US20150329540A1 - Oct3 activity inhibitor containing imidazopyridine derivative as active component, and oct3 detection agent - Google Patents

Oct3 activity inhibitor containing imidazopyridine derivative as active component, and oct3 detection agent Download PDF

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US20150329540A1
US20150329540A1 US14/655,729 US201314655729A US2015329540A1 US 20150329540 A1 US20150329540 A1 US 20150329540A1 US 201314655729 A US201314655729 A US 201314655729A US 2015329540 A1 US2015329540 A1 US 2015329540A1
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group
substituent
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oct3
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Hidetoshi Yamashita
Nobuyuki Suzuki
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Shin Nippon Biomedical Laboratories Ltd
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/435—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with one nitrogen as the only ring hetero atom
    • A61K31/4353—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with one nitrogen as the only ring hetero atom ortho- or peri-condensed with heterocyclic ring systems
    • A61K31/437—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with one nitrogen as the only ring hetero atom ortho- or peri-condensed with heterocyclic ring systems the heterocyclic ring system containing a five-membered ring having nitrogen as a ring hetero atom, e.g. indolizine, beta-carboline
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/435—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with one nitrogen as the only ring hetero atom
    • A61K31/44—Non condensed pyridines; Hydrogenated derivatives thereof
    • A61K31/4427—Non condensed pyridines; Hydrogenated derivatives thereof containing further heterocyclic ring systems
    • A61K31/444—Non condensed pyridines; Hydrogenated derivatives thereof containing further heterocyclic ring systems containing a six-membered ring with nitrogen as a ring heteroatom, e.g. amrinone
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/435—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with one nitrogen as the only ring hetero atom
    • A61K31/44—Non condensed pyridines; Hydrogenated derivatives thereof
    • A61K31/445—Non condensed piperidines, e.g. piperocaine
    • A61K31/4453—Non condensed piperidines, e.g. piperocaine only substituted in position 1, e.g. propipocaine, diperodon
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
    • A61K31/496—Non-condensed piperazines containing further heterocyclic rings, e.g. rifampin, thiothixene or sparfloxacin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P25/00—Drugs for disorders of the nervous system
    • A61P25/24—Antidepressants
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D471/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00
    • C07D471/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00 in which the condensed system contains two hetero rings
    • C07D471/04—Ortho-condensed systems

Definitions

  • the present invention relates to an organic cation transporter 3 (OCT3) activity inhibitor containing an imidazopyridine derivative as an active component, and an OCT3 detection agent.
  • OCT3 organic cation transporter 3
  • Various pharmaceutical agents are used in a drug therapy. Some of these agents become positive ions (cations) under biological conditions. Recently, a study of a transporter (transport protein), which exists in a cell membrane and contributes to migration of a pharmaceutical agent to a tissue, absorption thereof, renal excretion thereof and biliary excretion thereof by transporting the pharmaceutical agent actively, has been significantly advanced.
  • a transporter transport protein
  • an organic cation transporter is important to transport a cationic pharmaceutical agent.
  • OCT3 exists not only in the placenta, but also in the kidneys, the small intestine, the lungs, the heart, and the brain.
  • a nucleoside derivative, a quinoline derivative, and a compound having a tricyclic structure have been reported as OCT3 activity inhibitors. However, it is difficult to use these compounds as drugs because of side effects etc. thereof.
  • a guanidine derivative has been reported as the OCT3 activity inhibitor (Non Patent Literature 1 described below). However, it has been reported that IC 50 s of famotidine and cimetidine (histamine H2 receptor antagonists) are 20 ⁇ M and 240 ⁇ M, respectively, and that IC 50 s of ramosetron and granisetron (setron-based compounds) are both 100 ⁇ M or less.
  • Patent Literature 1 discloses a therapeutic agent for mental disorder, containing a substance suppressing expression of an organic cation transporter OCT3 gene as an active component.
  • US 2007/0136828 discloses a therapeutic agent for depression by inhibiting a function of the OCT3, containing an antisense nucleic acid of the OCT3 gene.
  • Patent Literature 3 discloses a therapeutic agent for depression by inhibiting a function of the OCT3, containing an alkylamine-catechol derivative, a quinoline derivative, and a bis-quinoline derivative as active components.
  • Patent Literature 4 discloses a therapeutic agent for depression and symptoms suggesting depression, containing famotidine as an active component.
  • U.S. Pat. No. 6,403,645 discloses a therapeutic agent for depression, containing a transporter Uptake2 (OCT and PMAT) inhibitor as an active component.
  • Zolpidem is a therapeutic agent for insomnia, which acts on a ⁇ 1-type GABA A receptor.
  • Alpidem registered trademark
  • Zolimidin registered trademark
  • Olprinone registered trademark
  • An object of the present invention is to provide an OCT3 activity inhibitor having a different basic structure from the OCT3 activity inhibitor in the related art.
  • Another object of the present invention is to provide a therapeutic agent for a disease relating to the OCT3.
  • Still another object of the present invention is to provide an OCT3 detection agent.
  • the present invention is basically based on the finding that an imidazopyridine derivative (particularly imidazo[1,2-a]pyridine derivative) has a bonding function to the OCT3 and an OCT3 activity-inhibiting function.
  • a first aspect of the present invention relates to an organic cation transporter 3 (OCT3) inhibitor containing, as an active component, a compound represented by formula (I), a pharmaceutically acceptable salt thereof, or a pharmaceutically acceptable solvate thereof.
  • OCT3 organic cation transporter 3
  • R 1 to R 3 , R 5 and R 6 may be the same or different, and each represent a hydrogen atom, a halogen atom, a C 1-3 alkyl group, a C 1-3 alkoxy group, a C 1-3 alkylthio group, or a C 1-3 halogenoalkyl group.
  • R 4 represents any of the groups represented by formulae (II) to (VII).
  • X 2 represents a C 1-10 alkyl group which may have a substituent, a C 1-10 alkoxy group which may have a substituent, a C 1-10 alkylthio group which may have a substituent, a C 2-10 alkenyl group which may have a substituent, or a C 2-10 alkynyl group which may have a substituent.
  • X 3 represents a C 1-10 alkyl group which may have a substituent, a C 1-10 alkoxy group which may have a substituent, a C 1-10 alkylthio group which may have a substituent, a C 2-10 alkenyl group which may have a substituent, or a C 2-10 alkynyl group which may have a substituent. Note that a symbol (*) is given to a bonding portion to the carbon atom (C) adjacent to R 4 in formula (III).
  • X 4 represents a C 1-10 alkyl group which may have a substituent, a C 1-10 alkoxy group which may have a substituent, a C 1-10 alkylthio group which may have a substituent, a C 2-10 alkenyl group which may have a substituent, a C 2-10 alkynyl group which may have a substituent, or a C 6-12 aryl group which may have a substituent.
  • X 5 represents a C 1-10 alkyl group which may have a substituent, a C 1-10 alkoxy group which may have a substituent, a C 1-10 alkylthio group which may have a substituent, a C 2-10 alkenyl group which may have a substituent, a C 2-10 alkynyl group which may have a substituent, a 5-membered ring group which may have a substituent, or a C 6-12 aryl group which may have a substituent.
