Pyridylisoxazole Derivatives

TECHNICAL FIELD

This invention relates to novel pyridylisoxazole derivatives or salts thereof, methods of their preparation and their use. Compounds of this invention exhibit p38MAPkinase inhibiting action and in consequence inhibitory action to the production of tumor necrosis factor-α (TNF-α), interleukin-1 (IL-1), interleukin-6 (IL-6), interleukin-8 (IL-8), cyclooxygenase-II (COX-II) and the like. They are, therefore, useful as the treating agent of TNF-α-related diseases, IL-1-related diseases, IL-6-related diseases, IL-8-related diseases and COX-II-related diseases and the like.

BACKGROUND ART

TNF-α, IL-1, IL-6, IL-8 and COX-II are mainly the proteins (cytokines) produced by immunocompetent cells such as macrophage and neutrophil, which are known as one of the important factors participating in, besides immunomodulatory function and inflammatory symptoms, the hematopoietic system, endocrine system, nervous system and the like.

On the other hand, p38MAPkinase has the action of activating transcription factors such as NF-κB, AP-1 and CREB. These transcription factors bind to the DNA sequence common among TNF-α, IL-1, IL-6, IL-8, COX-II and the like to promote transcription of mRNA which synthesizes the respective cytokines. p38MAPkinase, therefore, has the action to promote the production of cytokines such as TNF-α. While the transcribed mRNA is inactivated upon binding to specific protein and then quickly degraded, p38MAPkinase has an action to dissociate the bonds between mRNA and the specific proteins. In this respect also p38MAPkinase is deemed to contribute to the production of cytokines such as TNF-α.

Accordingly, inhibition of p38MAPkinase leads to inhibition of the production of cytokines such as TNF-α and, therefore, is expected to be useful for the treatment or prophylaxis of the diseases related to the cytokines such as TNF-α, for example, acute inflammation, chronic inflammation, rheumatoid arthritis, osteoarthritis, gout, inflammatory bowel disease, Crohn's disease, ulcerative colitis, gastritis, colonic polyposis, large bowel cancer, colon cancer, asthma, bronchitis, bronchial asthma, allergic rhinitis, ARDS, chronic obstructive pulmonary disease, pulmonary fibrosis, congestive heart disease, ischemic heart disease, myocardial infarction, arteriosclerosis, hypertension, angina, Alzheimer's disease, reperfusion injury, angiitis, cerebrovascular disease, meningitis, multiple sclerosis, osteoporosis, bony sclerosis, Behcet's Syndrome, bone metastasis, multiple myeloma, acute infectious disease, septic shock, sepsis, toxic-shock syndrome, tuberculosis, DIC, psoriasis, atopic dermatitis, cirrhosis, renal fibrosis, cachexia, AIDS, cancer, autoimmune disease, diabetes, Castleman's disease, mesangial nephritis, endometriosis and preterm delivery.

In the past, as the compounds having p38MAPkinase-inhibiting action, for example, imidazole derivatives (cf. Bioorganic & Medicinal Chemistry, Vol. 5, No. 1, 49-64 (1997) and JP Tokuhyo Hei 7 (1995)-503017), pyrazole derivatives (cf. PCT International Publications WO98/52940 Pamphlet and WO00/39116 Pamphlet) and isoxazole derivatives (cf. JP Tokuhyo Hei 11 (1999)-503722, JP2002-179656A, PCT International Publication WO2004/17968 Pamphlet, JP 2000-86657A and PCT International Publication WO2004/22555 Pamphlet) have been proposed. However, these compounds are subject to such problems that most of them exhibit side effects and have not matured as marketable medicines.

Only recently certain kind of triazine derivatives were found to possess potent p38MAPkinase-inhibiting action and high speed metabolism, and hence were expected to show reduced side effects and to be prospective antirheumatic medicine (cf. J. Med. Chem., Vol. 47, 6283-6291 (2004)).

DISCLOSURE OF THE INVENTION

An object of the present invention is to provide pyridyl-isoxazole derivatives which exhibit excellent p38MAPkinase-inhibiting activity and reduced side effects.

We have now discovered that a certain kind of novel 4-(4-pyridyl)isoxazole derivatives possess excellent p38MAPkinase-inhibiting activity and high expiration rate of metabolically active substance in blood, and hence have the potential to reduce the side effects which have been the drawback in past p38MAPkinase-inhibitors, and completed the present invention.

Thus, according to the invention, pyridylisoxazole derivatives which are represented by a formula (I)

in the formula,

R¹and R²each independently stands for hydrogen, halogen, lower alkyl, lower alkoxy, amino, lower alkylamino, di-lower alkyl-amino, phenyl-lower alkylamino, acylamino, lower alkylthio or lower alkylsulfinyl,

R³stands for naphthyl, optionally lower alkyl-substituted heteroaryl or a group represented by the following formula (A)

wherein X¹, X²and X³each independently stands for hydrogen, halogen, lower alkyl, lower haloalkyl, lower alkoxy, lower haloalkoxy, hydroxyl, lower alkanoyl, lower haloalkanoyl or phenyl; or X¹and X²together stand for lower alkylenedioxy group,

R⁴stands for hydrogen or lower alkyl,

R⁵stands for phenyl, thienyl, furyl, pyrrolyl, imidazolyl, pyrazolyl, thiazolyl, isothiazolyl, oxazolyl or isoxazolyl, which may be optionally substituted with 1-3 substituents selected from halogen, lower alkyl, lower haloalkyl, lower alkoxy, hydroxyl, lower alkanoyl, lower haloalkanoyl, lower alkylthiocarbonyl, lower haloalkylthio-carbonyl, amino, lower alkylamino, di-lower alkylamino and nitro,

Y stands for —(CH₂)_n—, —CO—, —CH(CH₃)—, —C(CH₃)₂—, —O—, —NH— or

wherein n is an integer of 1-3, with the proviso that, where both of R¹and R²stand for hydrogen and R³stands for the group of the formula (A) and two of X¹, X²and X³stand for hydrogen, the remaining one of X¹, X²and X³is a group other than hydrogen atom or halogen atom,

or pharmaceutically acceptable salts thereof are provided.

The invention also provides p38MAPkinase inhibitors characterized by containing pyridylisoxazole derivatives of the formula (I) or pharmaceutically acceptable salts thereof.

In the present specification, the term, “lower” signifies that a group modified by this term contains no more than 6, preferably no more than 4, carbon atoms.

“Lower alkyl” can be of straight chain or branched chain, examples of which include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n-pentyl and n-hexyl; methyl, ethyl, n-propyl, isopropyl and n-butyl being preferred among these. “Lower alkoxy” includes oxy (O) group bound to the lower alkyl, such as, for example, methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutyloxy, sec-butyloxy, n-pentyloxy and n-hexyloxy; methoxy, ethoxy, n-propoxy, isopropoxy and n-butoxy being preferred among these. “Lower alkanoyl” includes carbonyl (C═O) group bound to the lower alkyl, such as acetyl, propionyl, butyryl, isobutyryl, valeryl, isovaleryl and pivaloyl; acetyl and propionyl being preferred among these.

Furthermore, “halogen” and “halo” include fluorine, chlorine, bromine and iodine; fluorine, chlorine and bromine being particularly preferred.

“Lower alkylamino” in the definition of R¹signifies amino group (—NH₂) of which one of the hydrogen atoms is substituted with the lower alkyl; and “di-lower alkylamino”, amino group of which two hydrogen atoms are substituted with the lower alkyl. Here the two lower alkyl groups in such di-lower alkylamino may be the same or different. “Phenyl-lower alkylamino” in the definition of R¹is such a lower alkylamino of which lower alkyl moiety is substituted with phenyl, examples of which include benzylamino, 2-phenylethylamino, 3-phenyl-n-propylamino, 4-phenyl-n-butylamino, 1-phenylethylamino and 1-(phenylmethyl)ethylamino; benzylamino and 2-phenylethyl-amino being preferred among these.

“Acylamino” in the definition of R¹signifies acylated amino, examples of the acyl group including lower alkanoyl groups such as formyl, acetyl, propionyl and butyryl, and aroyl groups such as benzoyl; acetyl and benzoyl being preferred among these.

“Lower alkylthio” and “lower alkylsulfinyl” in the definition of R¹respectively mean thio (S) group and sulfinyl (SO) group, to which the lower alkyl is bound.

“Optionally lower alkyl-substituted heteroaryl” in the definition of R³signifies unsubstituted or the lower alkyl-substituted monocyclic or polycyclic heteroaryl groups, wherein the heteroaryl groups include 5- to 10-membered aromatic groups having in the ring 1-3 hetero atoms selected from N, O and S, specific examples of which include furyl, pyrrolyl, thienyl, imidazolyl, pyrazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl, indolyl, benzoimidazolyl, benzoxazolyl, benzoisoxazolyl, benzothiazolyl, benzoisothiazolyl, quinolyl, isoquinolyl and quinazolyl; furyl, pyrrolyl, thienyl and pyridyl being preferred among these.

In the groups represented by the following formula

in the definition of R³, X¹, X²and X³may substitute at any of the different positions on the benzene ring, and their binding sites are subject to no particular limitation.

“Lower haloalkyl” in the definition of X¹, X²and X³in the above formula (A) includes lower alkyl groups as earlier defined, which are substituted with one or more same or different halogen atoms, examples of which include fluoromethyl, trifluoromethyl, 1,2-dichloroethyl, 1-chloro-2-bromoethyl, pentafluoroethyl, 1-chloro-n-propyl, 2-bromo-2-methylethyl, 3-chloro-n-pentyl, 2-bromo-3-chloro-n-hexyl and the like. Of these, C_1-2lower alkyl substituted with 1-5 same or different halogen atoms are preferred.

“Lower haloalkoxy” in the definition of X¹, X²and X³in the above formula (A) includes oxy (O) group to which above lower haloalkyl is bound. In particular, C_1-2lower haloalkoxy groups substituted with 1-5 same or different halogen atoms are preferred.

“Lower haloalkanoyl” in the definition of X¹, X²and X³in the formula (A) includes aforesaid lower alkanoyl groups which are substituted with 1 or more halogen atoms, examples of which include fluoroacetyl, chloroacetyl, bromoacetyl, trifluoroacetyl, 3-fluoropropionyl, 3-chloropropionyl, 3-bromopropionyl, 4-chlorobutyryl and the like. Of these, fluoroacetyl, trifluoroacetyl, 3-fluoropropionyl and 3-chloropropionyl are preferred.

As examples of “lower alkylenedioxy” in the definition of X¹, X²and X³in the formula (A), methylenedioxy, ethylenedioxy, trimethylenedioxy and the like can be named, among which methylenedioxy and ethylenedioxy are preferred.

As examples of “lower haloalkyl”, “lower alkanoyl” and “lower haloalkanoyl” in the definition of R⁵, respectively those groups named as for “lower haloalkyl” “lower alkanoyl” and “lower haloalkanoyl” in the definition of X¹, X²and X³in the formula (A) can be named, among which the preferred groups also are the same.

“Lower alkylthiocarbonyl” in the definition of R⁵signifies thiocarbonyl (C═S) to which aforesaid lower alkyl is bound, examples of which include thioacetyl, thiopropionyl, thiobutyryl, thiopentanoyl, thiohexanoyl and the like, thioacetyl and thiopropionyl being preferred among these.

“Lower haloalkylthiocarbonyl” in the definition of R⁵signifies above lower alkylthiocarbonyl which is substituted with 1 or more halogen atoms, examples of which include fluorothioacetyl, chlorothioacetyl, bromothioacetyl, trifluorothioacetyl, chlorothio-propionyl, chlorothiobutyryl, bromothiopentanoyl, fluorothiohexanoyl and the like, fluorothioacetyl, chlorothioacetyl, bromothioacetyl and trifluorothioacetyl being preferred among these.

Where both R¹and R²in the formula (I) are hydrogen, R³stands for the group of formula (A) and two of X¹, X²and X³stand for hydrogen, the compounds in which the remaining one of X¹, X²and X³stands for hydrogen or halogen are disclosed in JP 2000-86657A and hence are excluded from the compounds of the formula (I) of the present invention.

A preferred group of compounds in the present invention are those of the formula (I) in which R¹and R²each independently stands for hydrogen, amino, lower alkylamino or di-lower alkylamino, in particular, those of the formula (I) in which both R¹and R²stand for hydrogen. When either one of R¹and R²stands for hydrogen and the other stands for a group other than hydrogen, that group preferably is substituted at 2-position of the pyrimidine ring.

Another preferred group of compounds in the present invention are those of the formula (I) in which R²stands for a group represented by the following formula

in particular, those in which X¹, X²and X³each independently stands for hydrogen, halogen, lower alkyl or lower alkoxy.

Still another preferred group of compounds in the present invention are those of the formula (I) in which R⁴stands for hydrogen.

A further preferred group of compounds in the present invention are those of the formula (I) in which R⁵stands for phenyl which is optionally substituted with 1-3 substituents selected from halogen, lower alkyl, lower haloalkyl, lower alkoxy, hydroxyl, lower alkanoyl, lower haloalkanoyl, lower alkylthiocarbonyl, lower haloalkylthiocarbonyl, amino, lower alkylamino, di-lower alkylamino and nitro. In particular, those compounds of the formula (I) in which R⁵stands for phenyl which is optionally substituted with 1 or 2 substituents selected from halogen and lower alkyl are better preferred, inter alia, the compounds of the formula (I) in which R⁵is phenyl, 2-halophenyl, 2,6-dihalophenyl, 2-lower alkylphenyl, 3-lower alkylphenyl or 2,5-di-lower alkylphenyl are best preferred.

Another preferred group of compounds in the present invention are the compounds of the formula (I) in which Y stands for —CH₂— or —(CH₂)₂—.

Particularly preferred compounds according to the invention are as follows:

3-(3-methylphenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)-isoxazole,
3-(3-methylphenyl)-5-[(2-methylphenyl)propionylamino]-4-(4-pyridyl)isoxazole,
5-[(3-chlorophenyl)propionylamino]-3-(2-fluoro-5-methylphenyl)-4-(4-pyridyl)isoxazole,
3-(4-fluoro-3-methylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole,
5-[(2-chlorophenyl)acetylamino]-3-(4-fluoro-3-methylphenyl)-4-(4-pyridyl)isoxazole, and
3-(4-fluoro-3-methylphenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)isoxazole.

Also as the typical examples of the compounds of the formula (I) offered by the present invention, the following can be named other than those given in the later appearing Examples:

3-(4-fluorophenyl)-4-[4-(2-methylaminopyridyl)]-5-phenylacetylaminoisoxazole,
3-(4-fluorophenyl)-4-[4-(2-methylaminopyridyl)]-5-(3-phenylpropionylamino)isoxazole,
4-[4-(2-benzylaminopyridyl)]-3-(4-fluorophenyl)-5-phenyl-acetylaminoisoxazole,
4-[4-(2-benzylaminopyridyl)]-3-(4-fluorophenyl)-5-(3-phenyl-propionylamino)isoxazole,
4-[4-(2-acetylaminopyridyl)]-3-(4-fluorophenyl)-5-phenyl-acetylaminoisoxazole,
4-[4-(2-acetylaminopyridyl)]-3-(4-fluorophenyl)-5-(3-phenyl-propionylamino)isoxazole,
4-[4-(2-benzoylaminopyridyl)]-3-(4-fluorophenyl)-5-phenyl-acetylaminoisoxazole,
4-[4-(2-benzoylaminopyridyl)]-3-(4-fluorophenyl)-5-(3-phenyl-propionylamino)isoxazole,
3-(4-fluoro-3-methylphenyl)-5-(N-methyl-phenylacetylamino)-4-(4-pyridyl)isoxazole,
3-(4-fluoro-3-methylphenyl)-5-[N-methyl-(3-phenylpropionyl)-amino]-4-(4-pyridyl)isoxazole,
5-[(2-aminophenyl)acetylamino]-3-(4-fluoro-3-methylphenyl)-4-(4-pyridyl)isoxazole,
3-(4-fluoro-3-methylphenyl)-5-[(2-hydroxyphenyl)-acetylamino]-4-(4-pyridyl)isoxazole,
3,4-di(4-pyridyl)-5-phenylacetylaminoisoxazole,
3,4-di(4-pyridyl)-5-(3-phenylpropionylamino)isoxazole,
3-[4-(2-methylpyridyl)]-5-phenylacetylamino-4-(4-pyridyl)-isoxazole,
3-[4-(2-methylpyridyl)]-5-(3-phenylpropionylamino)-4-(4-pyridyl)isoxazole, and the like.

The compounds of the formula (I) of the present invention can also be present in the form of salt. As examples of the salts, those with inorganic acids such as hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid and the like; and those with organic acids such as acetic acid, oxalic acid, citric acid, lactic acid, tartaric acid, p-toluenesulfonic acid and the like can be name. Of these, pharmaceutically acceptable salts are preferred.

The compounds of the formula (I) according to the invention can be prepared, for example, by the following method (a) or (b).

Method (a):

A compound of the formula (I) in which R⁴stands for hydrogen, i.e., a compound of the following formula,

- in the formula, R¹, R², R³, R⁵and Y have the previously given significations,
  
  can be prepared by reaction of a compound represented by the following formula,

- in the formula, R¹, R²and R³have the previously given significations,
  
  with a carboxylic acid compound of the following formula,

- in the formula, R⁵and Y have the previously given significations,
  
  or its reactive derivative (for example, acid halide, acid anhydride, mixed acid anhydride, active amide, active ester or the like).

Method (b):

A compound of the formula (I) in which R⁴stands for a lower alkyl, i.e., a compound represented by the following formula,

- in the formula, R¹, R², R³, R⁵and Y have the previously given significations, and R stands for a lower alkyl,
  
  can be prepared by N-lower alkylation of a compound of the formula (I-1).

In the method (a), it is desirable that the carboxylic acid compound of the formula (III) is advancedly treated with, for example, 1,1-carbonyldiimidazole (CDI), 1,1-thionyldiimidazole or the like, to be converted to a reactive derivative thereof such as active amide. It is also possible when acid halide, for example, acid chloride, is used as the reactive derivative of the carboxylic acid compound of the formula (III), to treat the acid halide in advance with, for example, imidazole and DBU or the like to convert it to other reactive derivative such as imidazolide.

Furthermore, when R¹in the compounds of the formula (II) represents amino, lower alkylamino or phenyl-loweralkylamino, it is advantageous to protect the amino, lower alkylamino or phenyl-lower alkylamino in advance with a suitable protective group, for example, with the use of di-tert-butyl dicarbonate (BOC), acetonyl acetone, benzyloxycarbonyl chloride (Z-chloride) or the like where necessary, removing the protective group after termination of the reaction.

The reaction of a compound of the formula (II) with a carboxylic acid compound of the formula (III) or a reactive derivative thereof can generally be conducted in inert organic solvent, for example, ethers such as dioxane, tetrahydrofuran and dimethoxyethane; aromatic hydrocarbons such as benzene, toluene and xylene; halogenated hydrocarbons such as dichloromethane and chloroform; amides such as dimethylformamide and dimethyl-acetamide; dimethylsulfoxide; and, where necessary, in the presence of a base, for example, 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), triethylamine, diisopropylethylamine, pyridine or the like. The suitable reaction temperature is normally within a range of 0° C. to the reflux temperature of the reaction mixture, preferably from the temperature under cooling with ice up to 50° C.

The carboxylic acid compound of the formula (III) or reactive derivative thereof can be generally used in an amount of at least 1 mol, preferably 1.5-10 mols, inter alia, 2-5 mols, per mol of the compound of the formula (II). Also the use rate of the base is generally at least 1 mol, preferably 1-2 mols, per mol of the carboxylic acid compound of the formula (III) or reactive derivative thereof.

Compounds of the formula (II) which are used as the starting material can be readily synthesized by those synthesis methods known per se, for example, following the route indicated by the following reaction scheme 1. Concerning the particulars of the reaction conditions and the like of the reaction scheme 1, refer to Example 1, a) given later.

in which R¹, R²and R³have the previously given significations, and X stands for halogen.

The N-lower alkylation of the compounds of the formula (I-1) according to the method (b) can generally be carried out by reacting the compounds with lower alkyl halide, for example, iodomethane, ethyl bromide, propyl bromide and the like, in inert organic solvent, for example, alcohols such as methanol, ethanol and isopropanol; ethers such as dioxane, tetrahydrofuran and dimethoxyethane; aromatic hydrocarbons such as benzene, toluene and xylene; amides such as dimethylformamide and dimethylacetamide; and dimethylsulfoxide; and in the presence of a suitable base such as sodium hydride, potassium carbonate, pyridine and the like. The suitable reaction temperature is normally within a range of 0° C. to the reflux temperature of the reaction mixture, preferably from room temperature to 50° C.

The lower alkyl halide can be used generally in an amount of at least 1 mol, preferably 1.1-5 mols, inter alia, 1.2-4 mols, per mol of a compound of the formula (I-1). The use rate of the base is generally at least 1 mol, preferably within a range of 1-5 mols, per mol of a compound of the formula (I-1).

Those compounds of the formula (I) of the present invention which are prepared following the above-described methods can be isolated and purified by the means known Per se, for example, recrystallization, column chromatography, thin-layer chromatography and the like.

The pyridylisoxazole derivatives represented by the formula (I) of the present invention or their pharmaceutically acceptable salts possess excellent p38MAPkinase-inhibiting action with reduced side effects, and are useful for the treatment or prophylaxis of human and other mammals' TNF-α-, IL-1-, IL-6-, IL-8- and COX-II-related diseases, for example, acute inflammation, chronic inflammation, rheumatoid arthritis, osteoarthritis, gout, inflammatory bowel disease, Crohn's disease, ulcerative colitis, gastritis, colonic polyposis, large bowel cancer, colon cancer, asthma, bronchitis, bronchial asthma, allergic rhinitis, ARDS, chronic obstructive pulmonary disease, pulmonary fibrosis, congestive heart disease, ischemic heart disease, myocardial infarction, arteriosclerosis, hypertension, angina, Alzheimer's disease, reperfusion injury, angiitis, cerebrovascular disease, meningitis, multiple sclerosis, osteoporosis, bony sclerosis, Behcet's Syndrome, bone metastasis, multiple myeloma, acute infectious disease, septic shock, sepsis, toxic-shock syndrome, tuberculosis, DIC, psoriasis, atopic dermatitis, cirrhosis, renal fibrosis, cachexia, AIDS, cancer, autoimmune disease, diabetes, Castleman's disease, mesangial nephritis, endometriosis and preterm delivery.

The TNF-α production inhibitory action based on the p38MAPkinase-inhibiting action possessed by the compounds of the formula (I) of the present invention and metabolic expiration rate in blood of the compounds of the formula (I) of the present invention can be demonstrated by the following experiments.

(1) Measurement of TNF-α Production-Inhibiting Action

THP-1, human-derived culture cells (purchased from Dainippon Pharmaceutical Co.), was suspended (1×10⁵cells/mL) in RPMI 1640 medium (10% fetal bovine serum, containing 100 units/mL of penicillin). The THP-1 cell suspension 1.6 mL was inoculated in a 24-well culture plate, to which further a solution of test substance as dissolved in RPMI 1640 medium to make the final concentration of the test substance 100 nM and 0.2 mL of LPS (E. coli 055: B5-derived, dissolved in RPMI 1640 medium, Difco) of 10 μg/mL in concentration were added, followed by 2 hours' culture under the conditions of 37° C. and 5% CO₂. The supernatant which was obtained upon centrifuge (500×g, 5 minutes) was measured with ELISA (Amersham Biosciences, TNF-α Human, ELISA Biotrak System) to quantize TNF-α. The TNF-α production inhibition rate (%) at 100 nM of each test substance was calculated according to the following formula,

$[1 - \frac{quantity of TNF - α when each test substance was used}{quantity of TNF - α in control experiment}] \times 100$

The results are shown in the later-appearing Table A.

