# Patent

## Title
Indol carboxylic acid bispyridyl carboxamide derivatives, pharmaceutically acceptable salt thereof, preparation method and composition containing the same as an active ingredient

## Abstract

Disclosed herein are a new indole carboxylic acid bispyridyl carboxamide derivative, a preparation method thereof, and a composition for prevention or treatment of obesity, urinary disorders, and CNS disorders, containing the same as an active ingredient. Because the indole carboxylic acid bispyridyl carboxamide derivatives according to the present invention have high affinity for 5-HT2c receptors, act selectively on the 5-HT2c receptors, the derivatives rarely have adverse effects caused by other receptors. Because the derivatives effectively inhibit serotonin activity, they may be useful for treatment or prevention of obesity; urinary disorders such as urinary incontinence, premature ejaculation, erectile dysfunction, and prostatic hyperplasia; CNS disorders such as depression, anxiety, concern, panic disorder, epilepsy, obsessive-compulsive disorder, migraine, sleep disorder, withdrawal from drug abuse, Alzheimer's disease, and schizophrenia, associated with 5-HT2c receptors.

## Background
CROSS-REFERENCES TO RELATED APPLICATION
This patent application claims the benefit of priority under 35 U.S.C. §119 from Korean Patent Application No. 10-2008-0033284 filed Apr. 10, 2008, the contents of which are incorporated herein by reference.
TECHNICAL FIELD
The present disclosure relates to a novel indole carboxylic acid bispyridyl carboxamide derivative, a pharmaceutically acceptable salt thereof, a preparation method and a composition containing the same as an active ingredient.
BACKGROUND ART
The transmission of excitation through nerves and the actions of main organs are performed by neurotransmitters. These neurotransmitters include a cholinergic neurotransmitter system which secrets acetylcholine caused by stimuli in the central and peripheral nervous systems, and an adrenergic transmitter system which secrets noradrenaline. Besides, there are a lot of neurotransmitters considered to be important in the central nervous system (CNS), such as dopamine, serotonin, and inhibitory GABA (γ-aminobutyric acid). Among them, the serotonin nervous system is closely related to mental illnesses such as concern, anxiety, depression, and the like. It is known that the distribution of its receptors is considerably reduced in patients with mental illness or dementia. The serotonin system in the brain is known to regulate various physiological actions and mental states as an important neurotransmission network which control behaviors and physical functions including concern and emotional anxiety.
Serotonin (5-HT) in the central nervous system has been linked with cause of many diseases and is known to be responsible for, in particular, mental diseases such as depression, anxiety, schizophrenia, eating disorders, obsessive compulsive disorders (OCD), migraine, and panic disorder. Recent advances in pharmacology, molecular biology, and genetics on the serotonin nervous system have enabled the development of improved drug therapies for treatment of specific nervous system diseases. In fact, current general treatment methods for theses diseases have been considered to work by regulating physiological activities of serotonergic materials.
In the serotonin system having various receptor subtypes, serotonin receptors activated by 5-HT were revealed to have at least 7 subtypes (5-HT1-7), which were again divided into different subtypes (A, B . . . ). The 5-HT2c serotonin receptor subtype is transcribed and expressed in hypothalamic structure associated with appetite regulation.
It has been demonstrated that the 5-HT2c receptor agonist m-chlorophenylpiperazine (mCPP), which has some preference for the 5-HT2c receptor, reduces food intake in mice that express the normal 5-HT2c receptor while the compound lacks activity in mice expressing the mutated inactive form of the 5-HT2c receptor (Nature (1995), 374, 542-546). In a recent clinical study, a sustained reduction in body weight was obtained after 2 weeks of treatment with mCPP in obese subjects (Psychopharmacology (1997), 133, 309-312).
The 5-HT2c receptor has been suggested to be involved in CNS disorders such as depression and anxiety (IDrugs (1999), 2, 109-120).
The 5-H2c receptor has also been suggested to be involved in urinary disorders such as urinary incontinence (IDrugs (1998), 1, 456-470).
Compounds which have a selective effect on the 5-HT2c receptor may therefore have a therapeutic potential in the treatment of disorders like those mentioned above. Of course, selectivity also reduces the potential for adverse effects mediated by other serotonin receptors.
The prior art for 5-HT2c receptor antagonists is described below.
U.S. Pat. No. 3,253,989 discloses the use of mCPP as an anorectic agent.
EP-A1-863 136 discloses azetidine and pyrrolidine derivatives which are selective 5-HT2c receptor agonists having antidepressant activity and which can be used for treating or preventing serotonin-related diseases, including eating disorders and anxiety.
WO 87/04928 discloses 2-(1-piperazinyl)pyrimidines as agents for treating neuropathy.
EP-A2-226842 discloses 1,4-naphthalenedione heterocyclic derivatives as antiallergics and antiasthmatics including 2-(3-bromophenyl)-4-(1-piperazinyl)-pyrimidine.
EP-A-657 426 discloses tricyclic pyrrole derivatives having activity on the 5-HT2c receptor and which inter alia may be used for treating eating disorders.
EP-A-655 440 discloses 1-aminoethylindoles having activity on the 5-HT2c receptor and which inter alia may be used for treating eating disorders.
EP-A-572 863 discloses pyrazinoindoles having activity on the 5-HT2c receptor and which inter alia may be used for treating eating disorders.
WO 00/12475 discloses indole derivatives as 5-HT2b or 5-HT2c receptor ligands, especially for the treatment of obesity.
WO 00/12510 discloses pyrroloindoles, pyridoindoles and azepinoindoles as 5-HT2c receptor agonists, particularly for the treatment of obesity.
WO 00/12482 discloses indazole derivatives as selective, directly active 5-HT2c receptor ligands, particularly for use as anti-obesity agents.
WO 00/12502 discloses pyrroloquinolines as 5-HT2c receptor agonists, particularly for use as anti-obesity agents.
WO 00/035922 discloses 2,3,4,4,α-tetrahydro-1H-pyrazino[1,2-α]quinoxalin-5(6H)ones as 5HT2c agonists, which may be used for the treatment of obesity.
WO 00/044737 discloses aminoalkylbenzofurans as 5-HT2c agonists, which may be used for the treatment of obesity.
However, there still remains a need for development of 5-HT2c receptor antagonists having higher affinity and selectivity for 5-HT2c receptors.
Thus, the present inventors have performed research to develop 5-HT2c receptor antagonists having higher affinity and selectivity for 5-HT2c receptors than those of the prior art, synthesized indole carboxylic acid bispyridyl carboxamide derivatives, and identified that the derivatives have high affinity and selectivity for 5-HT2c receptors, thereby leading to completion of the present invention.
DISCLOSURE
Technical Problem
One object of the present invention is to provide an indole carboxylic acid bispyridyl carboxamide derivative or a pharmaceutically acceptable salt thereof.
Another object of the present invention is to provide a method of preparing an indole carboxylic acid bispyridyl carboxamide derivative or a pharmaceutically acceptable salt thereof.
Still another object of the present invention is to provide a 5-HT2c receptor antagonist containing an indole carboxylic acid bispyridyl carboxamide derivative or a pharmaceutically acceptable salt thereof as an active ingredient.
Even another object of the present invention is to provide a composition for prevention or treatment of obesity, containing an indole carboxylic acid bispyridyl, carboxamide derivative or a pharmaceutically acceptable salt thereof as an active ingredient.
Yet another object of the present invention is to provide a composition for prevention or treatment of urinary disorders, containing an indole carboxylic acid bispyridyl carboxamide derivative or a pharmaceutically acceptable salt thereof as an active ingredient.
Further another object of the present invention is to provide a composition for prevention or treatment of central nervous system (CNS) disorders, containing an indole carboxylic acid bispyridyl carboxamide derivative or a pharmaceutically acceptable salt thereof as an active ingredient.
Still further another object of the present invention is to provide a food composition for prevention or improvement of obesity, containing an indole carboxylic acid bispyridyl carboxamide derivative or a pharmaceutically acceptable salt thereof as an active ingredient.
Another object of the present invention is to provide a method for treating a disease in a mammal comprising administering a therapeutically effective amount of an indole carboxylic acid bispyridyl carboxamide derivative or a pharmaceutically acceptable salt thereof to the mammal in need thereof.
Also, another object of the present invention is to provide a use of an indole carboxylic acid bispyridyl carboxamide derivative or a pharmaceutically acceptable salt thereof in the manufacture of a medicament for preventing or treating disease.
Technical Solution
In order to achieve the objects, the present invention provides an indole carboxylic acid bispyridyl carboxamide derivative or a pharmaceutically acceptable salt thereof.
The present invention also provides a method of preparing an indole carboxylic acid bispyridyl carboxamide derivative or a pharmaceutically acceptable salt thereof.
Furthermore, the present invention provides a 5-HT2c receptor antagonist containing an indole carboxylic acid bispyridyl carboxamide derivative or a pharmaceutically acceptable salt thereof as an active ingredient.
The present invention also provides a composition for prevention or treatment of obesity, containing an indole carboxylic acid bispyridyl carboxamide derivative or a pharmaceutically acceptable salt thereof as an active ingredient.
Furthermore, the present invention provides a composition for prevention or treatment of urinary disorders, containing an indole carboxylic acid bispyridyl carboxamide derivative or a pharmaceutically acceptable salt thereof as an active ingredient.
The present invention also provides a composition for prevention or treatment of central nervous system (CNS) disorders, containing an indole carboxylic acid bispyridyl carboxamide derivative or a pharmaceutically acceptable salt thereof as an active ingredient.
Furthermore, the present invention provides a food composition for prevention or improvement of obesity, containing an indole carboxylic acid bispyridyl carboxamide derivative or a pharmaceutically acceptable salt thereof as an active ingredient.
In addition, the present invention provides a method for treating a disease selected from a group consisting of obesity, CNS disorders, and urinary disorders in a mammal, comprising administering a therapeutically effective amount of an indole carboxylic acid bispyridyl carboxamide derivative or a pharmaceutically acceptable salt thereof, to a mammal in need thereof.
Also, the present invention provides a use of an indole carboxylic acid bispyridyl carboxamide derivative or a pharmaceutically acceptable salt thereof in a manufacture of a medicament for treating or preventing a disease selected from a group consisting of obesity, CNS disorders, and urinary disorders.
Advantageous Effects
Because indole carboxylic acid bispyridyl carboxamide derivatives according to the present invention have high affinity for 5-HT2c receptors and act selectively on 5-HT2c receptors only, the derivatives rarely have adverse effects caused by other receptors and effectively inhibit serotonin activity. The derivatives may be also useful for treatment or prevention of obesity, urinary disorders such as urinary incontinence, CNS disorders such as depression and anxiety, and the like.



DESCRIPTION OF DRAWINGS
The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a graph illustrating inhibition rates of activity of G protein bound to a 5-HT2c receptor at different concentrations in one Example of the present invention.



BEST MODE
Features and advantages of the present invention will be more clearly understood by the following detailed description of the present preferred embodiments by reference to the accompanying drawings. It is first noted that terms or words used herein should be construed as meanings or concepts corresponding with the technical sprit of the present invention, based on the principle that the inventor can appropriately define the concepts of the terms to best describe his own invention. Also, it should be understood that detailed descriptions of well-known functions and structures related to the present invention will be omitted so as not to unnecessarily obscure the important point of the present invention.
Hereinafter, the present invention will be described in detail.
The present invention provides an indole carboxylic acid bispyridyl carboxamide derivatives represented by following Formula (1), or a pharmaceutically acceptable salt thereof.




wherein R1 is





A is C or N, R6 is H,





A1 to A5 are independently or selectively C or N, R7 to R11 are independently or selectively H, a C1 to C5 linear or branched alkyl group, a C1 to C5 alkoxy group, or halogen,

R2 is H or a C1 to C5 linear or branched alkyl group,
R3 to R5 are independently or selectively H, a C1 to C5 alkyl group, a C1 to C5 alkoxy group, or halogen,
X is CH2, C═O, C═S, or SO2,
Y is O, S, NH, or N—CH3,
Z is C or N, and
n is 1 or 2.
Preferably, R1 is




A1 to A5 are independently or selectively C or N, R7 to R11 are independently or selectively H, a methyl group, an ethyl group, a propyl group, an isopropyl group, a methoxy group, an ethoxy group, a propoxy group, fluorine, chlorine, bromine, or iodine,

R2 is H or a C1 to C5 linear or branched alkyl group,
R3 to R5 are independently or selectively H, a methyl group, an ethyl group, a methoxy group, an ethoxy group, fluorine, chlorine, bromine, or iodine,
X is CH2, C═O, C═S, or SO2,
Y is O, S, NH, or N—CH3,
Z is C or N, and
n is 1 or 2.
More preferably, R1 is selected from the group consisting of




R2 is H, a methyl group, or an ethyl group,
R3 is H, a methyl group, a methoxy group, or iodine,
R4 or R5 is H or a methyl group,
X is CH2, C═O, C═S, or SO2,
Y is O, S, NH or N—CH3,
Z is C or N, and
n is 1 or 2.
Indole carboxylic acid bispyridyl carboxamide derivatives represented by Formula (1) are exemplified in more detail in the followings.

