WO2004092140A1 - Biaryl substituted pyrazoles as sodium channel blockers - Google Patents
Biaryl substituted pyrazoles as sodium channel blockers Download PDFInfo
- Publication number
- WO2004092140A1 WO2004092140A1 PCT/US2004/009713 US2004009713W WO2004092140A1 WO 2004092140 A1 WO2004092140 A1 WO 2004092140A1 US 2004009713 W US2004009713 W US 2004009713W WO 2004092140 A1 WO2004092140 A1 WO 2004092140A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- alkyl
- pharmaceutically acceptable
- aryl
- acceptable salt
- 4alkyl
- Prior art date
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- 239000003195 sodium channel blocking agent Substances 0.000 title abstract description 13
- 150000003217 pyrazoles Chemical class 0.000 title description 6
- 125000005841 biaryl group Chemical group 0.000 title 1
- 150000001875 compounds Chemical class 0.000 claims abstract description 141
- -1 Biaryl substituted pyrazole compounds Chemical class 0.000 claims abstract description 74
- 238000000034 method Methods 0.000 claims abstract description 43
- 238000011282 treatment Methods 0.000 claims abstract description 38
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- 208000009935 visceral pain Diseases 0.000 claims abstract description 5
- 150000003839 salts Chemical class 0.000 claims description 78
- 125000000217 alkyl group Chemical group 0.000 claims description 64
- 125000003118 aryl group Chemical group 0.000 claims description 55
- 229910003827 NRaRb Inorganic materials 0.000 claims description 50
- 201000006417 multiple sclerosis Diseases 0.000 claims description 46
- 125000001424 substituent group Chemical group 0.000 claims description 41
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 36
- 125000002541 furyl group Chemical group 0.000 claims description 33
- 125000001715 oxadiazolyl group Chemical group 0.000 claims description 33
- 125000002971 oxazolyl group Chemical group 0.000 claims description 33
- 125000003226 pyrazolyl group Chemical group 0.000 claims description 33
- 125000004076 pyridyl group Chemical group 0.000 claims description 33
- 125000000714 pyrimidinyl group Chemical group 0.000 claims description 33
- 125000000335 thiazolyl group Chemical group 0.000 claims description 33
- 125000001544 thienyl group Chemical group 0.000 claims description 33
- 125000001425 triazolyl group Chemical group 0.000 claims description 33
- 229910052794 bromium Inorganic materials 0.000 claims description 24
- 229910052740 iodine Inorganic materials 0.000 claims description 23
- MDFFNEOEWAXZRQ-UHFFFAOYSA-N aminyl Chemical compound [NH2] MDFFNEOEWAXZRQ-UHFFFAOYSA-N 0.000 claims description 19
- 125000000168 pyrrolyl group Chemical group 0.000 claims description 18
- 125000002883 imidazolyl group Chemical group 0.000 claims description 17
- 125000000842 isoxazolyl group Chemical group 0.000 claims description 17
- 125000003373 pyrazinyl group Chemical group 0.000 claims description 17
- 125000003831 tetrazolyl group Chemical group 0.000 claims description 17
- 125000004178 (C1-C4) alkyl group Chemical group 0.000 claims description 15
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- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 claims description 8
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- SFLSHLFXELFNJZ-QMMMGPOBSA-N (-)-norepinephrine Chemical compound NC[C@H](O)C1=CC=C(O)C(O)=C1 SFLSHLFXELFNJZ-QMMMGPOBSA-N 0.000 claims description 3
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- 125000003785 benzimidazolyl group Chemical group N1=C(NC2=C1C=CC=C2)* 0.000 claims description 3
- 125000004618 benzofuryl group Chemical group O1C(=CC2=C1C=CC=C2)* 0.000 claims description 3
- 125000001164 benzothiazolyl group Chemical group S1C(=NC2=C1C=CC=C2)* 0.000 claims description 3
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Classifications
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Definitions
- the present invention is directed to a series of biaryl substituted pyrazole compounds.
- this invention is directed to biaryl substituted pyrazole compounds that are sodium channel blockers useful for the treatment of chronic and neuropathic pain.
- the compounds of the present invention are also useful for the treatment of other conditions, including, for example, central nervous system (CNS) disorders such as epilepsy, manic depression, bipolar disorder, depression, anxiety and diabetic neuropathy.
- CNS central nervous system
- Voltage-gated ion channels allow electrically excitable cells to generate and propagate action potentials and therefore are crucial for nerve and muscle function.
- Sodium channels play a special role by mediating rapid depolarization, which constitutes the rising phase of the action potential and in turn activates voltage-gated calcium and potassium channels.
- Voltage-gated sodium channels represent a multigene family. Nine sodium channel subtypes have been cloned and functionally expressed to date. [Clare, J. J., Tate, S. N., Nobbs, M. & Romanos, M. A. Voltage-gated sodium channels as therapeutic targets. Drug Discovery Today 5, 506-520 (2000)]. They are differentially expressed throughout muscle and nerve tissues and show distinct biophysical properties.
- All voltage-gated sodium channels are characterized by a high degree of selectivity for sodium over other ions and by their voltage-dependent gating. [Catterall, W. A. Structure and function of voltage-gated sodium and calcium channels. Current Opinion in Neurobiology 1, 5-13 (1991)].
- sodium channels are closed. Following membrane depolarization, sodium channels open rapidly and then inactivate. Sodium channels only conduct currents in the open state and, once inactivated, have to return to the resting state, favored by membrane hyperpolarization, before they can reopen.
- Different sodium channel subtypes vary in the voltage range over which they activate and inactivate as well as in their activation and inactivation kinetics.
- Sodium channels are the target of a diverse array of pharmacological agents, including neurotoxins, antiarrhythmics, anticonvulsants and local anesthetics. [Clare, J. J., Tate, S. N., Nobbs, M. & Romanos, M. A. Voltage-gated sodium channels as therapeutic targets. Drug Discovery Today 5, 506- 520 (2000)].
- Several regions in the sodium channel secondary structure are involved in interactions with these blockers and most are highly conserved. Indeed, most sodium channel blockers known to date interact with similar potency with all channel subtypes. Nevertheless, it has been possible to produce sodium channel blockers with therapeutic selectivity and a sufficient therapeutic window for the treatment of epilepsy (e.g. lamotrigine, phenytoin and carbamazepine) and certain cardiac arrhythmias (e.g. lignocaine, tocainide and mexiletine).