  • X 6 represents a C 1-10 alkyl group which may have a substituent, a C 1-10 alkoxy group which may have a substituent, a C 1-10 alkylthio group which may have a substituent, a C 2-10 alkenyl group which may have a substituent, a C 2-10 alkynyl group which may have a substituent, a 5-membered ring group which may have a substituent, or a C 6-12 aryl group which may have a substituent.
  • X 7 represents a C 1-10 alkyl group which may have a substituent, a C 1-10 alkoxy group which may have a substituent, a C 1-10 alkylthio group which may have a substituent, a C 2-10 alkenyl group which may have a substituent, a C 2-10 alkynyl group which may have a substituent, a 5-membered ring group which may have a substituent, or a C 6-12 aryl group which may have a substituent.
  • a second aspect of the present invention relates to a therapeutic agent for mental disorder, containing any of the above-described “organic cation transporter 3 (OCT3) inhibitors” as an active component. More specifically, this aspect relates to a therapeutic agent for depression, containing any of the above-described organic cation transporter 3 (OCT3) inhibitors as an active component.
  • OCT3 organic cation transporter 3
  • a third aspect of the present invention relates to an organic cation transporter 3 (OCT3) detection agent.
  • OCT3 organic cation transporter 3
  • an OCT3 activity inhibitor having a different basic structure from the OCT3 activity inhibitor in the related art.
  • the present invention can provide a therapeutic agent for a disease relating to the OCT3.
  • the present invention can provide an OCT3 detection agent.
  • a first aspect of the present invention relates to an organic cation transporter 3 (OCT3) inhibitor containing, as an active component, a compound represented by formula (I) (the compound of the present invention), a pharmaceutically acceptable salt thereof, or a pharmaceutically acceptable solvate thereof.
  • OCT3 organic cation transporter 3
  • the compound of the present invention is an imidazopyridine derivative. More specifically, the compound of the present invention is an imidazo[1,2-a]pyridine derivative.
  • R 1 to R 3 , R 5 and R 6 may be the same or different, and each represent a hydrogen atom, a halogen atom, a C 1-3 alkyl group, a C 1-3 alkoxy group, a C 1-3 alkylthio group, or a C 1-3 halogenoalkyl group.
  • R 1 to R 3 , R 5 , and R 6 include a hydrogen atom and a C 1-3 alkyl group.
  • the C 1-3 alkyl group is preferably a methyl group or an ethyl group.
  • R 4 represents any of the groups represented by formulae (II) to (VII).
  • X 2 represents a C 1-10 alkyl group which may have a substituent, a C 1-10 alkoxy group which may have a substituent, a C 1-10 alkylthio group which may have a substituent, a C 2-10 alkenyl group which may have a substituent, a C 2-10 alkynyl group which may have a substituent, a C 6-10 aryl group which may have a substituent, or a C 7-10 aralkyl group which may have a substituent.
  • X 3 represents a C 1-10 alkyl group which may have a substituent, a C 1-10 alkoxy group which may have a substituent, a C 1-10 alkylthio group which may have a substituent, a C 2-10 alkenyl group which may have a substituent, or a C 2-10 alkynyl group which may have a substituent. Note that a symbol (*) is given to a bonding portion to the carbon atom (C) adjacent to R 4 in formula (III).
  • X 4 represents a C 1-10 alkyl group which may have a substituent, a C 1-10 alkoxy group which may have a substituent, a C 1-10 alkylthio group which may have a substituent, a C 2-10 alkenyl group which may have a substituent, a C 2-10 alkynyl group which may have a substituent, or a C 6-12 aryl group which may have a substituent.
  • X 5 represents a C 1-10 alkyl group which may have a substituent, a C 1-10 alkoxy group which may have a substituent, a C 1-10 alkylthio group which may have a substituent, a C 2-10 alkenyl group which may have a substituent, a C 2-10 alkynyl group which may have a substituent, a 5-membered ring group which may have a substituent, or a C 6-12 aryl group which may have a substituent.
  • X 6 represents a C 1-10 alkyl group which may have a substituent, a C 1-10 alkoxy group which may have a substituent, a C 1-10 alkylthio group which may have a substituent, a C 2-10 alkenyl group which may have a substituent, a C 2-10 alkynyl group which may have a substituent, a 5-membered ring group which may have a substituent, or a C 6-12 aryl group which may have a substituent.
  • X 7 represents a C 1-10 alkyl group which may have a substituent, a C 1-10 alkoxy group which may have a substituent, a C 1-10 alkylthio group which may have a substituent, a C 2-10 alkenyl group which may have a substituent, a C 2-10 alkynyl group which may have a substituent, a 5-membered ring group which may have a substituent, or a C 6-12 aryl group which may have a substituent.
  • the organic cation transporter 3 (OCT3) inhibitor inhibits an activity of the OCT3.
  • the OCT3 activity-inhibiting function can be measured by a method described in Examples.
  • the pharmaceutically acceptable salt indicates a derivative of the disclosed compound, modified by forming an acidic or basic salt of a parent compound.
  • the pharmaceutically acceptable salt are not limited to, but include an inorganic acid salt of a basic residue such as amine and an organic acid salt thereof, and an alkali salt of an acidic residue such as carboxylic acid and an organic salt thereof.
  • the pharmaceutically acceptable salt include a normal nontoxic salt of the parent compound and a quaternary ammonium salt thereof, generated from a nontoxic inorganic or organic acid.
  • Such a normal nontoxic salt includes a salt derived from an inorganic acid and a salt prepared from an organic acid.
  • Examples of the inorganic acid include hydrochloric acid, hydrobromic acid, sulfuric acid, sulfamic acid, phosphoric acid, and nitric acid.
  • Examples of the organic acid include acetic acid, propionic acid, succinic acid, glycolic acid, stearic acid, lactic acid, malic acid, tartaric acid, citric acid, ascorbic acid, pamoic acid, maleic acid, hydroxymaleic acid, phenylacetic acid, glutamic acid, benzoic acid, salicylic acid, sulfanilic acid, 2-acetoxy benzoic acid, fumaric acid, toluenesulfonic acid, methanesulfonic acid, ethanedisulfonic acid, oxalic acid, and isethionic acid.
  • the pharmaceutically acceptable salt of the compound provided herein is synthesized by a usual chemical method from the parent compound containing a basic or acidic moiety.
  • such salts are prepared by causing these compounds in a form of a free acid or a free base to react with a base or an acid in an appropriate stoichiometric amount in water, an organic solvent, or a mixture of these two kinds of solvents.
  • a nonaqueous medium such as ether, ethyl acetate, ethanol, isopropanol, or acetonitrile is preferable.
  • Suitable salts are listed in “Remington's Pharmaceutical Sciences”, 17th ed., Mack Publishing Company, Easton, Pa., 1985, p. 1418. Its disclosure is incorporated here by reference.
  • a solvent is solvated to a target compound.
  • An example of solvation is hydration.