(2) Measurement of the Compounds' Metabolic Rate:

Each test compound was added to potassium phosphate buffer (50 mmol/L, pH7.4) containing NADPH generating system (comprising 3.3 mmol/L MgCl₂, 3.3 mmol/L glucose 6-phosphate, 1.3 mmol/L β-NADP⁺ and 0.4 unit/mL glucose 6-phosphate dehydrogenase) (in which occasion the final concentration was rendered 1 μmol/L) and incubated at 37° C. for 2 minutes. After the incubation, a suspension of human liver S9 (the supernatant fraction obtained by centrifuging comminuted human liver cell fluid at 9000×g) in potassium phosphate buffer was added to the system, to the final concentration of 0.5 mg protein/mL. This reaction mixture was incubated at 37° C. for 5 minutes, and to which 4 volume times the reaction mixture of acetonitrile was added, mixed, cooled with ice and centrifuged (2000×g, 10 minutes). A part of the supernatant was taken and analyzed by LC/MS/MS, to determine the remaining rate of unchanged substance in the reaction solution. The results are shown in the following Table A, concurrently with the measured results of TNF-α production-inhibiting action in (1) above.

TABLE A

TNF-α generation-
Metabolic rate

inhibiting action
(remaining ratio of

(inhibition:
unchanged

Compound
Structural formula
rate: %, 100 nM)
substance: %)

Example 103

65.5
17.6

Example 106

52.9
23.3

Example 117

58.1
50.5

Example 123

78.1
58.0

Example 124

85.2
59.7

Example 125

66.0
20.1

Thus the pyridylisoxazole derivatives represented by the formula (I) of the present invention or their pharmaceutically acceptable salts can be orally or parenterally (e.g., intramuscular injection, intravenous injection, intrarectal or percutaneous administration and the like) administered to patients who need the therapy, treatment or prophylaxis as medicines for therapy, treatment or prophylaxis of human or other mammals' diseases, as p38MAPkinase inhibitor having excellent activity and high metabolic rate.

Where the compounds of the present invention are used as medicines, they can be formulated into certain preparation forms according to their utility, with non-toxic excipients, such as solids (e.g., tablet, hard capsule, soft capsule, granule, powder, grain, pill, troche and the like); semi-solids (e.g., suppository, ointment and the like) or liquid (e.g., injection, emulsion, suspension, lotion, spray and the like). As the non-toxic excipients useful for such preparations, for example, starch, gelatine, glucose, lactose, fructose, maltose, magnesium carbonate, talc, magnesium stearate, methyl cellulose, carboxymethyl cellulose or salts thereof, gum arabic, polyethylene glycol, alkyl p-hydroxybenzoate, syrup, ethanol, propylene glycol, petrolatum, carbowax, glycerine, sodium chloride, sodium sulfite, sodium phosphate, citric acid and the like can be named. The preparations can also contain other therapeutically useful medicines.

Thus, according to the present invention, pharmaceutical compositions containing effective amount of the pyridylisoxazole derivatives represented by the formula (I) or pharmaceutically acceptable salts thereof, concurrently with non-toxic excipients are provided.

While the content of a compound of the present invention in such preparations or compositions differs according to the preparation form, in general terms it is desirable to be within a range of 0.1-50% by weight for solid and semi-solid forms, and within a range of 0.05-10% by weight for liquid forms.

The administration dosage of a compound of the present invention is variable over a wide range according to the species, age, body weight, administration route, seriousness of symptoms and doctor's diagnosis, of the patients including human and other warm-blooded animals. Whereas, in general terms, it can range 0.02-20 mg/kg, preferably 0.2-8 mg/kg, per day. Obviously, dosages less than the lower limit or more than the upper limit of the above-specified range may be administered depending on seriousness of the patient's symptoms, doctor's diagnosis and the like. The dosage can be administered as a single dose or plural divided doses per day.

EXAMPLES

Hereinafter the present invention is explained in further details, referring to Examples and Preparation Examples.

Example 1
3-(2,3-Difluorophenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole
a) 5-Amino-3-(2,3-difluorophenyl)-4-(4-pyridyl)isoxazole

In 15 mL of methanol, 2.31 g of 28% sodium methoxide-methanol solution was dissolved, and a suspension of 0.93 g of 4-pyridylacetonitrile hydrochloride in 10 mL of THF was added, followed by an hour's stirring at room temperature. Then a solution of 1.15 g of 2,3-difluorobenzhydroxymoyl chloride in 5 mL of methanol was added dropwise, followed by 20 hours' stirring at room temperature. The reaction solution was extracted with ethyl acetate after addition of water. The ethyl acetate extract was washed with brine, dried over anhydrous magnesium sulfate, and removed of the solvent by reduced pressure distillation. The resultant residue was purified on 100 g silica gel column chromatography (eluent, ethyl acetate→ethyl acetate:methanol=9:1) to provide 1.06 g (yield: 65%) of the title compound as pale yellow crystal.

¹H-NMR (CDCl₃) δ: 8.51 (dd, J=1.7 Hz, 4.4 Hz, 2H), 7.31-7.21 (m, 2H), 7.19-7.13 (m, 1H), 7.00 (dd, J=1.7 Hz, 4.4 Hz, 2H), 4.94 (bs, 2H)

Mass, m/e: 273 (M⁺), 63 (base)

b) 3-(2,3-Difluorophenyl)-5-(Phenylacetylamino)-4-(4-pyridyl)-isoxazole

In 3 mL of THF, 68 mg of imidazole and 152 mg of DBU were dissolved, into which 155 mg of phenylacetyl chloride was dropped under cooling with ice and stirring, followed by 1.5 hours' stirring at room temperature. Then a solution of 137 mg of 5-amino-3-(2,3-difluorophenyl)-4-(4-pyridyl)isoxazole and 152 mg of DBU in 3 mL of THF was added dropwise, followed by 26 hours' stirring at room temperature. After addition of water, the reaction solution was extracted with ethyl acetate. The ethyl acetate extract was washed first with saturated aqueous NaHCO₃solution and then with brine, dried over anhydrous magnesium sulfate, and removed of the solvent by reduced pressure distillation. The resultant residue was purified by thin-layer silica gel chromatography (developer, hexane:ethyl acetate=1:1) to provide 88 mg (yield: 45%) of the title compound as colorless crystal.

¹H-NMR (CDCl₃) δ: 8.43 (dd, J=1.6 Hz, 4.5 Hz, 2H), 7.78 (bs, 1H), 7.43-7.13 (m, 8H), 6.81 (dd, J=1.6 Hz, 4.5 Hz, 2H), 3.78 (s, 2H)

Mass, m/e: 391 (M⁺), 91 (base)

Example 2
5-[2-(2-chlorophenyl)acetylamino]-3-(2,3-difluorophenyl)-4-(4-pyridyl)isoxazole

To a solution of 0.171 g of 2′-chlorophenylacetic acid in 5 mL of THF, 0.162 g of CDI was added, and stirred at room temperature for 1.5 hours. Then a solution of 0.152 g of DBU and 0.137 g of 5-amino-3-(2,3-difluorophenyl)-4-(4-pyridyl)isoxazole in 1 mL of THF was added, and stirred at room temperature for 18 hours. After addition of water, the reaction solution was extracted with ethyl acetate. The ethyl acetate extract was washed first with saturated aqueous NaHCO₃solution and then with brine, dried over anhydrous magnesium sulfate, and removed of the solvent by reduced pressure distillation. The resultant residue was purified on 3 g silica gel column chromatography (eluent, ethyl acetate) to provide 0.126 g (yield, 59%) of the title compound as pale yellow crystal.

¹H-NMR (CDCl₃) δ: 8.45 (dd, J=1.5 Hz, 4.4 Hz, 2H), 7.83 (bs, 1H), 7.47-7.43 (m, 1H), 7.36-7.12 (m, 6H), 6.91 (dd, J=1.5 Hz, 4.4 Hz, 2H), 3.89 (s, 2H)

Mass, m/e: 425 (M⁺), 125 (base)

In the following, the compounds of Examples 3-183 were synthesized in the manner similar to Examples 1 and 2.

Example 3
3-(2,3-Difluorophenyl)-5-(phenylpropionylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.41 (dd, J=1.5 Hz, 4.6 Hz, 2H), 8.02 (bs, 1H), 7.32-7.13 (m, 8H), 6.87 (dd, J=1.5 Hz, 4.6 Hz, 2H), 3.01 (t, J=7.3 Hz, 2H), 2.77 (t, J=7.3 Hz, 2H)

Mass, m/e: 405 (M⁺), 91 (base)

Example 4
3-(2,4-Difluorophenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole
a) 5-Amino-3-(2,4-difluorophenyl-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.50 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.52-7.45 (m, 1H), 7.00-6.96 (m, 3H), 6.87-6.80 (m, 1H), 4.93 (bs, 2H)

Mass, m/e: 273 (M⁺), 63 (base)

3-(2,4-Difluorophenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.43 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.50-7.34 (m, 4H), 7.30-7.25 (m, 2H), 7.00-6.94 (m, 1H), 6.83-6.77 (m, 3H), 3.77 (s, 2H)

Mass, m/e: 391 (M⁺), 91 (base)

Example 5
5-[2-(2-Chlorophenyl)acetylamino]-3-(2,4-difluorophenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 11.24 (bs, 1H), 8.49 (dd, J=1.6 Hz, 4.5 Hz, 2H), 7.68-7.61 (m, 1H), 7.46-7.36 (m, 3H), 7.33-7.24 (m, 3H), 7.09 (dd, J=1.6 Hz, 4.5 Hz, 2H), 3.91 (s, 2H)

Mass, m/e: 425 (M⁺), 125 (base)

Example 6
3-(2,4-Difluorophenyl)-5-(phenylpropionylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.45 (dd, J=1.6 Hz, 4.5 Hz, 2H), 7.76 (bs, 1H), 7.50-7.43 (m, 1H), 7.33-7.17 (m, 5H), 7.01-6.95 (m, 1H), 6.88 (dd, J=1.6 Hz, 4.5 Hz, 2H), 6.84-6.78 (m, 1H), 3.01 (t, J=7.4 Hz, 2H), 2.77 (t, J=7.4 Hz, 2H)

Mass, m/e: 405 (M⁺), 91 (base)

Example 7
5-[(2-Chlorophenyl)propionylamino]-3-(2,4-difluorophenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.42 (d, J=6.1 Hz, 2H), 8.26 (bs, 1H), 7.49-7.43 (m, 1H), 7.35-7.31 (m, 1H), 7.24-7.15 (m, 3H), 6.99-6.94 (m, 1H), 6.91 (d, J=6.1 Hz, 2H), 6.82-6.77 (m, 1H), 3.11 (t, J=7.6 Hz, 2H), 2.78 (t, J=7.6 Hz, 2H)

Mass, m/e: 439 (M⁺), 273 (base)

Example 8
5-[(3-Chlorophenyl)propionylamino]3-(2,4-difluorophenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.44 (bs, 1H), 8.39 (d, J=5.8 Hz, 2H), 7.48-7.43 (m, 1H), 7.21-7.18 (m, 3H), 7.08-7.06 (m, 1H), 6.99-6.94 (m, 1H), 6.88 (d, J=6.0 Hz, 2H), 6.82-6.77 (m, 1H), 2.98 (t, J=7.0 Hz, 2H), 2.77 (t, J=7.0 Hz, 2H)

Mass, m/e: 439 (M⁺), 273 (base)

Example 9
3-(2,4-Difluorophenyl)-5-[(2-methylphenyl)propionylamino]-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.40 (d, J=5.9 Hz, 2H), 8.22 (bs, 1H), 7.49-7.43 (m, 1H), 7.15-7.10 (m, 4H), 6.99-6.94 (m, 1H), 6.89 (d, J=5.9 Hz, 2H), 6.82-6.77 (m, 1H), 3.00 (t, J=7.6 Hz, 2H), 2.72 (t, J=7.6 Hz, 2H), 2.28 (s, 3H)

Mass, m/e: 419 (M⁺), 105 (base)

Example 10
3-(2,4-Difluorophenyl)-5-[(3-methylphenyl)propionylamino]-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.43 (dd, J=1.7 Hz, 4.5 Hz, 2H), 7.83 (bs, 1H), 7.49-7.43 (m, 1H), 7.11-7.06 (m, 4H), 6.99-6.95 (m, 1H), 6.87 (dd, J=1.7 Hz, 4.5 Hz, 2H), 6.83-6.77 (m, 1H), 2.96 (t, J=7.2 Hz, 2H), 2.74 (t, J=7.2 Hz, 2H), 2.32 (s, 3H)

Mass, m/e: 419 (M⁺), 105 (base)

Example 11
3-(2,6-Difluorophenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole
a) 5-Amino-3-(2,6-difluorophenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.48 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.47-7.39 (m, 1H), 7.00-6.95 (m, 4H), 4.97 (bs, 2H)

Mass, m/e: 273 (M⁺), 63 (base)

b) 3-(2,6-Difluorophenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.42 (dd, J=1.5 Hz, 4.7 Hz, 2H), 7.45-7.37 (m, 5H), 7.31-7.29 (m, 2H), 6.98-6.92 (m, 2H), 6.81 (dd, J=1.5 Hz, 4.6 Hz, 2H), 3.79 (s, 2H)

Mass, m/e: 391 (M⁺), 91 (base)

Example 12
5-[2-(2-Chlorophenyl)acetylamino]-3-(2,6-difluorophenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.43 (dd, J=1.5 Hz, 4.4 Hz, 2H), 7.79 (bs, 1H), 7.47-7.30 (m, 5H), 6.97-6.93 (m, 2H), 6.91 (dd, J=1.5 Hz, 4.4 Hz, 2H), 3.90 (s, 2H)

Mass, m/e: 425 (M⁺), 125 (base)

Example 13
3-(3,4-Difluorophenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole
a) 5-Amino-3-(3,4-difluorophenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 8.44 (dd, J=1.2 Hz, 4.8 Hz, 2H), 7.54-7.36 (m, 2H), 7.32 (bs, 2H), 7.19-7.13 (m, 1H), 7.05 (dd, J=1.2 Hz, 4.8 Hz, 2H)

Mass, m/e: 273 (M⁺), 63 (base)

b) 3-(3,4-Difluorophenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (DMSO-d₆) δ: 11.09 (bs, 1H), 8.47 (dd, J=1.3 Hz, 4.8 Hz, 2H), 7.56-7.45 (m, 2H), 7.36-7.23 (m, 5H), 7.22-7.17 (m, 1H), 7.07 (dd, J=1.3 Hz, 4.8 Hz, 2H), 3.67 (s, 2H)

Mass, m/e: 391 (M⁺), 91 (base)

Example 14
5-[2-(2-Chlorophenyl)acetylamino]-3-(3,4-difluorophenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 11.14 (bs, 1H), 8.54 (dd, J=1.5 Hz, 4.4 Hz, 2H), 7.51-7.18 (m, 7H), 7.18 (dd, J=1.5 Hz, 4.4 Hz, 2H), 3.87 (s, 2H)

Mass, m/e: 391 (M⁺), 91 (base)

Example 15
3-(3-Chloro-2-fluorophenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole
a) 5-Amino-3-(3-chloro-2-fluorophenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 8.40 (dd, J=1.5 Hz, 4.5 Hz, 2H), 7.78-7.73 (m, 1H), 7.48-7.44 (m, 3H), 7.36 (td, J=0.8 Hz, 7.9 Hz, 1H), 6.98 (dd, J=1.5 Hz, 4.5 Hz, 2H)

Mass, m/e: 289 (M⁺), 63 (base)

b) 3-(3-Chloro-2-fluorophenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.43 (dd, J=1.7 Hz, 4.4 Hz, 2H), 7.78 (bs, 1H), 7.53-7.48 (m, 1H), 7.43-7.32 (m, 5H), 7.30-7.28 (m, 1H), 7.17 (td, J=1.2 Hz, 7.9 Hz, 1H), 6.80 (dd, J=1.7 Hz, 4.4 Hz, 2H), 3.78 (s, 2H)

Mass, m/e: 407 (M⁺), 91 (base)

Example 16
5-[(2-Chlorophenyl)acetylamino]-3-(3-chloro-2-fluorophenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 11.28 (bs, 1H), 8.49 (dd, J=1.6 Hz, 4.5 Hz, 2H), 7.82-7.76 (m, 1H), 7.55-7.50 (m, 1H), 7.47-7.36 (m, 3H), 7.34-7.29 (m, 2H), 7.10 (dd, J=1.6 Hz, 4.5 Hz, 2H), 3.91 (s, 2H)

Mass, m/e: 441 (M⁺), 125 (base)

Example 17
3-(3-Chloro-2-fluorophenyl)-5-(phenylpropionylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.42 (dd, J=1.5 Hz, 4.6 Hz, 2H), 8.00 (bs, 1H), 7.54-7.49 (m, 1H), 7.37-7.27 (m, 3H), 7.25-7.15 (m, 4H), 6.86 (dd, J=1.5 Hz, 4.6 Hz, 2H), 3.02 (t, J=7.4 Hz, 2H), 2.78 (t, J=7.4 Hz, 2H)

Mass, m/e: 421 (M⁺), 91 (base)

Example 18
3-(4-Chloro-2-fluorophenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole
a) 5-Amino-3-(4-chloro-2-fluorophenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 8.40 (d, J=5.4 Hz, 2H), 7.53-7.51 (m, 2H), 7.43 (m, 3H), 6.98 (d, J=5.4 Hz, 2H)

Mass, m/e: 289 (M⁺), 63 (base)

b) 3-(4-Chloro-2-fluorophenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.43 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.66 (bs, 1H), 7.43-7.35 (m, 4H), 7.28-7.22 (m, 3H), 7.07 (dd, J=1.9 Hz, 9.6 Hz, 1H), 6.79 (dd, J=1.5 Hz, 4.6 Hz, 2H), 3.77 (s, 2H)

Mass, m/e: 407 (M⁺), 91 (base)

Example 19
5-[(2-Chlorophenyl)acetylamino]-3-(4-chloro-2-fluorophenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 11.25 (bs, 1H), 8.49 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.62-7.56 (m, 2H), 7.48-7.38 (m, 3H), 7.33-7.28 (m, 2H), 7.10 (dd, J=1.5 Hz, 4.6 Hz, 2H), 3.91 (s, 2H)

Mass, m/e: 441 (M⁺), 125 (base)

Example 20
3-(4-Chloro-2-fluorophenyl)-5-(phenylpropionylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.44 (bs, 1H), 8.37 (d, J=5.5 Hz, 2H), 7.40 (t, J=7.7 Hz, 1H), 7.30-7.17 (m, 6H), 7.07 (dd, J=1.9 Hz, 9.6 Hz, 1H), 6.85 (d, J=5.5 Hz, 2H), 3.00 (t, J=7.3 Hz, 2H), 2.76 (t, J=7.3 Hz, 2H)

Mass, m/e: 421 (M⁺), 91 (base)

Example 21
3-(4-Chloro-3-fluorophenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole
a) 5-Amino-3-(4-chloro-3-fluorophenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.56 (dd, J=1.5 Hz, 4.2 Hz, 2H), 7.38 (t, J=8.0 Hz, 1H), 7.25 (dd, J=1.9 Hz, 9.6 Hz, 1H), 7.13-7.11 (m, 1H), 7.05 (dd, J=1.5 Hz, 4.2 Hz, 2H), 4.91 (bs, 2H)

Mass, m/e: 289 (M⁺), 63 (base)

b) 3-(4-Chloro-3-fluorophenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (DMSO-d₆) δ: 11.12 (bs, 1H), 8.48 (dd, J=1.7 Hz, 4.4 Hz, 2H), 7.68 (t, J=8.0 Hz, 1H), 7.45 (dd, J=1.9 Hz, 10 Hz, 1H), 7.35-7.25 (m, 5H), 7.19 (dd, J=1.1 Hz, 8.1 Hz, 1H), 7.08 (dd, J=1.7 Hz, 4.4 Hz, 2H), 3.68 (s, 2H)

Mass, m/e: 407 (M⁺), 91 (base)

Example 22
5-[(2-Chlorophenyl)acetylamino]-3-(4-chloro-3-fluorophenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 11.17 (bs, 1H), 8.54 (dd, J=1.5 Hz, 4.2 Hz, 2H), 7.68 (t, J=8.0 Hz, 1H), 7.47 (dd, J=1.9 Hz, 10 Hz, 1H), 7.44-7.41 (m, 1H), 7.38-7.35 (m, 1H), 7.31-7.29 (m, 2H), 7.22-7.20 (m, 1H), 7.19 (dd, J=1.5 Hz, 4.2 Hz, 2H), 3.87 (s, 2H)

Mass, m/e: 442 (M⁺), 125 (base)

Example 23
3-(4-Chloro-3-fluorophenyl)-5-(phenylpropionylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (DMSO-d₆) δ: 10.91 (bs, 1H), 8.52 (dd, J=1.5 Hz, 4.4 Hz, 2H), 7.68 (t, J=8.0 Hz, 1H), 7.45 (dd, J=1.9 Hz, 10 Hz, 1H), 7.30-7.27 (m, 2H), 7.22-7.18 (m, 4H), 7.09 (dd, J=1.5 Hz, 4.4 Hz, 2H), 2.86 (t, J=7.3 Hz, 2H), 2.68 (t, J=7.3 Hz, 2H)

Mass, m/e: 421 (M⁺), 91 (base)

Example 24
3-(2-Chloro-4-fluorophenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole
a) 5-Amino-3-(2-chloro-4-fluorophenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 8.36 (dd, J=1.6 Hz, 4.5 Hz, 2H), 7.61-7.56 (m, 2H), 7.37 (td, J=2.7 Hz, 8.5 Hz, 1H), 6.92 (dd, J=1.6 Hz, 4.5 Hz, 2H)

Mass, m/e: 289 (M⁺), 63 (base)

b) 3-(2-Chloro-4-fluorophenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.39 (dd, J=1.7 Hz, 4.4 Hz, 2H), 7.84 (bs, 1H), 7.45-7.27 (m, 6H), 7.14 (dd, J=2.8 Hz, 8.4 Hz, 1H), 7.08 (td, J=2.8 Hz, 8.4 Hz, 1H), 6.73 (dd, J=1.7 Hz, 4.4 Hz, 2H), 3.78 (s, 2H)

Mass, m/e: 407 (M⁺), 91 (base)

Example 25
5-[(2-Chlorophenyl)acetylamino]-3-(2-chloro-4-fluorophenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.41 (dd, J=1.5 Hz, 4.2 Hz, 2H), 7.89 (bs, 1H), 7.48-7.29 (m, 5H), 7.15 (dd, J=2.5 Hz, 8.3 Hz, 1H), 7.09 (td, J=2.5 Hz, 8.3 Hz, 1H), 6.84 (dd, J=1.5 Hz, 4.2 Hz, 2H), 3.90 (s, 2H)

Mass, m/e: 441 (M⁺), 125 (base)

Example 26
3-(2-Chloro-4-fluorophenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.39 (dd, J=1.7 Hz, 4.4 Hz, 2H), 7.99 (bs, 1H), 7.42 (dd, J=5.8 Hz, 8.5 Hz, 1H), 7.33-7.27 (m, 2H), 7.24-7.18 (m, 3H), 7.15 (dd, J=2.7 Hz, 8.5 Hz, 1H), 7.11-7.06 (m, 1H), 6.81 (dd, J=1.7 Hz, 4.4 Hz, 2H), 3.02 (t, J=7.3 Hz, 2H), 2.78 (t, J=7.3 Hz, 2H)

Mass, m/e: 421 (M⁺), 91 (base)

Example 27
3-(3-Chloro-4-fluorophenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole
a) 5-Amino-3-(3-chloro-4-fluorophenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 8.45 (dd, J=1.6 Hz, 4.5 Hz, 2H), 7.56 (dd, J=2.1 Hz, 7.1 Hz, 1H), 7.48 (t, J=8.9 Hz, 1H), 7.35-7.29 (m, 3H), 7.05 (dd, J=1.6 Hz, 4.5 Hz, 2H)