- epilepsy e.g. lamotrigine, phenytoin and carbamazepin
- neuropathic pain include, but are not limited to, postherpetic neuralgia, trigeminal neuralgia, diabetic neuropathy, chronic lower back pain, phantom limb pain, pain resulting from cancer and chemotherapy, chronic pelvic pain, complex regional pain syndrome and related neuralgias. It has been shown in human patients as well as in animal models of neuropathic pain, that damage to primary afferent sensory neurons can lead to neuroma formation and spontaneous activity, as well as evoked activity in response to normally innocuous stimuli. [Carter, G.T. and B.S.
- Galer Advances in the management of neuropathic pain. Physical Medicine and Rehabilitation Clinics of North America, 2001. 12(2): p. 447-459].
- the ectopic activity of normally silent sensory neurons is thought to contribute to the generation and maintenance of neuropathic pain.
- Neuropathic pain is generally assumed to be associated with an increase in sodium channel activity in the injured nerve. [Baker, M.D. and J.N. Wood, Involvement ofNa channels in pain pathways. TRENDS in Pharmacological Sciences, 2001. 22(1): p. 27-31].
- Lidoderm ® lidocaine applied in the form of a dermal patch, is currently the only FDA approved treatment for PHN. [Devers, A. and B.S. Galer, Topical lidocaine patch relieves a variety of neuropathic pain conditions: an open- label study. Clinical Journal of Pain, 2000. 16(3): p. 205-208].
- sodium channel blockers In addition to neuropathic pain, sodium channel blockers have clinical uses in the treatment of epilepsy and cardiac arrhythmias. Recent evidence from animal models suggests that sodium channel blockers may also be useful for neuroprotection under ischaemic conditions caused by stroke or neural trauma and in patients with multiple sclerosis (MS). [Clare, J. J. et. al. And Anger, T. et. al.]. International Patent Publication WO 00/57877 describes aryl substituted pyrazoles, imidazoles, oxazoles, thiazoles, and pyrroles and their uses as sodium channel blockers.
- the present invention is directed to biaryl pyrazole compounds which are sodium channel blockers useful for the treatment of chronic and neuropathic pain.
- the compounds of the present invention are also useful for the treatment of other conditions, including CNS disorders such as epilepsy, manic depression, anxiety, depression and bipolar disorder.
- This invention provides pharmaceutical compositions comprising a compound of the present invention, either alone, or in combination with one or more therapeutically active compounds, and a pharmaceutically acceptable carrier.
- This invention further comprises methods for the treatment of conditions associated with, or resulting from, sodium channel activity, such as acute pain, chronic pain, visceral pain, inflammatory pain, neuropathic pain and disorders of the CNS including, but not limited to, epilepsy, manic depression, anxiety, depression and bipolar disorder.
- HET is one of the following heterocycles:
- R a is (a) H
- Cp -alkyl optionally substituted with one or more of the following substituents: F, CF 3 , OH, 0-(Cr C 4 )alkyl, S(O) 0 . 2 -(C C 4 )alkyl, -OCONH 2 , -OCONH(C C 4 alkyl), -OCON(CrC 4 alkyl)(C C 4 alkyl), - OCONHC C 4 alkyl-aryl), -OCON(C r C 4 alkyl)(C C 4 alkyl-aryl), NH 2 , NH(C C 4 alkyl), N(Q- C 4 alkyl)(C C 4 alkyl), NH(C C 4 alkyl-aryl), N(C 1 -C 4 alkyl)(C 1 -C 4 alkyl-aryl), NHCONH 2 , NHCONH(C r C 4 alkyl), NHCONH(C 1 -C 4 alkyl
- aryl is phenyl, pyridyl, pyrimidinyl, furyl, thienyl, pyrrolyl, triazolyl, pyrazolyl, thiazolyl, isoxazolyl, oxazolyl, or oxadiazolyl, any aryl of which is optionally substituted with 1-3 substituents selected from i) F, CI, Br, I, ii) -CN, iii) -N ⁇ 2, iv) v)
- R b is
- R 2 is: (a) H
- R 3 is (a) H; (b) -C C 4 -alkyl, -C 3 -C 6 -cycloalkyl or -C C -alkyl-(C 3 -C 6 )-cycloalkyl, optionally substituted with one or more of the following substituents: F, CF 3 , OH, 0-(C C 4 )alkyl, S(O) 0 .
- R , R and R each independently is:
- R ⁇ xi) -S ⁇ 2N(R a )(R b ), xii) -NR a S02R a , xiii) -Ci-iQalkyl, and xiv) -Ci-ifjalkyl, wherein one or more of the alkyl carbons can be replaced by a -NR a -, - 0-, -S(0), -2 -, -O-C(O)-, -C(0)-0-, -C(0)-N(R a )-, -N(R a )-C(0)-, - N(R a )-C(0)-N(R a )-, -C(O)-, -CH(OH)-, -C C-, or -C ⁇ C; or when R6 and R7 are present on adjacent carbon atoms, R6 and R7> together with the ring to which they are attached, may form a bicyclic aromatic
- R 6 is other than H and is attached at the ortho position.
- the present invention provides a compound described by the chemical Formula (II), or a pharmaceutically acceptable salt thereof, wherein
- R 6 is other than H and is attached at the ortho position.
- the present invention provides a compound described by the chemical Formula (III), or a pharmaceutically acceptable salt thereof, wherein
- R 6 is other than H and is attached at the ortho position.
- the present invention provides a compound described by the chemical Formula (III), or a pharmaceutically acceptable salt thereof, wherein
- the present invention provides a compound described by the chemical Formula (III), or a pharmaceutically acceptable salt thereof, wherein
- the present invention provides a compound described by the chemical Formula (III), or a pharmaceutically acceptable salt thereof, wherein
- the present invention provides a compound described by the chemical Fonnula (III), or a pharmaceutically acceptable salt thereof, wherein
- the present invention provides a compound described by the chemical Formula (III), or a pharmaceutically acceptable salt thereof, wherein
- the present invention provides a compound described by the chemical Formula (IN), or a pharmaceutically acceptable salt thereof, wherein R 6 is other than H and is attached at the ortho position.
- the present invention provides a compound described by the chemical Formula (IV), or a pharmaceutically acceptable salt thereof, wherein
- the present invention provides a compound described by the chemical Formula (IV), or a pharmaceutically acceptable salt thereof, wherein
- the present invention provides a compound described by the chemical Formula (IV), or a pharmaceutically acceptable salt thereof, wherein
- the present invention provides a compound described by the chemical Formula (IV), or a pharmaceutically acceptable salt thereof, wherein HET is
- the present invention provides a compound described by the chemical Formula (IV), or a pharmaceutically acceptable salt thereof, wherein
- alkyl as well as other groups having the prefix “alk” such as, for example, alkoxy, alkanoyl, alkenyl, and alkynyl means carbon chains which may be linear or branched or combinations thereof.
- alkyl groups include methyl, ethyl, propyl, isopropyl, butyl, sec- and tert-butyl, pentyl, hexyl, and heptyl.