  • the compound of the present invention includes a compound containing a hydroxyl group, an amide group, or the like, which can form a hydrate with water in the atmosphere.
  • the “C 1-10 alkyl group which may have a substituent” is a C 1-10 alkyl group having one or more substituents selected from the following substituent group A.
  • the C 1-10 alkyl group in the C 1-10 alkyl group which may have a substituent is a linear alkyl group having 1 to 10 carbon atoms, a branched alkyl group having 3 to 10 carbon atoms, or a cyclic alkyl group having 3 to 10 carbon atoms.
  • linear alkyl group examples include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, and a decyl group.
  • Examples of the branched alkyl group include an isopropyl group, an isobutyl group, a 1-methylpropyl group, a t-butyl group, a 1-methylbutyl group, a 2-methylbutyl group, a 3-methylbutyl group, a 1-ethylpropyl group, a 1,1-dimethylpropyl group, a 2,2-dimethylpropyl group, a 1,2-dimethylpropyl group, a 1-methylpentyl group, a 2-methylpentyl group, a 3-methylpentyl group, a 4-methylpentyl group, a 1-ethylbutyl group, a 2-ethylbutyl group, a 1,1-dimethylbutyl group, a 1,2-dimethylbutyl group, a 1,3-dimethylbutyl group, a 2,2-dimethylbutyl group, a 2,3-dimethylbutyl group, a 3,3-
  • cyclic alkyl group examples include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, and a cyclooctyl group.
  • a C 1-6 alkyl group is preferable, and a C 1-3 alkyl group is more preferable.
  • Examples of the C 1-6 alkyl group include a methyl group, an ethyl group, a n-propyl group, an isopropyl group, a n-butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, a n-pentyl group, an isopentyl group, a neopentyl group, a tert-pentyl group, a 1-methylbutyl group, a 2-methylbutyl group, a 1,2-dimethylpropyl group, a 1-ethylpropyl group, a n-hexyl group, an isohexyl group, a 1-methylpentyl group, a 2-methylpentyl group, a 3-methylpentyl group, a 1,1-dimethylbutyl group, a 1,2-dimethylbutyl group, a 2,2-dimethylbutyl group, a
  • the “C 1-10 alkoxy group which may have a substituent” is a C 1-10 alkoxy group having one or more substituents selected from the following substituent group A.
  • Examples of the C 1-10 alkoxy group in the C 1-10 alkoxy group which may have a substituent include a group in which a group represented by —O— is bonded to an end of the above-described C 1-10 alkyl group. Specific examples thereof include a methoxy group, an ethoxy group, and a propyloxy group.
  • the “C 1-10 alkylthio group which may have a substituent” is a C 1-10 alkylthio group having one or more substituents selected from the following substituent group A.
  • Examples of the C 1-10 alkylthio group in the C 1-10 alkylthio group which may have a substituent include a group in which a group represented by —S— is bonded to an end of the above-described C 1-10 alkyl group.
  • the “C 2-10 alkenyl group which may have a substituent” is a C 2-10 alkenyl group having one or more substituents selected from the following substituent group A.
  • the C 2-10 alkenyl group in the C 2-10 alkenyl group which may have a substituent is a linear alkenyl group having 2 to 10 carbon atoms and at least one double bond, a branched alkenyl group having 3 to 10 carbon atoms, or a cyclic alkenyl group having 5 to 10 carbon atoms.
  • Examples thereof include a vinyl group, an allyl group, a 3-butenyl group, a 4-pentenyl group, a 5-hexenyl group, a 6-heptenyl group, a 7-octenyl group, a 8-nonenyl(noneyl) group, a 9-decenyl group, a 1-methyl-2-butenyl group, a 2-methyl-2-butenyl group, a 2-methyl-3-butenyl group, a 2-pentenyl group, a 2-methyl-2-hexenyl group, and a 2-cyclopentenyl group.
  • a C 2-10 alkenyl group a C 2-6 alkenyl group is preferable, and a C 2-3 alkenyl group is more preferable.
  • the “C 2-10 alkynyl group which may have a substituent” is a C 2-10 alkynyl group having one or more substituents selected from the following substituent group A.
  • the alkynyl group is a monovalent group having at least one triple bond (two adjacent SP carbon atoms). Examples of the C 2-10 alkynyl group include an ethynyl group, a 1-propynyl group, a propargyl group, and a 3-butynyl group.
  • the C 2-10 alkynyl group is preferably a C 2-6 alkynyl group, more preferably a C 2-5 alkynyl group, still more preferably a C 2-4 alkynyl group, and further still more preferably a C 2-3 alkynyl group.
  • the “C 6-12 aryl group which may have a substituent” is a C 6-12 aryl group having one or more substituents selected from the following substituent group A.
  • the C 6-12 aryl group may be a heteroaryl group.
  • the C 6-12 aryl group in the C 6-12 aryl group which may have a substituent group is an aromatic carbocyclic group or an aromatic heterocyclic group.
  • Examples of the aromatic carbocyclic group and the aromatic heterocyclic group as the C 6-12 aryl group include a phenyl group, a 2-fluorophenyl group, a 3-fluorophenyl group, a 4-fluorophenyl group, a 4-chlorophenyl group, a 3,4-difluorophenyl group, a 2,4-difluorophenyl group, a 2-trifluoromethylphenyl group, a 3-trifluorophenylmethyl group, a 4-trifluoromethylphenyl group, a 4-methoxyphenyl group, a 4-methanesulfonylphenyl group, a 3-fluoro-4-methoxyphenyl group, a naphthyl group, a pyridinyl group, a 3-trifluoromethylpyridin-6-yl group, a 2-trifluoromethylpyridin-5-yl group, a 2-fluoropyridin-5
  • halogen atom examples include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.
  • the “C 3-6 cycloalkyl group” is a cycloalkyl group having 3 to 6 carbon atoms, and specific examples thereof include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, and a cyclohexyl group.
  • C 1-6 alkyl group which may be substituted with a fluorine atom includes a C 1-6 alkyl group and a C 1-6 alkyl group in which some or all of the hydrogen atoms in the C 1-6 alkyl group are substituted with fluorine atoms.
  • Specific examples of the latter C 1-6 alkyl group substituted with fluorine atoms include a fluoromethyl group, a difluoromethyl group, a trifluoromethyl group, and a 1,2-difluoroethyl group.
  • the “C 1-6 alkyl group which may be substituted with a hydroxyl group” includes a C 1-6 alkyl group and a C 1-6 alkyl group in which some of the hydrogen atoms in the C 1-6 alkyl group are substituted with hydroxyl groups.
  • Specific examples of the latter C 1-6 alkyl group substituted with hydroxyl groups include a hydroxymethyl group, a 2-hydroxyethyl group, and a 3-hydroxypropyl group.
  • the “C 1-6 alkyloxy group which may be substituted with a fluorine atom” includes a group in which a C 1-6 alkyl group or a C 1-6 alkyl group substituted with a fluorine atom is bonded to an oxygen atom.
