (70.0 μg), gentisic acid (1.8 mg), and a 0.2 mol/L sodium acetate buffer solution (pH 4.0, 83.3 μL). The solution was heated to 100° C. for 15 minutes and then left to stand for 5 minutes at room temperature, thereby obtaining [177Lu]-(compound A). As a result of analyzing the compound by using reversed-phase TLC (Merck, RP-8 F254S, developing solvent: methanol/0.5 mol/L aqueous ammonium acetate solution/28% aqueous ammonia (50/50/1), the Rf value of the radiolabeled compound was found to be 0.4. The radiochemical purity measured immediately after the compound was prepared and measured after 3 hours at room temperature was equal to or higher than 95%.
(C)
A gallium [67Ga] chloride solution (40 MBq, 11.7 μL) was added to a mixed solution of the compound B (4.1 μg), gentisic acid (1.0 mg), a 0.2 mol/L sodium acetate buffer solution (pH 4.5, 147.13 μL), and 4.5 mol/L aqueous sodium hydroxide solution (1.17 μL). The solution was heated to 100° C. for 15 minutes and then left to stand for 5 minutes at room temperature, thereby obtaining [67Ga]-(compound B). As a result of analyzing the compound by using reversed-phase TLC (Merck, RP-8 F254S, developing solvent: methanol/0.5 mol/L aqueous ammonium acetate solution/28% aqueous ammonia (50/50/1), the Rf value of the radiolabeled compound was found to be 0.5. The radiochemical purity measured immediately after the compound was prepared and measured after 5.5 hours at room temperature was equal to or higher than 95%.
In the following Test Examples 1 to 9, the compound A obtained in Reference Example 8 and the compound B obtained in Reference Example 9 were used.
0.2 μg/mL of δvβ3 was immobilized in a 96-well plates (Corning Incorporated) and then blocked using a 1% Block Ace (DS Pharma Biomedical Co., Ltd.) solution, and then the plate was washed with T-PBS (PBS containing 0.05% Tween 20). A 2× concentrated evaluation compound solution (10× concentration of 3.16× dilution from 0.3 μmol/L, buffer (20 mM Tris-HCl pH 7.5, 150 mM NaCl, 1 mM CaCl2), 1 mM MgCl2, 1 mM MnCl2)) and a 4 μg/mL biotinylated vitronectin solution (labeling vitronectin (Upstate Biotechnology Inc.) by using EZ-Link Sulfo-NHS-Biotinylation Kit (Pierce Protein Biology) and then adjusting concentration) were each added to the plate in an amount of 50 μL, and the plate was shaken for 2 hours at room temperature. The plate was washed with T-PBS, a 0.2 μg/mL avidin·peroxidase (Pierce Protein Biology) was added thereto, and the plate was shaken for 1 hour at room temperature. The plate was washed with T-PBS, an o-phenylenediamine (Sigma-Aldrich Co., LLC.) solution was added thereto such that color was produced (stopped using 4 mol/L sulfuric acid), and the absorbance (490 nm, Reference: 595 nm) was measured. The IC50 value was calculated using XLfit 3.0 (ID Business Solutions Ltd.). For each plate, as a QC sample, RGDfV (Bachem AG) was measured in duplicate.
0.2 μg/mL of δvβ5 was immobilized in a 96-well plates (Corning Incorporated) and then blocked using a 1% Block Ace (DS Pharma Biomedical Co., Ltd.) solution, and then the plate was washed with PBST (10 mM Na2HPO4 pH 7.5, 150 mM NaCl, 0.01% Tween 20). A 2× concentrated evaluation compound solution (10× concentration of 3.16× dilution from 0.3 mol/L, buffer (20 mM Tris-HCl pH 7.5, 150 mM NaCl, 1 mM CaCl2), 1 mM MgCl2, 1 mM MnCl2)) and a 4 μg/mL biotinylated vitronectin solution (labeling vitronectin (Upstate Biotechnology Inc.) by using EZ-Link Sulfo-NHS-Biotinylation Kit (Pierce Protein Biology) and then adjusting concentration) were each added to the plate in an amount of 50 μL, and the plate was shaken for 2 hours at room temperature. The plate was washed with PBST, a 0.2 g/mL avidin-peroxidase (Pierce Protein Biology) was added thereto, and the plate was shaken for 1 hour at room temperature. The plate was washed with PBST, an o-phenylenediamine (Sigma-Aldrich Co., LLC.) solution was added thereto such that color was produced (stopped using 4 mol/L sulfuric acid), and the absorbance (490 nm, Reference: 595 nm) was measured. The IC50 value was calculated using XLfit 3.0 (ID Business Solutions Ltd.). For each plate, as a QC sample, RGDfV (Bachem AG) was measured in duplicate.