    (1) benzofuran-3-sulfonic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
    (2) benzo[b]thiophene-3-sulfonic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
    (3) benzofuran-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
    (4) benzo[b]thiophene-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
    (5) 1H-indole-2-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
    (6) 1H-indole-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
    (7) 1H-benzoimidazole-2-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
    (8) naphthalene-2-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
    (9) (1H-indole-3-ylmethyl)-[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amine;
    (10) 1H-indole-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
    (11) 1-methyl-1H-indole-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
    (12) 1H-indole-3-carboxylic acid methyl-[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
    (13) 1-methyl-1H-indole-3-carboxylic acid methyl-[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
    (14) 5-methyl-1H-indole-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
    (15) 5-methoxy-1H-indole-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
    (16) 6-methyl-1H-indole-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
    (17) 7-methyl-1H-indole-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
    (18) 5-iodo-1H-indole-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
    (19) 1H-indole-3-carboxylic acid[6-(pyrimidine-5-yloxy)-pyridine-3-yl]-amide;
    (20) 1H-indole-3-carboxylic acid[6-(pyridine-2-ylmethoxy)-pyridine-3-yl]-amide;
    (21) 1H-indole-3-carboxylic acid[6-(6-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
    (22) 1H-indole-3-carboxylic acid[6-(2-chloro-pyridine-3-yloxy)-pyridine-3-yl]-amide;
    (23) 1H-indole-3-carboxylic acid[6-(2-bromo-pyridine-3-yloxy)-pyridine-3-yl]-amide;
    (24) 1H-indole-3-carboxylic acid[6-(pyridine-3-yloxy)-pyridine-3-yl]-amide;
    (25) 1H-indole-3-carboxylic acid(6-phenoxy-pyridine-3-yl)-amide;
    (26) 1H-indole-3-carboxylic acid pyridine-3-ylamide;
    (27) 1H-indole-3-carboxylic acid(4-pyridine-3-yl-phenyl)-amide;
    (28) 6-methyl-1H-indole-3-carboxylic acid[6-(2-chloro-pyridine-3-yloxy)-pyridine-3-yl]-amide; and
    (29) 1H-indole-3-carboxylic acid[4-(4,6-dimethoxy-[1,3,5]triazine-2-yloxy)-phenyl]-amide.


The derivatives of Formula (1) of the present invention may be used in the form of pharmaceutically acceptable salts, and as the salts, acid addition salts formed with pharmaceutically acceptable free acids are useful. Acid addition salts are obtained from inorganic acids, such as hydrochloric, nitric, phosphoric, sulfuric, hydrobromic, hydroiodic, nitrous or phosphorous as well as from nontoxic organic acids such as aliphatic mono- and di-carboxylates, phenyl-substituted alkanoates, hydroxy alkanoates, aromatic acids, aliphatic and aromatic sulfonic acids. These pharmaceutically nontoxic salts include sulfate, pyrosulfate, bisulfate, sulfite, bisulfite, nitrate, phosphate, monohydrogen phosphate, dihydrogen phosphate, metaphosphate, pyrophosphate chloride, bromide, iodide, fluoride, acetate, propionate, decanoate, caprylate, acrylate, formate, isobutyrate, caprate, heptanoate, propiolate, oxalate, malonate, succinate, suberate, sebacate, fumarate, maleate, butyne-1,4-dioate, hexyne-1,6-dioate, benzoate, chlorobenzoate, methylbenzoate, dinitrobenzoate, hydroxybenzoate, methoxybenzoate, phthalate, terephthalate, benzenesulfonate, toluenesulfonate, chlorobenzenesulfonate, xylenesulfonate, phenylacetate, phenylpropionate, phenylbutyrate, citrate, lactate, -hydroxybutyrate, glycollate, malate, tartrate, methanesulfonate, propanesulfonate, naphthalene-1-sulfonate, naphthalene-2-sulfonate or mandelate.
According to the present invention, the acid addition salts may be prepared through conventional methods. For example, acid addition salt can be prepared by dissolving a derivative of Formula (1) in an excessive amount of an acid aqueous solution, and precipitating the salt in a water-miscible organic solvent, such as methanol, ethanol, acetone or acetonitrile.
Acid addition salt may be also prepared by heating a mixture including the same amount of the derivative of Formula (1) and an acid in water or alcohol, and then evaporating and drying the mixture or performing suction filtration onto the precipitated salt.
Further, a pharmaceutically acceptable metal salt may be produced using a base. An alkali metal salt or an alkaline earth metal salt may be obtained for example, by dissolving a compound in an excessive amount of alkali metal hydroxide or alkaline earth metal hydroxide solution, filtering the undissolved salt, and then evaporating and drying the filtrate. In respects to metal salts, sodium, potassium, or calcium salt is pharmaceutically preferable, and the corresponding silver salt is obtained by reacting an alkali metal salt or alkaline earth metal salt with a suitable silver salt (e.g., silver nitrate).
The present invention includes not only indole carboxylic acid bispyridyl carboxamide derivatives represented by above Formula (1) and pharmaceutically acceptable salts thereof, but also all the possible solvates and hydrates which may be formed from these.
The present invention also provides a method of preparing a new indole bispyridyl carboxamide derivative represented by following Reaction Formula 1.
Hereinafter, this will be specifically described.




where R1 to R5, n, X, Y, and Z are as defined in Formula (1), L is a leaving group that may be easily displaced by an amine, and Formula (1a) is included in Formula (1).
In the preparation method according to the present invention, a substituted heteroaryl derivative of Reaction Formula 2 may include a heteroaryl carboxylic acid derivative, a heteroarylsulfonyl derivative, and the like.
The substituted heteroaryl derivative (2) may be easily substituted when reacted with an amine, due to a leaving group (L) that may be easily displaced. These leaving groups include halide, hydroxyl group, mesylate group, tosylate group, and the like.
The substituted heteroaryl derivative may be easily prepared from a heteroaryl compound substituted by conventionally known methods. For example, a heteroaryl carboxylic derivative may be prepared by a method represented as Reaction Formula 2.




wherein R3 to R5 are as defined in Formula (1), and Formula (2a) is included in Reaction Formula 2.
Specifically, the substituted heteroaryl derivative may be prepared by reacting a suitably substituted indole (4) with a trifluoroacetate anhydride in DMF and producing an indole-3-trifluoroacetate (5) (Step a), and then adding NaOH aqueous solution thereto, hydrolyzing the mixture, and reducing a CF3 group into an OH group (Step b).
In a preparation method according to the present invention, bisarylester amine and the like may be used as an amine compound of Reaction Formula 3, and for example bipyridylester amine may be included.
The bisarylester amine may be easily prepared from a heteroaryl compound substituted by a conventionally known method, and for example bipyridylester amine may be prepared by a method represented as Reaction Formula 3.




wherein A1 to A5 and R7 to R11 are as defined in Formula (1), and Formula (3a) is included in Reaction Formula 3.
Specifically, bisarylester amine (3a) may be prepared by reacting a hydroxypyridine compound with NaH and 2-chloro-5-nitropyridine (7), and then reacting the produced nitropyrimidine with SnCl2 in ethanol and reducing the mixture.
In a preparation method of above Reaction Formula 1 according to the present invention, the heteroaryl derivative (2) may be reacted with an equivalent amine compound under suitable reaction conditions according to the kind of the derivative.
1) When the heteroaryl derivative (2) is a heteroaryl carboxylic acid derivative, a compound of Formula (1) may be prepared by reacting the derivative with the amine compound (3) in a suitable reaction solvent in the presence of a condensing agent and a base at room temperature to the boiling temperature of the solvent.
2) When the heteroaryl derivative (2) is a heteroarylsulfonyl derivative, a compound of Formula (1) may be prepared by reacting the derivative with the amine compound (3) in a suitable reaction solvent in the presence of a base at room temperature.
Available reaction solvents may include ethers such as tetrahydrofuran (THF), 1,4-dioxane, and the like; aromatic hydrocarbons such as benzene, toluene, and the like; halogenated hydrocarbons such as dichloromethane, chloroform, and the like; and acetonitrile, dimethylformamide (DMF) or mixtures thereof.
Available condensing agents may include N,N-carbonyldiimidazole (CDI), dicyclohexylcarbodiimide (DCC), diisopropylcarbodiimide (DIPC), 1-ethyl-3-(3-dimethylaminopropyl)carbodimide (EDC), O-(benzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (HBTU), and the like.
Available bases may include pyridine, diisopropylethylamine, triethylamine, 1,8-diazabicyclo-[5.4.0]undec-7-ene (DBU), and the like.
As an amine in a compound of Formula (1a) prepared by the above method is described in following Reaction Formula 4, an alkyl group (R2) may be additionally introduced by a nucleophilic substitution reaction.