Mass, m/e: 289 (M⁺), 63 (base)

b) 3-(3-Chloro-4-fluorophenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (DMSO-d₆) δ: 11.10 (bs, 1H), 8.47 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.62 (dd, J=2.5 Hz, 7.1 Hz, 1H), 7.50 (t, J=8.9 Hz, 1H), 7.37-7.24 (m, 6H), 7.07 (dd, J=1.5 Hz, 4.6 Hz, 2H), 3.68 (s, 2H)

Mass, m/e: 407 (M⁺), 91 (base)

Example 28
5-[2-(2-Chlorophenyl)acetylamino]-3-(3-chloro-4-fluorophenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 11.15 (bs, 1H), 8.54 (dd, J=1.5 Hz, 4.4 Hz, 2H), 7.63 (dd, J=2.1 Hz, 7.1 Hz, 1H), 7.50 (t, J=8.9 Hz, 1H), 7.45-7.27 (m, 5H), 7.19 (dd, J=1.5 Hz, 4.4 Hz, 2H), 3.87 (s, 2H)

Mass, m/e: 441 (M⁺), 125 (base)

Example 29
3-(3-Bromo-4-fluorophenyl)-5-(Phenylacetylamino)-4-(4-pyridyl)-isoxazole
a) 5-Amino-3-(3-bromo-4-fluorophenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.57 (dd, J=1.5 Hz, 4.2 Hz, 2H), 7.72 (dd, J=1.9 Hz, 6.6 Hz, 1H), 7.30-7.26 (m, 1H), 7.10 (t, J=8.5 Hz, 1H), 7.05 (dd, J=1.5 Hz, 4.2 Hz, 2H), 4.69 (bs, 2H)

Mass, m/e: 333 (M⁺), 63 (base)

b) 3-(3-Bromo-4-fluorophenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.51 (dd, J=1.5 Hz, 4.2 Hz, 2H), 7.68 (dd, J=2.3 Hz, 6.6 Hz, 1H), 7.50 (bs, 1H), 7.42-7.37 (m, 3H), 7.27-7.18 (m, 3H), 7.07 (t, J=8.5 Hz, 1H), 6.90 (dd, J=1.5 Hz, 4.2 Hz, 2H), 3.76 (s, 2H)

Mass, m/e: 451 (M⁺), 91 (base)

Example 30
3-(3-Bromo-4-fluorophenyl)-5-[2-(2-chlorophenyl)acetylamino]-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.53 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.69 (dd, J=2.3 Hz, 6.6 Hz, 1H), 7.54 (bs, 1H), 7.46-7.43 (m, 1H), 7.34-7.29 (m, 3H), 7.21-7.20 (m, 1H), 7.08 (t, J=8.5 Hz, 1H), 6.99 (dd, J=1.5 Hz, 4.6 Hz, 2H), 3.87 (s, 2H)

Mass, m/e: 487 (M⁺), 125 (base)

Example 31
3-(3-Bromo-4-fluorophenyl)-5-[2-(3-methoxyphenyl)acetylamino]-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.52 (dd, J=1.5 Hz, 4.2 Hz, 2H), 7.67 (dd, J=2.3 Hz, 6.4 Hz, 1H), 7.53 (bs, 1H), 7.31 (t, J=7.7 Hz, 1H), 7.20-7.18 (m, 1H), 7.08 (t, J=8.4 Hz, 1H), 6.90 (dd, J=1.5 Hz, 4.2 Hz, 3H), 6.83 (d, J=7.7 Hz, 1H), 6.78 (bs, 1H), 3.80 (s, 3H), 3.72 (s, 2H)

Mass, m/e: 482 (M⁺), 121 (base)

Example 32
3-(3-Bromo-4-fluorophenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.53 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.67 (dd, J=1.9 Hz, 6.6 Hz, 1H), 7.58 (bs, 1H), 7.32-7.17 (m, 6H), 7.08 (t, J=8.1 Hz, 1H), 6.96 (dd, J=1.5 Hz, 4.6 Hz, 2H), 3.01 (t, J=7.3 Hz, 2H), 2.75 (t, J=7.3 Hz, 2H)

Mass, m/e: 465 (M⁺), 91 (base)

Example 33
5-(Phenylacetylamino)-3-(3,4-dichlorophenyl)-4-(4-pyridyl)isoxazole
a) 5-Amino-3-(3,4-dichlorophenyl-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.57 (dd, J=1.6 Hz, 4.5 Hz, 2H), 7.59 (d, J=1.9 Hz, 1H), 7.43 (d, J=8.3 Hz, 1H), 7.20 (dd, J=1.9 Hz, 8.3 Hz, 1H), 7.05 (dd, J=1.6 Hz, 4.5 Hz, 2H), 4.89 (bs, 2H)

Mass, m/e: 305 (M⁺), 63 (base)

b) 5-(Phenylacetylamino)-3-(3,4-dichlorophenyl)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.51 (dd, J=1.5 Hz, 4.3 Hz, 2H), 7.55 (bs, 1H), 7.54 (d, J=2.3 Hz, 1H), 7.42-7.34 (m, 4H), 7.27-7.24 (m, 2H), 7.11 (dd, J=1.9 Hz, 8.4 Hz, 1H), 6.90 (dd, J=1.6 Hz, 4.3 Hz, 2H), 3.76 (s, 2H)

Mass, m/e: 423 (M⁺), 91 (base)

Example 34
5-[(2-Chlorophenyl)acetylamino]-3-(3,4-dichlorophenyl)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.53 (dd, J=1.6 Hz, 4.5 Hz, 2H), 7.70 (bs, 1H), 7.56 (d, J=2.1 Hz, 1H), 7.46-7.39 (m, 2H), 7.35-7.28 (m, 3H), 7.13 (dd, J=2.1 Hz, 8.3 Hz, 1H), 6.99 (dd, J=1.6 Hz, 4.5 Hz, 2H), 3.87 (s, 2H)

Mass, m/e: 457 (M⁺), 125 (base)

Example 35
3-(3,4-Dichlorophenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (DMSO-d₆) δ: 8.53 (dd, J=1.5 Hz, 4.4 Hz, 2H), 7.72 (d, J=8.1 Hz, 1H), 7.65 (d, J=1.9 Hz, 1H), 7.33-7.25 (m, 3H), 7.24-7.18 (m, 3H), 7.10 (dd, J=1.5 Hz, 4.4 Hz, 2H), 2.86 (t, J=7.3 Hz, 2H), 2.68 (t, J=7.3 Hz, 2H)

Mass, m/e: 437 (M⁺), 91 (base)

Example 36
5-[(2-chlorophenyl)acetylamino]-3-(2,6-dichlorophenyl)-4-(4-pyridyl)-isozazole
a) 5-Amino-3-(2,6-dichlorophenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 8.36 (dd, J=1.9 Hz, 4.6 Hz, 2H), 7.64-7.54 (m, 5H), 6.90 (dd, J=1.9 Hz, 4.6 Hz, 2H)

Mass, m/e: 305 (M⁺), 63 (base)

b) 5-[(2-Chlorophenyl)acetylamino]-3-(2,6-dichlorophenyl)-4-(4-pyridyl)isozazole

¹H-NMR (DMSO-d₆) δ: 11.44 (bs, 1H), 8.44 (dd, J=1.7 Hz, 4.6 Hz, 2H), 7.67-7.58 (m, 3H), 7.46-7.40 (m, 2H), 7.33-7.29 (m, 2H), 6.99 (dd, J=1.7 Hz, 4.6 Hz, 2H), 3.93 (s, 2H)

Mass, m/e: 457 (M⁺), 125 (base)

Example 37
3-(2,6-Dichlorophenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.38 (dd, J=1.5 Hz, 4.4 Hz, 2H), 8.10 (bs, 1H), 7.38-7.18 (m, 8H), 6.86 (dd, J=1.5 Hz, 4.4 Hz, 2H), 3.01 (t, J=7.3 Hz, 2H), 2.78 (t, J=7.3 Hz, 2H)

Mass, m/e: 437 (M⁺), 91 (base)

Example 38
3-(3,5-Dichlorophenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole
a) 5-Amino-3-(3,5-dichlorophenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 8.47 (dd, J=1.6 Hz, 4.5 Hz, 2H), 7.75 (t, J=1.9 Hz, 1H), 7.41-7.37 (bs, 2H), 7.35 (d, J=1.9 Hz, 2H), 7.06 (dd, J=1.6 Hz, 4.5 Hz, 2H)

Mass, m/e: 305 (M⁺), 63 (base)

b) 3-(3,5-Dichlorophenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.52 (dd, J=1.5 Hz, 4.4 Hz, 2H), 7.60 (bs, 1H), 7.42-7.36 (m, 4H), 7.28-7.23 (m, 4H), 6.89 (dd, J=1.5 Hz, 4.4 Hz, 2H), 3.76 (s, 2H)

Mass, m/e: 423 (M⁺), 91 (base)

Example 39
5-[(2-Fluorophenyl)acetylamino]-3-(3,5-dichlorophenyl)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.53 (dd, J=4.5 Hz, 6.2 Hz, 2H), 7.79-7.72 (bs, 1H), 7.42 (t, J=1.7 Hz, 1H), 7.39-7.09 (m, 6H), 6.97 (dd, J=4.5 Hz, 6.2 Hz, 2H), 3.77 (s, 2H)

Mass, m/e: 441 (M⁺), 109 (base)

Example 40
5-[(2-Chlorophenyl)acetylamino]-3-(3,5-dichlorophenyl)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.55 (dd, J=4.4 Hz, 6.2 Hz, 2H), 7.55-7.50 (bs, 1H), 7.47-7.40 (m, 2H), 7.36-7.29 (m, 3H), 7.28-7.24 (m, 2H), 6.99 (dd, J=4.4 Hz, 6.2 Hz, 2H), 3.87 (s, 2H)

Mass, m/e: 457 (M⁺), 125 (base)

Example 41
3-(3,5-Dichlorophenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.54 (dd, J=1.6 Hz, 4.3 Hz, 2H), 7.56-7.52 (bs, 1H), 7.42 (t, J=1.9 Hz, 1H), 7.33-7.16 (m, 7H), 6.96 (dd, J=1.6 Hz, 4.3 Hz, 2H), 3.01 (t, J=7.3 Hz, 2H), 2.75 (t, J=7.3 Hz, 2H)

Mass, m/e: 437 (M⁺), 91 (base)

Example 42
5-(Phenylacetylamino)-4-(4-pyridyl)-3-(2,3,4-trifluorophenyl)isoxazole
a) 5-Amino-4-(4-pyridyl)-3-(2,3,4-trifluorophenyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.53 (dd, J=1.5 Hz, 4.4 Hz, 2H), 7.23-7.19 (m, 1H), 7.09-7.03 (m, 1H), 6.99 (dd, J=1.5H, 4.4 Hz, 2H), 4.95 (bs, 2H)

Mass, m/e: 291 (M⁺), 63 (base)

b) 5-(Phenylacetylamino)-4-(4-pyridyl)-3-(2,3,4-trifluorophenyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.45 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.67 (bs, 1H), 7.43-7.35 (m, 3H), 7.30-7.27 (m, 2H), 7.22-7.18 (m, 1H), 7.09-7.05 (m, 1H), 6.80 (dd, J=1.5 Hz, 4.6 Hz, 2H), 3.77 (s, 2H)

Mass, m/e: 409 (M⁺), 91 (base)

Example 43
5-[2-(2-Chlorophenyl)acetylamino]-4-(4-pyridyl)-3-(2,3,4-trifluorophenyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.47 (dd, J=1.5 Hz, 4.2 Hz, 2H), 7.75 (bs, 1H), 7.35-7.30 (m, 4H), 7.23-7.19 (m, 1H), 7.10-7.03 (m, 1H), 6.90 (dd, J=1.5 Hz, 4.2 Hz, 2H), 3.89 (s, 2H)

Mass, m/e: 443 (M⁺), 125 (base)

Example 44
5-(Phenylacetylamino)-4-(4-pyridyl)-3-(2,4,5-trifluorophenyl)-isoxazole
a) 5-Amino-4-(4-pyridyl)-3-(2,4,5-trifluorophenyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.53 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.40-7.34 (m, 1H), 7.00-6.92 (m, 3H), 4.94 (bs, 2H)

Mass, m/e: 291 (M⁺), 63 (base)

b) 5-(Phenylacetylamino)-4-(4-pyridyl)-3-(2,4,5-trifluorophenyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.45 (dd, J=1.5 Hz, 4.2 Hz, 2H), 7.63 (bs, 1H), 7.41-7.28 (m, 7H), 6.94-6.88 (m, 1H), 6.80 (dd, J=1.5 Hz, 4.2 Hz, 1H), 3.77 (s, 2H)

Mass, m/e: 409 (M⁺), 91 (base)

Example 45
5-[2-(2-Chlorophenyl)acetylamino]-4-(4-pyridyl)-3-(2,4,5-trifluorophenyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.47 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.69 (bs, 1H), 7.47-7.44 (m, 1H), 7.37-7.30 (m, 4H), 6.95-6.89 (m, 3H) 3.89 (s, 2H)

Mass, m/e: 443 (M⁺), 125 (base)

Example 46
5-(3-Phenylpropionylamino)-4-(4-pyridyl)-3-(2,4,5-trifluorophenyl)-isoxazol

¹H-NMR (DMSO-d₆) δ: 11.00 (bs, 1H), 8.47 (dd, J=1.5 Hz, 4.4 Hz, 2H), 7.83-7.66 (m, 2H), 7.32-7.28 (m, 2H), 7.23-7.20 (m, 3H), 7.01 (dd, J=1.5 Hz, 4.4 Hz, 2H), 2.88 (t, J=7.3 Hz, 2H), 2.71 (t, J=7.3H, 2H)

Mass, m/e: 423 (M⁺), 91 (base)

Example 47
5-(Phenylacetylamino)-4-(4-pyridyl)-3-(2,4,6-trifluorophenyl)isoxazole
a) 5-Amino-4-(4-pyridyl)-3-(2,4,6-trifluorophenyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.51 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.03-6.64 (m, 4H), 4.96 (bs, 2H)

Mass, m/e: 291 (M⁺), 63 (base)

b) 5-(Phenylacetylamino)-4-(4-pyridyl)-3-(2,4,6-trifluorophenyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.45 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.53 (bs, 1H), 7.43-7.35 (m, 3H), 7.29-7.27 (m, 2H), 6.81 (dd, J=1.5 Hz, 4.4 Hz, 2H), 6.75-6.70 (m, 2H), 3.78 (s, 2H)

Mass, m/e: 409 (M⁺), 91 (base)

Example 48
5-[2-(2-Chlorophenyl)acetylamino]-4-(4-pyridyl)-3-(2,4,6-trifluorophenyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.46 (dd, J=1.5 Hz, 4.4 Hz, 2H), 7.77 (bs, 1H), 7.47-7.45 (m, 1H), 7.37-7.30 (m, 3H), 6.91 (dd, J=1.5 Hz, 4.4 Hz, 2H), 6.76-6.70 (m, 2H), 3.90 (s, 2H)

Mass, m/e: 443 (M⁺), 125 (base)

Example 49
5-(3-Phenylpropionylamino)-4-(4-pyridyl)-3-(2,4,6-trifluorophenyl)-isoxazole

¹H-NMR (DMSO-d₆) δ: 11.10 (bs, 1H), 8.46 (dd, J=1.5 Hz, 4.2 Hz, 2H), 7.44-7.39 (m, 2H), 7.32-7.29 (m, 2H), 7.23-7.20 (m, 3H), 6.98 (dd, J=1.5 Hz, 4.2 Hz, 2H), 2.89 (t, J=7.3 Hz, 2H), 2.73 (t, J=7.3H, 2H)

Mass, m/e: 423 (M⁺), 91 (base)

Example 50
5-(Phenylacetylamino)-4-(4-pyridyl)-3-(3,4,5-trifluorophenyl)isoxazole
a) 5-Amino-4-(4-pyridyl)-3-(3,4,5-trifluorophenyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.58 (dd, J=1.9 Hz, 4.6 Hz, 2H), 7.09-7.05 (m, 4H), 4.90 (bs, 2H)

Mass, m/e: 291 (M⁺, base)

b) 5-(Phenylacetylamino)-4-(4-pyridyl)-3-(3,4,5-trifluorophenyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.52 (dd, J=1.5 Hz, 4.4 Hz, 2H), 7.66 (bs, 1H), 7.41-7.23 (m, 5H), 7.01 (dd, J=6.5 Hz, 8.0 Hz, 2H), 6.90 (dd, J=1.5 Hz, 4.4 Hz, 2H), 3.74 (s, 2H)

Mass, m/e: 409 (M⁺), 91 (base)

Example 51
5-[(2-Chlorophenyl)acetylamino]-4-(4-pyridyl)-3-(3,4,5-trifluorophenyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.54 (dd, J=1.5 Hz, 4.4 Hz, 2H), 7.76 (bs, 1H), 7.44-7.42 (m, 1H), 7.33-7.28 (m, 3H), 7.02 (dd, J=6.5 Hz, 7.7 Hz, 2H), 6.99 (dd, J=1.5 Hz, 4.4 Hz, 2H), 3.85 (s, 2H)

Mass, m/e: 443 (M⁺), 125 (base)

Example 52
5-(3-Phenylpropionylamino)-4-(4-pyridyl)-3-(3,4,5-trifluorophenyl)-isoxazole

¹H-NMR (DMSO-d₆) δ: 10.93 (bs, 1H), 8.52 (dd, J=1.7 Hz, 4.4 Hz, 2H), 7.36 (dd, J=6.9 Hz, 8.4 Hz, 2H), 7.30-7.27 (m, 2H), 7.23-7.19 (m, 3H), 7.09 (dd, J=1.7 Hz, 4.4 Hz, 2H), 2.86 (t, J=7.5 Hz, 2H), 2.68 (t, J=7.5 Hz, 2H)

Mass, m/e: 423 (M⁺), 91 (base)

Example 53
3-(2-Methoxyphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole
a) 5-Amino-3-(2-methoxyphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.45 (dd, J=4.6 Hz, 6.2 Hz, 2H), 7.49-7.40 (m, 2H), 7.04 (td, J=1.0 Hz, 7.8 Hz, 1H), 6.97 (dd, J=4.6 Hz, 6.2 Hz, 2H), 6.85 (d, J=7.8 Hz, 1H), 4.88-4.77 (bs, 2H), 3.37 (s, 3H)

Mass, m/e: 267 (M⁺), 63 (base)

b) 3-(2-Methoxyphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.39 (dd, J=1.5 Hz, 4.2 Hz, 2H), 7.53-7.26 (m, 7H), 7.04 (td, J=0.8 Hz, 7.7 Hz, 1H), 6.82-6.75 (m, 3H), 3.78 (s, 2H), 3.24 (s, 3H)

Mass, m/e: 385 (M⁺), 91 (base)

Example 54
5-[(2-Chlorophenyl)acetylamino]-3-(2-methoxyphenyl)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.40 (d, J=6.0 Hz, 2H), 7.58-7.51 (bs, 1H), 7.50-7.28 (m, 6H), 7.05 (t, J=7.3 Hz, 1H), 6.88 (d, J=6.0 Hz, 2H), 6.80 (d, J=8.5 Hz, 1H), 3.90 (s, 2H), 3.25 (s, 3H)

Mass, m/e: 419 (M⁺), 125 (base)

Example 55
3-(2-Methoxyphenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.42 (d, J=5.8 Hz, 2H), 7.61-7.54 (bs, 1H), 7.50-7.40 (m, 2H), 7.32-7.17 (m, 5H), 7.05 (m, 1H), 6.87 (dd, J=1.5 Hz, 4.6 Hz, 2H), 6.80 (d, J=8.1 Hz, 1H), 3.26 (s, 3H), 3.01 (t, J=7.3 Hz, 2H), 2.76 (t, J=7.3 Hz, 2H)

Mass, m/e: 399 (M⁺), 91 (base)

Example 56
3-(4-Methoxyphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole
a) 5-Amino-3-(4-methoxyphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.54 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.35 (dt, J=2.5 Hz, 8.9 Hz, 2H), 7.07 (dd, J=1.5 Hz, 4.6 Hz, 2H), 6.88 (dd, J=2.5 Hz, 8.9 Hz, 2H), 4.76 (bs, 2H), 3.82 (s, 3H)

Mass, m/e: 267 (M⁺), 63 (base)

b) 3-(4-Methoxyphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (DMSO-d₆) δ: 10.99 (bs, 1H), 8.46 (dd, J=1.5 Hz, 4.2 Hz, 2H), 7.36-7.24 (m, 7H), 7.06 (dd, J=1.5 Hz, 4.2 Hz, 2H), 7.02-6.97 (m, 2H), 3.78 (s, 3H), 3.67 (s, 2H)

Mass, m/e: 385 (M⁺), 91 (base)

Example 57
5-[(2-Chlorophenyl)acetylamino]-3-(4-methoxyphenyl)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.50 (dd, J=1.5 Hz, 4.4 Hz, 2H), 7.53 (bs, 1H), 7.45-7.42 (m, 1H), 7.35-7.26 (m, 5H), 7.00 (dd, J=1.5 Hz, 4.4 Hz, 2H), 6.88-6.84 (m, 2H), 3.87 (s, 2H), 3.81 (s, 3H)

Mass, m/e: 419 (M⁺), 125 (base)

Example 58
3-(4-Methoxyphenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.48 (dd, J=1.4 Hz, 4.5 Hz, 2H), 7.77 (bs, 1H), 7.32-7.16 (m, 7H), 6.98 (dd, J=1.4 Hz, 4.5 Hz, 2H), 6.88-6.83 (m, 2H), 3.81 (s, 3H), 3.00 (t, J=7.4 Hz, 2H), 2.75 (t, J=7.4 Hz, 2H)

Mass, m/e: 399 (M⁺), 91 (base)

Example 59
5-[(2-Chlorophenyl)propionylamino]-3-(4-methoxyphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 10.81 (bs, 1H), 8.51 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.44-7.41 (m, 1H), 7.30-7.24 (m, 5H), 7.09 (dd, J=1.5 Hz, 4.6 Hz, 2H), 6.99 (d, J=6.6 Hz, 2H), 3.79 (s, 3H), 2.95 (t, J=7.3 Hz, 2H), 2.69 (t, J=7.3 Hz, 2H)

Mass, m/e: 433 (M⁺), 267 (base)

Example 60
5-[(3-Chlorophenyl)propionylamino]-3-(4-methoxyphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.46 (d, J=5.8 Hz, 2H), 7.99 (bs, 1H), 7.28 (d, J=8.9 Hz, 2H), 7.20-7.18 (m, 3H), 7.07-7.05 (m, 1H), 6.99 (d, J=5.8 Hz, 2H), 6.85 (d, J=8.9 Hz, 2H), 3.81 (s, 3H), 2.97 (t, J=7.1 Hz, 2H), 2.74 (t, J=7.1 Hz, 2H)

Mass, m/e: 433 (M⁺), 135 (base)

Example 61
5-[(4-Chlorophenyl)propionylamino]-3-(4-methoxyphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 10.77 (bs, 1H), 8.50 (dd, J=1.7 Hz, 4.4 Hz, 2H), 7.33 (d, J=8.3 Hz, 2H), 7.28 (d, J=8.9 Hz, 2H), 7.22 (d, J=8.3 Hz, 2H), 7.06 (dd, J=1.7 Hz, 4.4 Hz, 2H), 6.99 (d, J=8.9 Hz, 2H), 3.78 (s, 3H), 2.84 (t, J=7.3 Hz, 2H), 2.66 (t, J=7.3 Hz, 2H)

Mass, m/e: 433 (M⁺), 125 (base)