  • Specific examples of the C 1-6 alkyloxy group include a methoxy group, an ethoxy group, a n-propyloxy group, an isopropyloxy group, a n-butyloxy group, an isobutoxy group, a tert-butoxy group, and a n-pentyloxy group.
  • C 1-6 alkyloxy group substituted with a fluorine atom examples include a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group, and a 1,2-difluoroethoxy group.
  • the “mono C 1-6 alkylamino group” is a group in which one hydrogen atom in an amino group is substituted with a C 1-6 alkyl group. Specific examples thereof include a methylamino group, an ethylamino group, a n-propylamino group, an isopropylamino group, a n-butylamino group, a sec-butylamino group, and a tert-butylamino group.
  • the “di C 1-6 alkylamino group” is a group in which two hydrogen atoms in an amino group are substituted with C 1-6 alkyl groups.
  • Specific examples thereof include a dimethylamino group, a diethylamino group, an ethylmethylamino group, a di(n-propyl)amino group, a methylpropylamino group, and a diisopropylamino group.
  • C 1-6 alkyloxy C 1-6 alkyl group is a group in which one hydrogen atom in a C 1-6 alkyl group is substituted with a C 1-6 alkyloxy group. Specific examples thereof include a methoxymethyl group, an ethoxymethyl group, a n-propyloxymethyl group, an ethoxymethyl group, and an ethoxyethyl group.
  • the “C 1-6 alkyloxycarbonyl group” is a group in which a C 1-6 alkyloxy group is bonded to a carbonyl group. Specific examples thereof include a methoxycarbonyl group, an ethoxycarbonyl group, a n-propyloxycarbonyl group, an isopropyloxycarbonyl group, a n-butyloxycarbonyl group, an isobutoxycarbonyl group, a tert-butoxycarbonyl group, and a n-pentyloxycarbonyl group.
  • the “(C 1-6 alkyloxycarbonyl)amino group” is a group in which a C 1-6 alkyloxycarbonyl group is bonded to an amino group. Specific examples thereof include a methoxycarbonylamino group, an ethoxycarbonylamino group, a n-propyloxycarbonylamino group, an isopropyloxycarbonylamino group, a n-butoxycarbonylamino group, an isobutoxycarbonylamino group, a tert-butoxycarbonylamino group, and a n-pentyloxycarbonylamino group.
  • the “(C 1-6 alkyloxycarbonyl)C 1-6 alkyl amino group” is a group in which a hydrogen atom bonded to a nitrogen atom in a mono C 1-6 alkylamino group is substituted with a C 1-6 alkyloxycarbonyl group. Specific examples thereof include a (methoxycarbonyl)methylamino group, an (ethoxycarbonyl)methylamino group, and a (n-propyloxycarbonyl)methylamino group.
  • the “C 1-6 alkylcarbonyl group” is a group in which a C 1-6 alkyl group is bonded to a carbonyl group. Specific examples thereof include an acetyl group, a propionyl group, a butyryl group, an isobutyryl group, a valeryl group, an isovaleryl group, and a pivaloyl group.
  • the “C 1-6 alkylcarbonyloxy group” is a group in which a C 1-6 alkylcarbonyl group is bonded to an oxygen atom. Specific examples thereof include an acetoxy group, a propionyloxy group, a valeryloxy group, an isovaleryloxy group, and a pivaloyloxy group.
  • the “C 1-6 alkylcarbonylamino group” is a group in which one hydrogen atom in an amino group is substituted with a C 1-6 alkylcarbonyl group. Specific examples thereof include an acetamide group, a propionylamino group, an isobutyrylamino group, a valerylamino group, an isovalerylamino group, and a pivaloylamino group.
  • the “(C 1-6 alkylcarbonyl)C 1-6 alkylamino group” is a group in which a hydrogen atom bonded to a nitrogen atom in a mono C 1-6 alkylamino group is substituted with a C 1-6 alkylcarbonyl group. Specific examples thereof include a (methylcarbonyl)methlyamino group, an (ethylcarbonyl)methylamino group, and a (n-propylcarbonyl)methylamino group.
  • the “mono C 1-6 alkylcarbamoyl group” is a group in which one hydrogen atom in a carbamoyl group is substituted with a C 1-6 alkyl group. Specific examples thereof include a methylcarbamoyl group, an ethylcarbamoyl group, a n-propylcarbamoyl group, an isopropylcarbamoyl group, a n-butylcarbamoyl group, a sec-butylcarbamoyl group, and a tert-butylcarbamoyl group.
  • the “di C 1-6 alkylcarbamoyl group” is a group in which two hydrogen atoms in a carbamoyl group are substituted with C 1-6 alkyl groups. Specific examples thereof include a dimethylcarbamoyl group, a diethylcarbamoyl group, an ethylmethylcarbamoyl group, a di(n-propyl)carbamoyl group, a methylpropylcarbamoyl group, and a diisopropylcarbamoyl group.
  • the “mono C 1-6 alkylcarbamoylamino group” is a group in which one hydrogen atom in an amino group is substituted with a C 1-6 alkylcarbamoyl group. Specific examples thereof include a methylcarbamoylamino group, an ethylcarbamoylamino group, a n-propylcarbamoylamino group, an isopropylcarbamoylamino group, a n-butylcarbamoylamino group, a sec-butylcarbamoylamino group, and a tert-butylcarbamoylamino group.
  • the “di C 1-6 alkylcarbamoylamino group” is a group in which one hydrogen atom in an amino group is substituted with a di C 1-6 alkylcarbamoyl group. Specific examples thereof include a dimethylcarbamoylamino group, a diethylcarbamoylamino group, a di(n-propyl)carbamoylamino group, a diisopropylcarbamoylamino group, a di(n-butyl)carbamoylamino group, a di(sec-butyl)carbamoylamino group, and a di(tert-butyl)carbamoylamino group.
  • the “(mono C 1-6 alkylcarbamoyl)C 1-6 alkylamino group” is a group in which a hydrogen atom bonded to a nitrogen atom in a mono C 1-6 alkylamino group is substituted with a mono C 1-6 alkylcarbamoyl group. Specific examples thereof include a (mono methylcarbamoyl)methlyamino group, a (mono ethylcarbamoyl)methylamino group, and a [mono(n-propyl)carbamoyl]methylamino group.
  • the “(di C 1-6 alkylcarbamoyl)C 1-6 alkylamino group” is a group in which a hydrogen atom bonded to a nitrogen atom in a mono C 1-6 alkylamino group is substituted with a di C 1-6 alkylcarbamoyl group. Specific examples thereof include a (dimethylcarbamoyl)methlyamino group, a (diethylcarbamoyl)methylamino group, and a [di(n-propyl)carbamoyl]methylamino group.
  • the “mono C 1-6 alkylcarbamoyloxy group” is a group in which a C 1-6 alkylcarbamoyl group is bonded to an oxygen atom. Specific examples thereof include a methylcarbamoyloxy group, an ethylcarbamoyloxy group, a n-propylcarbamoyloxy group, an isopropylcarbamoyloxy group, a n-butylcarbamoyloxy group, a sec-butylcarbamoyloxy group, and a tert-butylcarbamoyloxy group.