- alkenyl alkynyl and other like terms include carbon chains containing at least one unsaturated C-C bond.
- cycloalkyl means carbocycles containing no heteroatoms, and includes mono- , bi- and tricyclic saturated carbocycles, as well as fused ring systems.
- fused ring systems can include one ring that is partially or fully unsaturated such as a benzene ring to form fused ring systems such as benzofused carbocycles.
- Cycloalkyl includes such fused ring systems as spirofused ring systems.
- cycloalkyl examples include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, decahydronaphthalene, adamantane, indanyl, indenyl, fluorenyl, and 1,2,3,4-tetrahydronaphalene.
- cycloalkenyl means carbocycles containing no heteroatoms and at least one non-aromatic C-C double bond, and include mono-, bi- and tricyclic partially saturated carbocycles, as well as benzofused cycloalkenes.
- Examples of cycloalkenyl examples include cyclohexenyl, and indenyl.
- aryl includes, but is not limited to, an aromatic substituent that is a single ring or multiple rings fused together. When formed of multiple rings, at least one of the constituent rings is aromatic.
- aryl also includes heteroaryls, and thus includes stable 5- to 7-membered monocyclic and stable 9- to 10-membered fused bicyclic heterocyclic ring systems that consist of carbon atoms and from one to four heteroatoms selected from the group consisting of N, O and S, wherein the nitrogen and sulfur heteroatoms may optionally be oxidized, and the nitrogen heteroatom may optionally be quaternized.
- Suitable aryl groups include phenyl, naphthyl, pyridyl, pyrimidinyl, furyl, thienyl, pyrrolyl, triazolyl, pyrazolyl, thiazolyl, isoxazolyl, oxazolyl, and oxadiazolyl.
- cycloalkyloxy includes a cycloalkyl group connected by a short C ⁇ -2alkyl to the oxy connecting atom.
- C ⁇ -6alkyl includes alkyls containing 6, 5, 4, 3, 2, 1, or no carbon atoms.
- An alkyl with no carbon atoms is a hydrogen atom substituent when the alkyl is a terminal group and is a direct bond when the alkyl is a bridging group.
- hetero includes one or more O, S, or N atoms.
- heterocycloalkyl and heteroaryl include ring systems that contain one or more O, S, or N atoms in the ring, including mixtures of such atoms.
- the hetero atoms replace ring carbon atoms.
- a heterocycloCsalkyl is a Five-member ring containing from 4 to no carbon atoms.
- heteroaryls include pyridinyl, quinolinyl, isoquinolinyl, pyridazinyl, pyrimidinyl, pyrazinyl, quinoxalinyl, furyl, benzofuryl, dibenzofuryl, thienyl, benzthienyl, pyrrolyl, indolyl, pyrazolyl, indazolyl, oxazolyl, benzoxazolyl, isoxazolyl, thiazolyl, benzothiazolyl, isothiazolyl, imidazolyl, benzimidazolyl, oxadiazolyl, thiadiazolyl, triazolyl, and tetrazolyl.
- heterocycloalkyls examples include azetidinyl, pyrrolidinyl, piperidinyl, piperazinyl, morpholinyl, tetrahydrofuranyl, imidazolinyl, pyrolidin-2-one, piperidin-2-one, and thiomorpholinyl.
- heteroC ⁇ - alkyl means a heteroalkyl containing 3, 2, 1, or no carbon atoms. However, at least one heteroatom must be present. Thus, as an example, a heteroC()-4alkyl having no carbon atoms but one N atom would be a -NH- if a bridging group and a -NH2 if a terminal group. Analogous bridging or terminal groups are clear for an O or S heteroatom.
- amine unless specifically stated otherwise, includes primary, secondary and tertiary amines.
- carbonyl unless specifically stated otherwise, includes a C ⁇ -6alkyl substituent group when the carbonyl is terminal.
- halogen includes fluorine, chlorine, bromine and iodine atoms.
- optionally substituted is intended to include both substituted and unsubstituted.
- optionally substituted aryl could represent a pentafluorophenyl or a phenyl ring.
- optionally substituted multiple moieties such as, for example, alkylaryl are intended to mean that the alkyl and the aryl groups are optionally substituted.
- Compounds described herein can contain one or more asymmetric centers and may thus give rise to diastereoisomers and optical isomers.
- the present invention includes all such possible diastereoisomers as well as their racemic mixtures, their substantially pure resolved enantiomers, all possible geometric isomers, and pharmaceutically acceptable salts thereof.
- the above chemical Formulas are shown without a definitive stereochemistry at certain positions.
- the present invention includes all stereoisomers of the chemical Formulas and pharmaceutically acceptable salts thereof. Further, mixtures of stereoisomers as well as isolated specific stereoisomers are also included. During the course of the synthetic procedures used to prepare such compounds, or in using racemization or epimerization procedures known to those skilled in the art, the products of such procedures can be a mixture of stereoisomers.
- salts refers to salts prepared from pharmaceutically acceptable non-toxic bases or acids.
- pharmaceutically acceptable non-toxic bases including inorganic bases and organic bases.
- Salts derived from such inorganic bases include aluminum, ammonium, calcium, copper (ic and ous), ferric, ferrous, lithium, magnesium, manganese (ic and ous), potassium, sodium, zinc and the like salts.
- Salts derived from pharmaceutically acceptable organic non-toxic bases include salts of primary, secondary, and tertiary amines, as well as cyclic amines and substituted amines such as naturally occurring and synthesized substituted amines.
- organic non-toxic bases from which salts can be formed include ion exchange resins such as, for example, arginine, betaine, caffeine, choline, N,N -dibenzylethylenediamine, diethylamine, 2-diethylaminoethanol, 2-dimethylaminoethanol, ethanolamine, ethylenediamine, N- ethylmorpholine, N-ethylpiperidine, glucamine, glucosamine, histidine, hydrabamine, isopropylamine, lysine, methylglucamine, morpholine, piperazine, piperidine, polyamine resins, procaine, purines, theobromine, triethylamine, trimethylamine, tripropylamine, and tromethamine.
- ion exchange resins such as, for example, arginine, betaine, caffeine, choline, N,N -dibenzylethylenediamine, diethylamine, 2-dieth
- the compound of the present invention When the compound of the present invention is basic, its corresponding salt can be conveniently prepared from pharmaceutically acceptable non-toxic acids, including inorganic and organic acids.
- acids include, for example, acetic, benzenesulfonic, benzoic, camphorsulfonic, citric, ethanesulfonic, fumaric, gluconic, glutamic, hydrobromic, hydrochloric, isethionic, lactic, maleic, malic, mandelic, methanesulfonic, mucic, nitric, pamoic, pantothenic, phosphoric, succinic, sulfuric, tartaric, p- toluenesulfonic acid and the like.