Example 62
3-(4-Methoxyphenyl)-5-[(2-Methylphenyl)propionylamino]-4-(4-pyridyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 10.77 (bs, 1H), 8.51 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.29 (d, J=8.9 Hz, 2H), 7.16-7.10 (m, 4H), 7.08 (dd, J=1.5 Hz, 4.6 Hz, 2H), 6.99 (d, J=8.9 Hz, 2H), 3.78 (s, 3H), 2.83 (t, J=7.5 Hz, 2H), 2.62 (t, J=7.5 Hz, 2H), 2.27 (s, 3H)

Mass, m/e: 413 (M⁺), 105 (base)

Example 63
3-(4-Methoxyphenyl)-5-[(3-methylphenyl)propionylamino]-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.47 (d, J=5.8 Hz, 2H), 7.73 (bs, 1H), 7.28 (d, J=8.6 Hz, 2H), 7.17 (t, J=7.7 Hz, 1H), 7.04-7.00 (m, 3H), 6.97 (d, J=5.8 Hz, 2H), 6.85 (d, J=8.6 Hz, 2H), 3.80 (s, 3H), 2.96 (t, J=7.3 Hz, 2H), 2.73 (t, J=7.3 Hz, 2H), 2.31 (s, 3H)

Mass, m/e: 413 (M⁺), 105 (base)

Example 64
3-(4-Ethoxyphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole
a) 5-Amino-3-(4-ethoxyphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.52 (dd, J=1.6 Hz, 4.5 Hz, 2H), 7.33 (dt, J=2.5 Hz, 8.9 Hz, 2H), 7.07 (dd, J=1.6 Hz, 4.5 Hz, 2H), 6.87 (dt, J=2.5 Hz, 8.9 Hz, 2H), 4.83 (bs, 2H), 4.04 (q, J=6.9 Hz, 2H), 1.42 (t, J=6.9 Hz, 3H)

Mass, m/e: 281 (M⁺, base)

b) 3-(4-Ethoxyphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.46 (dd, J=1.9 Hz, 4.6 Hz, 2H), 7.55 (bs, 1H), 7.40-7.31 (m, 3H), 7.27-7.24 (m, 4H), 6.91 (dd, J=1.9 Hz, 4.6 Hz, 2H), 6.83 (d, J=8.9 Hz, 2H), 4.02 (q, J=6.9 Hz, 2H), 3.75 (s, 2H), 1.40 (t, J=6.9 Hz, 3H)

Mass, m/e: 399 (M⁺), 91 (base)

Example 65
5-(2-Chlorophenylacetylamino)-3-(4-ethoxyphenyl)-4-(4-pyridyl)-isoxazole

¹H-NMR (DMSO-d₆) δ: 11.02 (bs, 1H), 8.52 (dd, J=1.9 Hz, 4.6 Hz, 2H), 7.44-7.42 (m, 1H), 7.38-7.36 (m, 1H), 7.32-7.27 (m, 4H), 7.16 (dd, J=1.9 Hz, 4.6 Hz, 2H), 6.97 (d, J=8.9 Hz, 2H), 4.05 (q, J=6.9 Hz, 2H), 3.75 (s, 2H), 1.32 (t, J=6.9 Hz, 3H)

Mass, m/e: 433 (M⁺), 125 (base)

Example 66
3-(4-Ethoxyphenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.46 (dd, J=1.5 Hz, 4.4 Hz, 2H), 7.76 (bs, 1H), 7.30-7.17 (m, 7H), 6.97 (dd, J=1.5 Hz, 4.4 Hz, 2H), 6.83 (d, J=8.9 Hz, 2H), 4.02 (q, J=6.9 Hz, 2H), 2.99 (t, J=7.5 Hz, 2H), 2.74 (t, J=7.5 Hz, 2H), 1.40 (t, J=6.9 Hz, 3H)

Mass, m/e: 413 (M⁺), 91 (base)

Example 67
3-(2-Fluoro-4-methoxyphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole
a) 5-Amino-3-(2-fluoro-4-methoxyphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.49 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.38 (t, J=8.2 Hz, 1H), 7.00 (dd, 1.5 Hz, 4.6 Hz, 2H), 6.76 (dd, J=6.1 Hz, 8.2 Hz, 1H), 6.61 (dd, J=2.7 Hz, 11.9 Hz, 1H), 4.84 (bs, 2H), 3.82 (s, 3H)

Mass, m/e: 285 (M⁺), 63 (base)

b) 3-(2-Fluoro-4-methoxyphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole
Example 68
5-[(2-Chlorophenyl)acetylamino]-3-(2-fluoro-4-methoxyphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 11.19 (bs, 1H), 8.48 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.48-7.38 (m, 3H), 7.33-7.28 (m, 2H), 7.09 (dd, J=1.5 Hz, 4.6 Hz, 2H), 6.94 (s, 1H), 6.91-6.90 (m, 1H), 3.90 (s, 2H), 3.81 (s, 3H)

Mass, m/e: 437 (M⁺), 125 (base)

Example 69
3-(2-Fluoro-4-methoxyphenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.37 (d, J=5.78 Hz, 2H), 7.34 (t, J=8.0 Hz, 1H), 7.30-7.17 (m, 5H), 6.88 (dd, J=1.5 Hz, 4.2 Hz, 2H), 6.74 (dd, J=2.3 Hz, 8.48 Hz, 1H), 6.56 (dd, J=2.3 Hz, 11.5 Hz, 1H), 3.79 (s, 3H), 3.00 (t, J=7.3 Hz, 2H), 2.76 (t, J=7.3 Hz, 2H)

Mass, m/e: 417 (M⁺), 91 (base)

Example 70
3-(4-Fluoro-3-methoxyphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole
a) 5-Amino-3-(4-fluoro-3-methoxyphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.55 (dd, J=1.7 Hz, 4.4 Hz, 2H), 7.10-7.01 (m, 4H), 6.91-6.87 (m, 1H), 4.87 (s, 2H), 3.78 (s, 3H)

Mass, m/e: 285 (M⁺), 151 (base)

b) 3-(4-Fluoro-3-methoxyphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.50 (dd, J=1.7 Hz, 4.4 Hz, 2H), 7.53 (bs, 1H), 7.42-7.35 (m, 4H), 7.28-7.24 (m, 1H), 7.05-6.98 (m, 2H), 6.92 (dd, J=1.7 Hz, 4.4 Hz, 2H), 6.83-6.79 (m, 1H), 3.76 (bs, 2H), 3.75 (s, 3H)

Mass, m/e: 403 (M⁺), 91 (base)

Example 71
5-[(2-Chlorophenyl)acetylamino]-3-(2-fluoro-4-methoxyphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.51 (dd, J=1.5 Hz, 4.2 Hz, 2H), 7.63 (bs, 1H), 7.46-7.42 (m, 1H), 7.35-7.28 (m, 3H), 7.05-6.99 (m, 4H), 6.85-6.80 (m, 1H), 3.87 (s, 2H), 3.75 (s, 3H)

Mass, m/e: 437 (M⁺), 125 (base)

Example 72
3-(4-Fluoro-3-methoxyphenyl)-5-(phenylpropionylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.51 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.69 (bs, 1H), 7.32-7.16 (m, 5H), 7.05-7.01 (m, 2H), 6.98 (dd, J=1.5 Hz, 4.6 Hz, 2H), 6.84-6.79 (m, 1H), 3.74 (s, 3H), 3.00 (t, J=7.3 Hz, 2H), 2.75 (t, J=7.3 Hz, 2H)

Mass, m/e: 417 (M⁺), 91 (base)

Example 73
3-(2,3-Dimethoxyphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole
a) 5-Amino-3-(2,3-dimethoxyphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.43 (dd, J=1.7 Hz, 4.5 Hz, 2H), 7.09 (t, J=7.7 Hz, 1H), 7.02 (dd, J=1.7 Hz, 8.5 Hz, 1H), 6.99 (dd, J=1.7 Hz, 4.5 Hz, 2H), 6.92 (dd, J=1.7 Hz, 7.7 Hz, 1H), 4.91-4.85 (bs, 2H), 3.86 (s, 3H), 3.59 (s, 3H)

Mass, m/e: 297 (M⁺), 51 (base)

b) 3-(2,3-Dimethoxyphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.36 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.65-7.58 (bs, 1H), 7.43-7.33 (m, 3H), 7.29 (d, J=6.2 Hz, 2H), 7.09 (t, J=7.8 Hz, 1H), 7.01 (dd, J=1.5 Hz, 8.5 Hz, 1H), 6.90 (dd, J=1.5 Hz, 7.8 Hz, 1H), 6.80 (dd, J=1.5 Hz, 4.6 Hz, 2H), 3.83 (s, 3H), 3.79 (s, 2H), 3.48 (s, 3H)

Mass, m/e: 415 (M⁺), 91 (base)

Example 74
5-[(2-Chlorophenyl)acetylamino]-3-(2,3-dimethoxyphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.38 (d, J=5.8 Hz, 2H), 7.83-7.75 (bs, 1H), 7.50-7.27 (m, 4H), 7.09 (t, J=8.0 Hz, 1H), 7.01 (dd, J=1.5 Hz, 8.0 Hz, 1H), 6.94-6.89 (m, 3H), 3.90 (s, 2H), 3.83 (s, 3H), 3.49 (s, 3H)

Mass, m/e: 449 (M⁺), 125 (base)

Example 75
3-(2,3-Dimethoxyphenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.37 (dd, J=1.5 Hz, 4.6 Hz, 2H), 8.00-7.80 (bs, 1H), 7.32-7.17 (m, 5H), 7.10 (t, J=8.5 Hz, 1H), 7.02 (dd, J=1.5 Hz, 8.5 Hz, 1H), 6.91 (dd, J=1.5 Hz, 7.7 Hz, 1H), 6.89 (dd, J=1.5 Hz, 4.6 Hz, 2H), 3.83 (s, 3H), 3.50 (s, 3H), 3.01 (t, J=7.3 Hz, 2H), 2.76 (t, J=7.3 Hz, 2H)

Mass, m/e: 429 (M⁺), 91 (base)

Example 76
3-(3,4-Dimethoxyphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole
a) 5-Amino-3-(3,4-dimethoxyphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.55 (dd, J=1.5 Hz, 4.2 Hz, 2H), 7.10 (dd, J=1.5 Hz, 4.2 Hz, 2H), 6.99 (d, J=1.9 Hz, 1H), 6.93 (dd, J=1.9 Hz, 8.3 Hz, 1H), 6.82 (d, J=8.3 Hz, 1H), 4.80 (s, 2H), 3.89 (s, 3H), 3.76 (s, 3H)

Mass, m/e: 297 (M⁺), 164 (base)

b) 3-(3,4-Dimethoxyphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.50 (d, J=4.4 Hz, 6.2 Hz, 2H), 7.42-7.33 (m, 4H), 7.28-7.23 (m, 2H), 6.96-6.93 (m, 3H), 6.85 (dd, J=1.9 Hz, 8.3 Hz, 1H), 6.79 (d, J=8.3 Hz, 1H), 3.87 (s, 3H), 3.76 (s, 2H), 3.73 (s, 3H)

Mass, m/e: 415 (M⁺), 91 (base)

Example 77
5-[(2-Fluorophenyl)acetylamino]-3-(3,4-dimethoxyphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.51 (dd, J=4.4 Hz, 6.0 Hz, 2H), 7.54-7.48 (bs, 1H), 7.39-7.08 (m, 4H), 7.02 (dd, J=4.4 Hz, 6.0 Hz, 2H), 6.95 (d, J=2.1 Hz, 1H), 6.87 (dd, J=2.1 Hz, 8.2 Hz, 1H), 6.79 (d, J=8.2 Hz, 1H), 3.88 (s, 3H), 3.77 (s, 2H), 3.73 (s, 3H)

Mass, m/e: 433 (M⁺), 109 (base)

Example 78
5-[(2-Chlorophenyl)acetylamino]-3-(3,4-dimethoxyphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.51 (dd, J=4.6 Hz, 6.2 Hz, 2H), 7.56-7.51 (bs, 1H), 7.47-7.40 (m, 1H), 7.35-7.27 (m, 3H), 7.03 (dd, J=4.6 Hz, 6.2 Hz, 2H), 6.94 (d, J=1.9 Hz, 1H), 6.87 (dd, J=1.9 Hz, 8.3 Hz, 1H), 6.79 (d, J=8.3 Hz, 1H), 3.87 (s, 3H), 3.87 (s, 2H), 3.73 (s, 3H)

Mass, m/e: 449 (M⁺), 125 (base)

Example 79
3-(3,4-Dimethoxyphenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.53 (dd, J=1.6 Hz, 4.3 Hz, 2H), 7.33-7.14 (m, 5H), 7.02 (dd, J=1.6 Hz, 4.3 Hz, 2H), 6.94 (d, J=1.9 Hz, 1H), 6.86 (dd, J=1.9 Hz, 8.5 Hz, 1H), 6.79 (d, J=8.5 Hz, 1H), 3.88 (s, 3H), 3.73 (s, 3H), 3.00 (t, J=7.4 Hz, 2H), 2.75 (t, J=7.4 Hz, 2H)

Mass, m/e: 429 (M⁺), 91 (base)

Example 80
3-(2,6-Dimethoxyphenyl)-5-(Phenylacetylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.35 (dd, J=1.5 Hz, 4.4 Hz, 2H), 7.57 (bs, 1H), 7.39-7.28 (m, 6H), 6.79 (dd, J=1.5 Hz, 4.4 Hz, 2H), 6.54 (d, J=8.5 Hz, 2H), 3.77 (s, 2H), 3.58 (s, 6H)

Mass, m/e: 415 (M⁺), 91 (base)

Example 81
5-[2-(2-Chlorophenyl)acetylamino]-3-(2,6-dimethoxyphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 11.13 (bs, 1H), 8.39 (dd-like, 2H), 7.47-7.40 (m, 3H), 7.34-7.30 (m, 2H), 6.98 (dd, J=1.5 Hz, 4.6 Hz, 2H), 6.75 (d, J=8.5 Hz, 2H), 3.90 (s, 2H), 3.59 (s, 6H)

Mass, m/e: 450 (M⁺), 125 (base)

Example 82
3-(2,3-Methylenedioxyphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole
a) 5-Amino-3-(2,3-methylenedioxyphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.52 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.08 (dd, J=1.5 Hz, 4.6 Hz, 1H), 6.91-6.80 (m, 4H), 5.78 (s, 2H), 4.88 (bs, 2H)

Mass, m/e: 281 (M⁺), 63 (base)

b) 3-(2,3-Methylenedioxyphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.45 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.56 (bs, 1H), 7.41-7.36 (m, 3H), 7.28-7.26 (m, 2H), 6.90-6.81 (m, 5H), 5.70 (s, 2H), 3.77 (s, 2H)

Mass, m/e: 399 (M⁺), 91 (base)

Example 83
3-(2,3-Methylenedioxyphenyl)-5-[2-(2-chlorophenyl)acetylamino]-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.47 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.63 (bs, 1H), 7.45-7.43 (m, 1H), 7.35-7.29 (m, 3H), 6.99 (dd, J=1.5 Hz, 4.6 Hz, 2H), 6.89-6.81 (m, 3H), 5.71 (s, 2H), 3.88 (s, 2H)

Mass, m/e: 433 (M⁺), 125 (base)

Example 84
3-(3,4-Methylenedioxyphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole
a) 5-Amino-3-(3,4-methylenedioxyphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 8.41 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.18 (bs, 2H), 7.04 (dd, J=1.5 Hz, 4.6 Hz, 2H), 6.93 (d, J=8.1 Hz, 1H), 6.82 (d, J=1.5 Hz, 1H), 6.78 (dd, J=1.5 Hz, 8.1 Hz, 1H), 6.05 (s, 2H)

Mass, m/e: 281 (M⁺), 148 (base)

b) 3-(3,4-Methylenedioxyphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.49 (dd, J=1.5 Hz, 4.2 Hz, 2H), 7.62 (bs, 1H), 7.42-7.35 (m, 3H), 7.28-7.24 (m, 2H), 6.92 (dd, J=1.5 Hz, 4.2 Hz, 2H), 6.85 (d, J=1.5 Hz, 1H), 6.82 (dd, J=1.5 Hz, 8.1 Hz, 1H), 6.76 (d, J=8.1 Hz, 1H), 5.99 (s, 2H), 3.76 (s, 2H)

Mass, m/e: 399 (M⁺), 91 (base)

Example 85
5-[(2-Chlorophenyl)acetylamino]-3-(3,4-methylenedioxyphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 11.02 (bs, 1H), 8.52 (dd, J=1.4 Hz, 4.7 Hz, 2H), 7.43-7.38 (m, 1H), 7.37-7.33 (m, 1H), 7.32-7.25 (m, 2H), 7.16 (dd, J=1.4 Hz, 4.7 Hz, 2H), 6.95 (d, J=8.1 Hz, 1H), 6.89 (d, J=1.5 Hz, 1H), 6.81 (dd, J=1.5 Hz, 8.1 Hz, 1H), 6.06 (s, 2H), 3.84 (s, 2H)

Mass, m/e: 433 (M⁺), 125 (base)

Example 86
3-(3,4-Methylenedioxyphenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 10.78 (s, 1H), 8.51 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.32-7.17 (m, 5H), 7.08 (dd, J=1.5 Hz, 4.6 Hz, 2H), 6.97 (d, J=8.1 Hz, 1H), 6.90 (d, J=1.5 Hz, 1H), 6.81 (dd, J=1.5 Hz, 8.1 Hz, 1H), 2.86 (t, J=7.3 Hz, 2H), 2.67 (t, J=7.3 Hz, 2H)

Mass, m/e: 413 (M⁺), 91 (base)

Example 87
3-(3,4-Ethylenedioxyphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole
a) 5-Amino-3-(3,4-ethylenedioxyphenyl)-4-(4-pyridyl)isozazle

¹H-NMR (DMSO-d₆) δ: 8.44 (dd, J=1.6 Hz, 4.5 Hz, 2H), 7.18 (bs, 2H), 7.06 (dd, J=1.6 Hz, 4.5 Hz, 2H), 6.88 (d, J=8.3 Hz, 1H), 6.81 (d, J=2.1 Hz, 1H), 6.76 (dd, J=2.1 Hz, 8.3 Hz, 1H), 4.30-4.22 (m, 4H)

Mass, m/e: 295 (M⁺), 51 (base)

b) 3-(3,4-Ethylenedioxyphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.22 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.51 (bs, 1H), 7.40-7.32 (m, 3H), 7.25-7.23 (m, 2H), 6.91-6.90 (m, 3H), 6.79 (s, 2H), 4.28-4.21 (m, 4H), 3.74 (s, 2H)

Mass, m/e: 413 (M⁺), 91 (base)

Example 88
5-[(2-Chlorophenyl)acetylamino]-3-(3,4-ethylenedioxyphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 11.02 (bs, 1H), 8.54 (dd, J=1.7 Hz, 4.4 Hz, 2H), 7.44-7.41 (m, 1H), 7.37-7.27 (m, 3H), 7.18 (dd, J=1.7 Hz, 4.4 Hz, 2H), 6.90 (d, J=8.1 Hz, 1H), 6.85 (d, J=1.9 Hz, 1H), 6.80 (dd, J=1.9 Hz, 8.1 Hz, 1H), 4.28-4.23 (m, 4H), 3.85 (s, 2H)

Mass, m/e: 447 (M⁺), 125 (base)

Example 89
3-(3,4-Ethylenedioxyphenyl)-5-(3-phenylpropionylamino)-4-(pyridyl)-isoxazole

¹H-NMR (DMSO-d₆) δ: 10.76 (bs, 1H), 8.51 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.30-7.26 (m, 2H), 7.22-7.18 (m, 3H), 7.08 (dd, J=1.7 Hz, 4.6 Hz, 2H), 6.89 (d, J=8.1 Hz, 1H), 6.84 (d, J=1.9 Hz, 1H), 6.78 (dd, J=1.9 Hz, 8.1 Hz, 1H), 4.28-4.23 (m, 4H), 2.85 (t, J=7.5 Hz, 2H), 2.65 (t, J=7.5 Hz, 2H),

Mass, m/e: 427 (M⁺), 91 (base)

Example 90
5-(Phenylacetylamino)-4-(4-pyridyl)-3-(3-trifluoromethoxyphenyl)-isoxazole
a) 5-Amino-4-(4-pyridyl)-3-(3-trifluoromethoxyphenyl)isozazole

¹H-NMR (CDCl₃) δ: 8.56 (dd, J=1.5 Hz, 4.4 Hz, 2H), 7.53-7.28 (m, 4H), 7.05 (dd, J=1.5 Hz, 4.4 Hz, 2H), 4.89 (bs, 2H)

Mass, m/e: 321 (M⁺), 63 (base)

b) 5-(Phenylacetylamino)-4-(4-pyridyl)-3-(3-trifluoromethoxy-phenyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.50 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.52 (bs, 1H), 7.40-7.23 (m, 9H), 6.89 (dd, J=1.5 Hz, 4.6 Hz, 2H), 3.76 (s, 2H)

Mass, m/e: 439 (M⁺), 91 (base)

Example 91
5-[2-(2-Chlorophenyl)acetylamino]-4-(4-pyridyl)-3-(3-trifluoro-methoxyphenyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.51 (dd, J=1.5 Hz, 4.2 Hz, 2H), 7.65 (bs, 1H), 7.45-7.37 (m, 2H), 7.35-7.24 (m, 6H), 6.98 (dd, J=1.5 Hz, 4.2 Hz, 2H), 3.87 (s, 2H)

Mass, m/e: 473 (M⁺), 125 (base)

Example 92
5-(3-Phenylpropionylamino)-4-(4-pyridyl)-3-(3-trifluoromethoxy-phenyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.53 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.53 (bs, 1H), 7.43-7.39 (m, 2H), 7.32-7.17 (m, 7H), 6.97 (dd, J=1.5 Hz, 4.6 Hz, 2H), 3.01 (t, J=7.3 Hz, 2H), 2.75 (t, J=7.3 Hz, 2H)

Mass, m/e: 453 (M⁺), 91 (base)

Example 93
5-(Phenylacetylamino)-4-(4-pyridyl)-3-(4-trifluoromethoxy-phenyl)isoxazole
a) 5-Amino-4-(4-pyridyl)-3-(4-trifluoromethoxyphenyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.57 (dd, J=1.5 Hz, 4.5 Hz, 2H), 7.53-7.40 (m, 2H), 7.19-7.02 (m, 4H), 4.85 (bs, 2H)

Mass, m/e: 321 (M⁺, base)

b) 5-(Phenylacetylamino)-4-(4-pyridyl)-3-(4-trifluoro-methoxyphenyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.50 (dd, J=1.5 Hz, 4.2 Hz, 2H), 7.59 (bs, 1H), 7.42-7.18 (m, 9H), 6.90 (dd, J=1.5 Hz, 4.2 Hz, 2H), 3.75 (s, 2H)

Mass, m/e: 439 (M⁺), 91 (base)

Example 94
5-[2-(2-Chlorophenyl)acetylamino]-4-(4-pyridyl)-3-(4-trifluoro-methoxyphenyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.52 (dd, J=1.5 Hz, 4.2 Hz, 2H), 7.56 (bs, 1H), 7.46-7.40 (m, 3H), 7.34-7.29 (m, 3H), 7.21-7.19 (m, 2H), 6.99 (dd, J=1.5 Hz, 4.2 Hz, 2H), 3.87 (s, 2H)

Mass, m/e: 473 (M⁺), 125 (base)

Example 95
3-(2-Methylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole
a) 5-Amino-3-(2-methylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.42 (dd, J=1.6 Hz, 4.5 Hz, 2H), 7.38-7.32 (m, 1H), 7.30-7.21 (m, 3H), 6.89 (dd, J=1.6 Hz, 4.5 Hz, 2H), 4.95 (s, 2H), 2.10 (s, 3H)