  • the “di C 1-6 alkylcarbamoyloxy group” is a group in which a di C 1-6 alkylcarbamoyl group is bonded to an oxygen atom. Specific examples thereof include a dimethylcarbamoyloxy group, a diethylcarbamoyloxy group, an ethylmethylcarbamoyloxy group, a di(n-propyl)carbamoyloxy group, a methylpropylcarbamoyloxy group, and a diisopropylcarbamoyloxy group.
  • the “C 1-6 alkylsulfonyl group” is a group in which a C 1-6 alkyl group is bonded to a sulfonyl group. Specific examples thereof include a methylsulfonyl group, an ethylsulfonyl group, a n-propylsulfonyl group, an isopropylsulfonyl group, a n-butylsulfonyl group, a sec-butylsulfonyl group, and a tert-butylsulfonyl group.
  • the “C 1-6 alkylsulfonylamino group” is a group in which one hydrogen atom in an amino group is substituted with a C 1-6 alkylsulfonyl group. Specific examples thereof include a methylsulfonylamino group, an ethylsulfonylamino group, a n-propylsulfonylamino group, an isopropylsulfonylamino group, a n-butylsulfonylamino group, a sec-butylsulfonylamino group, and a tert-butylsulfonylamino group.
  • the “C 1-6 alkylsulfonyl(C 1-6 alkyl)amino group” is a group in which a hydrogen atom bonded to a nitrogen atom in a “C 1-6 alkylamino group” is substituted with a C 1-6 alkylsulfonyl group. Specific examples thereof include a methylsulfonyl(methyl)amino group, an ethylsulfonyl(methyl)amino group, and a (n-prop yl)sulfonyl(methyl)amino group.
  • the “mono C 1-6 alkylsulfamoyl group” is a group in which a C 1-6 alkyl group is bonded to a sulfamoyl group. Specific examples thereof include a monomethylsulfamoyl group, a monoethylsulfamoyl group, a mono(n-propyl)sulfamoyl group, a monoisopropylsulfamoyl group, a mono(n-butyl)sulfamoyl group, a mono(sec-butyl)sulfamoyl group, and a mono(tert-butyl)sulfamoyl group.
  • the “di C 1-6 alkylsulfamoyl group” is a group in which a di C 1-6 alkyl group is bonded to a sulfamoyl group. Specific examples thereof include a dimethylsulfamoyl group, a diethylsulfamoyl group, a di(n-propyl)sulfamoyl group, a diisopropylsulfamoyl group, a di(n-butyl)sulfamoyl group, a di(sec-butyl)sulfamoyl group, and a di(tert-butyl)sulfamoyl group.
  • the “(mono C 1-6 alkylsulfamoyl)amino group” is a group in which one hydrogen atom in an amino group is substituted with a mono C 1-6 alkylsulfamoyl group. Specific examples thereof include a (monomethylsulfamoyl)amino group, a (monoethylsulfamoyl)amino group, a [mono(n-propyl)sulfamoyl]amino group, a (monoisopropylsulfamoyl)amino group, a [mono(n-butyl)sulfamoyl]amino group, a [mono(sec-butyl)sulfamoyl]amino group, and a (tert-butylsulfamoyl)amino group.
  • the “(di C 1-6 alkylsulfamoyl)amino group” is a group in which one hydrogen atom in an amino group is substituted with a di C 1-6 alkylsulfamoyl group. Specific examples thereof include a (dimethylsulfamoyl)amino group, a (diethylsulfamoyl)amino group, an (ethylmethylsulfamoyl)amino group, a [di(n-propyl)sulfamoyl]amino group, a (methylpropylsulfamoyl)amino group, and a (diisopropylsulfamoyl)amino group.
  • the “mono C 1-6 alkylsulfamoyl(C 1-6 alkyl)amino group” is a group in which a hydrogen atom bonded to a nitrogen atom in a “mono C 1-6 alkylamino group” is substituted with a mono C 1-6 alkylsulfamoyl group. Specific examples thereof include a monomethylsulfamoyl(methyl)amino group, a monoethylsulfamoyl(methyl)amino group, and a mono(n-propyl) sulfamoyl(methyl)amino group.
  • the “di C 1-6 alkylsulfamoyl(C 1-6 alkyl)amino group” is a group in which a hydrogen atom bonded to a nitrogen atom in a “mono C 1-6 alkylamino group” is substituted with a di C 1-6 alkylsulfamoyl group. Specific examples thereof include a dimethylsulfamoyl(methyl)amino group, a diethylsulfamoyl(methyl)amino group, and a di(n-propyl)sulfamoyl(methyl)amino group.
  • Examples of the “3 to 8-membered heterocycloalkyl group” include an azetidinyl group, a pyrrolidinyl group, a piperidinyl group, a piperazinyl group, an imidazolidinyl group, a tetrahydrofuranyl group, a tetrahydropyranyl group, a morpholinyl group, a 1-thia-4-azocyclohexyl group, and a 2,5-diazabicyclo[2.2.2]octanyl group.
  • Examples of the compound of the present invention as a first group are as follows. That is, a compound represented by formula (I), in which R 1 , R 2 , R 3 , R 5 , and R 6 each represent a hydrogen atom or a methyl group, and R 4 represents a group represented by formula (II).
  • R 1 , R 3 , R 5 , and R 6 each preferably represent a hydrogen atom
  • R 2 preferably represents a methyl group.
  • X 2 represents a group represented by —Y 21 —Y 22 —Y 23 or —Y 21 —Y 22 (—Y 23 Y 24 ).
  • Y 21 represents a linear or branched C 1-5 alkylene group.
  • Y 22 represents a single bond, an oxygen atom, a sulfur atom, or a group represented by SO 2 (—S( ⁇ O) 2 —).
  • Y 23 and Y 24 may be the same or different, and each represent:
  • a pyrrolidinyl group which may be substituted with a methyl group, a group represented by ⁇ O (carbonyl group), or a halogen atom;
  • thiazolidinyl group which may be substituted with a methyl group, a group represented by ⁇ O (carbonyl group), or a halogen atom;
  • a pyrrolidinyl group substituted with a halogen atom, a nitro group, a C 1-5 alkyl group, C 1-5 alkoxy group, C 1-5 halgenoalkyl group, C 1-5 halgenoalkoxy group, a pyrrolidinyl group, or a group represented by ⁇ O (carbonyl group); or
  • X 2 may represent a group represented by —Y 25 (Y 26 )—Y 27 .
  • Y 25 represents a phenyl group in which one to three hydrogen atoms may be substituted with a halogen atom, a nitro group, a C 1-5 alkyl group, a C 1-5 alkoxy group, a C 1-5 halgenoalkyl group, a C 1-5 halgenoalkoxy group, a pyrrolidinyl group, or a group represented by ⁇ O.
  • Y 26 represents a pyrrolidinyl group which may substituted with a hydrogen atom, a phenyl group, a C 3-5 cycloalkyl group, or a C 1-5 alkyl group, or a pyrrole group which may be substituted with a C 1-5 alkyl group.