- compositions of the present invention comprise a compound represented by Formula I, II, III or IV (or pharmaceutically acceptable salts thereof) as an active ingredient, a pharmaceutically acceptable carrier, and optionally one or more additional therapeutic agents or adjuvants.
- additional therapeutic agents can include, for example, i) opiate agonists or antagonists, ii) calcium channel antagonists, iii) 5HT receptor agonists or antagonists iv) sodium channel antagonists, v) NMDA receptor agonists or antagonists, vi) COX-2 selective inhibitors, vii) NK1 antagonists, viii) non-steroidal anti-inflammatory drugs ("NSAID”), ix) selective serotonin reuptake inhibitors ("SSRI”) and/or selective serotonin and norepinephrine reuptake inhibitors (“SSNRI”), x) tricyclic antidepressant drugs, xi) norepinephrine modulators, xii) lithium, xiii) valproate, and x
- compositions suitable for oral, rectal, topical, and parenteral (including subcutaneous, intramuscular, and intravenous) administration although the most suitable route in any given case will depend on the particular host, and nature and severity of the conditions for which the active ingredient is being administered.
- the pharmaceutical compositions may be conveniently presented in unit dosage form and prepared by any of the methods well known in the art of pharmacy.
- the present compounds and compositions are useful for the treatment of chronic, visceral, inflammatory and neuropathic pain syndromes. They are useful for the treatment of pain resulting from traumatic nerve injury, nerve compression or entrapment, postherpetic neuralgia, trigeminal neuralgia, and diabetic neuropathy.
- the present compounds and compositions are also useful for the treatment of chronic lower back pain, phantom limb pain, chronic pelvic pain, neuroma pain, complex regional pain syndrome, chronic arthritic pain and related neuralgias, and pain associated with cancer, chemotherapy, HTV and HTV treatment-induced neuropathy.
- Compounds of this invention may also be utilized as local anesthetics.
- Compounds of this invention are useful for the treatment of irritable bowel syndrome and related disorders, as well as Crohns disease.
- the instant compounds have clinical uses for the treatment of epilepsy and partial and generalized tonic seizures. They are also useful for neuroprotection under ischaemic conditions caused by stroke or neural trauma and for treating multiple sclerosis.
- the present compounds are useful for the treatment of tacliy-arrhythmias.
- the instant compounds are useful for the treatment of neuropsychiatric disorders, including mood disorders, such as depression or more particularly depressive disorders, for example, single episodic or recurrent major depressive disorders and dysthymic disorders, or bipolar disorders, for example, bipolar I disorder, bipolar II disorder and cyclothymic disorder; anxiety disorders, such as panic disorder with or without agoraphobia, agoraphobia without history of panic disorder, specific phobias, for example, specific animal phobias, social phobias, obsessive-compulsive disorder, stress disorders including post-traumatic stress disorder and acute stress disorder, and generalised anxiety disorders.
- mood disorders such as depression or more particularly depressive disorders, for example, single episodic or recurrent major depressive disorders and dysthymic disorders
- bipolar disorders for example, bipolar I disorder, bipolar II disorder and cyclothymic disorder
- anxiety disorders such as panic disorder with or without agoraphobia, agoraphobia without history of panic disorder, specific phobias, for example, specific animal phobias, social phobia
- a compound of the present invention may be used in conjunction with other anti-depressant or anti-anxiety agents, such as norepinephrine reuptake inhibitors, selective serotonin reuptake inhibitors (SSRIs), monoamine oxidase inhibitors (MAOIs), reversible inhibitors of monoamine oxidase (RIMAs), serotonin and noradrenaline reuptake inhibitors (SNRIs), ⁇ -adrenoreceptor antagonists, atypical anti-depressants, benzodiazepines, 5-HT 1A agonists or antagonists, especially 5-HT ⁇ A partial agonists, neurokinin-1 receptor antagonists, corticotropin releasing factor (CRF) antagonists, and pharmaceutically acceptable salts thereof.
- compounds of this invention can be administered at prophylactically effective dosage levels to prevent the above-recited conditions and disorders, as well as to prevent other conditions and disorders associated with sodium channel activity.
- Creams, ointments, jellies, solutions, or suspensions containing the instant compounds can be employed for topical use. Mouth washes and gargles are included within the scope of topical use for the purposes of this invention.
- Dosage levels from about O.Olmg/kg to about 140mg/kg of body weight per day are useful in the treatment of inflammatory and neuropathic pain, or alternatively about 0.5mg to about 7g per patient per day.
- inflammatory pain may be effectively treated by the administration of from about 0.0 lmg to about 75mg of the compound per kilogram of body weight per day, or alternatively about 0.5mg to about 3.5g per patient per day.
- Neuropathic pain may be effectively treated by the administration of from about O.Olmg to about 125mg of the compound per kilogram of body weight per day, or alternatively about 0.5mg to about 5.5g per patient per day.
- the amount of active ingredient that may be combined with the carrier materials to produce a single dosage form will vary depending upon the host treated and the particular mode of administration.
- a formulation intended for the oral administration to humans may conveniently contain from about 0.5mg to about 5g of active agent, compounded with an appropriate and convenient amount of carrier material which may vary from about 5 to about 95 percent of the total composition.
- Unit dosage forms will generally contain between from about lmg to about lOOOmg of the active ingredient, typically 25mg, 50mg, lOOmg, 200mg, 300mg, 400mg, 500mg, 600mg, 800mg or lOOOmg.
- the specific dose level for any particular patient will depend upon a variety of factors. Such patient-related factors include the age, body weight, general health, sex, and diet of the patient. Other factors include the time and route of administration, rate of excretion, drug combination, and the severity of the particular disease undergoing therapy.
- the compounds represented by Formula I, II, III and TV, or pharmaceutically acceptable salts thereof can be combined as the active ingredient in intimate admixture with a pharmaceutical carrier according to conventional pharmaceutical compounding techniques.
- the carrier may take a wide variety of forms depending on the form of preparation desired for administration, e.g., oral or parenteral (including intravenous).
- the pharmaceutical compositions of the present invention can be presented as discrete units suitable for oral administration such as capsules, cachets or tablets each containing a predetermined amount of the active ingredient.
- compositions can be presented as a powder, as granules, as a solution, as a suspension in an aqueous liquid, as a non-aqueous liquid, as an oil-in-water emulsion or as a water-in-oil liquid emulsion.
- the compounds represented by Formula I, II, III, and IV, or pharmaceutically acceptable salts thereof may also be administered by controlled release means and/or delivery devices.