Mass, m/e: 251 (M⁺), 65 (base)

b) 3-(2-Methylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.36 (dd, J=4.6 Hz, 6.2 Hz, 2H), 7.66-7.61 (bs, 1H), 7.45-7.28 (m, 6H), 7.24-7.17 (m, 3H), 6.71 (dd, J=4.6 Hz, 6.2 Hz, 2H), 3.81 (s, 2H), 2.03 (s, 3H)

Mass, m/e: 369 (M⁺), 91 (base)

Example 96
5-[(2-Fluorophenyl)acetylamino]-3-(2-methylphenyl)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.37 (dd, J=4.5 Hz, 6.2 Hz, 2H), 7.90-7.80 (bs, 1H), 7.39-7.29 (m, 4H), 7.25-7.10 (m, 4H), 6.80 (dd, J=4.5 Hz, 6.2 Hz, 2H), 3.82 (s, 2H), 2.04 (s, 3H)

Mass, m/e: 387 (M⁺), 109 (base)

Example 97
5-[(2-Chlorophenyl)acetylamino]-3-(2-methylphenyl)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.38 (dd, J=4.6 Hz, 6.0 Hz, 2H), 7.67-7.62 (bs, 1H), 7.49-7.44 (m, 1H), 7.40-7.30 (m, 4H), 7.24-7.18 (m, 3H), 6.82 (dd, J=4.6 Hz, 6.0 Hz, 2H), 3.92 (s, 2H), 2.04 (s, 3H)

Mass, m/e: 403 (M⁺), 125 (base)

Example 98
3-(2-Methylphenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.38 (dd, J=1.6 Hz, 4.6 Hz, 2H), 7.71-7.63 (bs, 1H), 7.38-7.18 (m, 9H), 6.79 (dd, J=1.6 Hz, 4.6 Hz, 2H), 3.03 (t, J=7.3 Hz, 2H), 2.80 (t, J=7.3 Hz, 2H), 2.05 (s, 3H)

Mass, m/e: 383 (M⁺), 91 (base)

Example 99
3-(3-Methylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole
a) 5-Amino-3-(3-methylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.47 (dd, J=1.5 Hz, 4.4 Hz, 2H), 7.27 (s, 1H), 7.22 (d, J=5.0 Hz, 2H), 7.14-7.11 (m, 1H), 7.03 (dd, J=1.5 Hz, 4.4 Hz, 2H), 5.06 (bs, 2H), 2.31 (s, 3H)

Mass, m/e: 251 (M⁺), 91 (base)

b) 3-(3-Methylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.44 (dd, J=1.7 Hz, 4.6 Hz, 2H), 7.68 (bs, 1H), 7.40-7.17 (m, 8H), 7.04 (d, J=6.9 Hz, 1H), 6.88 (dd, J=1.7 Hz, 4.6 Hz, 2H), 3.75 (s, 2H), 2.29 (s, 3H)

Mass, m/e: 369 (M⁺), 91 (base)

Example 100
5-[(2-Chlorophenyl)acetylamino]-3-(3-methylphenyl)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.46 (dd, J=1.7 Hz, 4.6 Hz, 2H), 7.80 (bs, 1H), 7.44-7.41 (m, 1H), 7.34-7.18 (m, 6H), 7.06 (d, J=6.9 Hz, 1H), 6.98 (dd, J=1.7 Hz, 4.6 Hz, 2H), 3.87 (s, 2H), 2.30 (s, 3H)

Mass, m/e: 403 (M⁺), 125 (base)

Example 101
5-[(2-Fluorophenyl)acetylamino]-3-(3-methylphenyl)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.45 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.96 (bs, 1H), 7.34-7.18 (m, 8H), 6.96 (dd, J=1.5 Hz, 4.6 Hz, 2H), 3.77 (s, 2H), 2.30 (s, 3H)

Mass, m/e: 387 (M⁺), 109 (base)

Example 102
3-(3-Methylphenyl)-5-[(1-phenyl)cyclopropylcarboxyamino]-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.48 (dd, J=1.7 Hz, 4.6 Hz, 2H), 7.46-7.37 (m, 6H), 7.23-7.17 (m, 3H), 7.04 (d, J=6.9 Hz, 1H), 6.87 (dd, J=1.7 Hz, 4.6 Hz, 2H), 2.29 (s, 3H), 1.69 (q, J=3.8 Hz, 2H), 1.23 (q, J=3.8 Hz, 2H)

Mass, m/e: 395 (M⁺), 117 (base)

Example 103
3-(3-Methylphenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.39 (dd, J=1.5 Hz, 4.6 Hz, 2H), 8.34 (bs, 1H), 7.30-7.16 (m, 8H), 7.03 (d, J=7.3 Hz, 1H), 6.94 (dd, J=1.5 Hz, 4.6 Hz, 2H), 3.00 (t, J=7.3 Hz, 2H), 2.75 (t, J=7.3 Hz, 2H), 2.29 (s, 3H)

Mass, m/e: 383 (M⁺), 91 (base)

Example 104
5-[(2-Chlorophenyl)propionylamino]-3-(3-methylphenyl)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.46 (d, J=5.9 Hz, 2H), 7.95 (bs, 1H), 7.35-7.31 (m, 1H), 7.25-7.15 (m, 6H), 7.06 (d, J=6.8 Hz, 1H), 6.99 (d, J=5.9 Hz, 2H), 3.11 (t, J=7.4 Hz, 2H), 2.77 (t, J=7.4 Hz, 2H), 2.30 (s, 3H)

Mass, m/e: 417 (M⁺), 251 (base)

Example 105
5-[(3-Chlorophenyl)propionylamino]-3-(3-methylphenyl)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.43 (d, J=5.9 Hz, 2H), 8.18 (bs, 1H), 7.23-7.18 (m, 6H), 7.07-7.04 (m, 2H), 6.97 (d, J=5.9 Hz, 2H), 2.98 (t, J=7.4 Hz, 2H), 2.75 (t, J=7.4 Hz, 2H), 2.30 (s, 3H)

Mass, m/e: 417 (M⁺), 251 (base)

Example 106
3-(3-Methylphenyl)-5-[(2-methylphenyl)propionylamino]-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.44 (d, J=6.0 Hz, 2H), 8.03 (bs, 1H), 7.24-7.18 (m, 3H), 7.15-7.10 (m, 4H), 7.05 (d, J=7.03 Hz, 1H), 6.97 (d, J=6.0 Hz, 2H), 2.99 (t, J=7.6 Hz, 2H), 2.71 (t, J=7.6 Hz, 2H), 2.30 (s, 3H), 2.29 (s, 3H)

Mass, m/e: 397 (M⁺), 105 (base)

Example 107
3-(3-Methylphenyl)-5-[(3-methylphenyl)propionylamino]-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.45 (dd, J=1.4 Hz, 4.4 Hz, 2H), 7.79 (bs, 1H), 7.24-7.18 (m, 3H), 7.10-7.04 (m, 5H), 6.95 (dd, J=1.4 Hz, 4.4 Hz, 2H), 2.96 (t, J=7.3 Hz, 2H), 2.73 (t, J=7.3 Hz, 2H), 2.32 (s, 3H), 2.30 (s, 3H)

Mass, m/e: 397 (M⁺), 105 (base)

Example 108
3-(4-Methylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole
a) 5-Amino-3-(4-methylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 8.40 (dd, J=1.6 Hz, 4.5 Hz, 2H), 7.21 (s, 4H), 7.20 (bs, 1H), 7.01 (dd, J=1.6 Hz, 4.5 Hz, 2H), 2.33 (bs, 2H)

Mass, m/e: 251 (M⁺), 118 (base)

b) 3-(4-Methylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.46 (dd, J=1.5 Hz, 4.5 Hz, 2H), 7.67 (bs, 1H), 7.42-7.35 (m, 3H), 7.28-7.22 (m, 4H), 7.15 (d, J=7.7 Hz, 2H), 6.90 (dd, J=1.5 Hz, 4.4 Hz, 2H), 3.76 (s, 2H), 2.36 (s, 3H)

Mass, m/e: 369 (M⁺), 91 (base)

Example 109
5-[(2-Chlorophenyl)acetylamino]-3-(4-methylphenyl)-4-(4-pyridyl)-isoxazole

¹H-NMR (DMSO-d₆) δ: 11.04 (bs, 1H), 8.50 (dd, J=1.5 Hz, 4.4 Hz, 2H), 7.44-7.34 (m, 2H), 7.31-7.27 (m, 2H), 7.24 (s, 4H), 7.13 (dd, J=1.5 Hz, 4.4 Hz, 2H), 3.85 (s, 2H), 2.33 (s, 3H)

Mass, m/e: 403 (M⁺), 125 (base)

Example 110
3-(4-Methylphenyl)-5-(phenylpropionylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.45 (dd, J=1.7 Hz, 4.6 Hz, 2H), 7.82 (bs, 1H), 7.30-7.13 (m, 9H), 6.95 (dd, J=1.7 Hz, 4.6 Hz, 2H), 3.00 (t, J=7.3 Hz, 2H), 2.75 (t, J=7.3 Hz, 2H), 2.35 (s, 3H)

Mass, m/e: 383 (M⁺), 91 (base)

Example 111
3-(4-Ethylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole
a) 5-Amino-3-(4-ethylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.52 (dd, J=1.7 Hz, 4.4 Hz, 2H), 7.33 (d, J=8.5 Hz, 2H), 7.19 (d, J=8.5 Hz, 2H), 7.07 (dd, J=1.7 Hz, 4.4 Hz, 2H), 4.83 (bs, 2H), 2.67 (q, J=7.6 Hz, 2H), 1.24 (t, J=7.6 Hz, 3H)

Mass, m/e: 265 (M⁺), 132 (base)

b) 3-(4-Ethylphenyl)-5-(Phenylacetylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.46 (dd, J=1.5 Hz, 4.4 Hz, 2H), 7.57 (bs, 1H), 7.40-7.33 (m, 3H), 7.27-7.24 (m, 4H), 7.16 (d, J=8.1 Hz, 2H), 6.90 (dd, J=1.5 Hz, 4.4 Hz, 2H), 3.75 (s, 2H), 2.65 (q, J=7.5 Hz, 2H), 1.22 (t, J=7.5 Hz, 3H)

Mass, m/e: 383 (M⁺), 91 (base)

Example 112
5-(2-Chlorophenylacetylamino)-3-(4-ethylphenyl)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.47 (dd, J=1.7 Hz, 4.4 Hz, 2H), 7.71 (bs, 1H), 7.44-7.41 (m, 1H), 7.33-7.26 (m, 5H), 7.16 (d, J=8.1 Hz, 2H), 6.99 (dd, J=1.7 Hz, 4.4 Hz, 2H), 3.84 (s, 2H), 2.65 (q, J=7.3 Hz, 2H), 1.22 (t, J=7.3 Hz, 3H)

Mass, m/e: 417 (M⁺), 125 (base)

Example 113
3-(4-Ethylphenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.45 (dd, J=1.5 Hz, 4.4 Hz, 2H), 7.84 (bs, 1H), 7.30-7.15 (m, 9H), 6.96 (dd, J=1.5 Hz, 4.4 Hz, 2H), 3.00 (t, J=7.3 Hz, 2H), 2.75 (t, J=7.3 Hz, 2H), 2.65 (q, J=7.7 Hz, 2H), 1.22 (t, J=7.7 Hz, 3H)

Mass, m/e: 397 (M⁺), 91 (base)

Example 114
3-(2-Fluoro-5-methylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole
a) 5-Amino-3-(2-fluoro-5-methylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.43 (dd, J=1.7 Hz, 4.6 Hz, 2H), 7.28 (dd, J=1.9 Hz, 6.5 Hz, 1H), 7.23-7.20 (m, 1H), 6.98 (dd, J=1.7 Hz, 4.6 Hz, 2H), 6.93 (t, J=8.8 Hz, 1H), 5.11 (bs, 2H), 2.33 (s, 3H)

Mass, m/e: 269 (M⁺), 63 (base)

b) 3-(2-Fluoro-5-methylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.41 (dd, J=1.9 Hz, 4.6 Hz, 2H), 7.57 (bs, 1H), 7.43-7.35 (m, 3H), 7.29-7.27 (m, 3H), 7.24-7.20 (m, 1H), 6.89 (dd, J=8.4 Hz, 9.2 Hz, 1H), 6.80 (dd, J=1.5 Hz, 4.6 Hz, 2H), 3.77 (s, 2H), 2.33 (s, 3H)

Mass, m/e: 387 (M⁺), 91 (base)

Example 115
3-(2-Fluoro-5-methylphenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.36 (d, J=5.9 Hz, 2H), 8.25 (bs, 1H), 7.30-7.17 (m, 7H), 6.90 (d, J=9.3 Hz, 1H), 6.87 (d, J=5.9 Hz, 2H), 3.01 (t, J=7.3 Hz, 2H), 2.76 (t, J=7.3 Hz, 2H), 2.33 (s, 3H)

Mass, m/e: 401 (M⁺), 91 (base)

Example 116
5-[(2-Chlorophenyl)propionylamino]3-(2-fluoro-5-methylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.41 (d, J=5.9 Hz, 2H), 8.03 (bs, 1H), 7.35-7.32 (m, 1H), 7.28 (dd, J=1.7 Hz, 6.3 Hz, 1H), 7.25-7.17 (m, 4H), 6.93-6.88 (m, 3H), 3.12 (t, J=7.6 Hz, 2H), 2.78 (t, J=7.6 Hz, 2H), 2.34 (s, 3H)

Mass, m/e: 435 (M⁺), 269 (base)

Example 117
5-[(3-Chlorophenyl)propionylamino]-3-(2-fluoro-5-methylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.41 (d, J=5.8 Hz, 2H), 8.07 (bs, 1H), 7.28 (dd, J=1.7 Hz, 6.2 Hz, 1H), 7.23-7.19 (m, 4H), 7.08-7.06 (m, 1H), 6.92-6.88 (m, 3H), 2.99 (t, J=7.4 Hz, 2H), 2.76 (t, J=7.4 Hz, 2H), 2.33 (s, 3H)

Mass, m/e: 435 (M⁺), 269 (base)

Example 118
3-(2-Fluoro-5-methylphenyl)-5-[(2-methylphenyl)propionylamino]-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.49 (d, J=6.0 Hz, 2H), 7.70 (bs, 1H), 7.27 (d, J=7.4 Hz, 1H), 7.16-7.10 (m, 4H), 7.08-7.04 (m, 1H), 6.98 (d, J=6.0 Hz, 2H), 6.95 (t, J=8.6 Hz, 1H), 2.99 (t, J=7.6 Hz, 2H), 2.71 (t, J=7.6 Hz, 2H), 2.29 (s, 3H), 2.22 (d, J=1.6 Hz, 3H)

Mass, m/e: 415 (M⁺), 105 (base)

Example 119
3-(2-Fluoro-5-methylphenyl)-5-[(3-methylphenyl)propionylamino]-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.39 (d, J=6.1 Hz, 2H), 7.99 (bs, 1H), 7.28 (dd, J=2.1 Hz, 6.8 Hz, 1H), 7.23-7.20 (m, 1H), 7.11-7.06 (m, 4H), 6.91 (d, J=9.3 Hz, 1H), 6.87 (d, J=6.1 Hz, 2H), 2.97 (t, J=7.4 Hz, 2H), 2.74 (t, J=7.4 Hz, 2H), 2.33 (s, 3H), 2.31 (s, 3H)

Mass, m/e: 415 (M⁺), 105 (base)

Example 120
3-(3-Fluoro-4-methylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole
a) 5-Amino-3-(3-fluoro-4-methylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.51 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.16 (t, J=7.7 Hz, 1H), 7.09 (dd, J=1.9 Hz, 10.4 Hz, 1H), 7.06-7.04 (m, 3H), 4.96 (bs, 2H), 2.28 (s, 3H)

Mass, m/e: 269 (M⁺), 63 (base)

b) 3-(3-Fluoro-4-methylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.46 (dd, J=1.7 Hz, 4.6 Hz, 2H), 7.71 (bs, 1H), 7.40-7.33 (m, 3H), 7.26-7.24 (m, 2H), 7.13 (t, J=7.7 Hz, 1H), 7.04 (dd, J=1.9 Hz, 10 Hz, 1H), 6.98 (dd, J=1.9 Hz, 8.1 Hz, 1H), 6.89 (dd, J=1.7 Hz, 4.6 Hz, 2H), 3.75 (s, 2H), 2.27 (d, J=1.9 Hz, 3H)

Mass, m/e: 387 (M⁺), 91 (base)

Example 121
5-[(2-Chlorophenyl)acetylamino]-3-(3-fluoro-4-methylphenyl)-4-(4-pyridyl)isoxazole

H-NMR (DMSO-d₆) δ: 11.1 (bs, 1H), 8.53 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.44-7.42 (m, 1H), 7.38-7.34 (m, 2H), 7.32-7.28 (m, 2H), 7.17 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.15 (dd, J=1.5 Hz, 8.8 Hz, 1H), 7.08 (dd, J=1.9 Hz, 8.0 Hz, 1H), 3.86 (s, 2H), 2.26 (d, J=1.5 Hz, 3H)

Mass, m/e: 421 (M⁺), 125 (base)

Example 122
3-(3-Fluoro-4-methylphenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.46 (dd, J=1.7 Hz, 4.6 Hz, 2H), 7.96 (bs, 1H), 7.31-7.27 (m, 2H), 7.24-7.17 (m, 3H), 7.14 (t, J=8.0 Hz, 1H), 7.04 (dd, J=1.5 Hz, 10 Hz, 1H), 6.98 (dd, J=1.5 Hz, 7.7 Hz, 1H), 6.96 (dd, J=1.7 Hz, 4.6 Hz, 2H), 3.00 (t, J=7.32 Hz, 2H), 2.75 (t, J=7.32 Hz, 2H), 2.27 (d, J=1.5 Hz, 3H)

Mass, m/e: 401 (M⁺), 91 (base)

Example 123
3-(4-Fluoro-3-methylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole
a) 5-Amino-3-(4-fluoro-3-methylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.54 (dd, J=1.7 Hz, 4.4 Hz, 2H), 7.34-7.30 (m, 1H), 7.16-7.12 (m, 1H), 7.05 (dd, J=1.7 Hz, 4.4 Hz, 2H), 6.98 (t, J=9.1 Hz, 1H), 4.84 (s, 2H), 2.24 (d, J=1.9 Hz, 3H)

Mass, m/e: 269 (M⁺), 63 (base)

b) 3-(4-Fluoro-3-methylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.45 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.60 (bs, 1H), 7.42-7.33 (m, 3H), 7.29-7.22 (m, 3H), 7.08-7.03 (m, 1H), 6.94 (t, J=9.1 Hz, 1H), 6.89 (dd, J=1.5 Hz, 4.6 Hz, 2H), 3.76 (s, 2H), 2.22 (d, J=1.9 Hz, 3H)

Mass, m/e: 387 (M⁺), 91 (base)

Example 124
5-[(2-Chlorophenyl)acetylamino]-3-(4-fluoro-3-methylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.49 (dd, J=1.7 Hz, 4.4 Hz, 2H), 7.63 (bs, 1H), 7.45-7.42 (m, 1H), 7.35-7.26 (m, 4H), 7.09-7.05 (m, 1H), 6.98 (dd, J=1.7 Hz, 4.4 Hz, 2H), 6.95 (t, J=8.9 Hz, 1H), 3.87 (s, 2H), 2.22 (d, J=1.9 Hz, 3H)

Mass, m/e: 421 (M⁺), 125 (base)

Example 125
3-(4-Fluoro-3-methylphenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.49 (d, J=5.8 Hz, 2H), 7.69 (s, 1H), 7.32-7.16 (m, 5H), 7.09-7.04 (m, 1H), 6.98-6.94 (m, 3H), 3.01 (t, J=7.4 Hz, 2H), 2.77 (t, J=7.4 Hz, 2H), 2.23 (s, 3H)

Mass, m/e: 401 (M⁺), 91 (base)

Example 126
5-[(2-Chlorophenyl)propionylamino]-3-(4-fluoro-5-methylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.49 (dd, J=1.5 Hz, 4.4 Hz, 2H), 7.79 (bs, 1H), 7.35-7.32 (m, 1H), 7.28 (dd, J=1.7 Hz, 7.2 Hz, 1H), 7.24-7.17 (m, 3H), 7.08-7.04 (m, 1H), 6.99 (dd, J=1.5 Hz, 4.4 Hz, 2H), 6.95 (t, J=8.9 Hz, 1H), 3.11 (t, J=7.4 Hz, 2H), 2.76 (t, J=7.4 Hz, 2H), 2.22 (d, J=1.7 Hz, 3H)

Mass, m/e: 435 (M⁺), 269 (base)

Example 127
5-[(3-Chlorophenyl)propionylamino]-3-(4-fluoro-5-methylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.52 (d, J=5.8 Hz, 2H), 7.53 (bs, 1H), 7.29-7.27 (m, 1H), 7.21-7.18 (m, 3H), 7.09-7.05 (m, 2H), 6.98 (d, J=5.8 Hz, 2H), 6.95 (m, 1H), 2.98 (t, J=7.4 Hz, 2H), 2.74 (t, J=7.4 Hz, 2H), 2.22 (d, J=1.7 Hz, 3H)

Mass, m/e: 435 (M⁺), 269 (base)

Example 128
3-(4-Fluoro-5-methylphenyl)-5-[(2-methylphenyl)propionylamino]-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.39 (d, J=6.2 Hz, 2H), 8.17 (bs, 1H), 7.29 (dd, J=2.0 Hz, 6.6 Hz, 1H), 7.23-7.21 (m, 1H), 7.14-7.12 (m, 4H), 6.92-6.88 (m, 3H), 3.00 (t, J=7.8 Hz, 2H), 2.72 (t, J=7.8 Hz, 2H), 2.33 (s, 3H), 2.29 (s, 3H)

Mass, m/e: 415 (M⁺), 105 (base)

Example 129
3-(4-Fluoro-5-methylphenyl)-5-[(3-methylphenyl)propionylamino]-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.48 (dd, J=1.3 Hz, 4.7 Hz, 2H), 7.66 (bs, 1H), 7.27 (dd, J=1.7 Hz, 7.2 Hz, 1H), 7.11-7.04 (m, 5H), 6.97-6.92 (m, 3H), 2.96 (t, J=7.4 Hz, 2H), 2.72 (t, J=7.4 Hz, 2H), 2.32 (s, 3H), 2.22 (d, J=1.7 Hz, 3H)

Mass, m/e: 415 (M⁺), 105 (base)

Example 130
3-(4-Chloro-3-methylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole
a) 5-Amino-3-(4-chloro-3-methylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.53 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.35 (d, J=1.9 Hz, 1H), 7.31 (d, J=8.1 Hz, 1H), 7.10 (dd, J=2.3 Hz, 8.5 Hz, 1H), 7.05 (dd, J=1.5 Hz, 4.6 Hz, 2H), 4.87 (bs, 2H), 2.34 (s, 3H)

Mass, m/e: 285 (M⁺), 63 (base)

b) 3-(4-Chloro-3-methylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.48 (dd, J=1.5 Hz, 4.2 Hz, 2H), 7.55 (bs, 1H), 7.42-7.25 (m, 7H), 7.02 (dd, J=1.9 Hz, 8.1 Hz, 1H), 6.89 (dd, J=1.5 Hz, 4.2 Hz, 2H), 3.76 (s, 2H), 2.32 (s, 3H)

Mass, m/e: 403 (M⁺), 91 (base)

Example 131
3-(4-Chloro-3-methylphenyl)-5-[(2-chlorophenyl)acetylamino]-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.50 (dd, J=1.5 Hz, 4.4 Hz, 2H), 7.69 (bs, 1H), 7.46-7.41 (m, 1H), 7.35-7.26 (m, 5H), 7.03 (dd, J=1.9 Hz, 8.5 Hz, 1H), 6.98 (dd, J=1.5 Hz, 4.4 Hz, 2H), 3.87 (s, 2H), 2.30 (s, 3H)