  • Y 27 represents:
  • R 1 , R 2 , R 3 , R 5 and R 6 each represent a hydrogen atom or a methyl group
  • R 4 represents a group represented by formula (II).
  • X 2 represents any of the groups represented by the following formulae (1-1) to (1-26).
  • R 1 , R 3 , R 5 , and R 6 each preferably represent a hydrogen atom
  • R 2 preferably represents a methyl group.
  • R 1 , R 2 , R 3 , R 5 and R 6 each represent a hydrogen atom or a methyl group
  • R 4 represents a group represented by formula (III).
  • X 3 represents a group represented by the following formula (2-1) or (2-2).
  • R 1 , R 3 , R 5 , and R 6 each preferably represent a hydrogen atom
  • R 2 preferably represents a methyl group.
  • R 1 , R 2 , R 3 , R 5 and R 6 each represent a hydrogen atom or a methyl group
  • R 4 represents a group represented by formula (IV).
  • X 4 represents any of the groups represented by the following formulae (3-1) to (3-4).
  • R 1 , R 3 , R 5 , and R 6 each preferably represent a hydrogen atom
  • R 2 preferably represents a methyl group.
  • R 1 , R 2 , R 3 , R 5 and R 6 each represent a hydrogen atom or a methyl group
  • R 4 represents a group represented by formula (V).
  • X 5 represents any of the groups represented by the following formulae (4-1), (5-1), (5-2), and (6-1).
  • R 1 represents a methyl group
  • R 2 , R 3 , R 5 , and R 6 each represent a hydrogen atom
  • X 5 represents a group represented by formula (4-1) in formula (V);
  • R 1 , R 2 , R 5 , and R 6 each represent a hydrogen atom
  • R 3 represents a methyl group
  • X 5 represents a group represented by formula (5-1) or (5-2) in formula (V); or
  • R 1 , R 2 , R 3 , R 5 and R 6 each represent a hydrogen atom or a methyl group
  • R 4 represents a group represented by formula (VI).
  • X 6 represents any of groups represented by the following formula (7-1) or (7-4).
  • R 1 , R 2 , R 3 , R 5 and R 6 each preferably represent a hydrogen atom.
  • a bonding site is clearly indicated by giving a symbol (*) to a bonding portion to a carbon atom (C) adjacent to X 6 .
  • R′, R 2 , R 3 , R 5 and R 6 each represent a hydrogen atom or a methyl group
  • R 4 represents a group represented by formula (VII).
  • X 7 represents any of groups represented by the following formula (8-1) or (8-2).
  • R 1 , R 2 , R 3 , R 5 and R 6 each preferably represent a hydrogen atom.
  • An OCT3 activity inhibitor including the compound of the present invention can be manufactured in a similar manner to a method disclosed in Re-publication of PCT International Publication No. 2005/084707.
  • Examples of the activity of the OCT3 include a transport activity of dopamine, serotonin, noradrenaline, dopamine neurotoxin MPP+, a stimulant, or the like. These activities can be measured by a method well known to a person skilled in the art.
  • the OCT3 activity inhibitor including the compound of the present invention is effective in a treatment of a disease (depression and symptoms suggesting depression) relating to the OCT3.
  • depression and symptoms suggesting depression can be treated by inhibiting the organic cation transporter OCT3.
  • the prior literature Korean (Kitaichi. et al., Neurosci Lett. 2005 Jul. 1-8; 382 (1-2): 195-200) reports that an antidepressant effect is exhibited in a forced swimming test by suppressing expression of an OCT3 gene in a mouse with an antisense or knock-out technology.
  • the present OCT3 inhibitor is presumed to have an effect similar to suppressing the expression of the OCT3 gene because this OCT3 inhibitor inhibits a function of OCT3 protein.
  • the present invention also provides a therapeutic agent for depression and symptoms suggesting depression, containing the above-described OCT3 inhibitor as an active component.
  • the depression and symptoms suggesting depression include physical depression, unipolar depression, psychogenic functional disease, atypical depression, dysthymia, bipolar affective disease, seasonal depression, and persistent mood disorder.
  • the compound of the present invention can be administered orally or parenterally, and can be formulated in a form suitable for administration thereof.
  • a pharmaceutically acceptable carrier according to an administration form thereof.
  • various additives in the related art of the pharmaceutical field can be used.
  • Examples thereof include gelatin, lactose, sucrose, titanium oxide, starch, crystalline cellulose, hydroxypropylmethyl cellulose, carboxymethyl cellulose, corn starch, microcrystalline wax, white petrolatum, magnesium metasilicate aluminate, calcium phosphate anhydride, citric acid, trisodium citrate, hydroxypropyl cellulose, sorbitol, sorbitan fatty acid ester, polysorbate, sucrose fatty acid ester, polyoxyethylene, hardened castor oil, polyvinyl pyrrolidone, magnesium stearate, light anhydrous silicic acid, talc, vegetable oil, benzyl alcohol, gum arabic, propylene glycol, polyalkylene glycol, cyclodextrin, and hydroxypropyl cyclodextrin.
  • Examples of a dosage form to be formulated as a mixture of these carriers and the compound of the present invention include a tablet, a capsule, a granule, a solid preparation such as powder or a suppository, and a liquid preparation such as a syrup, an elixir, or an injection.
  • These dosage forms can be prepared according to a method in the related art of the pharmaceutical field.
  • a liquid preparation may be dissolved or suspended in water or another appropriate medium when being used.
  • the injection may be dissolved or suspended in physiological saline or a glucose solution if necessary, and a buffer or a preservative may be further added thereto.
  • These preparations can contain the compound of the present invention in 1.0 to 100 wt %, preferably in 1.0 to 60 wt %, and can contain a pharmaceutically acceptable carrier in 0 to 99.0 wt %, preferably in 40 to 99.0 wt %, of the whole pharmaceutical composition.
  • a dosage and a frequency of administration depend on a patient's sex, age, weight, a degree of symptoms, a type and a scope of a therapeutic effect to be aimed at, and the like.
  • 0.001 to 10 mg thereof is administered, preferably 0.01 to 2 mg is administered one to several times, to an adult per day and per kg of his/her weight.
  • the compound of the present invention can be also prophylactically administered for some symptoms.
  • OCT3 detection agent including compound of present invention
  • An OCT3 detection agent including the compound of the present invention is for detecting whether OCT3 protein is included in biological tissues, cultured cells, artificial membranes, or the like in which an existing amount of the OCT3 protein is desired to be checked, or for obtaining an index of a content of the OCT3 protein.
  • An aqueous solution of the detection agent including the compound of the present invention is added dropwise to biological tissues, cultured cells, artificial membranes, or the like in which an existing amount of the OCT3 protein is desired to be checked. Then, the compound of the present invention is bonded to the OCT3 protein, and therefore, a concentration of the compound of the present invention in the aqueous solution is reduced.
  • the concentration of the compound of the present invention when the concentration of the compound of the present invention is measured, if the concentration of the compound of the present invention is reduced, it can be recognized that the OCT3 protein is present.