- the compositions may be prepared by any of the methods of pharmacy. In general, such methods include a step of bringing into association the active ingredient with the carrier that constitutes one or more necessary ingredients. In general, the compositions are prepared by uniformly and intimately admixing the active ingredient with liquid carriers or finely divided solid carriers or both. The product can then be conveniently shaped into the desired presentation.
- the pharmaceutical compositions of this invention may include a pharmaceutically acceptable carrier and a compound or a pharmaceutically acceptable salt of Formula I, II, III, or IV.
- the compounds of Formula I, II, III, and IV, or pharmaceutically acceptable salts thereof, can also be included in pharmaceutical compositions in combination with one or more therapeutically active compounds.
- the pharmaceutical carrier employed can be, for example, a solid, liquid, or gas.
- solid carriers include lactose, terra alba, sucrose, talc, gelatin, agar, pectin, acacia, magnesium stearate, and stearic acid.
- liquid carriers are sugar syrup, peanut oil, olive oil, and water.
- gaseous carriers include carbon dioxide and nitrogen.
- any convenient pharmaceutical media may be employed.
- water, glycols, oils, alcohols, flavoring agents, preservatives, coloring agents and the like may be used to form oral liquid preparations such as suspensions, elixirs and solutions; while carriers such as starches, sugars, microcrystalline cellulose, diluents, granulating agents, lubricants, binders, and disintegrating agents can be used to form oral solid preparations such as powders, capsules and tablets.
- carriers such as starches, sugars, microcrystalline cellulose, diluents, granulating agents, lubricants, binders, and disintegrating agents can be used to form oral solid preparations such as powders, capsules and tablets.
- tablets and capsules are the preferred oral dosage units whereby solid pharmaceutical carriers are employed.
- tablets may be coated by standard aqueous or nonaqueous techniques
- a tablet containing the composition of this invention may be prepared by compression or molding, optionally with one or more accessory ingredients or adjuvants.
- Compressed tablets may be prepared by compressing, in a suitable machine, the active ingredient in a free-flowing form such as powder or granules, optionally mixed with a binder, lubricant, inert diluent, surface active or dispersing agent. Molded tablets may be made by molding in a suitable machine, a mixture of the powdered compound moistened with an inert liquid diluent.
- Each tablet preferably contains from about O.lmg to about 500mg of the active ingredient and each cachet or capsule preferably containing from about 0. lmg to about 500mg of the active ingredient.
- a tablet, cachet, or capsule conveniently contains 0. lmg, lmg, 5mg, 25mg, 50mg, lOOmg, 200mg, 300mg, 400mg, or 500mg of the active ingredient taken one or two tablets, cachets, or capsules, once, twice, or three times daily.
- compositions of the present invention suitable for parenteral administration may be prepared as solutions or suspensions of the active compounds in water.
- a suitable surfactant can be included such as, for example, hydroxypropylcellulose.
- Dispersions can also be prepared in glycerol, liquid polyethylene glycols, and mixtures thereof in oils. Further, a preservative can be included to prevent the detrimental growth of microorganisms.
- compositions of the present invention suitable for injectable use include sterile aqueous solutions or dispersions.
- the compositions can be in the form of sterile powders for the extemporaneous preparation of such sterile injectable solutions or dispersions.
- the final injectable form must be sterile and must be effectively fluid for easy syringability.
- the pharmaceutical compositions must be stable under the conditions of manufacture and storage, and thus should be preserved against the contaminating action of microorganisms such as bacteria and fungi.
- the carrier can be a solvent or dispersion medium containing, for example, water, ethanol, polyol (e.g. glycerol, propylene glycol and liquid polyethylene glycol), vegetable oils, and suitable mixtures thereof.
- compositions of the present invention can be in a form suitable for topical use such as, for example, an aerosol, cream, ointment, lotion, and dusting powder. Further, the compositions can be in a form suitable for use in transdermal devices. These formulations may be prepared, utilizing a compound represented by Formula I, II, III, or TV, or pharmaceutically acceptable salts thereof, via conventional processing methods. As an example, a cream or ointment is prepared by mixing hydrophilic material and water, together with about 5 wt% to about 10 wt% of the compound, to produce a cream or ointment having a desired consistency.
- compositions of this invention can be in a form suitable for rectal administration wherein the carrier is a solid, such as, for example, where the mixture forms unit dose suppositories.
- suitable carriers include cocoa butter and other materials commonly used in the art.
- the suppositories may be conveniently formed by first admixing the composition with the softened or melted carrier(s) followed by chilling and shaping in moulds.
- the pharmaceutical formulations described above may include, as appropriate, one or more additional carrier ingredients such as diluents, buffers, flavoring agents, binders, surface-active agents, thickeners, lubricants, and preservatives
- compositions containing a compound described by Formula I can be included to render the formulation isotonic with the blood of the intended recipient.
- an aspect of the invention is the treatment in mammals of maladies that are amenable to amelioration through blockage of neuronal sodium channels, including, for example, acute pain, chronic pain, visceral pain, inflammatory pain, and neuropathic pain by administering an effective amount of a compound of this invention.
- mammals includes humans, as well as other animals, such as, for example, dogs, cats, horses, pigs, and cattle. Accordingly, it is understood that the treatment of mammals other than humans refers to the treatment of clinical conditions in non-human mammals that correlate to the above-recited conditions.
- the instant compounds can be utilized in combination with one or more therapeutically active compounds.
- the inventive compounds can be advantageously used in combination with i) opiate agonists or antagonists, ii) calcium channel antagonists, iii) 5HT receptor agonists or antagonists iv) sodium channel antagonists, v) N-methyl-D- aspartate (NMDA) receptor agonists or antagonists, vi) COX-2 selective inhibitors, vii) neurokinin receptor 1 (NK1) antagonists, viii) non-steroidal anti-inflammatory drugs (NSAID), ix) selective serotonin reuptake inhibitors (SSRI) and/or selective serotonin and norepinephrine reuptake inhibitors (SSNRI), x) tricyclic anlidepressant drugs, xi) norepinephrine modulators, xii) lithium, xiii) valproate, and xiv) neurontin (gabapentin).
- the identification of inhibitors of the sodium channel is based on the ability of sodium channels to cause cell depolarization when sodium ions permeate through agonist-modified channels. In the absence of inhibitors, exposure of an agonist-modified channel to sodium ions will cause cell depolarization. Sodium channel inhibitors will prevent cell depolarization caused by sodium ion movement through agonist-modified sodium channels. Changes in membrane potential can be determined with voltage-sensitive fluorescence resonance energy transfer (FRET) dye pairs that use two components, a donor coumarin (CC 2 DMPE) and an acceptor oxanol (DiSBAC 2 (3)). Oxanol is a lipophilic anion and distributes across the membrane according to membrane potential.