Mass, m/e: 437 (M⁺), 125 (base)

Example 132
3-(4-Chloro-3-methylphenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.48 (dd, J=1.6 Hz, 4.5 Hz, 2H), 7.78 (bs, 1H), 7.32-7.16 (m, 7H), 7.02 (dd, J=2.1 Hz, 8.3 Hz, 1H), 6.95 (dd, J=1.6 Hz, 4.5 Hz, 2H), 3.01 (t, J=7.3 Hz, 2H), 2.75 (t, J=7.3 Hz, 2H), 2.34 (s, 3H)

Mass, m/e: 417 (M⁺), 91 (base)

Example 133
3-(4-Methoxy-3-methylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole
a) 5-Amino-3-(4-methoxy-3-methylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.52 (dd, J=1.7 Hz, 4.6 Hz, 2H), 7.25 (m, 1H), 7.15 (dd, J=2.3 Hz, 8.5 Hz, 1H), 7.07 (dd, J=1.7 Hz, 4.6 Hz, 2H), 6.77 (d, J=8.5 Hz, 1H), 4.81 (bs, 2H), 3.83 (s, 3H), 2.17 (s, 3H)

Mass, m/e: 281 (M⁺), 148 (base)

b) 3-(4-Methoxy-3-methylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.46 (dd, J=1.6 Hz, 4.5 Hz, 2H), 7.57 (bs, 1H), 7.41-7.32 (m, 3H), 7.28-7.23 (m, 2H), 7.22-7.19 (m, 1H), 7.06 (dd, J=1.9 Hz, 8.1 Hz, 1H), 6.91 (dd, J=1.6 Hz, 4.5 Hz, 2H), 6.73 (d, J=8.5 Hz, 1H), 3.82 (s, 3H), 3.75 (s, 2H), 2.14 (s, 3H)

Mass, m/e: 399 (M⁺), 91 (base)

Example 134
5-[(2-Chlorophenyl)acetylamino]-3-(4-methoxy-3-methylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.48 (dd, J=1.5 Hz, 4.4 Hz, 2H), 7.65 (bs, 1H), 7.45-7.41 (m, 1H), 7.34-7.27 (m, 3H), 7.23-7.21 (m, 1H), 7.08 (dd, J=2.3 Hz, 8.7 Hz, 1H), 7.01 (dd, J=1.5 Hz, 4.4 Hz, 2H), 6.74 (d, J=8.7 Hz, 1H), 3.87 (s, 2H), 3.82 (s, 3H), 2.15 (s, 3H)

Mass, m/e: 433 (M⁺), 125 (base)

Example 135
3-(4-Methoxy-3-methylphenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.46 (d, J=5.9 Hz, 2H), 7.74 (bs, 1H), 7.30-7.17 (m, 6H), 7.06 (dd, J=1.9 Hz, 8.4 Hz, 1H), 6.97 (d, J=5.9 Hz, 2H), 6.73 (d, J=8.4 Hz, 1H), 3.82 (s, 3H), 3.00 (t, J=7.3 Hz, 2H), 2.73 (t, J=7.3 Hz, 2H), 2.14 (s, 3H)

Mass, m/e: 413 (M⁺), 91 (base)

Example 136
3-(2,3-Dimethylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole
a) 5-Amino-3-(2,3-dimethylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.40 (dd, J=1.7 Hz, 4.4 Hz, 2H), 7.24-7.22 (m, 1H), 7.16-7.13 (m, 2H), 6.88 (dd, J=1.7 Hz, 4.4 Hz, 2H), 4.98 (bs, 2H), 2.26 (s, 3H), 1.99 (s, 3H)

Mass, m/e: 265 (M⁺), 77 (base)

b) 3-(2,3-Dimethylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.34 (dd, J=1.5 Hz, 4.4 Hz, 2H), 7.62 (bs, 1H), 7.43-7.30 (m, 5H), 7.22 (d, J=7.3 Hz, 1H), 7.12 (t, J=7.3 Hz, 1H), 7.06 (d, J=6.9 Hz, 1H), 6.70 (dd, J=1.5 Hz, 4.4 Hz, 2H), 3.80 (s, 2H), 2.23 (s, 3H), 1.89 (s, 3H)

Mass, m/e: 383 (M⁺), 91 (base)

Example 137
5-[(2-Chlorophenyl)acetylamino]-3-(2,3-dimethylphenyl)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.35 (dd, J=1.5 Hz, 4.6 Hz, 2H), 8.01 (bs, 1H), 7.46-7.43 (m, 1H), 7.37-7.35 (m, 1H), 7.33-7.29 (m, 2H), 7.23 (d, J=7.5 Hz, 1H), 7.12 (t, J=7.5 Hz, 1H), 7.07 (d, J=6.5 Hz, 1H), 6.81 (dd, J=1.5 Hz, 4.6 Hz, 2H), 3.91 (s, 2H), 2.23 (s, 3H), 1.90 (s, 3H)

Mass, m/e: 417 (M⁺), 125 (base)

Example 138
3-(2,3-Dimethylphenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.34 (d, J=5.9 Hz, 2H), 8.00 (bs, 1H), 7.31-7.19 (m, 6H), 7.12 (t, J=7.3 Hz, 1H), 7.06 (d, J=6.9 Hz, 1H), 6.78 (d, J=5.9 Hz, 2H), 3.02 (t, J=7.3 Hz, 2H), 2.79 (t, J=7.3 Hz, 2H), 2.23 (s, 3H), 1.91 (s, 3H)

Mass, m/e: 397 (M⁺), 91 (base)

Example 139
5-[(2-Chlorophenyl)propionylamino]-3-(2,3-dimethylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.35 (dd, J=1.5 Hz, 4.6 Hz, 2H), 8.19 (bs, 1H), 7.35-7.31 (m, 1H), 7.27-7.09 (m, 6H), 6.82 (dd, J=1.5 Hz, 4.6 Hz, 2H), 3.12 (t, J=7.6 Hz, 2H), 2.80 (t, J=7.6 Hz, 2H), 2.23 (s, 3H), 1.91 (s, 3H)

Mass, m/e: 431 (M⁺), 265 (base)

Example 140
5-[(3-Chlorophenyl)propionylamino]-3-(2,3-dimethylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.37 (d, J=6.0 Hz, 2H), 7.92 (bs, 1H), 7.22-7.20 (m, 4H), 7.13 (t, J=7.4 Hz, 1H), 7.10-7.06 (m, 2H), 6.81 (d, J=6.0 Hz, 2H), 3.00 (t, J=7.4 Hz, 2H), 2.78 (t, J=7.4 Hz, 2H), 2.24 (s, 3H), 1.92 (s, 3H)

Mass, m/e: 431 (M⁺), 265 (base)

Example 141
3-(2,4-Dimethylphenyl)-5-[(2-methylphenyl)propionylamino]-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.37 (d, J=6.0 Hz, 2H), 7.82 (bs, 1H), 7.24 (d, J=8.6 Hz, 2H), 7.15-7.07 (m, 5H), 6.81 (d, J=6.0 Hz, 2H), 3.02 (t, J=7.6 Hz, 2H), 2.75 (t, J=7.6 Hz, 2H), 2.30 (s, 3H), 2.24 (s, 3H), 1.92 (s, 3H)

Mass, m/e: 411 (M⁺), 105 (base)

Example 142
3-(2,4-Dimethylphenyl)-5-[(3-methylphenyl)propionylamino]-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.35 (dd, J=1.7 Hz, 4.6 Hz, 2H), 7.84 (bs, 1H), 7.23 (d, J=9.7 Hz, 1H), 7.15-7.06 (m, 6H), 6.78 (dd, J=1.7 Hz, 4.6 Hz, 2H), 2.98 (t, J=7.2 Hz, 2H), 2.76 (t, J=7.2 Hz, 2H), 2.32 (s, 3H), 2.23 (s, 3H), 1.91 (s, 3H)

Mass, m/e: 411 (M⁺), 105 (base)

Example 143
3-(2,5-Dimethylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole
a) 5-Amino-3-(2,5-dimethylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.42 (dd, J=1.7 Hz, 4.4 Hz, 2H), 7.18-7.08 (m, 3H), 6.90 (dd, J=1.7 Hz, 4.4 Hz, 2H), 4.93 (bs, 2H), 2.31 (s, 3H), 2.01 (s, 3H)

Mass, m/e: 266 (M⁺), 77 (base)

b) 3-(2,5-Dimethylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.35 (dd, J=1.7 Hz, 4.6 Hz, 2H), 7.68 (bs, 1H), 7.43-7.37 (m, 3H), 7.31-7.30 (m, 2H), 7.14 (d, J=8.0 Hz, 1H), 7.08-7.04 (m, 2H), 6.71 (dd, J=1.7 Hz, 4.6 Hz, 2H), 3.80 (s, 2H), 2.28 (s, 3H), 1.92 (s, 3H)

Mass, m/e: 383 (M⁺), 91 (base)

Example 144
5-[(2-Chlorophenyl)acetylamino]-3-(2,5-dimethylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.38 (d, J=5.9 Hz, 2H), 7.66 (bs, 1H), 7.48-7.45 (m, 1H), 7.39-7.36 (m, 1H), 7.33-7.31 (m, 2H), 7.15 (d, J=8.1 Hz, 1H), 7.08-7.06 (m, 2H), 6.83 (d, J=5.9 Hz, 2H), 3.80 (s, 2H), 2.28 (s, 3H), 1.92 (s, 3H)

Mass, m/e: 417 (M⁺), 125 (base)

Example 145
3-(2,5-Dimethylphenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.35 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.97 (bs, 1H), 7.32-7.28 (m, 2H), 7.24-7.19 (m, 3H), 7.15 (d, J=7.7 Hz, 1H), 7.09-7.05 (m, 2H), 6.79 (dd, J=1.5 Hz, 4.6 Hz, 2H), 3.02 (t, J=7.3 Hz, 2H), 2.78 (t, J=7.3 Hz, 2H), 2.29 (s, 3H), 1.94 (s, 3H)

Mass, m/e: 397 (M⁺), 91 (base)

Example 146
3-(3,4-Dimethylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole
a) 5-Amino-3-(3,4-dimethylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.52 (dd, J=1.5 Hz, 4.5 Hz, 2H), 7.18-7.03 (m, 5H), 4.83 (bs, 2H), 2.28 (s, 3H), 2.23 (s, 3H)

Mass, m/e: 265 (M⁺), 77 (base)

b) 3-(3,4-Dimethylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.46 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.51 (bs, 1H), 7.40-7.20 (m, 6H), 7.07 (d, J=7.7 Hz, 1H), 6.98 (dd, J=1.5 Hz, 7.7 Hz, 1H), 6.90 (dd, J=1.5 Hz, 4.6 Hz, 2H), 3.76 (s, 2H), 2.26 (s, 3H), 2.20 (s, 3H)

Mass, m/e: 383 (M⁺), 91 (base)

Example 147
5-[2-(2-Fluorophenyl)acetylamino]-3-(3,4-dimethylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.48 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.65 (bs, 1H), 7.37-7.26 (m, 3H), 7.21 (m, 1H), 7.18-7.07 (m, 3H), 6.98 (dd, J=1.5 Hz, 4.6 Hz, 2H), 3.77 (s, 2H), 2.26 (s, 3H), 2.21 (s, 3H)

Mass, m/e: 401 (M⁺), 109 (base)

Example 148
5-[2-(2-Chlorophenyl)acetylamino]-3-(3,4-dimethylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.48 (d, J=6.2 Hz, 2H), 7.45-7.43 (m, 1H), 7.35-7.29 (m, 4H), 7.21 (bs, 1H), 7.07 (d, J=8.1 Hz, 1H), 7.01-6.99 (m, 3H), 3.87 (s, 2H), 2.26 (s, 3H), 2.21 (s, 3H)

Mass, m/e: 417 (M⁺), 125 (base)

Example 149
5-[2-(2-Chloro-4-fluorophenyl)acetylamino]-3-(3,4-dimethylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 11.05 (bs, 1H), 8.53 (dd, J=1.5 Hz, 4.4 Hz, 2H), 7.46-7.41 (m, 2H), 7.22-7.15 (m, 5H), 7.01 (dd, J=1.5 Hz, 7.7 Hz, 1H), 3.86 (s, 2H), 2.25 (s, 3H), 2.20 (s, 3H)

Mass, m/e: 435 (M⁺), 143 (base)

Example 150
3-(3,4-Dimethylphenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.49 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.58 (bs, 1H), 7.31-7.17 (m, 6H), 7.08-7.06 (m, 1H), 7.00 (d, J=1.5 Hz, 1H), 6.98 (dd, J=1.5 Hz, 4.6 Hz, 2H), 3.00 (t, J=7.3 Hz, 2H), 2.75 (t, J=7.3 Hz, 2H), 2.26 (s, 3H), 2.20 (s, 3H)

Mass, m/e: 397 (M⁺), 91 (base)

Example 151
3-(3,5-Dimethylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole
a) 5-Amino-3-(3,5-dimethylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.51 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.06-7.04 (m, 3H), 7.01 (s, 2H), 4.84 (bs, 2H), 2.26 (s, 6H)

Mass, m/e: 265 (M⁺), 77 (base)

b) 3-(3,5-Dimethylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.45 (dd, J=1.7 Hz, 4.6 Hz, 2H), 7.55 (bs, 1H), 7.41-7.26 (m, 5H), 7.04 (s, 1H), 6.94 (s, 2H), 6.89 (dd, J=1.7 Hz, 4.6 Hz, 2H), 3.75 (s, 2H), 2.23 (s, 6H)

Mass, m/e: 383 (M⁺), 91 (base)

Example 152
5-[(2-Chlorophenyl)acetylamino]-3-(3,5-dimethylphenyl)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.47 (dd, J=1.5 Hz, 4.2 Hz, 2H), 7.63 (bs, 1H), 7.44-7.42 (m, 1H), 7.33-7.28 (m, 3H), 7.04 (s, 1H), 6.98 (dd, J=1.5 Hz, 4.2 Hz, 2H), 6.94 (s, 2H), 3.87 (s, 2H), 2.23 (s, 6H)

Mass, m/e: 417 (M⁺), 125 (base)

Example 153
3-(3,5-Dimethylphenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.46 (dd, J=1.1 Hz, 4.6 Hz, 2H), 7.69 (bs, 1H), 7.31-7.17 (m, 5H), 7.04 (s, 1H), 6.96-6.95 (m, 4H), 3.00 (t, J=7.3 Hz, 2H), 2.75 (t, J=7.3 Hz, 2H), 2.23 (s, 6H)

Mass, m/e: 397 (M⁺), 91 (base)

Example 154
5-[(2-Chlorophenyl)acetylamino]-3-(2,6-dimethylphenyl)-4-(4-pyridyl)-isoxazole
a) 5-Amino-3-(2,6-dimethylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 8.28 (dd, J=1.9 Hz, 4.6 Hz, 2H), 7.44 (bs, 2H), 7.28 (t, J=7.9 Hz, 1H), 7.14 (d, J=7.9 Hz, 2H), 6.85 (dd, J=1.9 Hz, 4.6 Hz, 2H), 2.03 (s, 6H)

Mass, m/e: 265 (M⁺), 77 (base)

b) 5-[(2-Chlorophenyl)acetylamino]-3-(2,6-dimethylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.50 (dd, J=1.6 Hz, 4.5 Hz, 2H), 7.73-7.63 (m, 3H), 7.49-7.46 (m, 2H), 7.41-7.37 (m, 3H), 7.29-7.27 (m, 1H), 6.90 (dd, J=1.6 Hz, 4.5 Hz, 2H), 3.77 (s, 2H)

Mass, m/e: 423 (M⁺), 91 (base)

Example 155
5-(Phenylacetylamino)-4-(4-pyridyl)-3-(3-trifluoromethylphenyl)-isoxazole
a) 5-Amino-4-(4-pyridyl)-3-(3-trifluoromethylphenyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.57 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.79 (s, 1H), 7.70 (d, J=7.7 Hz, 1H), 7.56 (d, J=7.7 Hz, 1H), 7.50 (t, J=7.7 Hz, 1H), 7.06 (dd, J=1.5 Hz, 4.6 Hz, 2H), 4.93 (bs, 2H)

Mass, m/e: 305 (M⁺), 173 (base)

b) 5-(Phenylacetylamino)-4-(4-pyridyl)-3-(3-trifluoromethyl-phenyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.50 (dd, J=1.6 Hz, 4.5 Hz, 2H), 7.73-7.63 (m, 3H), 7.49-7.46 (m, 2H), 7.41-7.37 (m, 3H), 7.29-7.27 (m, 1H), 6.90 (dd, J=1.6 Hz, 4.5 Hz, 2H), 3.77 (s, 2H)

Mass, m/e: 423 (M⁺), 91 (base)

Example 156
5-[(2-Chlorophenyl)acetylamino]-4-(4-pyridyl)-3-(3-trifluoro-methylphenyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 11.17 (bs, 1H), 8.52 (dd, J=1.6 Hz, 4.5 Hz, 2H), 7.88-7.84 (m, 1H), 7.71-7.64 (m, 3H), 7.45-7.40 (m, 1H), 7.38-7.34 (m, 1H), 7.31-7.26 (m, 2H), 7, 17 (dd, J=1.6 Hz, 4.5 Hz, 2H), 3.87 (s, 2H)

Mass, m/e: 457 (M⁺), 125 (base)

Example 157
5-[(2-Chlorophenyl)acetylamino]-3-(2-fluoro-3-trifluoromethylphenyl)-4-(4-pyridyl)isoxazole
a) 5-Amino-3-(2-fluoro-3-trifluoromethylphenyl)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.50 (dd, J=1.5 Hz, 4.4 Hz, 2H), 7.71 (m, 2H), 7.33 (t, J=7.7 Hz, 1H), 6.97 (dd, J=1.5 Hz, 4.4 Hz, 2H), 4.98 (bs, 2H)

Mass, m/e: 323 (M⁺), 63 (base)

b) 5-[(2-Chlorophenyl)acetylamino]-3-(2-fluoro-3-trifluoromethyl-phenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 11.31 (bs, 1H), 8.48 (dd, J=1.5 Hz, 4.2 Hz, 2H), 7.98 (t, J=6.9 Hz, 1H), 7.91 (t, J=7.7 Hz, 1H), 7.58 (t, J=7.7 Hz, 1H), 7.46-7.38 (m, 2H), 7.33-7.28 (m, 2H), 7.10 (dd, J=1.5 Hz, 4.2 Hz, 2H), 3.92 (s, 2H)

Mass, m/e: 475 (M⁺), 125 (base)

Example 158
3-(2-Fluoro-4-trifluoromethylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole
a) 5-Amino-3-(2-fluoro-4-trifluoromethylphenyl)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.48 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.64 (t, J=7.3 Hz, 1H), 7.50 (d, J=8.0 Hz, 1H), 7.34 (d, J=9.6 Hz, 1H), 6.97 (dd, J=1.5 Hz, 4.6 Hz, 2H), 5.13 (bs, 2H)

Mass, m/e: 323 (M⁺), 63 (base)

b) 3-(2-Fluoro-4-trifluoromethylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.45 (dd, J=1.5 Hz, 4.2 Hz, 2H), 7.63 (t, J=7.3 Hz, 1H), 7.54 (bs, 1H), 7.51 (d, J=9.25 Hz, 1H), 7.39-7.38 (m, 3H), 7.32-7.27 (m, 3H), 6.79 (dd, J=1.5 Hz, 4.2 Hz, 2H), 3.78 (s, 2H)

Mass, m/e: 441 (M⁺), 91 (base)

Example 159
5-[(2-Chlorophenyl)acetylamino]-3-(2-fluoro-4-trifluoromethylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 11.29 (bs, 1H), 8.49 (dd, J=1.9 Hz, 4.6 Hz, 2H), 7.85-7.82 (m, 2H), 7.77 (d, J=8.0 Hz, 1H), 7.46-7.38 (m, 2H), 7.33-7.30 (m, 2H), 7.12 (dd, J=1.9 Hz, 4.6 Hz, 2H), 3.91 (s, 2H)

Mass, m/e: 475 (M⁺), 125 (base)

Example 160
3-(2-Fluoro-5-trifluoromethylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole
a) 5-Amino-3-(2-fluoro-5-trifluoromethylphenyl)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.51 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.85 (dd, J=2.3 Hz, 6.1 Hz, 1H), 7.75-7.71 (m, 1H), 7.18 (t, J=8.8 Hz, 1H), 6.98 (dd, J=1.5 Hz, 4.6 Hz, 2H), 4.97 (bs, 2H)

Mass, m/e: 323 (M⁺), 63 (base)

b) 3-(2-Fluoro-5-trifluoromethylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.45 (dd, J=1.7 Hz, 4.6 Hz, 2H), 7.83 (dd, J=2.3 Hz, 6, 1 Hz, 1H), 7.75-7.71 (m, 1H), 7.53 (bs, 1H), 7.43-7.23 (m, 5H), 7.15 (t, J=9.3 Hz, 1H), 6.80 (dd, J=1.7 Hz, 4.6 Hz, 2H), 3.78 (s, 2H)

Mass, m/e: 441 (M⁺), 91 (base)

Example 161
5-[(2-Chlorophenyl)acetylamino]-3-(2-fluoro-5-trifluoromethylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.45 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.83 (dd, J=2.3 Hz, 5.8 Hz, 2H), 7.75-7.71 (m, 1H), 7.46-7.44 (m, 1H), 7.36-7.28 (m, 3H), 7.15 (t, J=8.8 Hz, 1H), 6.90 (dd, J=1.5 Hz, 4.6 Hz, 2H), 3.89 (s, 2H)

Mass, m/e: 475 (M⁺), 125 (base)

Example 162
3-(2-Fluoro-5-trifluoromethylphenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.40 (dd, J=1.6 Hz, 4.4 Hz, 2H), 8.19 (bs, 1H), 7.82 (dd, J=2.3 Hz, 6.1 Hz, 1H), 7.75-7.71 (m, 1H), 7.32-7.13 (m, 6H), 6.86 (dd, J=1.6 Hz, 4.4 Hz, 2H), 3.01 (t, J=7.3 Hz, 2H), 2.77 (t, J=7.3 Hz, 2H)

Mass, m/e: 455 (M⁺), 91 (base)

Example 163
3-(3-(Fluoro-5-trifluoromethylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole
a) 5-Amino-3-(3-fluoro-5-trifluoromethylphenyl)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.53 (dd, J=1.5 Hz, 4.4 Hz, 2H), 7.52 (s, 1H), 7.38 (d, J=8.0 Hz, 1H), 7.29 (d, J=8.8 Hz, 1H), 7.04 (dd, J=1.5 Hz, 4.4 Hz, 2H), 5.15 (bs, 2H)

Mass, m/e: 323 (M⁺), 63 (base)

b) 3-(3-(Fluoro-5-trifluoromethylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.51 (m, 2H), 7.71 (bs, 1H), 7.47 (s, 1H), 7.41-7.37 (m, 4H), 7.26-7.23 (m, 3H), 6.90 (dd, J=1.5 Hz, 4.2 Hz, 2H), 3.75 (s, 2H)

Mass, m/e: 441 (M⁺), 91 (base)

Example 164
5-[(2-Chlorophenyl)acetylamino]-3-(3-fluoro-5-trifluoromethylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.52 (d, J=5.7 Hz, 2H), 7.83 (bs, 1H), 7.48 (s, 1H), 7.44-7.42 (m, 1H), 7.38 (d, J=8.0 Hz, 1H), 7.34-7.28 (m, 3H), 7.25 (d, J=5.4 Hz, 1H), 6.99 (d, J=5.7 Hz, 2H), 3.87 (s, 2H)