wherein R1 to R5, n, X, Y, and Z are as defined in Formula (1), L is a leaving group that may be easily displaced by an amine, and Formula (1a) and Formula (1b) are included in Formula (1).
Furthermore, the present invention provides a 5-HT2c receptor antagonist containing derivatives of Formula (1) or pharmaceutically acceptable salts thereof as an active ingredient.
The present invention also provides a composition for prevention or treatment of obesity, containing a derivative of Formula (1) or a pharmaceutically acceptable salt thereof as an active ingredient.
The present invention also provides a composition of prevention or treatment of urinary disorders, containing a derivative of Formula (1) or a pharmaceutically acceptable salt thereof as an active ingredient.
The present invention also provides a composition of prevention or treatment of CNS disorders, containing a derivative of Formula (1) 1 or a pharmaceutically acceptable salt thereof as an active ingredient.
5-HT2c is transcribed and expressed in hypothalamic structure associated with appetite regulation, and it has been demonstrated through various researches that the 5-HT2c receptor is involved in obesity treatment. For example, the 5-HT2c receptor agonist m-chlorophenylpiperazine (mCPP), which has some preference for the 5-HT2c receptor, reduces food intake in mice that express the normal 5-HT2c receptor while the compound lacks activity in mice expressing the mutated inactive form of the 5-HT2c receptor (Nature (1995), 374, 542-546). In a recent clinical study, a sustained reduction in body weight was obtained after 2 weeks of treatment with mCPP in obese subjects (Psychopharmacology (1997), 133, 309-312).
In addition, the 5-HT2c receptor has been known to be involved in CNS disorders such as depression and anxiety (IDrugs (1999), 2, 109-120) and urinary disorders such as urinary incontinence (IDrugs (1998), 1, 456-470). Compounds which have a selective effect on the 5-HT2c receptor may therefore have a therapeutic potential in the treatment of disorders like those mentioned above.
In an experiment of binding to 5-HT2c receptors, derivatives represented by above Formula (1) according to the present invention showed activities equivalent to or better than those of conventional 5-HT2c receptors (See Table 2), and in a receptor selectivity experiment, similar receptors (5-HT1a, 5-HT2a, 5-HT6,5-HT7, D2, D3, and D4) other than 5-TH2c receptors showed almost no activity as IC50 values of 1000 or more. From the results, it may be known that 5-HT2c receptors have excellent selectivity (See Table 3).
Thus, a composition containing derivatives represented by above Formula (1) or pharmaceutically acceptable salts thereof as an active ingredient selectively inhibits serotonin activity for 5-HT2c receptors and may be useful for treatment or prevention of obesity; urinary disorders such as urinary incontinence, premature ejaculation, erectile dysfunction, and prostatic hyperplasia; CNS disorders such as depression, anxiety, concern, panic disorder, epilepsy, obsessive-compulsive disorder, migraine, sleep disorder, withdrawal from drug abuse, Alzheimer's disease, and schizophrenia, associated with 5-HT2c receptors.
When a composition of the present invention is used as a medicine, a pharmaceutical composition containing derivatives represented by Formula (1) or pharmaceutically acceptable salts thereof as an active ingredient may be prepared and administered in various oral or parenteral dosage forms as follows, but is not limited thereto.
Formulations for oral administration include, for example, tablets, pills, hard/soft capsules, liquid solutions, suspensions, emulsions, syrups, granules, elixirs, and the like. These formulations may contain, in addition to the active ingredient, diluents (e.g., lactose, dextrose, sucrose, mannitol, sorbitol, cellulose and/or glycerin) and lubricants (e.g., silica, talc, stearic acid or salts thereof, such as magnesium or calcium stearate, and/or polyethylene glycol). Tablets may also contain binding agents such as magnesium aluminum silicate, starch paste, gelatin, methyl cellulose, sodium carboxymethylcellulose and/or polyvinylpyrrolidone, and, if desired, disintegrators, e.g., starches, agar, alginic acid or sodium salts thereof, and/or effervescent mixtures, and/or adsorption agents, colorants, flavoring agents and sweeteners.
A pharmaceutical composition containing derivatives represented by Formula (1) as an active ingredient may be parenterally administered, and parenteral administration may be by subcutaneous, intravenous, intramuscular or intrasternal injection.
In order to make a composition suitable for parenteral administration, piperidine derivatives of Formula (1) or pharmaceutically acceptable salts thereof ought to be mixed with stabilizers or buffers in water to make solutions or suspensions, which may be formulated in a unit dosage form of ampoules or vials. The composition may be sterilized and/or contain adjuvants, such as preserving, stabilizing, wetting or emulsifying agents, salts for regulating the osmotic pressure and/or buffers. In addition, the composition may also contain other therapeutically useful substances. The composition may be prepared according to conventional mixing, granulating or coating methods. Derivatives of Formula (1) as an active ingredient may be administered orally or parenterally to mammals including humans, in an amount of 0.1 to 500 mg/kg (body weight), and preferably 0.5 to 100 mg/kg (body weight), once a day or in fractional doses.
Furthermore, the present invention provides a food composition for prevention or improvement of obesity, including derivatives of Formula (1) and sitologically acceptable supplemental additives.
The food composition of the present invention may be added to health foods for prevention or improvement of obesity. When a compound of Formula (1) of the present invention is used as an additive, the compound may be added as such or jointly used with other foods or food ingredients and suitably used in a usual manner. A blending amount of an active ingredient may be appropriately determined according to the purpose of use (prevention, health or therapeutic treatment). In general, when food or beverage is manufactured, the compound of Formula (1) 1 of the present invention is added at a ratio of 1 to 20% by weight of a raw material, and preferably 5 to 10% by weight. However, for health and hygiene or long-term intake for health control, the amount can be less than the above range, but the active ingredient can be used more than the above range because there is no problem in terms of safety issue.
There is no specific limitation in kinds of the food. Examples of foods in which the material may be added include beverages, gums, vitamin complexes, or health supplement food, and all kinds of health food in general meaning are included.
Health beverage compositions of the present invention may contain various flavors or natural carbohydrate as additional ingredient just like general beverage. The natural carbohydrate include monosaccharide such as, glucose and fructose, disaccharide such as maltose and sucrose, polysaccharide such as dextrin and cyclodextrin, and sugar alcohol such as xylitol, sorbitol, erythritol, and the like. For sweetener, natural sweeteners such as thaumatin and stevia extract, or synthetic sweeteners such as saccharin and aspartame may be used. In general, the content of the natural carbohydrate is approximately 0.01 to approximately 0.04 g/100 ml of the composition of the present invention, preferably approximately 0.02 to approximately 0.03 g/100 ml.
In addition, the composition of the present invention may contain various nutrients, vitamins, an electrolyte, flavors, colorants, pectic acid and salt thereof, organic acid, protective colloidal thickener, pH control agent, stabilizer, preservative, glycerin, alcohol, carbonated agent used in carbonated drinks, and the like. Further, the composition of the present invention may contain natural fruit juice and pulp for preparing fruit juice beverage and vegetable beverage. Such ingredients may be used alone or in combination. The ratio of the additive is not very important, but is generally selected from the range of the weight ratio of 0.01 to 0.1 by 100 weight of the composition of the present invention.
Furthermore, the present invention provides a method for treating a disease, selected form obesity, urinary disorders (such as urinary incontinence, premature ejaculation, erectile dysfunction, and prostatic hyperplasia) and CNS disorders (such as depression, anxiety, concern, panic disorder, epilepsy, obsessive-compulsive disorder, migraine, sleep disorder, withdrawal from drug abuse, Alzheimer's disease, and schizophrenia), associated with 5-HT2c receptors, in a mammal, comprising administering a therapeutically effective amount of an indole carboxylic acid bispyridyl carboxamide derivative or a pharmaceutically acceptable salt thereof, to a mammal in need thereof.
The present invention provides a method for treating a 5-HT2c receptor mediated disease in a mammal, comprising administering therapeutically effective amount of an indole carboxylic acid bispyridyl carboxamide derivative or a pharmaceutically acceptable salt thereof, to a mammal in need thereof.
Also, the present invention provides a use of an indole carboxylic acid bispyridyl carboxamide derivative or a pharmaceutically acceptable salt thereof in a manufacture of a medicament for treating or preventing a disease selected form selected form obesity, urinary disorders (such as urinary incontinence, premature ejaculation, erectile dysfunction, and prostatic hyperplasia) and CNS disorders (such as depression, anxiety, concern, panic disorder, epilepsy, obsessive-compulsive disorder, migraine, sleep disorder, withdrawal from drug abuse, Alzheimer's disease, and schizophrenia), associated with 5-HT2c receptors.
Mode for Invention
Hereinafter, the present invention will be described in more detail with reference to the following examples and experimental examples. However, the following examples and experimental examples are provided for illustrative purposes only, and the scope of the present invention should not be limited thereto in any manner.
PREPARATION EXAMPLE
Example 1
Preparation of benzofuran-3-sulfonic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide




2-methyl-3-hydroxy pyridine (1 g, 9.16 mol) was dissolved in DMF (30 ml) and the solution was stirred with NaH (390 mg, 9.62 mmol) and 2-chloro-5-nitropyridine (1.45 g, 9.16 mmol) at room temperature for 1 hour. And then, the product was filtered and washed, dried under reduced pressures to yield a solid product (2.12 g, 100%). The solid product (2.12 g) was added to a mixed solution of ethanol (62 ml) and hydrochloric acid (16 ml). SnCl2 (7.23 g, 32 mmol) was added to the mixture and stirred for 50 min to 1 hour. Subsequently, the product was filtered, washed, and then dried to prepare a bispyridine ester amine compound (1.63 g, 89%).
Benzofuran (2 g, 16.9 mmol) was added to a solution in which sulfonyl chloride (3.88 g, 28.8 mmol) was dissolved in DMF (6.4 ml) at 0° C., and the mixture was stirred at 85° C. for 3 hours. After the reaction was completed, the product was filtered, washed, and dried to prepare benzofuran-3-sulfonylchloride (6 g, 28 mmol).
The bispyridine ester amine compound (70 mg, 0.35 mmol) and benzofuran-3-sulfonylchloride (75 mg, 0.35 mmol) were dissolved in dichloromethane (5 ml), triethylamine (0.07 g, 0.70 mmol) was added to the solution and the mixture was stirred at room temperature for 2 hours. After the reaction was completed, the product was washed and filtered to yield a target compound as a yellow solid (0.03 g, 23%) by chromatography (methanol:dichloromethane=1:20).
Example 2
Preparation of benzo[b]thiophene-3-sulfonic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide




Sulfuric acid (2 ml, 0.037 mmol) was added to thianaphthene (5 g, 0.037 mmol) in anhydrous acetic acid (4.9 g, 0.048 mmol) at 0° C. The mixture was stirred at room temperature for 3 hours, iced water (30 ml) was added and the mixture was washed with diethylether. Potassium 3-thianaphthene sulfonate (6 g, 0.024 mmol) was obtained from recrystalization of crystals produced by treatment of the water layer with a hot saturated solution of potassium chloride (3 g potassium chloride/30 ml, water). The produced salt (2.5 g, 0.01 mmol) was stirred in a solution of PCl5 (2.9 g, 13.96 mmol) at room temperature for 1 hour. Subsequently, the product was filtered, washed, and dried to obtain benzo[b]thiophene-3-sulfonylchloride.
The bispyridine ester amine compound (120 mg, 0.60 mmol) in Example 1 and benzo[b]thiophene-3-sulfonylchloride (75 mg, 0.35 mmol) were dissolved in dichloromethane (5 ml), triethylamine (0.14 g, 0.60 mmol) was added to the solution and the mixture was stirred at room temperature for 2 hours. After the reaction was completed, the product was washed and filtered to yield a target compound as a white solid (0.34 g, 66%) by chromatography (methanol:dichloromethane=1:20).
Example 3
Preparation of benzofuran-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide




Benzofuran-1,3-dicarboxylic acid (1 g, 4.85 mmol) was heated to 280° C., its boiling temperature, and then was stirred at the temperature for 10 min. The reactant was cooled to room temperature, and then an organic material in acetone was extracted and dried to obtain a yellow solid benzofuran-3-carboxylic acid (100 mg, 0.62 mmol).
The bispyridine ester amine compound (100 mg, 0.50 mmol) in Example 1 and benzofuran-3-carboxylic acid (100 mg, 0.62 mmol) were dissolved in dichloromethane (5 ml), DCC (100 mg, 0.48 mmol) was added to the solution, and the mixture was stirred at 80° C. for 8 hours. After the reaction was completed, the product was washed and filtered to yield a target compound as a white solid (9.3 mg, 10%) by chromatography (methanol:dichloromethane=1:30).
Example 4
Preparation of benzo[b]thiophene-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide




3-bromothianaphthene (1.63 g, 7.65 mmol) was dissolved in anhydrous ether (30 ml) and n-BuLi (2.5 M, 3.5 ml, 8.65 mmol) was added to the solution at −78° C. The mixture was stirred at −78° C. for 10 min, and then the reaction solution was slowly added to an excessive amount of dry ice dissolved in anhydrous ether (140) under nitrogen conditions. The mixture was heated to room temperature for 1 hour, and then stirred at room temperature for another 2 hours. After the reaction was completed, the product was washed, filtered, and dried to obtain benzo[b]thiophene-3-carboxylic acid (805 mg, 4.51 mmol).
The bispyridine ester amine compound (68 mg, 0.34 mmol) in Example 1 and benzo[b]thiophene-3-carboxylic acid (60 mg, 0.34 mmol) were dissolved in DMF (5 ml), HBTU (128 mg, 0.34 mmol) and triethylamine (0.14 ml, 1.01 mmol) were added to the solution, and the mixture was stirred at room temperature for 24 hours. After the reaction was completed, the product was washed and filtered to yield a target compound as a white solid (70 mg, 58%) by chromatography (methanol:dichloromethane=1:30).
Example 5
Preparation of 1H-indole-2-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide




The bispyridine ester amine compound (120 mg, 0.62 mmol) in Example 1 and 1H-indole-2-carboxylic acid (100 ml, 0.62 mmol) were dissolved in DMF (5 ml), HBTU (240 mg, 0.62 mmol) was added to the solution, and the mixture was stirred at 80° C. for 8 hours. After the reaction was completed, the product was washed and filtered to yield a target compound as a brown solid (30 mg, 14%) by chromatography (methanol:dichloromethane=1:30).
Example 6
Preparation of 1H-indole-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide




The bispyridine ester amine compound (100 mg, 0.50 mmol) in Example 1 and indole-3-carboxylic acid (76 mg, 0.47 mmol) were dissolved in DMF (3 ml), DCC (113 mg, 0.55 mmol) was added to the solution, and the mixture was stirred at 80° C. for 3 hours. After the reaction was completed, the product was washed and filtered to yield a target compound as a yellowish solid (80 mg, 47%) by chromatography (methanol:dichloromethane=1:20).
Example 7
Preparation of 1H-benzoimidazole-2-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide




1,2-phenylenediamine (1 g, 9.25 mmol) was dissolved in acetic acid (30 ml), methyltrichloroacetimidate (1.26 ml, 10.18 mmol) was added to the solution at 0° C. and then the mixture was stirred at room temperature. After the reaction was completed, the product was washed, filtered, and dried to obtain 2-trichloromethyl-1H-benzoimidazole. 2-trichloromethyl-1H-benzoimidazole thus obtained was added to 2 N aqueous sodium hydroxide solution (50 ml) at 0° C. and the mixture was stirred at the temperature for 2 hours. The mixture was acidified with 2 N aqueous hydrochloric, acid (pH=3) and the resulting crystals were washed and filtered to obtain 1H-benzoimidazole-2-carboxylic acid (1.2 g, 2-step yield: 80%).
The bispyridine ester amine compound (168 mg, 0.83 mmol) in Example 1 and benzoimidazole-2-carboxylic acid (190 mg, 1.17 mmol) were dissolved in DMF (5 ml), HBTU (402 mg, 1.25 mmol) and triethylamine (0.58 ml, 4.17 mmol) were added to the solution, and the mixture was stirred at room temperature for 24 hours. After the reaction was completed, the product was washed and filtered to yield a target compound as a white solid (247 mg, 86%) by chromatography (methanol:dichloromethane=1:30).
Example 8
Preparation of naphthalene-2-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide




The bispyridine ester amine compound (90 mg, 0.46 mmol) in Example 1 and 2-naphthoic acid (80 mg, 0.46 mmol) were dissolved in DMF (5 ml), DCC (90 mg, 0.46 mmol) was added to the solution, and the mixture was stirred at 60° C. for 8 hours. After the reaction was completed, the product was washed and filtered to yield a target compound as a brown solid (16 mg, 10%) by chromatography (methanol:dichloromethane=1:30).
Example 9
Preparation of (1H-indole-3-ylmethyl)-[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amine




The bispyridine ester amine compound (100 mg, 0.50 mmol) in Example 1 and indole-3-carboxaldehyde (66 mg, 0.45 mmol) were dissolved in 1,2-dichloroethane (3 ml), sodium triacetoxyborohydride (142 mg, 0.64 mmol) and acetic acid (0.03 ml, 0.45 mmol) were added to the solution, and the mixture was stirred at room temperature for 8 hours. After the reaction was completed, the product was washed and filtered to yield a target compound as a colorless liquid (29 mg, 19%) by chromatography (methanol:dichloromethane=2:30)
Example 10
Preparation of 1H-indole-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide




The 1H-indole-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide (0.1 g, 0.29 mmol) in Example 6 was dissolved in toluene (3 ml), and Lawesson s reagent (0.07 g, 0.17 mmol) was added to the solution. The reaction solution was heated to 80° C. for 14 hours, and then the product was washed and filtered to yield a target compound as a white solid (93 mg, 89%) by chromatography (methanol:dichloromethane=1:30).
Example 11
Preparation of 1-methyl-1H-indole-3-carboxylid acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide




The 1H-indole-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide (0.1 g, 0.29 mmol) in Example 6 was dissolved in THF (10 ml), and NaH (6.9 mg, 0.29 mmol) and methyl iodide (0.04 g, 0.29 mmol) were added to the solution. The reaction solution was stirred at room temperature for 8 hours, and then the product was washed and filtered to yield a target compound as a white solid (94 mg, 90%) by chromatography (methanol:dichloromethane=1:30).
Example 12
Preparation of 1H-indole-3-carboxylic acid methyl-[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide




The 1H-indole-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide (0.2 g, 0.58 mmol) in Example 6 was dissolved in dichloromethane (10 ml), and Boc2O (0.15 g, 0.7 mmol) and triethylamine (0.12 g, 1.16 mmol) were added to the solution. The reaction solution was stirred at room temperature for 2 hours, and then the product was washed, filtered, and dried to obtain tert-butyl-3-(6-(2-methylpyridine-3-yloxy)pyridine-3-ylcarbamoyl)-1H-indole-1-carboxylate (0.27 g, 0.52 mmol). The tert-butyl-3-(6-(2-methylpyridine-3-yloxy)pyridine-3-ylcarbamoyl)-1H-indole-1-carboxylate (0.27 g, 0.52 mmol) was dissolved in THF (10 ml), and NaH (21 mg, 0.54 mmol) and methyl iodide (0.95 g, 0.67 mmol) were added to the solution. The reaction solution was stirred at room temperature for 5 hours, and then the product was washed and filtered to yield tert-butyl-3-(methyl(6-(2-methylpyridine-3-yloxy)pyridine-3-yl)carbamoyl)-1H-indole-1-carboxylate (40 mg, 0.087 mmol) by chromatography (methanol:dichloromethane=1:20).
The tert-butyl-3-(methyl(6-(2-methylpyridine-3-yloxy)pyridine-3-yl)carbamoyl)-1H-indole-1-carboxylate (40 mg, 0.087 mmol) was added to a mixed solution of dichloromethane (1 ml) and TFA (1 ml), and the mixture was stirred at room temperature for 1 hour. Subsequently, the product was filtered, washed, and dried to yield a target compound as a white solid (28 mg, 90%)
Example 13
Preparation of 1-methyl-1H-indole-3-carboxylic acid methyl-[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide




The tert-butyl-3-(methyl(6-(2-methylpyridine-3-yloxy)pyridine-3-yl)carbamoyl)-1H-indole-1-carboxylate (40 mg, 0.087 mmol) in Example 12 was dissolved in THF (10 ml), and NaH (21 mg, 0.54 mmol) and methyl iodide (0.95 g, 0.67 mmol) were added to the solution. The reaction solution was stirred at room temperature for 5 hours, and then the product was washed and filtered to yield a target compound as a brown solid (20 mg, 12%) by chromatography (methanol:dichloromethane=1:20).
Example 14
Preparation of 5-methyl-1H-indole-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide




5-methyl indole (1 g, 7.62 mmol) was dissolved in DMF (20 ml), and then trifluoroacetic anhydride (2.1 ml, 15.24 mmol) was added to the solution, and the mixture was stirred at room temperature for 2 hours. Subsequently, the product was filtered, washed, and dried to prepare 2,2,2-trifluoro-1-(5-methyl-1H-indole-3-yl)ethanone (1.7 g, 7.47 mmol).
The 2,2,2-trifluoro-1-(5-methyl-1H-indole-3-yl)ethanone (0.25 g, 1.10 mmol) was dissolved in 20% aqueous sodium hydroxide solution (5 ml) and the mixture was stirred at 50° C. for 8 hours. Subsequently, the product was filtered, washed, and dried to prepare 5-methyl-1H-indole-3-carboxylic acid (0.14 g, 0.84 mmol).
The bispyridine ester amine compound (100 mg, 0.50 mmol) in Example 1 and 5-methyl-1H-indole-3-carboxylic acid (100 mg, 0.57 mmol) were dissolved in DMF (3 ml), DCC (100 mg, 0.55 mmol) was added to the solution, and then the mixture was stirred at 80° C. for 8 hours. After the reaction was completed, the product was washed and filtered to yield a target compound as a white solid (90 mg, 44%) by chromatography (methanol:dichloromethane=1:30).
Example 15
Preparation of 5-methoxy-1H-indole-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide




5-methoxy indole (1 g, 6.8 mmol) was dissolved in DMF (30 ml), and then trifluoroacetic anhydride (2.9 g, 13.6 mmol) was added to the solution, and the mixture was stirred at 60° C. for 1 hour. Subsequently, the product was filtered, washed, and dried to prepare 2,2,2-trifluoro-1-(5-methoxy-1H-indole-3-yl)ethanone (1.5 g, 6.19 mmol).
The 2,2,2-trifluoro-1-(5-methoxy-1H-indole-3-yl)ethanone (1 g, 4.13 mmol) was dissolved in 20% aqueous sodium hydroxide solution (15 ml) and the mixture was stirred at 60° C. for 3 hours. Subsequently, the product was filtered, washed, and dried to prepare 5-methoxy-1H-indole-3-carboxylic acid (0.7 g, 3.35 mmol).
The bispyridine ester amine compound (100 mg, 0.50 mmol) in Example 1 and 5-methoxy-1H-indole-3-carboxylic acid (140 mg, 0.75 mmol) were dissolved in DMF (10 ml), DCC (100 mg, 0.55 mmol) was added to the solution, and then the mixture was stirred at 80° C. for 8 hours. After the reaction was completed, the product was washed and filtered to yield a target compound as a colorless liquid (20 mg, 11%) by chromatography (methanol:dichloromethane=1:30).
Example 16
Preparation of 6-methyl-1H-indole-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide




6-methyl indole (0.5 g, 3.81 mmol) was dissolved in DMF (5 ml), and then trifluoroacetic anhydride (1.6 g, 7.62 mmol) was added to the solution, and the mixture was stirred at room temperature for 4 hours. Subsequently, the product was filtered, washed, and dried to prepare 2,2,2-trifluoro-1-(6-methyl-1H-indole-3-yl)ethanone (0.85 g, 3.73 mmol).
The 2,2,2-trifluoro-1-(6-methyl-1H-indole-3-yl)ethanone (0.5 g, 2.20 mmol) was dissolved in 20% aqueous sodium hydroxide solution (5 ml) and the mixture was stirred at 60° C. for 3 hours. Subsequently, the product was filtered, washed, and dried to prepare 6-methyl-1H-indole-3-carboxylic acid (0.3 g, 1.72 mmol).
The bispyridine ester amine compound (100 ml, 0.50 mmol) in Example 1 and 6-methyl-1H-indole-3-carboxylic acid (100 mg, 0.57 mmol) were dissolved in DMF (5 ml), DCC (100 ml, 0.55 mol) was added to the solution, and then the mixture was stirred at 80° C. for 8 hours. After the reaction was completed, the product was washed and filtered to yield a target compound as a white solid (93 mg, 45%) by chromatography (methanol:dichloromethane=1:30).
Example 17
Preparation of 7-methyl-1H-indole-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide




7-methyl indole (0.5 g, 3.81 mmol) was dissolved in DMF (5 ml), and then trifluoroacetic anhydride (1.6 g, 7.62 mmol) was added to the solution, and the mixture was stirred at room temperature for 4 hours. Subsequently, the product was filtered, washed, and dried to prepare 2,2,2-trifluoro-1-(7-methyl-1H-indole-3-yl)ethanone (0.8 g, 3.52 mmol).
The 2,2,2-trifluoro-1-(7-methyl-11H-indole-3-yl)ethanone (0.5 g, 2.20 mmol) was dissolved in 20% aqueous sodium hydroxide solution (5 ml) and the mixture was stirred at 60° C. for 3 hours. Subsequently, the product was filtered, washed, and dried to prepare 7-methyl-1H-indole-3-carboxylic acid (0.3 g, 1.72 mmol).
The bispyridine ester amine compound (200 mg, 0.99 mmol) in Example 1 and 7-methyl-1H-indole-3-carboxylic acid (170 mg, 0.99 mmol) were dissolved in DMF (5 ml), DCC (230 mg, 1.09 mmol) was added to the solution, and then the mixture was stirred at 80° C. for 8 hours. After the reaction was completed, the product was washed and filtered to yield a target compound as a white solid (30 ml, 7%) by chromatography (methanol:dichloromethane=1:30).
Example 18
Preparation of 5-iodo-1H-indole-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide




5-iodo indole (1.0 g, 4.11 mmol) was dissolved in DMF (30 ml), and then trifluoroacetic anhydride (1.7 g, 8.22 mmol) was added to the solution, and the mixture was stirred at room temperature for 1 hour. Subsequently, the product was filtered, washed, and dried to prepare 2,2,2-trifluoro-1-(5-iodo-1H-indole-3-yl)ethanone (1.9 g, 2.96 mmol).
The 2,2,2-trifluoro-1-(5-iodo-1H-indole-3-yl)ethanone (0.5 g, 1.47 mmol) was dissolved in 20% aqueous sodium hydroxide solution (5 ml) and the mixture was stirred at 60° C. for 3 hours. Subsequently, the product was filtered, washed, and dried to prepare 5-iodo-1H-indole-3-carboxylic acid (0.35 g, 1.22 mmol).
The bispyridine ester amine compound (100 mg, 0.50 mmol) in Example 1 and 5-iodo-1H-indole-3-carboxylic acid (100 ml, 0.50 mmol) were dissolved in DMF (5 ml), DCC (100 ml, 0.55 mmol) was added to the solution, and then the mixture was stirred at 80° C. for 8 hours. After the reaction was completed, the product was washed and filtered to yield a target compound as a white solid (18 mg, 11%) by chromatography (methanol:dichloromethane=1:30).
Example 19
Preparation of 1H-indole-3-carboxylic acid[6-(pyrimidin-5-yloxy)-pyridine-3-yl]-amide