- FRET voltage-sensitive fluorescence resonance energy transfer
- HEK-PNl PN1 sodium channel
- the media was aspirated, and the cells were washed with PBS buffer, and incubated with lOO ⁇ L of lO ⁇ M CC 2 -DMPE in 0.02% pluronic acid. After incubation at 25°C for 45min, media was removed and cells were washed 2x with buffer. Cells were incubated with lOO ⁇ L of DiSBAC 2 (3) in TMA buffer containing 20 ⁇ M veratridine, 20nM brevetoxin-3, and test sample.
- Electrophysiological Assays Cell preparation: A HEK-293 cell line stably expressing the PN1 sodium channel subtype was established in-house. The cells were cultured in MEM growth media (Gibco) with 0.5mg/mL G418, 50 units/mL Pen/Strep and ImL heat-inactivated fetal bovine serum at 37°C and 10% C0 2 . For electrophysiological recordings, cells were plated on 35mm dishes coated with poly-D-lysine.
- HEK-293 cells stably expressing the PN1 sodium channel subtype were examined by whole cell voltage clamp (Hamill et. al. Pfluegers Archives 391:85-100 (1981)) using an EPC-9 amplifier and Pulse software (HEKA Electronics, Lamprecht, Germany). Experiments were performed at room temperature. Electrodes were fire-polished to resistances of 2-4 M ⁇ . Voltage errors were minimized by series resistance compensation, and the capacitance transient was canceled using the EPC-9's built-in circuitry. Data were acquired at 50 kHz and filtered at 7-10 kHz.
- the bath solution consisted of 40 mM NaCl, 120 mM NMDG CI, 1 mM KCl, 2.7 mM CaCl 2 , 0.5 mM MgCl 2 , 10 mM NMDG HEPES, pH 7.4, and the internal (pipet) solution contained 110 mM Cs- methanesulfonate, 5 mM NaCl, 20mM CsCl, lOmM CsF, 10 mM BAPTA (tetra Cs salt), 10 mM Cs HEPES, pH 7.4.
- Rat Formalin Paw test (in vivo assay):
- compounds were prepared in either a EPEGS vehicle or a Tween80 (10%)/sterile water (90%) vehicle and were injected i.v. (via the lateral tail vein 15min after formalin) or p.o. (60min before formalin).
- the number of flinches was counted continuously for 60min using an automated nociception analyzer (UCSD Anesthesiology Research, San Diego, CA). Statistical significance was determined by comparing the total flinches detected in the early (0-lOmin) and late (ll-60min) phase with an unpaired t-test.
- CFA complete Freund's adjuvant
- oil/saline (1:1) emulsion 0.5mg Mycobacterium/mL
- Mechanical hyperalgesia was assessed 3 days after tissue injury using a Randall- Selitto test. Repeated Measures ANOVA, followed by Dunnett's Post Hoc test.
- Tactile allodynia was assessed with calibrated von Frey filaments using an up-down paradigm before and two weeks following nerve injury. Animals were placed in plastic cages with a wire mesh floor and allowed to acclimate for 15min before each test session. To determine the 50% response threshold, the von Frey filaments (over a range of intensities from 0.4 to 28.8g) were applied to the mid- plantar surface for 8s, or until a withdrawal response occurred. Following a positive response, an incrementally weaker stimulus was tested. If there was no response to a stimulus, then an incrementally stronger stimulus was presented. After the initial threshold crossing, this procedure was repeated for four stimulus presentations per animal per test session. Mechanical sensitivity was assessed 1 and 2 hr post oral administration of the test compound.
- the compounds described in this invention displayed sodium channel blocking activity of from about ⁇ 0.1 ⁇ M to about ⁇ 50 ⁇ M in the in vitro assays described above. It is advantageous that the compounds display sodium channel blocking activity of ⁇ 5 ⁇ M in the in vitro assays. It is more advantageous that the compounds display sodium channel blocking activity of ⁇ luM in the in vitro assays. It is even more advantageous that the compounds display sodium channel blocking activity of ⁇ 0.5 ⁇ M in the in vitro assays. It is still more advantageous that the compounds display sodium channel blocking activity of ⁇ 0.1 ⁇ M in the in vitro assays.
- novel compounds of the present invention can be readily synthesized using techniques known to those skilled in the art, such as those described, for example, in Advanced Organic Chemistry. March, 4 th Ed., John Wiley and Sons, New York, NY, 1992 ; Advanced Organic Chemistry, Carey and Sundberg, Vol. A and B, 3 rd Ed., Plenum Press, Inc., New York, NY, 1990; Protective groups in Organic Synthesis. Green and Wuts, 2 nd Ed., John Wiley and Sons, New York, NY, 1991 ;
- the starting materials for the compounds of the present invention may be prepared from the chemical precursors that are readily available from commercial sources, including Aldrich Chemical Co. (Milwaukee, WF); Sigma Chemical Co. (St. Louis, MO); Lancaster Synthesis (Windham, N.H.); Ryan Scientific (Columbia, S. C); Maybridge (Cornwall, UK); Matrix Scientific (Columbia, S. C); Arcos, (Pittsburgh, PA) and Trans World Chemicals (Rockville, MD).
- the procedures described herein for the synthesis of compounds of this invention may include one or more steps of protecting group manipulations and of purification, such as, recrystallization, distillation, column chromatography, flash chromatography, thin-layer chromatography (TLC), radial chromatography and high-pressure chromatography (HPLC).
- the products can be characterized by using various techniques well known in the chemical arts, including proton and carbon-13 nuclear magnetic resonance (TI and 13 C NMR), infrared and ultraviolet spectroscopy (IR and UV), X-ray crystallography, elemental analysis and HPLC and mass spectrometry (LC-MS).
- Methods of protecting group manipulation, purification, structure identification and quantification are well known to one skilled in the art of chemical synthesis.
- An appropriate 1,3-diketone 1 can be reacted with an aryl hydrazine 2 to give the pyrazole-3-carboxylate 3, which can be easily converted into the corresponding amide 4.
- Reaction of 4 with an appropriate phenyl boronic acid 5 under Pd-catalyzed cross-coupling condition [Suzuki et. al., Chem. Rev., 95: 2457, (1995)] can produce the desired biphenyl pyrazole 6.
- the Pd-catalyzed cross- coupling reaction known as a Suzuki Reaction, is one of the most versatile methods for the synthesis of biaryl compounds.
- an appropriate aryl bromo, iodo, or triflate compound such as 3 or 4 is reacted with an aryl boronic acid in the presence of a palladium catalyst such as palladium acetate with triphenyl phosphine and aqueous sodium carbonate in a solvent such as toluene and a co-solvent such as n-propanol [Suzuki et. al., Chem. Rev., 95: 2457, (1995)].