  • An antibody against the OCT3 protein is commercially available, and can be used as a detection agent.
  • the antibody is high molecular protein, and therefore, is sensitive to heat. Therefore, it is necessary to store the antibody at low temperature.
  • the antibody is high molecular protein, and therefore, it is difficult to store the antibody for a long time, and manufacturing cost thereof is high.
  • the compound of the present invention or the like is resistant to heat, can be stored for a long time at normal temperature, and can be relatively inexpensively manufactured by chemical synthesis.
  • HEK293 cells which are human embryonic kidney cell lines expressing a human organic cation transporter 3 (hOCT3), were used.
  • the HEK293 cells were seeded at 1.5 ⁇ 10 5 cells/well in a 24-well plate and cultured overnight in a carbon dioxide incubator.
  • test substance After being dissolved in a 100% DMSO solution, the test substance was dissolved in a HBSS-HEPES solution (a buffer solution adjusted to pH 7.4 with 1M sodium hydroxide, by dissolving 9.7 g of Hanks balanced salt, 25 mL of 1.4% sodium bicarbonate, and 25 mL of 1M HEPES in 940 mL of ultrapure water). After a cell culture medium was removed, a pretreatment for 5 minutes was performed with 1 mL of the HBSS-HEPES solution. Thereafter, the test substance and [3H]histamine (final concentration: 100 nM) were added to the cells and allowed to react for 1 minute at room temperature.
  • HBSS-HEPES solution a buffer solution adjusted to pH 7.4 with 1M sodium hydroxide, by dissolving 9.7 g of Hanks balanced salt, 25 mL of 1.4% sodium bicarbonate, and 25 mL of 1M HEPES in 940 mL of ultrapure water.
  • the reaction was stopped with the ice-cooled HBSS-HEPES solution, and extracellular fluid was aspirated by an aspirator.
  • the cells were then washed two times with the HBSS-HEPES solution. After washing, the cells were lysed in a 0.5 M sodium hydroxide aqueous solution. An amount of histamine present in the cells was determined by measuring a radioactivity in the cell lysate with a liquid scintillation counter. A protein content of the cells was measured using the cell lysate by a Lowry method (J Biol Chem. 1951; 193 (1): 265-75).
  • a Histamine uptake amount per protein content when there is no uptake inhibitor is regarded as 100% of a histamine uptake ratio (control), and the histamine uptake ratio (%) in the presence of 30 ⁇ M of the test substance was calculated.
  • a value calculated by subtracting this histamine uptake ratio from 100(%) was regarded as an OCT3 inhibition ratio (%).
  • an OCT3 inhibitory activity (IC 50 value) was calculated from suppression curves at the concentrations of 10 ⁇ 7 to 10 ⁇ 3 M of the test substance.
  • Log P of each compound was calculated by inputting a structure of the compound to Marvin software (http://www.chemaxon.com/products/marvin/, version 5.7.0), and was denoted in Tables.
  • OCT3 inhibitor When the OCT3 inhibitor is used as a therapeutic agent for depression, intracerebral transferability becomes a problem. Many existing OCT3 inhibitors have a small log P value and bad intracerebral transferability. A compound having a large log P value was designed, and the log P value was shown together with the IC 50 value. Note that it is possible to predict the intracerebral transferability using this log P value.
  • Brain/Blood A ratio of a brain concentration with respect to a blood concentration (hereinafter, expressed by Brain/Blood) was predicted from the structure of the compound, and also shown. A plurality of prediction methods has been reported. Brain/Blood was calculated based on Prabha et al., In Silico Modeling for Blood-Brain Barrier Permeability Predictions, Drug absorption studies, 2008, volume VII, 3, 510-556, using the following equation.
  • PSA represents a polarity surface area, which was calculated using the above-described Marvin software.
  • the Brain/Blood value predicted with the above method was verified with an experiment using BALB/c mice.
  • test substances in the verification experiment two compounds of SR-4277 and Famotidine were used.
  • a strong OCT3 inhibitory effect of SR-4277 has been confirmed.
  • Both the OCT3 inhibitory effect and an antidepressant effect of Famotidine have been confirmed.
  • the test substance was administered in 5 mg/kg to the mice.
  • the mice were anesthetized in advance with isoflurane, and exsanguination was performed from the vena cava of the mice five minutes after the administration. Brains were removed, and weights thereof were measured. After that, a brain homogenate was prepared.
  • the collected blood was subjected to centrifugation, and plasma was thereby prepared. Concentrations of the test substance in plasma and the brain homogenate were measured with HPLC and MS. Results of the predicted value and the measured value of Brain/Blood are shown below.
  • IC 50 values of some compounds and an IC 50 value of famotidine having the strong OCT3 inhibitory activity, measured simultaneously as a comparison are as follows.
  • SR-4277 has IC 50 of 8.2 ⁇ M and IC 80 of 30 ⁇ M.
  • SR-4277 has the strong inhibitory activity. Note that it is easily estimated that a compound having the OCT3 inhibitory activity has OCT1 and OCT2 inhibitory activities because the OCT3 is very similar to the OCT1 and the OCT2 in amino acid sequences.
  • the imidazopyridine derivative of the present invention is a strong OCT3 protein inhibitor, and is useful as an OCT3 detection agent.
  • an imidazopyridine derivative aqueous solution is added dropwise to biological tissues, cultured cells, artificial membranes, or the like in which an existing amount of the OCT3 protein is desired to be checked, the imidazopyridine derivative is bonded to the OCT3 protein, and therefore, a concentration of the imidazopyridine derivative in the aqueous solution is reduced. When this concentration is reduced, it is understood that the OCT3 protein is present.
  • a method for detecting the OCT3 protein can be realized by a histamine uptake experiment described below.
  • a histamine uptake experiment is performed according to a method described in Br J Pharmacol. 2002; 136 (6): 829-836.
  • An existing amount of the OCT3 protein can be estimated from an amount of a compound free in the extracellular fluid in a method similar to a method described in Japanese Patent No. 1936624.
  • HEK293 cells which are human embryonic kidney cell lines expressing the human organic cation transporter 3 (OCT3) are prepared as a positive control, and cell lines the OCT3 expression of which is desired to be checked are prepared as test cells.
  • the cells are seeded at 1.5 ⁇ 10 5 cells/well in a 24-well plate and cultured overnight in a carbon dioxide incubator.
  • the test substance After being dissolved in a 100% DMSO solution, the test substance was dissolved in a HBSS-HEPES solution (a buffer solution adjusted to pH 7.4 with 1M sodium hydroxide, by dissolving 9.7 g of Hanks balanced salt, 25 mL of 1.4% sodium bicarbonate, and 25 mL of 1M HEPES in 940 mL of ultrapure water). After a cell culture medium is removed, a pretreatment for 5 minutes is performed with 1 mL of the HBSS-HEPES solution. Thereafter, the compound of the present invention as the test substance and histamine (final concentration: 100 nM) are added to the cells and allowed to react for 1 minute at room temperature. After completion of the reaction, the reaction is stopped with the ice-cooled HBSS-HEPES solution, and extracellular fluid is collected.
  • HBSS-HEPES solution a buffer solution adjusted to pH 7.4 with 1M sodium hydroxide, by dissolving 9.7 g of Hanks balanced salt, 25 mL
  • Another method for estimating the concentration of the compound of the present invention in the extracellular fluid is as follows. Standard solutions of the compound of the present invention, having a plurality of concentrations, are prepared in advance, and absorbance thereof is measured in advance. Subsequently, the absorbance of the extracellular fluid collected in the above-described histamine uptake experiment is measured and compared with the measured value in the standard solution measured in advance. The concentration can be thereby easily estimated even without using the LC/MS.
  • an antibody against the OCT3 protein is commercially available, and can be used as a detection agent.
  • the antibody is high molecular protein, and is sensitive to heat (stored at 4° C.). Therefore, it is difficult to store the antibody for a long time, and manufacturing cost thereof is high.
  • the imidazopyridine derivative is resistant to heat, can be stored for a long time at normal temperature, and can be inexpensively manufactured by chemical synthesis.
  • Example 2 relates to a method for evaluating an antidepressant effect and anti-symptoms suggesting depression.
  • the most general method for evaluating the antidepressant effect is a forced swimming test developed by Porsolt et al. (Porsolt R D et al., Arch Int Pharmacodyn. 1977; 229: 327-336).
  • mice or rats as test animals are forced to swim in water tanks from which the mice or rats cannot escape.
  • an immobility behavior of the test animals after an escape behavior thereof a state in which only the head is above the water surface and the test animals are floating without moving the hands or feet
  • the test animals are put into the water tanks again 24 hours or more later, the immobility behavior is expressed earlier than in the first experiment. Duration of this immobility behavior for a certain time (usually about 5 minutes) is relatively accurately reproduced.
  • the following method is usually used as a test design using this method.
  • standard antidepressants for example, tricyclic antidepressants
  • a buffer solution etc. including no drug as a negative control are administered respectively to different individual animals.
  • the experimental conditions of the forced swimming test are set so as to be able to detect “a change in behavior specifically occurring”.
  • test substance is administered in a similar schedule to the positive control drug.
  • test drug can be expected to have the antidepressant effect which is a similar clinical effect to that of the positive control drug (Yutaka Nakagawa, practice behavioral pharmacology, Kinpodo, 2010, p 35-42).
  • Example 3 relates to confirmation of the antidepressant effect by the OCT3 inhibitor and a combined effect thereof with an antidepressant imipramine.
  • the confirmation of the antidepressant effect by the OCT3 inhibitor and the combined effect thereof with the antidepressant imipramine can be performed in a similar manner to a prior literature (Kitaichi. et al., Neurosci Lett. 2005 Jul. 1-8; 382 (1-2): 195-200). Specifically, a test is performed as follows.
  • ddY male mice each weighing 28 to 33 g (Japan SLC, Inc.) are used.
  • the ddY mice are non-inbred mice, have high fertility, and grow well.
  • the ddY mouse is a typical strain name for laboratory mice widely used in a variety of tests and research including tests for medicinal, pharmacology, toxicity, and the like. After being acquired, these mice are bred in a room in which temperature (22 to 24° C.), humidity (50 to 60%), and lighting (lighting 8:00 to 20:00) are controlled for three or more days.
  • mice In the first forced swimming test, all the experimental mice are forced to swim in glass cylinders (diameter 15.5 cm, depth 17 cm, water depth 12 cm, water temperature 25° C.) for 300 seconds to measure immobility time.
  • the mice are distributed into experimental groups (an OCT3 inhibitor-administrated group, a positive control group, and a negative control group) such that an average value of the immobility time is almost the same.
  • mice expressing the immobility time having a difference of 60 seconds or more from the average value of the immobility time (long or short) are excluded from the experiment.
  • water in the water tank is exchanged for each mouse.
  • the OCT3 inhibitor which was dissolved the day after swimming in a physiological buffer solution (140 mM NaCl, 3.0 mM KCl, 1.5 mM NaH2PO4, 1.2 mM MgCl2, 1.2 mM CaCl2, pH 7.4) is continuously injected into the third cerebral ventricle with an osmotic pump based on a method of a previous report (J. Chem. Neuroanat. 2000 20: 375-87).
  • a physiological buffer solution 140 mM NaCl, 3.0 mM KCl, 1.5 mM NaH2PO4, 1.2 mM MgCl2, 1.2 mM CaCl2, pH 7.4
  • the antidepressant imipramine is dissolved in physiological saline (three types of final concentrations 4, 8, and 16 mg/kg are prepared). Thereafter, the resultant drug is administered into the abdominal cavity 30 minutes before the second forced swimming test starts (a drug having each concentration is administered to each group as a positive control).
  • the negative control group instead of the above-described OCT3 inhibitor, only a physiological buffer solution is continuously injected into the third cerebral ventricle in an administration method and an experimental schedule similar to those in the OCT3 inhibitor-administrated group to perform the forced swimming test.
  • the spontaneous movement activity before and after administrating the OCT3 inhibitor is measured in a similar manner to the prior literature (Kitaichi. et al., Neurosci Lett. 2005 Jul. 1-8; 382 (1-2): 195-200).
  • mice ddY male mice are used.
  • the mice which have been bred for three days or more after the purchase are divided into two groups.
  • the OCT3 inhibitor is continuously injected into the third cerebral ventricle in one of the groups with an osmotic pump based on the previous report (J. Chem. Neuroanat. 2000 20: 375-87).
  • a sham operation is performed, and a physiological buffer solution is injected into the third cerebral ventricle instead of the OCT3 inhibitor as a negative control.
  • the mice one week after the injection are placed in a plastic cage (30 cm ⁇ 35 cm ⁇ 17 cm), and spontaneous momentum is measured before and after intravenous administration of a stimulant methamphetamine (1 mg/kg).
  • the spontaneous momentum is automatically counted with an infrared sensor (Melquest Ltd., SCANET SV-10) mounted on the wall. From 120 minutes before the administration of the stimulant methamphetamine until just before the administration, the spontaneous momentum in the negative control group and the spontaneous momentum in the OCT3 inhibitor-administrated group are measured. From just after the administration of methamphetamine until 180 minutes after the administration, stimulant-induced spontaneous momentum is measured in each group. After the measurement, a significant difference test is performed for the count number of the spontaneous momentum in each group using a Scheffe method. It is determined whether the spontaneous momentum changes statistically significantly (p-value is less than 0.05).
  • the present invention can be utilized in a pharmaceutical industry.

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US14/655,729 2012-12-28 2013-12-17 Oct3 activity inhibitor containing imidazopyridine derivative as active component, and oct3 detection agent Abandoned US20150329540A1 (en)

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US11370758B2 (en) * 2018-03-23 2022-06-28 Cmg Pharmaceutical Co., Ltd. IDO-TDO dual inhibitor and related methods of use

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JP6284490B2 (ja) 2018-02-28
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US10149840B2 (en) 2018-12-11

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