5-bromopyrimidine (5.0 g, 31.4 mmol) and sodium methoxide (1.99 g, 34.9 mmol) were dissolved in MeOH (50 ml), and the mixture was heated in a sealed tube at 150° C. for 24 hours. After the reaction was completed, the product was washed and filtered to prepare 5-methoxy pyrimidine (1.9 g, 2.96 mmol) by chromatography (ethyl acetate:n-hexane=1:1).
NaH (0.91 g, 22.8 mmol) was dissolved in DMF (15 ml), ethanethiol (0.84 ml, 11.4 mmol) was added to the solution, and the mixture was stirred at room temperature for 30 min. 5-methoxy pyrimidine (628 mg, 5.65 mmol) was added to the mixture and stirred at 100° C. for 4 hours. Subsequently, the product was filtered, washed, and dried to prepare pyrimidine-5-ol (681 mg, 5.65 mmol).
Pyrimidine-5-ol (0.39 g, 4.02 mmol) was dissolved in DMF (10 ml), and the solution was stirred with NaH (210 mg, 5.23 mmol) and 2-chloro-5-nitro pyridine (0.64 g, 4.04 mmol) at room temperature for 1 hour. Subsequently, the product was filtered, washed, and dried under reduced pressures to yield a solid product (0.77 g, 87%). The solid product (0.2 g, 0.92 mmol) was added to a mixed solution of ethanol (7 ml) and conc. hydrochloric acid (2 ml), SnCl2 (0.72 g, 3.22 mmol) was added to the mixture, and the resulting solution was stirred at 60° C. for 1 hour. And then the product was filtered, washed, and dried to prepare 6-(pyrimidine-5-yloxy)-pyridine-3-ylamine (0.17 g, 96%).
The 6-(pyrimidine-5-yloxy)-pyridine-3-ylamine (53 mg, 0.28 mmol) and indole-3-carboxylic acid (45 mg, 0.28 mmol) were dissolved in DMF (5 ml), DCC (58 mg, 0.28 mmol) was added to the solution, and then the mixture was stirred at 80° C. for 8 hours. After the reaction was completed, the product was washed and filtered to yield a target compound as a white solid (55 mg, 59%) by chromatography (methanol:dichloromethane=2:30).
Example 20
Preparation of 1H-indole-3-carboxylic acid[6-(pyridine-2-ylmethoxy)-pyridine-3-yl]-amide




2-pyridinemethanol (2.43 g, 22.3 mmol) was dissolved in DMF (30 ml), and the solution was stirred with NaH (790 mg, 19.8 mmol) and 2-chloro-5-nitro pyridine (3.19 g, 20.1 mmol) at room temperature for 1 hour. Subsequently, the product was filtered, washed, and dried under reduced pressures to yield a solid product (3.47 g, 67%). The solid product (3.72 g, 16.1 nmol) was added to a mixed solution of ethanol (90 ml) and conc. hydrochloric acid (28 ml), SnCl2 (12.7 g, 56.3 mmol) was added to the mixture, and the resulting solution was stirred at 50° C. for 1 hour. And then the product was filtered, washed, and dried to prepare 6-(pyridine-2-ylmethoxy)-pyridine-3-ylamine (3.42 g, 100%).
The 6-(pyridine-5-ylmethoxy)-pyridine-3-ylamine (114 mg, 0.57 mmol) and indole-3-carboxylic acid (91 mg, 0.57 mmol) were dissolved in DMF (3 ml), DCC (117 mg, 0.57 mmol) was added to the solution, and then the mixture was stirred at 80° C. for 8 hours. After the reaction was completed, the product was washed and filtered to yield a target compound as a white solid (44 mg, 23%) by chromatography (methanol:dichloromethane=2:30).
Example 21
Preparation of 1H-indole-3-carboxylic acid[6-(6-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide




6-methylpyridine-3-ol (1.0 g, 9.16 mmol) was dissolved in is DMF (20 ml), and the solution was stirred with NaH (230 mg, 9.6 mmol) and 2-chloro-5-nitro pyridine (1.45 g, 9.16 mmol) at room temperature for 1 hour. Subsequently, the product was filtered, washed, and dried under reduced pressures to yield a solid product (2.08 g, 98%). The solid product (1.0 g, 4.32 mmol) was added to a mixed solution of ethanol (80 ml) and conc. hydrochloric-acid (20 ml), SnCl2 (2.9 g, 15.12 mmol) was added to the mixture, and the resulting solution was stirred at 50° C. for 1 hour. And then the product was filtered, washed, and dried to prepare 6-(6-methylpyridine-3-yloxy)-pyridine-3-amine (0.73 g, 84%).
The 6-(6-methylpyridine-3-yloxy)-pyridine-3-amine (300 mg, 1.49 mmol) and indole-3-carboxylic acid (240 mg, 1.49 mmol) were dissolved in DMF (10 ml), DCC (280 mg, 1.49 mmol) was added to the solution, and then the mixture was stirred at 80° C. for 3 hours. After the reaction was completed, the product was washed and filtered to yield a target compound as a grey solid (340 mg, 66%) by chromatography (methanol:dichloromethane=1:30).
Example 22
Preparation of 1H-indole-3-carboxylic acid[6-(2-chloro-pyridine-3-yloxy)-pyridine-3-yl]-amide




2-chloropyridine-3-ol (1.0 g, 7.72 mmol) was dissolved in DMF (20 ml), and the solution was stirred with NaH (200 mg, 8.1 mmol) and 2-chloro-5-nitro pyridine (1.2 g, 7.72 mmol) at room temperature for 1 hour. Subsequently, the product was filtered, washed, and dried under reduced pressures to yield a solid product (1.88 g, 97%). The solid product (1.80 g, 7.15 mmol) was added to a mixed solution of ethanol (20 ml) and conc. hydrochloric acid (5 ml), SnCl2 (4.06 g, 21.45 mmol) was added to the mixture, and the resulting solution was stirred at 50° C. for 1 hour. And then the product was filtered, washed, and dried to prepare 6-(2-chloropyridine-3-yloxy)-pyridine-3-amine (1.42 g, 90%).
The 6-(2-chloropyridine-3-yloxy)-pyridine-3-amine (200 mg, 0.9 mmol) and indole-3-carboxylic acid (150 mg, 0.9 mmol) were dissolved in DMF (5 ml), DCC (200 mg, 0.99 mmol) was added to the solution, and then the mixture was stirred at 70° C. for 8 hours. After the reaction was completed, the product was washed and filtered to yield a target compound as a white solid (200 mg, 61%) by chromatography (methanol:dichloromethane=1:30).
Example 23
Preparation of 1H-indole-3-carboxylic acid[6-(2-bromo-pyridine-3-yloxy)-pyridine-3-yl]-amide




2-bromopyridine-3-ol (1.0 g, 5.75 mmol) was dissolved in DMF (20 ml), and the solution was stirred with NaH (242 mg, 6.04 mmol) and 2-chloro-5-nitro pyridine (0.9 g, 5.75 mmol) at room temperature for 8 hours. Subsequently, the product was filtered, washed, and dried under reduced pressures to yield a solid product (1.7 g, 99%). The solid product (1.5 g, 5.08 mmol) was added to a mixed solution of ethanol (20 ml) and conc. hydrochloric acid (5 ml), SnCl2 (2.19 g, 15.2 mmol) was added to the mixture, and the resulting solution was stirred at 50° C. for 3 hours. And then the product was filtered, washed, and dried to prepare 6-(2-bromopyridine-3-yloxy)pyridine-3-amine (1.11 g, 82%)
The 6-(2-bromopyridine-3-yloxy)pyridine-3-amine (200 ml, 1.24 mmol) and indole-3-carboxylic acid (200 mg, 1.24 mmol) were dissolved in DMF (5 ml), DCC (280 mg, 1.37 mmol) was added to the solution, and then the mixture was stirred at 60° C. for 8 hours. After the reaction was completed, the product was washed and filtered to yield a target compound as a white solid (100 mg, 20%) by chromatography (methanol:dichloromethane=1:30).
Example 24
Preparation of 1H-indole-3-carboxylic acid[6-(pyridine-3-yloxy)-pyridine-3-yl]-amide




Pyridine-3-ol (1.0 g, 10.51 mmol) was dissolved in DMF (20 ml), and the solution was stirred with NaH (422 mg, 10.51 mmol) and 2-chloro-5-nitro pyridine (1.7 g, 10.51 mmol) at room temperature for 8 hours. Subsequently, the product was filtered, washed, and dried under reduced pressures to yield a solid product (2.0 g, 88%). The solid product (1.6 g, 7.37 mmol) was added to a mixed solution of ethanol (20 ml) and conc. hydrochloric acid (5 ml), SnCl2 (4.19 g, 22.11 mmol) was added to the mixture, and the resulting solution was stirred at 50° C. for 3 hours. And then the product was filtered, washed, and dried to prepare 6-(pyridine-3-yloxy)pyridine-3-amine (1.24 g, 90%).
The 6-(pyridine-3-yloxy)pyridine-3-amine (200 mg, 1.24 mmol) and indole-3-carboxylic acid (200 mg, 1.24 mmol) were dissolved in DMF (5 ml), DCC (280 mg, 1.37 mmol) was added to the solution, and then the mixture was stirred at 60° C. for 8 hours. After the reaction was completed, the product was washed and filtered to yield a target compound as a white solid (250 mg, 61%) by chromatography (methanol:dichloromethane=1:30).
Example 25
Preparation of 1H-indole-3-carboxylic acid(6-phenoxy-pyridine-3-yl)-amide




Phenol (1.0 g, 10.6 mmol) was dissolved in DMF (20 ml), and the solution was stirred with NaH (430 mg, 10.51 mmol) and 2-chloro-5-nitro pyridine (1.68 g, 10.6 mmol) at room temperature for 8 hours. Subsequently, the product was filtered, washed, and dried under reduced pressures to yield a solid product (1.7 g, 99%). The solid product (2.0 g, 9.25 mmol) was added to a mixed solution of ethanol (20 ml) and conc. hydrochloric acid (5 ml), SnCl2 (5.26 g, 27.75 mmol) was added to the mixture, and the resulting solution was stirred at 50° C. for 3 hours. And then the product was filtered, washed, and dried to prepare 6-phenoxypyridine-3-amine (1.5 g, 87%).
The 6-phenoxypyridine-3-amine (200 mg, 1.07 mmol) and indole-3-carboxylic acid (200 mg, 1.07 mmol) were dissolved in DMF (5 ml), DCC (200 mg, 1.07 mmol) was added to the solution, and then the mixture was stirred at 60° C. for 8 hours. After the reaction was completed, the product was washed and filtered to yield a target compound as a white solid (60 mg, 17%) by chromatography (methanol:dichloromethane=1:30).
Example 26
Preparation of 1H-indole-3-carboxylic acid pyridine-3-ylamide




3-aminopyridine (290 mg, 3.1 mmol) and indole-3-carboxylic acid (500 mg, 3.1 mmol) was dissolved in DMF (20 ml), DCC (579 mg, 3.1 mmol) was added to the solution, and then the mixture was stirred at 60° C. for 8 hours. After the reaction was completed, the product was washed and filtered to yield a target compound as a white solid (300 mg, 42%) by chromatography (methanol:dichloromethane=1:20).
Example 27
Preparation of 1H-indole-3-carboxylic acid (4-pyridine-3-yl-phenyl)-amide




3-pyridineboronic acid (0.3 g, 2.44 mmol), 1-iodo-3-nitrobenzene (0.61 g, 2.44 mmol), sodium carbonate (0.78 g, 7.32 mmol), and Pd(PPh3)4 (0.28 g, 0.24 mmol) were dissolved in a mixed solvent of 1,2-dimethoxyethane (50 ml) and water (13 ml), and the solution was refluxed for 12 hours. Subsequently, the product was filtered, washed, and dried under reduced pressures to yield a solid product. The solid product was added to a mixed solution of ethanol (20 ml) and conc. hydrochloric acid (6 ml), SnCl2 (1.92 g, 10.13 mmol) was added to the mixture, and the resulting solution was stirred at 60° C. for 1 hour. And then the product was filtered, washed, and dried to prepare 3-pyridine-3-yl-phenylamine.
The crude 3-pyridine-3-yl-phenylamine (60 mg, 0.35 mmol) and indole-3-carboxylic acid (57 mg, 0.35 mmol) were dissolved in DMF (3 ml), DCC (73 mg, 0.35 mmol) was added to the solution, and then the mixture was stirred at 80° C. for 8 hours. After the reaction was completed, the product was washed and filtered to yield a target compound as a white solid (60 mg, 55%) by chromatography (methanol:dichloromethane=1:20).
Example 28
Preparation of 6-methyl-1H-indole-3-carboxylic acid[6-(2-chloro-pyridine-3-yloxy)-pyridine-3-yl]-amide




The 6-methyl-1H-indole-3-carboxylic acid (50 mg, 0.28 mmol) in Example 16 and the 6-(2-chloropyridine-3-yloxy)-pyridine-3-amine (60 mg, 0.28 mmol) in Example 22 were dissolved in DMF (5 ml), HBTU (100 mg, 0.28 mmol) and triethylamine (0.11 ml, 0.84 mmol) were added to the solution, and the mixture was stirred at 80° C. for 8 hours. After the reaction was completed, the product was washed and filtered to yield a target compound as a white solid (18 ml, 34%) by chromatography (methanol:dichloroinethane=1:30).
Example 29
Preparation of 1H-indole-3-carboxylic acid[4-(4,6-dimethoxy-[1,3,5]triazine-2-ylxoxy)-phenyl]-amide




4-nitrophenol (1.0 g, 7.2 mmol) was dissolved in DMF (30 ml), and the solution was stirred with NaH (290 mg, 7.2 mmol) and 2-chloro-4,6-dimethoxytriazine (3.19 g, 20.1 mmol) at room temperature for 3 hours. Subsequently, the product was filtered, washed, and dried under reduced pressures to yield a liquid product (1.54 g, 75%). The liquid product (1.0 g, 3.6 mmol) was added to a mixed solution of THF (20 ml), water (2 ml), and acetic acid (1.7 ml), Fe (1.98 g, 36 mmol) was added to the mixture, and the resulting solution was stirred at 70° C. for 12 hours. And then the product was filtered, washed, and dried to prepare 4-(4,6-dimethoxy-[1,3,5]triazine-2-yloxy)-phenylamine (0.89 g, 91%).
The 4-(4,6-dimethoxy-[1,3,5]triazine-2-yloxy)-phenylamine (213 mg, 0.86 mmol) and indole-3-carboxylic acid (58 mg, 0.86 mmol) were dissolved in DMF (5 ml), DCC (74 mg, 0.86 mmol) was added to the solution, and then the mixture was stirred at 80° C. for 8 hours. After the reaction was completed, the product was washed and filtered to yield a target compound as a white solid (110 mg, 33%) by chromatography (methanol:dichloromethane=1:30).
The state, yield, melting point, and 1H NMR of piperidine derivatives represented by Formula (1), obtained by methods in Examples of the present invention are summarized in Table 1, below.