- aryl boronic acids are commercially available or can be prepared conveniently from the corresponding aryl bromide or iodide by converting it to an organolithium derivative [Baldwin, J. E. et al ' ., Tetrahedron Lett., 39: 707-710
- the pyrazole 6 can be synthesized as shown in Scheme 2.
- the Boc protected aryl hydrazide 8 can be cross-coupled, as described above, to provide the protected biaryl hydrazide 9.
- the Boc protecting group of compound 9 can be removed under standard conditions, trifluoroacetic acid in dichloromethane, to give the TFA salt of hydrazide 10 which can be desalted with aqueous NaOH solution and reacted with a diketone 1 to provide the ester 11.
- Ester 11 is hydrolyzed to the corresponding acid 12 which is then reacted with carbonyldiimidazole (CDI) in DMF, followed by ammonium acetate or an appropriate amine to give the pyrazole amide 13.
- CDI carbonyldiimidazole
- the biaryl compounds such as 11 and 6, can be prepared by forming the aryl boronates (14 and 16) from the corresponding halo compounds such as 3 and 4, respectively.
- Aryl boronates can be used as an alternative to aryl boronic acids in these Pd-catalyzed coupling reactions [Giroux, A. et. al., Tetrahedron Lett., 38, 3841(1997)].
- the boronates can be easily prepared from the aryl bromides, iodides and trifluoromethane sulfonates using the method described by Murata, M. et. al., J. Org. Chem. 65: 164-168 (2000).
- the pyrazole 3-carboxamides 21 can be prepared from the corresponding carboxylic acid 20 as outlined in Scheme 5.
- the aldehyde 22 can be prepared by treating the ester 11 with a reducing agent such as diisobutylaluminium hydride (DIBALH) at -78°C.
- DIBALH diisobutylaluminium hydride
- treatment of 11 with DIBALH at 0°C can provide the corresponding alcohol 23, which can be converted into carbamates 27 from Scheme 7.
- ketone 25 can be accomplished by the reaction of methyl magnesium bromide with the amide 24.
- the olefinic derivative 26 can be easily prepared from the aldehyde 14 as outline in Scheme 7, which can be further elaborated to provide appropriate compounds of this invention.
- the ⁇ -ketoester 29 is reacted with an appropriate substituted hydrazine to provide a mixture of pyrazole esters, which can be separated by chromatography.
- the individual ester derivative is then reacted with ammonia to give 30 and 31, which after reaction with aryl boronic acids affords 32 and 33.
- pyrazole ester 39 can be converted into a secondary alcohol 40 by reaction with a mixture of lithium borohydride and a Grignard reagent in an aprotic solvent such as THF.
- ester 39 can be reduced to primary alcohol 42 by any of several reducing agents, which include lithium aluminum hydride (LAH), diisobutylaluminum hydride (DIBALH) and sodium borohydride (NaBH ).
- LAH lithium aluminum hydride
- DIBALH diisobutylaluminum hydride
- NaBH sodium borohydride
- Either alcohol 40 or 42 can be further derivatized by any number of methods.
- alcohol 40 can be oxidized to the ketone 41 by a variety of oxidizing reagents which include chromium-based reagents, and Swern type reagents (DMSO and oxalyl chloride).
- the alcohol 48 also can be converted to fluoro derivative 43 by reaction with diethylaminosulfurtrifluoride (DAST) in dichlormethane at reduced temperatures, as described in Scheme 11.
- DAST diethylaminosulfurtrifluoride
- the pyridyl-pyrazole-3-carboxylate 48 can be prepared as outlined in Scheme 12.
- solvents are those in which one or all of the reactants will at least partially be soluble and will not adversely interact with either the reactants or the product.
- Suitable solvents include aromatic hydrocarbons (e.g, toluene, xylenes), halogenated solvents (e.g, methylene chloride, chloroform, carbontetrachloride, chlorobenzenes), ethers (e.g, diethyl ether, diisopropylether, tert-butyl methyl ether, diglyme, tetrahydrofuran, dioxane, anisole), nitriles (e.g, acetonitrile, propionitrile), ketones (e.g, 2- butanone, dithyl ketone, tert-butyl methyl ketone), alcohols (e.g, methanol, ethanol, n-propanol, iso- propanol, n-butanol, t-but
- Suitable bases are, generally, alkali metal hydroxides, alkaline earth metal hydroxides such as lithium hydroxide, sodium hydroxide, potassium hydroxide, barium hydroxide, and calcium hydroxide; alkali metal hydrides and alkaline earth metal hydrides such as lithium hydride, sodium hydride, potassium hydride and calcium hydride; alkali metal amides such as lithium amide, sodium amide and potassium amide; alkali metal carbonates and alkaline earth metal carbonates such as lithium carbonate, sodium carbonate, cesium carbonate, sodium hydrogen carbonate, and cesium hydrogen carbonate; alkali metal alkoxides and alkaline earth metal alkoxides such as sodium methoxide, sodium ethoxide, potassium tert-butoxide and magnesium ethoxide; alkali metal alkyls such as methyllithium, n-butyllithium, sec-butyllithium, t-bultyl
- any of the usual pharmaceutical media can be employed.
- oral liquid preparations such as suspensions, elixirs and solutions
- water, glycols, oils, alcohols, flavoring agents, preservatives, coloring agents and the like may be used; or in the case of oral solid preparations such as powders, capsules and tablets, carriers such as starches, sugars, microcrystalline cellulose, diluents, granulating agents, lubricants, binders, disintegrating agents, and the like may be included.
- carriers such as starches, sugars, microcrystalline cellulose, diluents, granulating agents, lubricants, binders, disintegrating agents, and the like may be included.
- tablets and capsules represent the most advantageous oral dosage unit form in which solid pharmaceutical carriers are obviously employed.
- tablets may be coated by standard aqueous or nonaqueous tecliniques.
- controlled release means and/or delivery devices may also be used in administering the instant compounds and compositions.
- NMR data is in the form of delta ( ⁇ ) values for major diagnostic protons, given in parts per million (ppm) relative to tetramethylsilane (TMS) as internal standard, determined at 300MHz, 400MHz or 500MHz using the indicated solvent.
- TMS tetramethylsilane
- Conventional abbreviations used for signal shape are: s. singlet; d. doublet; t. triplet; m. multiplet; br. broad; etc.
- “Ar” signifies an aromatic signal.