As the evaluation compounds of Test Examples 1 and 2, the compound A and the compound B were used. The results are shown below.
The compounds in Table 2 exhibited excellent integrin binding affinity.
Test Example 3 Evaluation based on radioactivity concentration of 111In-labeled compound, 64Cu-labeled compound, and 90Y-labeled compound in tumor
1×107 U87MG cells were transplanted into the subcutaneous space of the right flank of Balb/c AJcl-nu/nu (6 to 9-week-old, KURARAY CO., LTD. or Japan SLC. Inc). After 2 to 3 weeks, at a point in time when the tumor volume became 200 to 500 mm3, 3 mice were sorted into one group at each point in time. The 111In-labeled compound (740 k Bq) was administered into the caudal vein, the animals were sacrificed after a certain period of time, and the tumor was extracted. The weight of the tumor was measured, the radioactivity was measured using a gamma counter, and the radioactivity concentration in tumor (% ID/g) was calculated. For the 64Cu-labeled compound (500 k Bq) and the 90Y-labeled compound (500 k Bq), the radioactivity concentration in tumor (% ID/g) was calculated by the same method. The results are shown below.
The radioactivity concentration of the compounds in Table 3 reached 9.25 to 12.52% ID/g in the tumor within 4 hours after administration and reached 8.48 to 15.29% ID/g within 24 hours after administration.
1×107 U87MG cells were transplanted into the subcutaneous space of the right flank of Balb/c AJcl-nu/nu (males, 6 to 9-week-old, KURARAY CO., LTD. or Japan SLC. Inc). After 2 weeks, [64Cu]-(compound A) was administered at 4.8 MBq/mouse into the caudal vein of the mice with a tumor having a volume of 250 mm to 650 mm3. After 1, 4, 24, and 48 hours, the mice were imaged by microPET/CT (Inveon, Siemens Healthcare GmbH) under isoflurane anesthesia. 48 hours after imaging, whole blood was collected from the postcava under deep isoflurane anesthesia, the animals were euthanised, and then the tumor was extracted. The weight of the tumor was measured, the radioactivity was measured using a gamma counter, and the radioactivity concentration in tumor (% ID/g) was calculated. For [64Cu]-(compound B), imaging was performed by the same method.
1×107 U87MG cells were transplanted into the subcutaneous space of the right flank of Balb/c AJcl-nu/nu (males, 6-week-old, KURARAY CO., LTD). After 2 weeks, a [111In]-(compound A) solution was administered at 1 MBq/mouse into the caudal vein of the mice with a tumor having a volume of 300 mm to 600 mm3. 24, 48, and 72 hours after administration, planar imaging was performed under isoflurane anesthesia by using a gamma camera (Symbia, Siemens Healthcare GmbH). Through image analysis, the radioactivity (% ID) of the tumor was calculated.
1×107 U87MG cells were transplanted into the cranium of Balb/c AJcl-nu/nu (males, 6-week-old, KURARAY CO., LTD) by using a two-stage needle. After 2 to 4 weeks, a [111In]-(compound A) solution was administered at 1 MBq/mouse into the caudal vein of the mice. 24, 48, and 72 hours after administration, planar imaging was performed under isoflurane anesthesia by using a gamma camera (Symbia, Siemens Healthcare GmbH) (
1×107 U87MG cells were transplanted into the subcutaneous space of the right flank of Balb/c Slc-nu/nu (males, 6-week-old, Japan SLC. Inc). After 2 weeks, the mice with a tumor having a volume of 100 to 500 mm3 were grouped. A phosphate buffered saline (PBS) or [90Y]-(compound A) was administered into the caudal vein, and the tumor volume was measured. At a point in time when the tumor volume of the mice of the PBS group exceeded 2,000 mm3 which is a humane endpoint, the antitumor activity was evaluated. As evaluation values, a tumor growth inhibition rate ((1−(average tumor volume of group administered with compound−average tumor volume of group administered with compound before administration)/(average tumor volume of PBS group−average tumor volume of PBS group before administration))×100 (here, in a case where the inhibition rate exceeded 100%, the inhibition rate was regarded as being 100%)) and the number of individuals with a tumor having a volume of equal to or less than the initial tumor volume (number of animals showing regression).
The results are shown below.
The compound in Table 4 demonstrated excellent antitumor activity.
A mixture obtained by mixing T98G cell suspension (human glioblastoma, 1×107 cells) with MATRIGEL (BD Biosciences, Japan) in an equal amount was transplanted into the subcutaneous space of the right flank of Balb/c Slc-nu/nu (males, 6-week-old, Japan SLC. Inc). After 77 days, at a point in time when the tumor volume reached 300 to 1,200 mm3, the mice were grouped. A phosphate buffered saline (PBS) or [90Y]-(P2) was administered into the caudal vein, and the tumor volume was measured. The evaluation values were calculated by the same method as in Test Example 7, and the antitumor activity was evaluated.
The results are shown below.
The compound in Table 5 demonstrated excellent antitumor activity.
Blood was collected from a crab-eating macaque over time, and by using [111In]-(compound A), from the radioactivity concentration in the blood, kinetic parameters of the compound in blood were calculated by OLINDA/EXM 1.0. Furthermore, by using [111In]-(compound A), from the organ distribution obtained by imaging, the absorbed dose of each organ obtained in a case where the compound is administered to a human being was calculated using OLINDA/EXM 1.0. [111In]-(compound A) (98 MBq/9.3 μg) was administered to a crab-eating macaque (Hamri Co., Ltd., males, 3-year-old, 3.4 kg) under anesthesia. After the administration, blood was collected over time, and imaging was performed using a gamma camera. The blood was collected 10, 30, and 60 minutes after the administration and 2, 4, 5, 6, 24, 48, 72, and 144 hours after the administration. Regarding the imaging, after 1, 2, 4, 6, 24, 48, 72, and 144 hours, planar imaging was performed using a gamma camera (Symbia, Siemens Healthcare GmbH). Regarding the anesthesia, the animal was anesthetized with ketamine at 20 mg/kg before the administration of [111In]-(compound A) and kept anesthetized until the end of imaging, which was continued for 6 hours after the administration, by inhalation anesthesia (isofluran 2 to 3%, 5 to 8 L/min). After 24 hours, ketamine (20 mg/kg) and xylazine (2 mg/kg) were administered to perform blood collection and imaging.
AUC was 0.22 (% ID·h/mL), T1/2α was 0.46 (h), T1/2β was 19.3 (h), Cmax was 0.018 (% ID/mL), CL was 130.2 (mL/h/kg), and Vss was 3.52 (L/kg).
The manufacturing method of the present invention is a useful as a method for manufacturing a novel nitrogen-containing compound or a salt thereof. Furthermore, the manufacturing intermediate of the present invention is useful as an intermediate for efficiently manufacturing a novel nitrogen-containing compound and a salt thereof
| Number | Date | Country | Kind |
|---|---|---|---|
| 2015-062306 | Mar 2015 | JP | national |
This application is a Continuation of U.S. application Ser. No. 17/037,103, filed Sep. 29, 2020, which is a Divisional of U.S. application Ser. No. 15/712,815, filed Sep. 22, 2017, which is a Continuation of National Phase of PCT International Application PCT/JP2016/059729 filed on Mar. 25, 2016, which claims priority under 35 U.S.C 119(a) to Japanese Patent Application No. 2015-062306 filed on Mar. 25, 2015. Each of the above applications is hereby expressly incorporated by reference, in its entirety, into the present application.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 15712815 | Sep 2017 | US |
| Child | 17037103 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 17037103 | Sep 2020 | US |
| Child | 18112423 | US | |
| Parent | PCT/JP2016/059729 | Mar 2016 | US |
| Child | 15712815 | US |