TABLE 1





Classification
state
Yield (%)
mp (° C.)
MS (EI)
1H NMR Data




















Example 1
yellow
23
128-129
m/e
1H NMR (200 MHz, CDCl3) δ 2.47 (s, 3H, CH3), 7.00 (d, J = 8.6 Hz,



solid


381.1 [M]+
1H, ArH), 7.18-7.34 (m, 2H, ArH), 7.43 (m, 3H,







ArH), 7.61-7.78 (m, 3H, ArH), 8.15 (s, 1H, NH), 8.39 (s,







1H, ArH), 8.45 (s, 1H, ArH)


Example 2
white
66
93-95
m/e
1H NMR (200 MHz, CDCl3) δ 2.40 (s, 3H, CH3),



solid


397.1 [M]+
7.29-7.56 (m, 7H, ArH), 7.90 (d, J = 7.2 Hz, 3H, ArH), 8.48 (s, 1H,







ArH)


Example 3
white
10
52-55
m/e
1H NMR (200 MHz, CDCl3) δ 2.44 (s, 3H, CH3), 6.99 (d, J = 8.6 Hz,



solid


346.11 [M + H]+
1H, ArH), 7.18-7.26 (m, 1H, ArH),







7.33-743 (m, 3H, ArH), 7.54-7.58 (m, 1H, NH), 8.0-8.05 (m, 1H,







ArH), 8.14 (s, 1H, ArH), 8.24-8.30 (m, 3H, ArH),







8.38-8.40 (m, 1H, NH)


Example 4
white
58
81-83
m/e
1H NMR (200 MHz, CDCl3) δ 2.46 (s, 3H, CH3), 7.03 (d, J = 8.9 Hz,



solid


361.1 [M]+
1H, ArH), 7.18 (m, 1H, ArH), 7.45 (m, 3H, ArH),







7.79 (s, 1H, ArH), 7.90 (m, 1H, ArH), 8.04 (s, 1H, NH),







8.20 (d, J = 2.4 Hz, 1H, ArH), 8.30 (m, 1H, ArH), 8.40 (m,







2H, ArH)


Example 5
brown
14
215-217
m/e
1H NMR (200 MHz, CDCl3) δ 2.45 (s, 3H, CH3),



solid


344.08 [M + H]+
6.96-7.01 (m, 1H, ArH), 7.10-7.48 (m, 7H, ArH), 7.67 (d, J = 7.6 Hz,







1H, ArH), 8.29-8.37 (m, 3H, ArH)


Example 6
yellow
47
108-110
m/e
1H NMR (200 MHz, CDCl3) δ 2.46 (s, 3H, CH3), 7.00 (d, J = 8.95 Hz,



solid


344.1 [M]+
1H, ArH), 7.32 (m, 4H, ArH), 7.70 (br s, 1H, NH),







7.90 (d, J = 2.85 Hz, 1H, ArH), 8.05 (m, 1H, ArH),







8.21 (d, J = 2.44 Hz, 1H, ArH), 8.31 (dc, J = 2.64, 8.75 Hz,







1H, ArH), 8.37 (d, J = 4.48 Hz, ArH), 8.80 (br s, 1H, NH)


Example 7
white
86
191-193
m/e
1H NMR (300 MHz, d6-DMSO) δ 2.33 (s, 3H, CH3), 7.19 (d, J = 8.88 Hz,



solid


345.0 [M]+
1H, ArH), 7.33 (m, 3H, ArH), 7.53 (dd, J = 1.38,







8.13 Hz, 1H, ArH), 7.70 (br s, 1H, ArH), 8.48 (m,







2H, ArH), 8.63 (s, 1H, ArH)


Example 8
brown
10
156-158
m/e
1H NMR (200 MHz, CDCl3) δ 2.46 (s, 3H, CH3), 7.03 (d, J = 8.4 Hz,



solid


356.08 [M + H]+
1H, ArH), 7.18-7.27 (m, 2H, ArH), 7.40 (d, J = 8.2 Hz,







1H, ArH), 7.60 (t, J = 3.6 Hz, 3H, ArH),







7.90-8.06 (m, 1H, ArH), 8.27-8.41 (m, 5H, ArH)


Example 9
colorless
19

m/e
1H NMR (200 MHz, CDCl3) d 2.49 (s, 3H, CH3), 4.46 (s, 2H,



liquid


331.09 [M + H]+
CH2), 6.83 (m, 1H, ArH), 6.99-7.41 (m, 7H, ArH), 7.65 (m,







2H, ArH), 8.29 (m, 1H, ArH), 8.39 (br s, 1H, NH)


Example
white
89
120-123
m/e
1H NMR (200 MHz, CDCl3) d 2.47 (s, 3H, CH3), 7.00 (d, J = 8.6 Hz,


10
solid


360.4 [M]+
1H, ArH), 7.21-7.46 (m, 5H, ArH), 7.66 (s, 1H, NH),







7.90 (d, J = 2.8 Hz, 1H, ArH), 8.05 (m, 1H, ArH),







8.21-8.40 (m, 3H, ArH), 8.73 (s, 1H, NH)


Example
white
90
255-257
m/e
1H NMR (200 MHz, CDCl3) d 2.47 (s, 3H, CH3), 3.83 (s, 3H,


11
solid


358.2 [M]+
NCH3), 7.00 (d, J = 8.6 Hz, 1H, ArH), 7.20-7.41 (m, 5H,







ArH), 7.60 (s, 1H, NH), 7.70 (s, 1H, ArH), 8.02 (m, 1H,







ArH), 8.20 (d, J = 2.4 Hz, 1H, ArH), 8.30 (d, J = 9.0 Hz,







1H, ArH), 8.40 (d, J = 1.6 Hz, 1H, ArH)


Example
white
90
95-96
m/e
1H NMR (300 MHz, d6-DMSO) d 2.35 (s, 3H, CH3), 3.50 (s, 3H,


12
solid


358.2 [M]+
NCH3), 6.76 (d, J = 2.8 Hz, 1H, ArH), 6.90 (d, J = 9.0 Hz,







1H, ArH), 7.27 (m, 5H, ArH), 7.60 (d, J = 6.2 Hz, 1H, ArH),







7.98 (m, 2H, ArH), 8.37 (d, J = 3.2 Hz, 1H, ArH)


Example
brown
12
116-118
m/e
1H NMR (200 MHz, CDCl3) d 2.35 (s, 3H, CH3), 2.50 (s, 3H,


13
solid


372.2 [M]+
NCH3), 3.65 (s, 3H, NCH3), 6.63 (s,, 1H, ArH), 6.90 (d, J = 8.8 Hz,







1H, ArH), 7.19 (m, 4H, ArH), 7.36 (d, J = 7.0 Hz,







1H, ArH), 7.63 (d, J = 3.0 Hz, 1H, ArH), 7.90 (d, J = 7.6 Hz,







1H, ArH), 8.00 (d, J = 2.4 Hz, 1H, ArH), 8.37 (d, J = 3.6 Hz,







1H, ArH)


Example
white
44
244-245
m/e
1H NMR (200 MHz, CDCl3) d 2.46 (s, 3H, CH3), 2.47 (s, 3H,


14
solid


359.10 [M + H]+
CH3), 6.96 (d, J = 8.6 Hz, 1H, ArH), 7.07 (d, J = 8.2 Hz,







1H, ArH), 7.23-7.43 (m, 4H, ArH), 7.95 (d, J = 13.4 Hz,







2H, ArH), 8.28 (d, J = 6.6 Hz, 2H, ArH)


Example
colorless
$$

m/e
1H NMR (200 MHz, CDCl3) d 2.37 (s, 3H, CH3), 3.77 (s, 3H,


15
liquid


375.02 [M + H]+
OMc), 6.84-6.92 (m, 2H, ArH), 7.09-7.13 (m, 1H, ArH),







7.20-7.32 (m, 1H, ArH), 7.67 (d, J = 13.8 Hz, 2H, ArH),







8.14-8.28 (m, 4H, ArH) 8.41 (s, 1H, NH), 9.67 (s, 1H,







NH)


Example
white
45
203-206
m/e
1H NMR (200 MHz, CDCl3) d 2.45 (s, 3H, CH3), 2.48 (s, 3H,


16
solid


359.09 [M + H]+
CH3), 6.98 (d, J = 8.8 Hz, 1H, ArH), 7.12-7.26 (m, 2H,







ArH), 7.20 (d, J = 8.1 Hz, 1H, ArH), 7.80 (d, J = 2.8 Hz,







2H, ArH), 7.90 (d, J = 8 Hz, 1H, ArH), 8.19-8.38 (m, 3H,







ArH)


Example
white
7
204-207
m/e
1H NMR (200 MHz, CDCl3) d 2.47 (s, 3H, CH3), 2.65 (s, 3H,


17
solid


359.09 [M + H]+
CH3), 7.00 (d, J = 9 Hz, 1H, ArH), 7.11-7.29 (m, 2H,







ArH), 7.40 (d, J = 8 Hz, 1H, ArH), 7.65 (s, 1H, ArH),







7.86 (d, J = 7.8 Hz, 1H, ArH), 7.92 (d, J = 2.8 Hz, 1H, ArH),







8.21 (d, J = 2.4 Hz, 1H, NH), 8.31 (d, J = 6 Hz, 1H, ArH),







8.38 (d, J = 4.4 Hz, 1H, ArH), 8.63 (s, 1H, NH)


Example
white
11
230-232
m/e
1H NMR (200 MHz, CDCl3) d 2.46 (s, 3H, CH3), 7.0 (d, J = 8.4 Hz,


18
solid


470.0 [M]+
1H, ArH), 7.21 (d, J = 2.8 Hz, 1H, ArH), 7.27 (d,







J = 5.2 Hz, 1H, ArH), 7.45 (m, 3H, ArH), 7.95 (s, 1H,







ArH), 8.31 (m, 3H, ArH), 8.61 (d, J = 7.2 Hz, 1H, ArH)


Example
white
59
134-137
m/e
1H NMR (200 MHz, d6-DMSO) d 7.20 (m, 4H, ArH), 7.46 (d, J = 8.1 Hz,


19
solid


331.2 [M]+, 302.1,
1H, ArH), 8.15 (d, J = 6.9 Hz, 1H, ArH),






275.1
8.30 (m, 2H, ArH), 8.47 (s, 1H, ArH), 8.75 (s, 1H, ArH),







9.04 (s, 1H, ArH), 9.95 (s, 1H, NH), 11.79 (s, 1H, NH)


Example
white
23
220-222
m/e
1H NMR (200 MHz, d6-DMSO) d 5.40 (s, 2H, CH2), 6.95 (d, J = 9.4 Hz,


20
solid


344.1 [M]+, 327.2,
1H, ArH), 7.15 (m, 2H, ArH), 7.33 (m, 1H, ArH),






297.2
7.44 (m, 2H, ArH), 7.78 (m, 1H, ArH), 8.11 (m, 2H, ArH),







8.24 (s, 1H, ArH), 8.45 (d, J = 2.8 Hz, 1H, ArH), 8.55 (d,







J = 4.9 Hz, 1H, ArH), 9.78 (s, 1H, NH), 11.74 (s, 1H, NH)