- 2-(Trifluoromethoxy)phenylboronic acid n-Butyllithium (5.9 ml, 9.5 mmol) was added to a solution of l-bromo-2- (trifluoromethoxy)benzene (2 g, 8.2 mmol) in tetrahydrofuran (28 ml) at -78°C and stirred for 45 minutes. Triisopropyl borate (2.58 ml, 11.1 mmol) was added dropwise to the reaction mixture and the solution was slowly brought to room temperature over 16 hours. The reaction mixture was quenched with water, made basic with 2N NaOH and extracted with ethyl acetate.
- the titled compound was prepared by reacting ethyl l-(3-bromophenyl)-5-methyl-lH- pyrazole-3-carboxylate (from Step 1 of EXAMPLE 1) with 2-(Trifluoromethoxy)phenylboronic acid (from Step 3 of EXAMPLE 1) under the reaction condition described in Step 4 of EXAMPLE 1.
- the reaction mixture was cooled to room temperature, and 2-bromo-5-fluorobenzotrifluoride (0.12 g, 0.5 mmol), PdCl 2 (dppf) 2 (0.005 g, 3 mol%) and 2M sodium carbonate (0.61 mL, 1.2 mmol) were added to the reaction mixture.
- the reaction was then subjected to microwave radiation at 140°C for 2800 seconds. After cooling to room temperature, the reaction mixture was partitioned between EtOAc and water. The organic layer was washed with saturated sodium bicarbonate and brine, then dried over sodium sulfate, filtered and concentrated.
- Step 1 Ethyl 3-amino-l-(3-bromophenyl)-lH-pyrazole-4-carboxylate:
- Step 2 Ethyl 3-amino-l-r2'-(trifluoromethoxy)- r-biphenyl-3-vn-lH-pyrazole-4-carboxylate: To a solution of the product from Step 1 ( 0.452 g, 1.45 mmol) in toluene (4 mL) were added 2-trifluoromethoxyphenylboronic acid (0.450 g, 2.18 mmol), tetrakis(triphenylphosphine)palladium ( 0.050 g, 3 mol%) and 2M sodium carbonate (1.45 mL, 2.9 mmol). The reaction was refluxed for 16 hours, then cooled and partitioned between EtOAc and water.
- Step 1 Ethyl 3-amino-l-(3-bromophenyl)-lH-pyrazole-4-carboxylate:
- Step 3 Ethyl l-(2'-chloro-l.r-biphenyl-3-yl)-lH-pyrazole-4-carboxylate:
- Step 4 l-(2'-chloro-Lr-biphenyl-3-yl)-lH-pyrazole-4-carboxamide:
- EXAMPLE 3 ethyl-5-methyl-l-[2'-(trifluoromethoxy)-l,r-biphenyl-3-yl]- lH-pyrazole-3 -carboxy late (EXAMPLE 3) (l.lg, 2.82mmol) in anhydrous dichloromethane (lOmL) was added DD3AL-H in toluene solution (1.0M, 6.8mL, 6.8mmol). The reaction was stined at 0°C for 30 minutes, then 0.5mL of methanol was added. The reaction was warmed up to room temperature, and stined continuously for another 30 minutes.
- the titled compound was prepared by reacting ethyl 3-methyl-l-[2'-(trifluoromethoxy)- l,l'-biphenyl-3-yl]-lH-pyrazole-5-carboxylate (EXAMPLE 21) with DIBALH in a manner described in EXAMPLE 123.
- Step 2 2- ⁇ 3-r2'-(trifluoromethyl)-l.r-biphenyl-3-vn-lH-pyrazol-l-yllpyridine: (A) and 2- ⁇ 5-r2'-(trifluoromethyl)-l.l'-biphenyl-3-yll-lH-pyrazol-l-vnpyridine: (B)
- Step 3 3-(3-bromophenyl)- 1 -methyl- lH-py razole-5 -carboxamide (5) :
- Step 4 l-Methyl-3-r2'-(trifluoromethoxy)-l.r-biphenyl-3-yn-lH-pyrazole-5-carboxamide (1) l-Methyl-5-r2'-(trifluoromethoxy)-l.r-biphenyl-3-yll-lH-pyrazole-3-carboxamide (2): The carboxamide 5 (0.042 g, 0.1 mmol) was reacted with 2- trifluoromethoxyphenyl boronic acid as described in Step 2 of EXAMPLE 137.
- Step 1 Ethyl 3-oxo-3-r2'-(trifluoromethoxy)-l '-biphenyl-3-yl1propanoate:
- Step 2 Ethyl 3-r2'-(trifluoromethoxy)-l .1 '-biphenyl-3-yll- lH-pyrazole-5 -carboxylate:
- Step 3 3-r2'-(trifluoromethoxy)- 1. l'-biphenyl-3-yll- lH-pyrazole-5 -carboxamide:
- the pyrazole ester (47 mg, 0.1 mmol) from Step 2 was treated with ammonia gas in a sealed tube as described in Step 2 of EXAMPLE 140 to provide the titled compound, after purification by reverse phase HPLC (acetonitrile/water system) (gradient: 40 % to 100 % acetonitrile over 11 minutes) in 74 % yield (0.036g, retention time 6.57 minutes).
- Step 3 l-r6-fluoro-2'-(trifluoromethoxy)-l.r-biphenyl-3-yll-5-methyl-lH-pyrazole-3- carboxamide.
- the crude product obtained upon concentration of the organic phase, was purified by reverse phase ⁇ PLC (acetonitrile/water system) (gradient: 10 % to 90 % acetonitrile over 10 minutes) to yield the titled product (0.009 g , 9.5 %).
- ⁇ PLC acetonitrile/water system
- Step 2 l-(3-bromophenyl)-lH-pyrazole-3.5-dicarboxamide:
- Step 3 l-[2'-(trifluoromethyl)biphenyl-3yl-ll-lH-pyrazole-3.5-dicarboxamide:
- the 3-bromophenyl pyrazole methyl ester (300 mg, 1 mmol) (from Step 2) was mixed with ammonia-methanol (7.0 N, 4 mL) in a sealed tube and heated overnight at 70°C. After cooling, the reaction mixture was concentrated to give the conesponding amide product as yellow foam 220 mg (73%).
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WO2007034279A2 (en) * | 2005-09-19 | 2007-03-29 | Pfizer Products Inc. | C3a antagonists and pharmaceutical compositions thereof |
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Also Published As
Publication number | Publication date |
---|---|
US20060183785A1 (en) | 2006-08-17 |
CA2520804A1 (en) | 2004-10-28 |
CN1798738A (en) | 2006-07-05 |
JP2006522130A (en) | 2006-09-28 |
AU2004230854A1 (en) | 2004-10-28 |
EP1615895A1 (en) | 2006-01-18 |
US7589116B2 (en) | 2009-09-15 |
CN101333192A (en) | 2008-12-31 |
EP1615895A4 (en) | 2007-11-07 |
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