Mass, m/e: 475 (M⁺), 125 (base)

Example 165
3-(3-Fluoro-5-trifluoromethylphenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.49 (dd, J=1.7 Hz, 4.5 Hz, 2H), 7.98 (bs, 1H), 7.46 (s, 1H), 7.38 (d, J=8.0 Hz, 1H), 7.31-7.17 (m, 6H), 6.95 (dd, J=1.7 Hz, 4.5 Hz, 2H), 3.01 (q, J=7.3 Hz, 2H), 2.76 (q, J=7.3 Hz, 2H)

Mass, m/e: 455 (M⁺), 91 (base)

Example 166
3-(4-Fluoro-3-trifluoromethylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole
a) 5-Amino-3-(4-fluoro-3-trifluoromethylphenyl)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.57 (dd, J=1.5 Hz, 4.2 Hz, 2H), 7.79 (dd, J=2.1 Hz, 6.7 Hz, 1H), 7.56-7.51 (m, 1H), 7.19 (t, J=9.2 Hz, 1H), 7.05 (dd, J=1.5 Hz, 4.2 Hz, 2H), 4.92 (bs, 2H)

Mass, m/e: 323 (M⁺, base)

b) 3-(4-Fluoro-3-trifluoromethylphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.52 (dd, J=1.7 Hz, 4.4 Hz, 2H), 7.73 (dd, J=2.1 Hz, 6.7 Hz, 1H), 7.54 (bs, 1H), 7.49-7.44 (m, 1H), 7.43-7.36 (m, 3H), 7.28-7.24 (m, 2H), 7.17 (t, J=9.2 Hz, 1H), 6.90 (dd, J=1.7 Hz, 4.4 Hz, 2H), 3.76 (s, 2H)

Mass, m/e: 441 (M⁺), 91 (base)

Example 167
5-[(2-Chlorophenyl)acetylamino]-3-(4-fluoro-3-trifluoromethylphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.53 (dd, J=1.7 Hz, 4.4 Hz, 2H), 7.74 (dd, J=2.1 Hz, 6.7 Hz, 1H), 7.69 (bs, 1H), 7.51-7.42 (m, 2H), 7.35-7.28 (m, 3H), 7.17 (t, J=9.2 Hz, 1H), 6.99 (dd, J=1.7 Hz, 4.4 Hz, 2H), 3.87 (s, 2H)

Mass, m/e: 475 (M⁺), 125 (base)

Example 168
3-(3-Fluoro-5-trifluoromethylphenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.52 (dd, J=1.6 Hz, 4.5 Hz, 2H), 7.76-7.71 (m, 2H), 7.50-7.44 (m, 1H), 7.32-7.27 (m, 2H), 7.25-7.16 (m, 3H), 6.96 (dd, J=1.6 Hz, 4.5 Hz, 2H), 3.01 (t, J=7.3 Hz, 2H), 2.75 (t, J=7.3 Hz, 2H)

Mass, m/e: 455 (M⁺), 91 (base)

Example 169
3-(4-Chloro-3-trifluorophenyl)-5-(phenylacetylamino)-4-(4-pyridyl)-isoxazole
a) 5-Amino-3-(4-chloro-3-trifluorophenyl)-4-(pyridyl)isoxazl

¹H-NMR (CDCl₃) δ: 8.58 (dd, J=1.5 Hz, 4.5 Hz, 2H), 7.85 (m, 1H), 7.47 (m, 2H), 7.05 (dd, J=1.5 Hz, 4.5 Hz, 2H), 4.90 (bs, 2H)

Mass, m/e: 339 (M⁺), 63 (base)

b) 3-(4-Chloro-3-trifluorophenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.53 (dd, J=1.5 Hz, 4.4 Hz, 2H), 7.80 (d, J=1.9 Hz, 1H), 7.51 (bs, 1H), 7.47 (d, J=8.5 Hz, 1H), 7.40-7.35 (m, 4H), 7.27-7.24 (m, 2H), 6.90 (dd, J=1.5 Hz, 4.4 Hz, 2H), 3.76 (s, 2H)

Mass, m/e: 457 (M⁺), 91 (base)

Example 170
3-(4-Chloro-3-trifluorophenyl)-5-[2-(2-chlorophenyl)acetylamino]-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.54 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.81 (d, J=1.9 Hz, 1H), 7.60 (bs, 1H), 7.49-7.39 (m, 3H), 7.35-7.29 (m, 3H), 6.99 (dd, J=1.5 Hz, 4.6 Hz, 2H), 3.87 (s, 2H)

Mass, m/e: 491 (M⁺), 125 (base)

Example 171
3-(4-Chloro-3-trifluorophenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.53 (dd, J=1.5 Hz, 4.2 Hz, 2H), 7.80 (d, J=1.9 Hz, 1H), 7.75 (bs, 1H), 7.48-7.37 (m, 2H), 7.32-7.17 (m, 5H), 6.96 (dd, J=1.5 Hz, 4.2 Hz, 2H), 3.00 (t, J=7.3 Hz, 2H), 2.75 (t, J=7.3 Hz, 2H)

Mass, m/e: 471 (M⁺), 91 (base)

Example 172
3-(4-Biphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole
a) 5-Amino-3-(4-biphenyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.56 (dd, J=1.5 Hz, 4.4 Hz, 2H), 7.63-7.58 (m, 4H), 7.52-7.42 (m, 4H), 7.39-7.33 (m, 1H), 7.11 (dd, J=1.5 Hz, 4.4 Hz, 2H), 4.82 (bs, 2H)

Mass, m/e: 313 (M⁺), 152 (base)

b) 3-(4-Biphenyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.48 (dd, J=1.7 Hz, 4.6 Hz, 2H), 7.61 (bs, 1H), 7.58-7.56 (m, 4H), 7.45-7.34 (m, 9H), 7.28-7.25 (m, 1H), 6.94 (dd, J=1.7 Hz, 4.6 Hz, 2H), 3.77 (s, 2H)

Mass, m/e: 431 (M⁺), 91 (base)

Example 173
5-[(2-Chlorophenyl)acetylamino)]-3-(4-biphenyl)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.50 (dd, J=1.7 Hz, 4.6 Hz, 2H), 7.66 (bs, 1H), 7.57 (d, J=8.1 Hz, 4H), 7.45-7.41 (m, 5H), 7.38-7.28 (m, 4H), 7.04 (dd, J=1.7 Hz, 4.6 Hz, 2H), 3.88 (s, 2H)

Mass, m/e: 465 (M⁺), 179 (base)

Example 174
3-(4-Biphenyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 10.84 (bs, 1H), 8.52 (dd, J=1.5 Hz, 4.2 Hz, 2H), 7.75 (d, J=8.5 Hz, 2H), 7.71 (d, J=7.3 Hz, 2H), 7.50-7.44 (m, 4H), 7.39 (t, J=7.3 Hz, 1H), 7.31-7.27 (m, 2H), 7.23-7.20 (m, 3H), 7.12 (dd, J=1.5 Hz, 4.2 Hz, 2H), 2.87 (t, J=7.5 Hz, 2H), 2.68 (t, J=7.5 Hz, 2H)

Mass, m/e: 445 (M⁺), 91 (base)

Example 175
3-(1-Naphthyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole
a) 5-Amino-3-(1-naphthyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.30 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.97-7.92 (m, 1H), 7.87 (d, J=7.7 Hz, 1H), 7.83 (d, J=8.5 Hz, 1H), 7.51-7.44 (m, 3H), 7.39-7.35 (m, 1H), 6.83 (dd, J=1.5 Hz, 4.6 Hz, 2H), 5.02 (bs, 2H)

Mass, m/e: 287 (M⁺, base)

b) 3-(1-Naphthyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.22 (dd, J=1.9 Hz, 4.6 Hz, 2H), 7.94 (d, J=8.1 Hz, 1H), 7.86 (d, J=8.1 Hz, 1H), 7.84 (bs, 1H), 7.67 (d, J=8.5 Hz, 1H), 7.49-7.29 (m, 9H), 6.65 (dd, J=1.9 Hz, 4.6 Hz, 2H), 3.82 (s, 2H)

Mass, m/e: 405 (M⁺), 91 (base)

Example 176
5-[(2-Chlorophenyl)acetylamino]-3-(1-naphthyl)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.25 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.94 (d, J=8.1 Hz, 1H), 7.86 (bs, 1H), 7.86 (d, J=8.1 Hz, 1H), 7.70 (d, J=9.2 Hz, 1H), 7.48-7.30 (m, 8H), 6.77 (dd, J=1.5 Hz, 4.6 Hz, 2H), 3.94 (s, 2H)

Mass, m/e: 439 (M⁺), 125 (base)

Example 177
3-(1-(Naphthyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.23 (dd, J=1.5 Hz, 4.6 Hz, 2H), 8.05 (bs, 1H), 7.92 (d, J=8.1 Hz, 1H), 7.86 (d, J=8.1 Hz, 1H), 7.72 (d, J=8.1 Hz, 1H), 7.46 (t, J=6.9 Hz, 2H), 7.41-7.20 (m, 8H), 6.73 (dd, J=1.5 Hz, 4.6 Hz, 1H), 3.04 (t, J=7.3 Hz, 2H), 2.81 (t, J=7.3 Hz, 2H)

Mass, m/e: 419 (M⁺), 91 (base)

Example 178
3-(2-Naphthyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole
a) 5-Amino-3-(2-naphthyl)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.52 (dd, J=1.6 Hz, 4.5 Hz, 2H), 7.97 (s, 1H), 7.87-7.76 (m, 3H), 7.56-7.44 (m, 3H), 7.08 (dd, J=1.6 Hz, 4.5 Hz, 2H), 4.87 (bs, 2H)

Mass, m/e: 287 (M⁺), 154 (base)

b) 3-(2-Naphthyl)-5-(phenylacetylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.46 (dd, J=1.6 Hz, 4.3 Hz, 2H), 7.90-7.72 (m, 4H), 7.63 (bs, 1H), 7.55-7.46 (m, 2H), 7.43-7.34 (m, 4H), 7.30-7.26 (m, 2H), 6.92 (dd, J=1.6 Hz, 4.3 Hz, 2H), 3.78 (s, 2H)

Mass, m/e: 405 (M⁺), 91 (base)

Example 179
5-[2-(2-Chlorophenyl)acetylamino]-3-(2-naphthyl)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.47 (dd, J=1.6 Hz, 4.5 Hz, 2H), 7.90 (bs, 1H), 7.85-7.73 (m, 4H), 7.55-7.27 (m, 7H), 7.02 (dd, J=1.6 Hz, 4.5 Hz, 2H), 3.89 (s, 2H)

Mass, m/e: 439 (M⁺), 153 (base)

Example 180
3-(2-Naphthyl)-5-(3-phenylpropionylamino)-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.45 (dd, J=1.5 Hz, 4.6 Hz, 2H), 7.92 (bs, 1H), 7.88 (s, 1H), 7.81 (dd, J=8.2 Hz, 14.8 Hz, 2H), 7.73 (d, J=8.2 Hz, 1H), 7.56-7.46 (m, 2H), 7.39 (dd, J=1.9 Hz, 8.5 Hz, 1H), 7.32-7.17 (m, 4H), 6.99 (dd, J=1.5 Hz, 4.6 Hz, 2H), 3.02 (t, J=7.3 Hz, 2H), 2.78 (t, J=7.3 Hz, 2H)

Mass, m/e: 419 (M⁺), 91 (base)

Example 181
3-[2-(5-Methylfuryl)]-5-phenylacetylamino-4-(4-pyridyl)isoxazole
a) 5-Amino-3-[2-(5-methylfuryl)]-4-(4-pyridyl)isoxazole

¹H-NMR (CDCl₃) δ: 8.61 (dd, J=4.2 Hz, 5.8 Hz, 2H), 7.26 (dd, J=1.7 Hz, 4.2 Hz, 2H), 6.46 (d, J=3.5 Hz, 1H), 6.02 (dd, J=3.5 Hz, 4.2 Hz, 1H), 4.82-4.72 (bs, 2H), 2.30 (s, 3H)

Mass, m/e: 241 (M⁺), 118 (base)

b) 3-[2-(5-Methylfuryl)]-5-phenylacetylamino-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.57 (dd, J=4.6 Hz, 6.2 Hz, 2H), 7.41-7.31 (m, 4H), 7.24-7.20 (m, 2H), 7.10 (dd, J=4.6 Hz, 6.2 Hz, 2H), 6.35 (d, J=3.5 Hz, 1H), 6.01-5.98 (m, 1H), 3.72 (s, 2H), 2.28 (s, 3H)

Mass, m/e: 359 (M⁺), 91 (base)

Example 182
5-[2-(2-Chlorophenyl)acetylamino]-3-[2-(5-methylfuryl)]-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.58 (dd, J=4.6 Hz, 6.2 Hz, 2H), 7.53-7.50 (bs, 1H), 7.44-7.40 (m, 1H), 7.33-7.24 (m, 3H), 7.17 (dd, J=4.6 Hz, 6.2 Hz, 2H), 6.36 (d, J=3.1 Hz, 1H), 6.02-5.98 (m, 1H), 3.83 (s, 2H), 2.28 (s, 3H)

Mass, m/e: 393 (M⁺), 125 (base)

Example 183
3-[2-(5-Methylfuryl)]-5-(3-phenylpropionylamino)-4-(4-pyridyl)-isoxazole

¹H-NMR (CDCl₃) δ: 8.58 (dd, J=4.4 Hz, 6.2 Hz, 2H), 7.56-7.50 (bs, 1H), 7.30-7.19 (m, 5H), 7.15 (dd, J=4.4 Hz, 6.2 Hz, 2H), 6.34 (d, J=3.5 Hz, 1H), 6.01-5.98 (m, 1H), 2.97 (t, J=7.4 Hz, 2H), 2.71 (t, J=7.4 Hz, 2H), 2.28 (s, 3H)

Mass, m/e: 373 (M⁺), 91 (base)

Example 184
3-(4-Fluorophenyl)-4-[4-(2-fluoropyridyl)]-5-(phenylacetylamino)-isoxazole
a) 4-(2-Fluoropyridyl)acetonitrile

A mixture of 1.0 g of 2-fluoro-4-methylpyridine and 2.2 g of t-butoxybisdimethylaminomethane was stirred at 180° C. for 18 hours. The reaction solution was cooled, from which t-butoxybisdimethyl-aminomethane was distilled off under reduced pressure, to provide a dark brown, oily residue. To the residue, 10 mL of water and 2.5 g of hydroxylamine-O-sulfonic acid were added and stirred at room temperature for 30 minutes. The reaction solution was rendered basic by addition of saturated aqueous sodium hydrogencarbonate solution under cooling with ice, and extracted with methylene chloride. The methylene chloride extract was dried over anhydrous magnesium sulfate, and removed of the solvent by reduced pressure distillation to provide 0.93 g (yield, 76%) of the title compound as pale yellow crystals.

¹H-NMR (CDCl₃) δ: 8.26 (d, J=5.0 Hz, 1H), 7.20-7.17 (m, 1H), 6.97-6.95 (m, 1H), 3.81 (s, 2H)

Mass, m/e: 136 (M⁺, base)

b) 5-Amino-3-(4-fluorophenyl)-4-[4-(2-fluoropyridyl)]isoxazole

In 5 ml of ethanol, 0.132 g of sodium ethoxide was dissolved and into which a solution of 0.39 g of 2-fluoro-4-pyridylacetonitrile in 5 mL of THF was dropped, followed by 20 minutes' stirring under cooling with ice. Then a solution of 0.50 g of 4-fluorobenz-hydroxymoyl chloride in 5 mL of ethanol was added dropwise under cooling with ice, and thereafter stirred at room temperature for 2 hours. After distilling the solvent off from the reaction solution under reduced pressure, water was added, and the precipitated residue was recovered by filtration, washed with water and dried under reduced pressure. The residue was purified on 20 g silica gel column chromatography (eluent, chloroform→chloroform:methanol=100:1) to provide 0.597 g (yield: 76%) of the title compound as light brown crystals.

¹H-NMR (DMSO-d₆) δ: 8.05 (d, J=5.4 Hz, 1H), 7.43-7.37 (m, 4H), 7.30-7.24 (m, 2H), 6.86-6.84 (m, 1H), 6.78 (bs, 1H)

Mass, m/e: 273 (M⁺), 123 (base)

c) 3-(4-Fluorophenyl)-4-[4-(2-fluoropyridyl)]-5-(phenylacetyl-amino)isoxazole

In 5 mL of THF, 0.180 g of imidazole and 0.43 mL of DBU were dissolved, and while stirring it under cooling with ice, 0.24 mL of phenylacetyl chloride was dropped thereinto, followed by 10 minutes' stirring at room temperature. Then a solution of 0.120 g of 5-amino-3-(4-fluorophenyl)-4-[4-(2-fluoropyridyl)]isoxazole in 4 mL of THF was added dropwise, followed by 8 hours' stirring at room temperature. Distilling the solvent off from the reaction solution under reduced pressure, water was added to the residue, followed by extraction with methylene chloride. The organic layer was dried over anhydrous magnesium sulfate and from which the solvent was distilled off under reduced pressure. The resultant residue was purified on 20 g silica gel column chromatography (eluent, chloroform→chloroform:methanol=50:1) and recrystallized from ether-hexane to provide 0.132 g (yield: 77%) of the title compound as colorless crystals.

¹H-NMR (CDCl₃) δ: 8.10 (d, J=5.4 Hz, 1H), 7.50-7.24 (m, 8H), 7.10-7.04 (m, 2H), 6.89 (dt, J=1.5 Hz, 5.4 Hz, 1H), 6.57 (bs, 1H), 3.77 (s, 2H)

Mass, m/e: 391 (M⁺), 91 (base)

Example 185
5-[2-(2-Chlorophenyl)acetylamino]-3-(4-fluorophenyl)-4-[4-(2-fluoropyridyl)]isoxazole

The title compound was synthesized in the manner similar to Example 184.

¹H-NMR (CDCl₃) δ: 8.11 (d, J=5.4 Hz, 1H), 7.53 (bs, 1H), 7.47-7.45 (m, 1H), 7.37-7.30 (m, 5H), 7.09-7.04 (m, 2H), 6.85 (dt, J=1.5 Hz, 5.4 Hz, 1H), 6.63 (bs, 1H), 3.87 (s, 2H)

Mass, m/e: 425 (M⁺), 125 (base)

Example 186
4-[4-(2-Bromopyridyl)]-3-(4-fluorophenyl)-5-(phenylacetylamino)-isoxazole
a) 4-(2-Bromopyridyl)acetonitrile

A mixture of 1.5 g of 2-bromo-4-methylpyridine and 3.0 g of t-butoxybisdimethylaminomethane was stirred at 110° C. for 15 hours. The reaction solution was cooled, and from which t-butoxybisdimethylaminomethane was distilled off under reduced pressure to provide dark brown oily residue. To this residue 20 mL of water and 2.5 g of hydroxylamine-O-sulfonic acid were added and stirred at room temperature for an hour. The crystals precipitated in the reaction solution were recovered by filtration, washed with water, and dried to provide 1.06 g (yield: 62%) of the title compound as brown crystals.

¹H-NMR (CDCl₃) δ: 8.40 (d, J=5.0 Hz, 1H), 7.51 (dd, J=0.8 Hz, 1.5 Hz, 1H), 7.27-7.24 (m, 1H), 3.75 (s, 2H)

Mass, m/e: 196 (M⁺), 117 (base)

b) 5-Amino-4-[4-(2-bromopyridyl)]-3-(4-fluorophenyl)isoxazole

In 5 mL of ethanol, 0.380 g of sodium ethoxide was dissolved, and into which a solution of 1.0 g of 2-bromo-4-pyridylacetonitrile in 10 mL of THF was dropped, followed by 30 minutes' stirring at room temperature. Then a solution of 0.881 g of 4-fluorobenzhydroxymoyl chloride in 5 mL of ethanol was dropped, followed by 5 hours' stirring at room temperature. After distilling the solvent off from the reaction solution under reduced pressure, saturated aqueous ammonium chloride solution was added and extracted with methylene chloride. The methylene chloride extract was dried over anhydrous magnesium sulfate, from which the solvent was distilled off under reduced pressure The resultant residue was purified on 50 g silica gel column chromatography (eluent, chloroform→chloroform:methanol=50:1) to provide 0.77 g (yield: 45%) of the title compound as reddish dark brown crystals.

¹H-NMR (CDCl₃) δ: 8.26 (d, J=5.0 Hz, 1H), 7.41-7.38 (m, 2H), 7.28 (d, J=1.2 Hz, 1H), 7.11-7.07 (m, 2H), 6.93 (dd, J=1.5 Hz, 5.0 Hz, 1H), 4.91 (bs, 2H)

Mass, m/e: 335 (M⁺), 123 (base)

c) 4-[4-(2-Bromopyridyl)]-3-(4-fluorophenyl)-5-(phenylacetyl-amino)isoxazole

In 3 mL of THF, 0.124 g of imidazole and 0.54 mL of DBU were dissolved, to which 0.23 mL of phenylacetyl chloride was added dropwise under stirring and cooling with ice, followed by 10 minutes' stirring at room temperature. Then a solution of 0.200 g of 5-amino-3-(4-fluorophenyl)-4-[4-(2-bromopyridyl)]isoxazole in 10 mL of THF was added dropwise, followed by 17 hours' stirring at room temperature. Distilling the solvent off from the reaction solution under reduced pressure, water was added to the residue and extracted with methylene chloride. The organic layer was dried over anhydrous magnesium sulfate and from which the solvent was distilled off under reduced pressure. The resultant residue was purified on 10 g silica gel column chromatography (eluent, chloroform→chloroform:methanol=100:1) to provide 0.260 g (yield: 96%) of the title compound as pale yellow crystals.

¹H-NMR (CDCl₃) δ: 8.24 (d, J=5.0 Hz, 1H), 7.44-7.26 (m, 8H), 7.17 (bs, 1H), 7.10-7.03 (m, 2H), 6.84 (dd, J=1.5 Hz, 5.0 Hz, 1H), 3.76 (s, 2H)

Mass, m/e: 453 (M⁺), 91 (base)

Example 187
3-(4-Fluorophenyl)-4-[4-(2-methoxypyridyl)]-5-(phenylacetylamino)-isoxazole
a) 5-Amino-3-(4-fluorophenyl)-4-[4-(2-methoxypyridyl)]isoxazole

A mixture of 0.100 g of 5-amino-3-(4-fluorophenyl)-4-[4-(2-fluoropyridyl)]isoxazole, 3 mL of methanol and 0.2 mL of methanol solution containing 28% NaOMe was heated and refluxed under atmosphere of argon for 4.5 hours. After termination of the reaction, the reaction solution was distilled off under reduced pressure. The residue was dissolved in chloroform and washed with saturated aqueous ammonium chloride solution. The organic layer was dried over magnesium sulfate, and from which the solvent was distilled off under reduced pressure. The resultant residue was purified on 5 g silica gel column chromatography (eluent, chloroform:methanol=50:1) to provide 0.162 g (yield: 97%) of the title compound.

¹H-NMR (CDCl₃) δ: 8.08 (d, J=5.0 Hz, 1H), 7.47-7.41 (m, 2H), 7.11-7.03 (m, 2H), 6.57 (dd, J=1.5 Hz, 5.2 Hz, 1H), 6.54 (m, 1H), 4.78 (bs, 2H), 3.92 (s, 3H)

Mass, m/e: 285 (M⁺, base)

b) 3-(4-Fluorophenyl)-4-[(4-(2-methoxypyridyl)]-5-(phenylacetyl-amino)isoxazole

In 5 mL of THF, 0.050 g of imidazole and 0.22 mL of DBU were dissolved, to which 0.10 mL of phenylacetyl chloride was added dropwise under stirring and cooling with ice, followed by ten minutes' stirring at room temperature. Then a solution of 0.050 g of 5-amino-3-(4-fluorophenyl)-4-[4-(2-methoxypyridyl)]isoxazole in 5 mL of THF was added dropwise, followed by 5 hours' stirring at room temperature. Distilling the solvent off from the reaction solution under reduced pressure, water was added to the residue and extracted with ethyl acetate. The organic layer was dried over anhydrous magnesium sulfate, and from which the solvent was distilled off under reduced pressure. The resultant residue was purified on 10 g silica gel column chromatography (eluent, chloroform→chloroform:methanol=60:1) to provide 0.132 g (yield: 61%) of the title compound as colorless crystals.

¹H-NMR (CDCl₃) δ: 8.05 (d, J=5.4 Hz, 1H), 7.40-7.36 (m, 5H), 7.30-7.26 (m, 1H), 7.06-7.02 (m, 2H), 6.45 (dd, J=1.5 Hz, 5.2 Hz, 1H), 6.39 (bs, 1H), 4.78 (bs, 2H), 3.93 (s, 3H), 3.77 (s, 2H)

Mass, m/e: 403 (M⁺), 91 (base)

Example 188
3-(4-Fluorophenyl)-4-[4-(2-methoxypyridyl)]-5-[(2-chlorophenyl)-acetylamino] isoxazole

The title compound was synthesized in the manner similar to Example 187.

¹H-NMR (CDCl₃) δ: 8.09-8.05 (m, 1H), 7.45-7.23 (m, 7H), 7.08-7.02 (m, 2H), 6.58-6.52 (m, 1H), 6.47 (bs, 1H), 3.93 (s, 3H), 3.88 (s, 2H)

Mass, m/e: 437 (M⁺), 125 (base)

Example 189
4-[4-(2-aminopyridyl)]-3-(4-fluorophenyl)-5-(phenylacetylamino)-isoxazole
a) 2-[1-(2,4-dimethylpyrrolyl)]-4-methylpyridine

To 100 mL of a benzene solution containing 5.00 g of 2-amino-4-methylpyridine and 5.96 g of acetonylacetone, 3.20 mL of acetic acid was added and heated under reflux for 12 hours. Thereafter 2.98 g of acetonylacetone and 1.6 mL of acetic acid were added, followed by further 9 hours' heating under reflux. Then water-methanol was added to the reaction solution and stirred for an hour at room temperature. The crystals precipitated were recovered by filtration and dried under reduced pressure to provide 6.24 g (yield: 73%) of the title compound as light brown crystal.

¹H-NMR (CDCl₃) δ: 8.44 (d, J=5.1 Hz, 1H), 7.20-7.00 (m, 2H), 5.87 (s, 2H), 2.42 (s, 3H), 2.11 (s, 6H)

b) 2-[1-(2,5-dimethylpyrrolyl)]-4-pyridylacetonitrile

A mixture of 3.0 g of 2-[1-(2,4-dimethylpyrrolyl)]-4-methylpyridine and 8.3 g of t-butoxybisdimethylaminomethane was stirred at 110° C. for 4 hours. The reaction solution was cooled and from which the t-butoxybisdimethylaminomethane was distilled off under reduced pressure, to obtain blackish brown, oily residue. Ten (10) mL of water and 4.6 g of hydroxylamine-O-sulfonic acid were added to the residue and stirred at room temperature for an hour. The reaction solution was rendered basic by addition of saturated aqueous sodium hydrogencarbonate solution under cooling with ice, and extracted with methylene chloride. The methylene chloride extract was dried over anhydrous magnesium sulfate and from which the solvent was distilled off under reduced pressure. The resultant residue was purified on 100 g silica gel column chromatography (eluent, chloroform:methanol=100:1) to provide 2.8 g (yield: 82%) of the title compound as pale yellow crystal.

¹H-NMR (CDCl₃) δ: 8.62 (d, J=5.1 Hz, 1H), 7.40-7.20 (m, 2H), 5.91 (s, 2H), 3.84 (s, 2H), 2.13 (s, 6H)

c) 5-Amino-3-(4-fluorophenyl)-4-[4-[2-[1-(2,5-dimethylpyrrolyl)]-pyridyl]]isoxazole

In 10 mL of ethanol, 0.707 g of sodium ethoxide was dissolved, and into which 10 mL of THF solution containing 1.1 g of 2-[1-(2,5-dimethylpyrrolyl)]-4-pyridylacetonitrile was dropped, followed by 30 minutes' stirring at room temperature. Then 10 mL of an ethanol solution containing 0.900 g of 4-fluorobenzhydroxymoyl chloride was added dropwise, followed by 2 hours' stirring at room temperature. The solvent was distilled off under reduced pressure, and saturated aqueous ammonium chloride solution was added to the residue, followed by extraction with methylene chloride. The organic layer was dried over anhydrous magnesium chloride and from which the solvent was distilled off under reduced pressure. The resultant residue was purified on 50 g silica gel column chromatography (eluent, chloroform:methanol=50:1) to provide 0.96 g (yield: 53%) of the title compound as pale brown crystal.

¹H-NMR (CDCl₃) δ: 8.55 (d, J=5.0 Hz, 1H), 7.44-7.40 (m, 2H), 7.12-7.06 (m, 3H), 6.89 (d, J=1.5 Hz, 1H), 5.85 (s, 2H), 4.88 (bs s, 2H), 2.01 (s, 6H)

Mass, m/e: 348 (M+base)

d) 3-(4-Fluorophenyl)-4-[4-[2-[1-(2,5-dimethylpyrrolyl)]pyridyl]]-5-(phenylacetylamino)isoxazole

To a mixture of 0.080 g of imidazole and 3 mL of THF, first 0.17 mL of DBU and then 0.15 mL of phenylacetyl chloride was added and stirred at room temperature for 15 minutes. Five (5) mL of THF solution containing 0.10 g of 5-amino-3-(4-fluorophenyl)-4-[4-[2-[1-(2,5-dimethylpyrrolyl)]pyridyl]]isoxazole and 0.17 mL of DBU was added, followed by 2 hours' stirring at room temperature. Water was added to the reaction solution which was then extracted with methylene chloride. The extract was washed first with saturated aqueous NaHCO₃solution and then with saturated brine, dried over anhydrous magnesium sulfate and from which the solvent was distilled off under reduced pressure. The resultant residue was purified on 10 g silica gel column chromatography (eluent, chloroform→chloroform:methanol=50:1) and washed with ether to provide 0.037 g (yield: 27%) of the crystalline title compound.

¹H-NMR (CDCl₃) δ: 8.49 (dd, J=0.8 Hz, 5.1 Hz, 1H), 7.39-7.33 (m, 6H), 7.23-7.21 (m, 2H), 7.07-7.03 (m, 2H), 6.93 (dd, J=1.5 Hz, 5.1 Hz, 1H), 6.83 (bs, 1H), 5.86 (s, 2H), 3.74 (s, 2H), 2.00 (s, 6H)

Mass, m/e: 466 (M⁺), 91 (base)

e) 4-[4-(2-Aminopyridyl)]-3-(4-fluorophenyl)-5-(phenylacetyl-amino)isoxazole

A mixture of 0.032 g of 3-(4-fluorophenyl)-4-[4-[2-[1-(2,5-dimethylpyrrolyl)]pyridyl]]-5-(phenylacetylamino)isoxazole, 0.058 g of hydroxylamine hydrochloride, 1 mL of ethanol and 1 mL of water was stirred at room temperature for 19 hours. The reaction solution was cooled, from which the solvent was distilled off under reduced pressure and water was added to the residue, followed by extraction with chloroform. The chloroform extract was washed with saturated brine, dried over anhydrous magnesium sulfate, and from which the solvent was distilled off under reduced pressure. The resultant residue was purified on 10 g silica gel column chromatography (eluent, chloroform→chloroform:methanol=50:1) to provide 0.011 g (yield: 41%) of the crystalline title compound.

¹H-NMR (CDCl₃) δ: 7.93 (d, J=5.4 Hz, 1H), 7.42-7.35 (m, 5H), 7.29-7.26 (m, 3H), 7.06-7.02 (m, 2H), 6.20 (dd, J=1.5 Hz, 5.4 Hz, 1H), 6.05 (bs, 1H), 4.39 (bs, 2H), 3.79 (s, 2H)

Mass, m/e: 388 (M⁺), 91 (base)

In the following, the compounds of Examples 190-193 were synthesized in the manner similar to Example 189.

Example 190
4-[4-(2-Aminopyridyl)]-5-[2-(2-chlorophenyl)acetylamino]-3-(4-fluorophenyl)isoxazole

¹H-NMR (CDCl₃) δ: 7.93 (d, J=5.4 Hz, 1H), 7.44-7.40 (m, 3H), 7.35-7.28 (m, 3H), 7.26-23 (m, 1H), 7.07-7.02 (m, 2H), 6.28 (dd, J=1.5 Hz, 5.4 Hz, 1H), 6.21 (bs, 1H), 4.53 (bs, 2H), 3.89 (s, 2H)

Mass, m/e: 422 (M⁺), 125 (base)

Example 191
4-[4-(2-Aminopyridyl)]-5-[2-(2,6-dichlorophenyl)acetylamino]-3-(4-fluorophenyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 11.03 (bs, 1H), 7.88 (d, J=5.4 Hz, 1H), 7.49-7.46 (m, 4H), 7.36-7.28 (m, 3H), 6.32 (dd, J=1.5 Hz, 5.4 Hz, 1H), 6.21 (bs, 1H), 5.93 (bs, 2H), 4.04 (s, 2H)

Mass, m/e: 456 (M⁺), 159 (base)

Example 192
4-[4-(2-Aminopyridyl)]-5-[2-(2,4-dichlorophenyl)acetylamino]-3-(4-fluorophenyl)isoxazole

¹H-NMR (CDCl₃) δ: 7.96 (d, J=5.4 Hz, 1H), 7.45-7.41 (m, 3H), 7.25 (bs, 3H), 7.05 (t, J=8.9 Hz, 2H), 6.31 (dd, J=1.5 Hz, 5.4 Hz, 1H), 6.22 (bs, 1H), 4.48 (bs, 2H), 3.86 (s, 2H)

Mass, m/e: 456 (M⁺), 159 (base)

Example 193
4-[4-(2-Aminopyridyl)]-3-(4-fluorophenyl)-5-[2-methyl-2-phenyl-(acetylamino)]isoxazole

¹H-NMR (CDCl₃) δ: 7.87 (d, J=5.4 Hz, 1H), 7.41-7.27 (m, 8H), 7.04 (t, J=8.9 Hz, 2H), 6.13 (d, J=5.4 Hz, 1H), 5.96 (bs, 1H), 4.50 (bs, 2H), 3.81-3.74 (m, 1H), 1.57 and 1.55 (s, 3H)

Mass, m/e: 402 (M⁺), 105 (base)

Example 194
4-[4-(2-Dimethylaminopyridyl)]-3-(4-fluorophenyl)-5-(phenylacetyl-amino)isoxazole

A mixture of 80 mg of 4-[4-(2-bromopyridyl)]-3-(4-fluoro-phenyl)-5-(phenylacetylamino)isoxazole and 0.3 mL of HMPA was stirred at 200° C. for 50 minutes. The solvent was distilled off from the reaction solution under reduced pressure. The resultant residue was purified on thin-layer chromatography (developer, chloroform:methanol=100:1) to provide 2 mg (yield: 3%) of the title compound.

¹H-NMR (CDCl₃) δ:

8.05 (d, J=5.7 Hz, 1H), 7.53-6.93 (m, 10H), 6.13-6.07 (m, 2H), 3.77 (s, 2H), 2.95 (s, 6H)

Mass, m/e: 416 (M⁺), 91 (base)

Example 195
4-[4-(2-Dimethylaminopyridyl)]-3-(4-fluorophenyl)-5-[2-methyl-2-phenyl(acetylamino)] isoxazole

The title compound was synthesized in the manner similar to Example 194.

¹H-NMR (CDCl₃) δ: 8.01 (dd, J=0.8 Hz, 5.0 Hz, 1H), 7.45-7.40 (m, 2H), 7.37-7.31 (m, 4H), 7.26-7.22 (m, 2H), 7.05-7.00 (m, 2H), 6.06 (bs, 1H), 6.03 (dd, J=1.2 Hz, 5.0 Hz, 1H), 3.79 (bs, 1H), 2.93 (s, 6H), 1.54 (d, J=7.3 Hz, 3H)

Mass, m/e: 430 (M⁺), 105 (base)

Example 196
5-[(2-Chlorophenyl)acetylamino]-3-(4-fluorophenyl)-4-[4-(2-methylpyridyl)]isoxazole
a) 4-Chloromethyl-2-methylpyridine

Into 100 mL of methylene chloride solution containing 2.16 g of 4-(2-methylpyridyl)methanol (cf. PCT International Publication WO98/21210 Pamphlet), 23 mL of thionyl chloride was dropped at room temperature, followed by 20 hours' stirring at room temperature. The solvent was distilled off from the reaction solution under reduced pressure, and the residue was extracted with methylene chloride, after addition of saturated aqueous NaHCO₃solution. The methylene chloride extract was dried over anhydrous magnesium sulfate, and from which the solvent was distilled off under reduced pressure to provide 2.46 g (yield: 100%) of brown crystalline title compound.

¹H-NMR (CDCl₃) δ: 8.45 (d, J=5.0 Hz, 1H), 7.31 (s, 1H), 7.25 (d, J=5.0 Hz, 1H), 4.74 (s, 2H), 2.48 (s, 3H)

Mass, m/e: 141 (M⁺, base)

b) 4-(2-Methylpyridyl)acetonitrile

To 10 mL of DMSO solution containing 1.7 g of sodium cyanide, 3 mL of DMSO solution containing 2.46 g of 4-chloromethyl-2-methylpyridine was added under cooling with ice, and stirred at room temperature for 3 hours. After addition of water, the reaction solution was extracted with ethyl acetate. The ethyl acetate extract was washed with water, dried over anhydrous magnesium sulfate and removed of the solvent by reduced pressure distillation to provide 1.86 g (yield: 80%) of the title compound which was a reddish brown, oily substance.

¹H-NMR (CDCl₃) δ: 8.43 (d, J=5.0 Hz, 1H), 7.22 (s, 1H), 7.16 (d, J=5.0 Hz, 1H), 4.08 (s, 2H), 2.47 (s, 3H)

Mass, m/e: 132 (M⁺, base)

c) 5-Amino-3-(4-fluorophenyl)-4-[4-(2-methylpyridyl)]isoxazole

To 3.3 mL of 28% sodium methoxide-methanol solution, 15 mL of methanol and 15 mL of THF solution containing 1.86 g of 4-(2-methylpyridyl)acetonitrile were added and stirred at room temperature for 30 minutes. Then 15 mL of a methanol solution containing 2.9 g of 4-fluorobenzhydroxymoyl chloride was added, followed by 30 minutes' stirring at room temperature. The solvent was distilled off from the reaction solution under reduced pressure, and the residue was extracted with a mixed solvent of chloroform:methanol=1:1, after addition of water. The organic layer was dried over anhydrous magnesium sulfate and removed of the solvent by reduced pressure distillation. The resultant residue was purified on 100 g silica gel column chromatography (eluent, chloroform:methanol=100:1→20:1) to provide 0.955 g (yield: 25%) of the title compound as reddish brown crystals.

¹H-NMR (CDCl₃) δ: 8.41 (d, J=5.2 Hz, 1H), 7.32 (dd, J=5.4 Hz, 8.6 Hz, 2H), 7.05 (t, J=8.6 Hz, 2H), 6.93 (bs, 1H), 6.83 (dd, J=1.5 Hz, 5.2 Hz, 1H), 4.80 (bs, 2H), 2.50 (s, 3H)

Mass, m/e: 269 (M⁺, base)

d) 5-[(2-Chlorophenyl)acetylamino]-3-(4-fluorophenyl)-4-[4-(2-methylpyridyl)]isoxazole

To 5 mL of THF solution containing 0.21 g of 2-chlorophenyl-acetic acid, 0.2 g of CDI was added and stirred at room temperature for an hour. Then 10 mL of THF solution containing 0.1 g of 5-amino-3-(4-fluorophenyl)-4-[4-(2-methylpyridyl)]isoxazole and 0.4 mL of DBU were added and stirred for 12 hours. After distilling the solvent off from the reaction solution under reduced pressure, water was added to the residue, followed by extraction with ethyl acetate. The ethyl acetate extract was dried over anhydrous magnesium sulfate and from which the solvent was distilled off under reduced pressure. The resultant residue was purified on 15 g silica gel column chromatography (eluent, chloroform:methanol=100:1) to provide 0.12 g (yield: 77%) of the colorless crystalline title compound.

¹H-NMR (CDCl₃) δ: 8.38 (d, J=5.2 Hz, 1H), 7.55 (bs, 1H), 7.44-7.42 (m, 1H), 7.38-7.28 (m, 5H), 7.04 (t, J=8.4 Hz, 2H), 6.87 (s, 1H), 6.77 (dd, J=1.1 Hz, 5.2 Hz, 1H), 3.87 (s, 2H), 2.47 (s, 3H)

Mass, m/e: 421 (M⁺), 125 (base)

Example 197
3-(4-Fluorophenyl)-4-[4-(2-methylpyridyl)]-5-(3-phenylpropionyl-amino)isoxazole

The title compound was synthesized in the manner similar to Example 196.

¹H-NMR (CDCl₃) δ: 8.38 (d, J=5.0 Hz, 1H), 7.66 (bs, 1H), 7.35 (dd, J=5.3 Hz, 8.6 Hz, 2H), 7.29-7.16 (m, 5H), 7.03 (t, J=8.6 Hz, 2H), 6.86 (s, 1H), 6.78 (d, J=5.0 Hz, 1H), 3.00 (t, J=7.3 Hz, 2H), 2.75 (t, J=7.3 Hz, 2H), 2.46 (s, 3H)

Mass, m/e: 401 (M⁺), 91 (base)

Example 198
4-[4-(2,6-Dimethylpyridyl)]-3-(4-fluorophenyl)-5-phenylacetylamino-isoxazole
a) 4-Chloromethyl-2,6-dimethylpyridine

To 45 mL of methylene chloride solution containing 1.0 g of 4-(2,6-dimethylpyridyl)methanol (cf. PCT International Publication WO98/21210 Pamphlet), thionyl chloride was added dropwise at room temperature, followed by 21 hours' stirring. The solvent was distilled off from the reaction solution under reduced pressure, and to the residue saturated aqueous NaHCO₃solution was added, followed by extraction with methylene chloride. The organic layer was dried over anhydrous magnesium sulfate and removed of the solvent by reduced pressure distillation to provide 1.0 g (yield: 88%) of the title compound as a yellow oily substance.

¹H-NMR (CDCl₃) δ: 6.95 (s, 2H), 4.43 (s, 2H), 2.50 (s, 6H) Mass, m/e: 155 (M⁺, base)

b) 4-(2,6-Dimethylpyridyl)acetonitrile

To 4 mL of DMSO solution containing 0.63 g of sodium cyanide, 1 mL of DMSO solution containing 1.00 g of 4-chloromethyl-2,6-dimethylpyridine was added under cooling with ice, and stirred at room temperature for 2 hours. Water was added to the reaction solution which was then extracted with ethyl acetate. The ethyl acetate extract was washed with water, dried over anhydrous magnesium sulfate and removed of the solvent by reduced pressure distillation to provide 0.86 g (yield: 92%) of the title compound as a reddish brown, oily substance.

¹H-NMR (CDCl₃) δ: 7.01 (s, 2H), 4.02 (s, 2H), 2.49 (s, 6H)

Mass, m/e: 146 (M⁺, base)

c) 5-Amino-4-[4-(2,6-dimethylpyridyl)]-3-(4-fluorophenyl)isoxazole

To 1.4 mL of 28% sodium methoxide-methanol solution, 7 mL of THF solution containing 0.86 g of 4-(2,6-dimethylpyridyl)-acetonitrile was added and stirred at room temperature for 20 minutes. Then 7 mL of methanol solution containing 1.23 g of 4-fluorobenzhydroxymoyl chloride was added and stirred at room temperature for 13 hours. The solvent was distilled off from the reaction solution under reduced pressure, and water was added to the residue, followed by extraction with chloroform. The organic layer was dried over anhydrous magnesium sulfate and removed of the solvent by reduced pressure distillation. The resultant residue was purified on 80 g silica gel column chromatography (eluent, chloroform:methanol=100:1→40:1) to provide 0.425 g (yield: 25%) of reddish brown, crystalline title compound.

¹H-NMR (CDCl₃) δ: 7.41 (dd, J=5.4 Hz, 8.4 Hz, 2H), 7.04 (t, J=8.4 Hz, 2H), 6.72 (s, 2H), 4.78 (bs, 2H), 2.45 (s, 6H)

Mass, m/e: 283 (M⁺, base)

d) 4-[4-(2,6-Dimethylpyridyl)]-3-(4-fluorophenyl)-5-phenylacetyl-aminoisoxazole

To 8 mL of THF solution containing 90 mg of imidazole and 0.4 mL of DBU, 0.16 mL of phenylacetyl chloride was added under cooling with ice, and stirred for an hour at room temperature. Then 8 mL of THF solution containing 0.1 g of 5-amino-4-[4-(2,6-dimethylpyridyl)]-3-(4-fluorophenyl)isoxazole was added, followed by 3 days' stirring. The solvent was distilled off from the reaction solution under reduced pressure, and to the resultant residue water was added, followed by extraction with ethyl acetate. The ethyl acetate extract was dried over anhydrous magnesium sulfate and removed of the solvent by reduced pressure distillation. The resultant residue was purified on 15 g silica gel column chromatography (eluent, chloroform:methanol=100:1) and then on thin-layer chromatography (developer, chloroform:methanol=100:1) to provide 53 mg (yield: 37%) of yellow crystalline title compound,

¹H-NMR (CDCl₃) δ: 7.38-7.23 (m, 8H), 7.03 (t, J=8.4 Hz, 2H), 6.56 (s, 2H), 3.76 (s, 2H), 2.42 (s, 6H)

Mass, m/e: 401 (M⁺), 91(base)

In the following, the compounds of Examples 199-200 were synthesized in the manner similar to Example 198.

Example 199
5-[(2-Chlorophenyl)acetylamino]-4-[4-(2,6-dimethylpyridyl)]-3-(4-fluorophenyl)isoxazole

¹H-NMR (DMSO-d₆) δ: 11.02 (bs, 1H), 7.45-7.42 (m, 3H), 7.39-7.36 (s, 1H), 7.33-7.27 (m, 4H), 6.82 (s, 2H), 3.86 (s, 2H), 2.35 (s, 6H)

Mass, m/e: 435 (M⁺), 125 (base)

Example 200
4-[4-(2,6-Dimethylpyridyl)]-3-(4-fluorophenyl)-5-(3-phenylpropionyl-amino)isoxazole

¹H-NMR (CDCl₃) δ: 7.40 (bs, 1H), 7.37 (dd, J=5.3 Hz, 8.8 Hz, 2H), 7.29-7.27 (m, 2H), 7.22-7.16 (m, 3H), 7.03 (t, J=8.8 Hz, 2H), 6.69 (s, 2H), 3.00 (t, J=7.3 Hz, 2H), 2.76 (m, 2H), 2.46 (s, 6H)

Mass, m/e: 415 (M⁺), 91 (base)

Formulation Example 1

Tablet:

mg/tablet

Active ingredient
5.0

Starch
10.0

Lactose
73.0

Carboxymethyl cellulose calcium
10.0

Talc
1.0

Magnesium stearate
1.0

100.0

The active ingredient is pulverized to a grain size not greater than 70 μm, and to which starch, lactose and carboxymethyl cellulose calcium are added and thoroughly mixed. Ten (10) % starch paste is added to the mixture, mixed by stirring and granulated. After drying, the granules are dressed to around 1000 μm in particle size. Mixing talc and magnesium stearate therewith, the blend is tabletted.

Pyridylisoxazole Derivatives

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