Example
gray
66
109-110
m/e
1H NMR (200 MHz, CDCl3) d 2.50 (s, 3H, CH3), 6.90 (d, J = 8.2 Hz,


21
solid


344.1 [M]+
1H, ArH), 7.11 (d, J = 8.2 Hz, 1H, ArH), 7.29 (m,







3H, ArH), 7.80 (s, 1H, ArH), 8.13 (m, 4H, ArH), 8.31 (s,







1H, ArH)


Example
white
61
191-192
m/e
1H NMR (200 MHz, CDCl3) d 7.07 (d, J = 9.1 Hz, 1H, ArH),


22
solid


365.07 [M + H]+
7.24-7.48 (m, 5H, ArH), 7.60 (d, J = 6.6 Hz, 1H, ArH),







7.97 (s, 1H, NH), 8.14-8.37 (m, 3H, ArH), 8.37 (d, 1H,







ArH), 8.96 (s, 1H, NH)


Example
white
20
173-180
m/e
1H NMR (200 MHz, CDCl3) d 7.05 (d, J = 8.6 Hz, 1H, ArH),


23
solid


410.84 [M + H]
7.24-7.54 (m, 6H, ArH), 7.93 (s, 1H, ArH), 8.16 (s, 1H,







ArH), 8.24 (s, 1H, ArH), 8.34 (d, J = 9 Hz, 1H, ArH)


Example
white
61
106-109
m/e
1H NMR (200 MHz, CDCl3) d 7.03 (d, J = 8.6 Hz, 1H, ArH),


24
solid


331.15 [M + H]+
7.31-7.34 (m, 3H, ArH), 7.49-7.53 (m, 2H, ArH),







7.85 (d, J = 14.4 Hz, 2H, ArH), 8.05 (s, 1H, NH), 8.29 (d, J = 9 Hz,







2H, ArH), 8.48 (d, J = 10.6 Hz, 2H, ArH), 8.9 (s,







1H, NH)


Example
white
17
205-206
m/e
1H NMR (200 MHz, CDCl3) d 6.94 (d, J = 6.6 Hz, 1H, ArH),


25
solid


330.34 [M + H]+
7.11-7.49 (m, 8H, ArH), 7.98 (s, 1H, ArH), 8.17 (t, J = 3.4 Hz,







1H, ArH), 8.23 (s, 1H, ArH), 8.39 (d, J = 9 Hz,







1H, ArH)


Example
white
42
236-239
m/e
1H NMR (200 MHz, CDCl3) d 7.27-7.49 (m, 4H, ArH), 7.98 (s,


26
solid


238.14 [M + H]+
1H, ArH), 8.16 (t, J = 3.4 Hz, 1H, ArH), 8.28 (d, J = 4.6 Hz,







1H, ArH), 8.43 (d, J = 8.4 Hz, 1H, ArH), 8.60 (s, 1H,







ArH)


Example
white
55
69-71
m/e
1H NMR (300 MHz, d6-DMSO) d 7.18 (m, 2H, ArH), 7.40 (d, J = 7.8 Hz,


27
solid


313.1 [M]+, 284.1,
1H, ArH), 7.50 (m, 4H, ArH), 7.83 (d, J = 8.4 Hz,






257.1
1H, ArH), 8.06 (s, 1H, ArH), 8.09 (d, J = 1.9 Hz, 1H,







ArH), 8.19 (d, J = 6.6 Hz, 1H, ArH), 8.30 (s, 1H, ArH),







8.58 (d, J = 3.3 Hz, 1H, ArH), 8.86 (d, J = 1.9 Hz, 1H,







NH), 9.91 (s, 1H, NH)


Example
white
34
186-200
m/e
1H NMR (300 MHz, CDCl3) d 2.50 (d, J = 8.7 Hz, 1H, ArH),


28
solid


379.10 [M + H]+
7.10 (d, J = 8.1 Hz, 1H, ArH), 7.15 (t, J = 2.4 Hz, 2H,







ArH), 7.60 (d, J = 6.6 Hz, 1H, ArH), 7.68 (s, 1H, NH),







7.89 (d, J = 2.7 Hz, 1H, ArH), 7.90 (d, J = 8.1 Hz, 1H,







ArH), 8.20 (d, J = 2.1 Hz, 1H, ArH), 8.27-8.34 (m, 2H),







ArH), 8.50 (s, 1H, NH)


Example
white
33
212-216
m/e
1H NMR (200 MHz, d6-DMSO) d 3.89 (s, 6H, CH3 × 2), 7.19 (m,


29
solid


391.1 [M]+, 361.2,
4H, ArH), 7.46 (d, J = 6.9 Hz, 1H, ArH), 7.81 (d, J = 8.9 Hz,






283.1
2H, ArH), 8.17 (m, 1H, ArH), 8.28 (s, 1H, ArH),







9.91 (s, 1H, NH), 11.74 (s, 1H, NH)









Comparative Example 1




SB-243213, a conventional 5-HT2c receptor antagonist, was prepared using methods in Bromidge, S. M.; Dabbs, S.; Davies, D. T.; Davies, S.; Duckworth, D. M.; Forbes, I. T.; Gaster, L. M.; Ham, P.; Jones, G. E.; King, F. D.; Mulholland, K. R.; Saunders, D. V.; Wyman, P. A.; Blaney, F. E.; Clarke, S. E.; Blackburn, Thomas P.; Holland, V.; Kennett, G. A.; Lightowler, S.; Middlemiss, D. N.; Trail, B.; Riley, G. J.; Wood, M. D. J. Med. Chem. 2000, 43, 1123.
State: white solid
mp: 212-214° C.
1H NMR (300 MHz, CDCl3) δ 2.43 (s, 3H, CH3), 2.45 (s, 3H, CH3), 3.28 (t, J=8.5 Hz, 2H, CH2), 4.13 (t, J=8.6 Hz, 2H, CH2), 6.37 (s, 1H, NH), 6.98 (d, J=8.8 Hz, 1H, ArH), 7.09 (s, 1H, ArH), 7.19 (m, 1H, ArH), 7.38 (dd, J=1.4, 8.1 Hz, 1H, ArH), 7.99 (d, J=2.9 Hz, 1H, ArH), 8.09 (dd, J=1.4, 8.8 Hz, 1H, ArH), 8.23 (s, 1H, ArH), 8.37 (dd, J=1.5, 4.8 Hz, 1H, ArH);
MS(EI) m/e 428[M]+, 413, 385.
Comparative Example 2




SB-247853, a conventional 5-HT2c receptor antagonist, was prepared using methods in Bromidge, S. M.; Davies, S.; Duckworth, D. M.; Forbes, I. T.; Jones, G. E.; Jones, J.; King, F. D.; Blackburn, T. P.; Holland, V.; Kennett, G. A.; Lightowler, S.; Middlemiss, D. N.; Riley, G. J.; Trail, B.; Wood, M. D. Bioorg. Med. Chem. Lett. 2000, 10, 1867.
State: white solid
mp: 220-222° C.
1H NMR (200 MHz, CDCl3) δ 2.42 (s, 3H, CH3), 3.28 (t, J=8.5 Hz, 2H, CH2), 4.13 (t, J=8.7 Hz, 2H, CH2), 5.5 (s, 2H, CH2), 6.27 (s, 1H, NH), 6.90 (d, J=8.5 Hz, 1H, ArH), 7.08 (s, 1H, ArH), 7.22 (m, 1H, ArH), 7.45 (d, J=7.7 Hz, 1H, ArH), 7.71 (m, 1H, ArH), 7.91 (dd, J=2.9, 9.0 Hz, 1H, ArH), 8.23 (s, 1H, ArH), 8.60 (m, 1H, ArH);
MS(EI) m/e 428[M]+, 411, 378.
Experimental Example 1
Experimental of Binding Affinity to the Serotonin 5-HT2c Receptor
In order to see the binding affinity of derivatives of the present invention to serotonin 5-HT2c receptors, the following experiment was performed.
As a receptor, a human gene recombinant 5-HT2c receptor expressed in CHO—K1 cell was purchased from Euroscreen, Belgium and used in the experiment, and as a radioactive isotope, [3H]mesulergine (Amersham Biosciences, UK).
A final volume of 0.25 ml reaction mixture was prepared by adding 50 mM Tris-HCl buffer (pH 7.7) containing one of the compounds in Examples 1-29 or Comparative Examples 1-2, 1 nM of [3H]mesulergine, 5-HT2c receptor membranes (4 D/well), 0.1% ascorbic acid and 10 M pargyline, and incubated at 37° C. for 30 minutes. After incubation, the reaction was terminated by the rapid filtration using an Inotech harvester (Inotech) through a Wallace GF/C glass fiber filter (Wallac, Finland) which was presoaked in 1% BSA, and then washed with ice-cold 50 mM Tris-HCl buffer. The filter was covered with MeltiLex, sealed in a sample bag followed by drying in the oven, and counted by MicroBeta Plus (Wallac). Non-specific binding was determined in the presence of 0.5 M Mianserin. Three repeating experiments were carried out with 7-8 concentrations of the compound in Examples 1-29 or the compound in comparative examples 1-2, run in duplicate tubes, and isotherms from the three assays were calculated by a nonlinear regression analysis (GraphPad Prism Program, San Diego, USA) to yield IC50 values. The lower the IC50 values are indicates that the affinity for the 5-HT2c receptors is higher.
The experimental results are summarized in Table 2.










TABLE 2







Division
IC50 (nM)



















Example 1
321



Example 2
572



Example 3
167



Example 4
50



Example 5
59



Example 6
67



Example 7
>10000



Example 8
302



Example 9
>10000



Example 10
23



Example 11
474



Example 12
9441



Example 13
6369



Example 14
4.5



Example 15
10.7



Example 16
1.9



Example 17
8.2



Example 18
0.6



Example 19
50



Example 20
5.9



Example 21
2253



Example 22
0.5



Example 23
106



Example 24
1.6



Example 25
542



Example 26
>1000



Example 27
214



Example 28
7



Example 29
>10000



Comparative Example 1
0.7



Comparative Example 2
1.3










As shown in Table 2, it was identified that compounds according to the present invention had IC50 values equivalent to or better than those of conventional 5-HT2c receptor inhibitors (Comparative Examples 1 and 2). In particular, the compounds in Example 18 and 22 have lower IC50 values than those in Comparative Examples. From these, compounds according to the present invention have high affinities for 5-HT2c receptors, relatively inhibit serotonin from binding to 5-HT2c receptors, and thus may prevent or treat diseases caused by serotonin which is excessively bound to the 5-HT2c receptors.
Experimental Example 2
Experiment of serotonin 5-HT2c Receptor Selectivity
In order to understand whether derivatives according to the present invention selectively bind to serotonin 5-HT2c receptors, the following experiment was performed.
For their high binding affinities for 5-HT2c, compounds in Examples 14 to 18, 20, and 22 or in Comparative Example 1 were used for the experiment with reaction mixtures. Except that CNS receptors such as 5-HT1a, 5-HT2a, 5-HT7, D2, D3 or D4 other than 5-HT2c were used as a receptor, IC50 values (nM) were measured in the same manner as in Experimental Example 1.
Results of measurements were shown in Table 3.















TABLE 3





Division
5-HT2c
5-HT1a
5-HT2a
5-HT6
5-HT7
D2
D3
D4























Example 14
4.5
>10000
>1000
>10000
>10000
>10000
>10000
>10000


Example 15
10.7
>10000
>10000
>10000
>10000
>10000
>10000
>10000


Example 16
1.9
>10000
>10000
>10000
>10000
>10000
>10000
>10000


Example 17
8.2
>10000
>10000
>10000
>10000
>10000
>10000
>10000


Example 18
0.62
780
84.7
>1000
>1000
>10000
>1000
>1000


Example 20
5.9
>10000
>10000
>1000
>10000
>10000
>10000
>10000


Example 22
0.5
>10000
>1000
>10000
>10000
>10000
>10000
>1000


Comparative
0.7
>1000
32.4
667
>1000
>1000
>1000
>10000


Example 1









AS shown in Table 3, derivatives according to the present invention have high affinities as the IC50 values for 5-HT2c are 0.5 to 10.7 nM, while values for other receptors (5-HT1a, 5-HT2a, 5-HT6, 5-HT7, D2, D3, and D4) are more than 1000 meaning that they are rarely bound to the receptors. Thus, derivatives according to the present invention selectively bind to 5-HT2c receptors, rarely have adverse effects caused by binding to other receptors, and may prevent or treat diseases caused by serotonin which is excessively bound to the 5-HT2c receptors.
Experimental Example 3
In vitro Functional Experiment
In order to identify whether derivatives according to the present invention have antagonist activities for G proteins binding to 5-HT2c receptors, the following experiment was performed.
The experiment was carried out by known methods in Sim, L. et al, Proc. Natl. Acad. Sci. USA, 1995, 92, 7242, using DSPS (MDS Pharma Services PT#1102941), and [35S]GTPS activities in CHO cells in which human 5-HT2c receptors are transformed were measured.
Specifically, human CHO cells were suspended in 0.4% DMSO, and then the compound in Example 22 at various concentrations of 0.001, 0.01, 0.1, 1, and 10 M and the suspension were added to an incubation buffer containing 20 mM HEPES (pH 7.4), 100 mM NaCl, 10 mM MgCl2, and 1 mM EDTA, and incubated at 30° C. for 45 minutes. After incubation, inhibition rate of serotonin (5-HT)-induced [35S]GTPS increase was calculated by measuring concentrations of bound [35S]GTPS. From the results, compounds having more than 50% inhibition rate of serotonin (5-HT)-induced [35S]GTPS increase were classified as antagonists. SB242084, a 5-HT2c antagonist, was used as a control group. Results are summarized in FIG. 1 and Table 4.
<Table 4, Inhibition Rate of Serotonin (5-HT)-Induced [35S]GTPS of Compounds in Example 22>










TABLE 4







Concentration (M)
Inhibition rate (%)



















0.001
0



0.01
1



0.1
9



1
67



10
100










As shown in FIG. 1 and Table 4, human 5-HT2c receptors exhibited a 5-HT concentration-dependent increase in [35S]GTPS concentration levels with EC50=0.02 M, and the increase in [35S]GTPS concentration level was inhibited by SB242084, a 5-HT2c antagonist in Example 22. In particular, compounds in Example 22 according to the present invention inhibit 0, 1, 9, 67, and 100% in 30 M serotonin (5-HT)-induced GTP level increase at 0.001, 0.01, 0.1, 1, and 10 M, respectively, and showed a significant antagonist activity with IC50=0.59 μM.
Thus, derivatives according to the present invention show a significant antagonist activity on human 5-HT2c receptors and may prevent or treat diseases caused by serotonin which is excessively bound to 5-HT2c receptors.
Piperidine derivatives represented by Formula (1) 1 according to the present invention may be formulated in various forms according to the intended purpose. Formulations containing the compounds represented by Formula (1) according to the present invention as an active ingredient are illustrated in the following examples, but are not construed to limit the scope of the invention.
Formulation Example 1
Pharmaceutical Formulations
<1-1> Tablet (Direct Compression)
After being sieved, 5.0 mg of a piperidine compound of Formula (1) was mixed with 14.1 mg of lactose, 0.8 mg of Crospovidone USNF, and 0.1 mg of magnesium stearate, and compressed into tablets.
<1-2> Tablet (Wetting Formulation)
After being sieved, 5.0 mg of a piperidine compound of Formula (1) was mixed with 16.0 mg of lactose and 4.0 mg of starch. To the resulting mixture, solution of 0.3 mg of polysolvate 80 in purified water was added, followed by granulation. Next, the resulting granules were dried, sieved, mixed with 2.7 mg of colloidal silicon dioxide and 2.0 mg of magnesium stearate, and compressed into tablets.
<1-3> Powder and Capsule
5.0 mg of an active ingredient was sieved and mixed with 14.8 mg of lactose, 10.0 mg of polyvinyl pyrrolidone, and 0.2 mg of magnesium stearate. The mixture was filled in a hard gelatine capsule No. 5, using a suitable apparatus.
<1-4> Injection Solution
An injection was prepared by mixing 100 mg of an active ingredient, 180 mg of mannitol, 26 mg of Na2HPO4-12H2O and 2974 mg of distilled water.
Formulation Example 2
Preparation of Food
<2-1> Preparation of Flour Food
Food for health improvement was prepared by adding the compound of Formula (1) according to the present invention by 0.5 to 5 weight % to wheat flour, and then making bread, cakes, cookies, crackers and noodles using the mixture.
<2-2> Preparation of Dairy Products
Various dairy products such as butter and ice cream were prepared by adding the compound of Formula (1) according to the present invention by 5 to 10 weight % to milk and using the mixture.
<2-3> Preparation of Sunsik (Grain Powder)
Brown rice, barley, glutinous rice and coix (job's tear) were gelatinizated by the conventional method, followed by drying. The dried mixture was distributed and pulverized, resulting in 60-mesh size grain powders. Black bean, black sesame and perilla were steamed and dried by the conventional method. The dried mixture was distributed and pulverized, resulting in 60-mesh size grain powders. The compound of Formula (1) according to the present invention was vacuum-concentrated under reduced pressure using a vacuum concentrator, which was then spray-dried with a hot-air drier. The dried material was pulverized by a grinder, resulting in 60-mesh size grain powders. The prepared grain, seeds, and compound of Formula (1) according to the present invention were all mixed at the following ratio.
Grain (brown rice 30 weight %, coix 15 weight %, barley 20 weight %),
Seeds (perilla 7 weight %, black bean 8 weight %, black sesame 7 weight %),
Compound of Formula (1) (3 weight %),
Ganoderma lucidum (0.5 weight %),
Rehmannia glutinosa (0.5 weight %).
Manufacturing Example 3
Preparation of Beverages
<3-1> Preparation of Carbonated Beverages
Sugar (5 to 10%), citric acid (0.05 to 0.3%), caramel (0.005 to 0.02%), vitamin C (0.1 to 1%), and the compound of Formula (1) (1 to 5%) were mixed, to which purified water (79 ̃94%) was added to make syrup. The prepared syrup was sterilized at 85 to 98° C. for 20 to 180 seconds, and mixed with cooling water at the ratio of 1:4. And then, carbon dioxide gas (0.5 to 0.82%) was given to the mixture to prepare carbonated beverages containing the compound of Formula (1) of the present invention.
<3-2> Preparation of Health Beverages
Liquid fruit sugar (0.5%), oligosaccharide (2%), sugar (2%), salt (0.5%) and water (75%) were all mixed with the compound of Formula (1) evenly, followed by sterilization. The mixture was put in a small container such as a glass bottle or PET bottle, resulting in health beverages.
<3-3> Preparation of Vegetable Juice
5 g of the compound of Formula (1) of the present invention was added to 1 l of tomato or carrot juice to prepare health vegetable juice.
<3-4> Preparation of Fruit Juice
1 g of the compound of Formula (1) of the present invention was added to 1 l of apple or grape juice to produce health fruit juice.
The present invention may be useful in new indole carboxylic acid bispyridyl carboxamide derivatives, preparation methods thereof, and preparation of compositions for prevention or treatment of obesity, urinary disorders, and CNS disorders, containing the same as an active ingredient. The present invention may be also useful in treatment or prevention of obesity; urinary disorders such as urinary incontinence, premature ejaculation, erectile dysfunction, and prostatic hyperplasia; CNS disorders such as depression, anxiety, concern, panic disorder, epilepsy, obsessive-compulsive disorder, migraine, sleep disorder, withdrawal from drug abuse, Alzheimer's disease, and schizophrenia, associated with 5-HT2c receptors.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
INDUSTRIAL APPLICABILITY
As apparent from the above description, the present invention provides a new indole carboxylic acid bispyridyl carboxamide derivative, a preparation method thereof, and a composition for prevention or treatment of obesity, urinary disorders, and CNS disorders. Due to having high affinity for 5-HT2c receptors and selectivity on the 5-HT2c receptors, the indole carboxylic acid bispyridyl carboxamide derivatives according to the present invention are therapeutically effective for obesity; urinary disorders such as urinary incontinence, premature ejaculation, erectile dysfunction, and prostatic hyperplasia; CNS disorders such as depression, anxiety, concern, panic disorder, epilepsy, obsessive-compulsive disorder, migraine, sleep disorder, withdrawal from drug abuse, Alzheimer's disease, and schizophrenia, associated with 5-HT2c receptors.

## Claims

1. A compound represented by Formula (I), and pharmaceutically acceptable salts thereof:



wherein,
R1 is




A is N,
R6 is




R2 is H or a C1 to C5 linear or branched alkyl group,
R3 to R5 are independently or selectively H, a C1 to C5 alkyl group, a C1 to C5 alkoxy group, or halogen,
X is CH2, C═O, C═S, or SO2,
Y is O, S, NH, or N—CH3,
Z is C or N, and
n is 1.

2. An indole compound selected from the group consisting of:
(1) benzofuran-3-sulfonic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
(2) benzo[b]thiophene-3-sulfonic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
(3) benzofuran-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
(4) benzo[b]thiophene-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
(5) 1H-indole-2-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
(6) 1H-indole-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
(7) 1H-benzoimidazole-2-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
(9) (1H-indole-3-ylmethyl)-[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amine;
(10) 1H-indole-3-carbothioic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
(11) 1-methyl-1H-indole-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
(12) 1H-indole-3-carboxylic acid methyl-[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
(13) 1-methyl-1H-indole-3-carboxylic acid methyl-[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
(14) 5-methyl-1H-indole-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
(15) 5-methoxy-1H-indole-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
(16) 6-methyl-1H-indole-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
(17) 7-methyl-1H-indole-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
(18) 5-iodo-1H-indole-3-carboxylic acid[6-(2-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
(19) 1H-indole-3-carboxylic acid[6-(pyrimidine-5-yloxy)-pyridine-3-yl]-amide;
(20) 1H-indole-3-carboxylic acid[6-(pyridine-2-ylmethoxy)-pyridine-3-yl]-amide;
(21) 1H-indole-3-carboxylic acid [6-(6-methyl-pyridine-3-yloxy)-pyridine-3-yl]-amide;
(22) 1H-indole-3-carboxylic acid [6-(2-chloro-pyridine-3-yloxy)-pyridine-3-yl]-amide;
(23) 1H-indole-3-carboxylic acid [6-(2-bromo-pyridine-3-yloxy)-pyridine-3-yl]-amide;
(24) 1H-indole-3-carboxylic acid [6-(pyridine-3-yloxy)-pyridine-3-yl]-amide;
(25) 1H-indole-3-carboxylic acid (6-phenoxy-pyridine-3-yl)-amide; and
(28) 6-methyl-1H-indole-3-carboxylic acid [6-(2-chloro-pyridine-3-yloxy)-pyridine-3-yl]-amide.

3. A method for preparing the compound of claim 1, wherein R2 is H as represented by Chemistry FIG. 1a, comprising:
reacting a substituted heteroaryl derivative of Chemistry FIG. 2 with an amine compound of Chemistry FIG. 3 to prepare a compound of Chemistry FIG. 1, as described in Reaction Formula 1:




wherein R1 to R5, n, X, Y, and Z are as defined in Chemistry FIG. 1 of claim 1, and L is a leaving group.

4. The method according to claim 3, wherein, when the heteroaryl derivative (2) is a heteroaryl carboxylic acid derivative, the reaction is carried out in a reaction solvent in the presence of a condensing agent and a base at room temperature to the boiling temperature of the solvent.

5. The method according to claim 4, wherein the reaction solvent is one selected from the group consisting of tetrahydrofuran (THF), 1,4-dioxane, benzene, toluene, dichloromethane (DCM), chloroform, acetonitrile, and dimethylformamide (DMF), or a mixed solvent thereof.

6. The method according to claim 4, wherein the condensing agent is selected from the group consisting of N,N-carbonyldiimidazole (CDI), dicyclohexylcarbodiimide (DCC), diisopropylcarbodiimide (DIPC), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC), and O-(benzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (HBTU).

7. The method according to claim 4, wherein the base is selected from the group consisting of pyridine, diisopropylethylamine, triethylamine, and 1,8-diazabicyclo-[5.4.0]undec-7-ene (DBU).

8. The method according to claim 3, wherein, when the heteroaryl derivative (2) is a heteroarylsulfonyl derivative, the reaction is carried out in a reaction solvent in the presence of a base at room temperature.

9. The method according to claim 8, wherein the reaction solvent is one selected from the group consisting of tetrahydrofuran (THF), 1,4-dioxane, benzene, toluene, dichloromethane (DCM), chloroform, acetonitrile, and dimethylformamide (DMF), or a mixed solvent thereof.

10. The method according to claim 8, wherein the base is selected from the group consisting of pyridine, diisopropylethylamine, triethylamine, and 1,8-diazabicyclo-[5.4.0]undec-7-ene (DBU).

11. The method according to claim 3, further comprising introducing an alkyl group (R2) into the amine, as described in Reaction Formula 4: