WO2009058299A1 - P2x3 receptor antagonists for treatment of pain - Google Patents
P2x3 receptor antagonists for treatment of pain Download PDFInfo
- Publication number
- WO2009058299A1 WO2009058299A1 PCT/US2008/012271 US2008012271W WO2009058299A1 WO 2009058299 A1 WO2009058299 A1 WO 2009058299A1 US 2008012271 W US2008012271 W US 2008012271W WO 2009058299 A1 WO2009058299 A1 WO 2009058299A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mmol
- pyridin
- aryl
- ethyl
- heterocyclyl
- Prior art date
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- MGLZPZFRFJTOLN-UHFFFAOYSA-N tert-butyl 3-(4-methylphenyl)-5-(5-oxa-6-azaspiro[3.4]oct-6-en-7-yl)benzoate Chemical compound C1=CC(C)=CC=C1C1=CC(C(=O)OC(C)(C)C)=CC(C=2CC3(CCC3)ON=2)=C1 MGLZPZFRFJTOLN-UHFFFAOYSA-N 0.000 description 1
- OYKOFMSCKHKFLZ-UHFFFAOYSA-N tert-butyl 3-(5-methylpyridin-2-yl)-5-(5-oxa-6-azaspiro[3.4]oct-6-en-7-yl)benzoate Chemical compound N1=CC(C)=CC=C1C1=CC(C(=O)OC(C)(C)C)=CC(C=2CC3(CCC3)ON=2)=C1 OYKOFMSCKHKFLZ-UHFFFAOYSA-N 0.000 description 1
- VVXBARFWBGGFJQ-UHFFFAOYSA-N tert-butyl 3-bromo-5-(hydroxymethyl)benzoate Chemical compound CC(C)(C)OC(=O)C1=CC(Br)=CC(CO)=C1 VVXBARFWBGGFJQ-UHFFFAOYSA-N 0.000 description 1
- RUPAXCPQAAOIPB-UHFFFAOYSA-N tert-butyl formate Chemical group CC(C)(C)OC=O RUPAXCPQAAOIPB-UHFFFAOYSA-N 0.000 description 1
- 150000003512 tertiary amines Chemical class 0.000 description 1
- 125000001712 tetrahydronaphthyl group Chemical group C1(CCCC2=CC=CC=C12)* 0.000 description 1
- CZDYPVPMEAXLPK-UHFFFAOYSA-N tetramethylsilane Chemical compound C[Si](C)(C)C CZDYPVPMEAXLPK-UHFFFAOYSA-N 0.000 description 1
- 150000003536 tetrazoles Chemical class 0.000 description 1
- 125000003831 tetrazolyl group Chemical group 0.000 description 1
- 229960004559 theobromine Drugs 0.000 description 1
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- VLLMWSRANPNYQX-UHFFFAOYSA-N thiadiazole Chemical compound C1=CSN=N1.C1=CSN=N1 VLLMWSRANPNYQX-UHFFFAOYSA-N 0.000 description 1
- 125000006089 thiamorpholinyl sulfoxide group Chemical group 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 229930192474 thiophene Natural products 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 230000008733 trauma Effects 0.000 description 1
- 230000000472 traumatic effect Effects 0.000 description 1
- 150000003852 triazoles Chemical class 0.000 description 1
- IMNIMPAHZVJRPE-UHFFFAOYSA-N triethylenediamine Chemical compound C1CN2CCN1CC2 IMNIMPAHZVJRPE-UHFFFAOYSA-N 0.000 description 1
- 125000001889 triflyl group Chemical group FC(F)(F)S(*)(=O)=O 0.000 description 1
- 206010044652 trigeminal neuralgia Diseases 0.000 description 1
- RKBCYCFRFCNLTO-UHFFFAOYSA-N triisopropylamine Chemical compound CC(C)N(C(C)C)C(C)C RKBCYCFRFCNLTO-UHFFFAOYSA-N 0.000 description 1
- YFTHZRPMJXBUME-UHFFFAOYSA-N tripropylamine Chemical compound CCCN(CCC)CCC YFTHZRPMJXBUME-UHFFFAOYSA-N 0.000 description 1
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 description 1
- 229960000281 trometamol Drugs 0.000 description 1
- 239000012588 trypsin Substances 0.000 description 1
- 238000000870 ultraviolet spectroscopy Methods 0.000 description 1
- 210000003741 urothelium Anatomy 0.000 description 1
- 210000001177 vas deferen Anatomy 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
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- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
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- 238000002424 x-ray crystallography Methods 0.000 description 1
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- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D413/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms
- C07D413/14—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing three or more hetero rings
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
- A61P1/04—Drugs for disorders of the alimentary tract or the digestive system for ulcers, gastritis or reflux esophagitis, e.g. antacids, inhibitors of acid secretion, mucosal protectants
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P25/00—Drugs for disorders of the nervous system
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P25/00—Drugs for disorders of the nervous system
- A61P25/04—Centrally acting analgesics, e.g. opioids
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P25/00—Drugs for disorders of the nervous system
- A61P25/08—Antiepileptics; Anticonvulsants
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P25/00—Drugs for disorders of the nervous system
- A61P25/18—Antipsychotics, i.e. neuroleptics; Drugs for mania or schizophrenia
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P25/00—Drugs for disorders of the nervous system
- A61P25/20—Hypnotics; Sedatives
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P25/00—Drugs for disorders of the nervous system
- A61P25/22—Anxiolytics
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P25/00—Drugs for disorders of the nervous system
- A61P25/24—Antidepressants
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P29/00—Non-central analgesic, antipyretic or antiinflammatory agents, e.g. antirheumatic agents; Non-steroidal antiinflammatory drugs [NSAID]
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P9/00—Drugs for disorders of the cardiovascular system
- A61P9/06—Antiarrhythmics
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- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D261/00—Heterocyclic compounds containing 1,2-oxazole or hydrogenated 1,2-oxazole rings
- C07D261/02—Heterocyclic compounds containing 1,2-oxazole or hydrogenated 1,2-oxazole rings not condensed with other rings
- C07D261/04—Heterocyclic compounds containing 1,2-oxazole or hydrogenated 1,2-oxazole rings not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D261/00—Heterocyclic compounds containing 1,2-oxazole or hydrogenated 1,2-oxazole rings
- C07D261/02—Heterocyclic compounds containing 1,2-oxazole or hydrogenated 1,2-oxazole rings not condensed with other rings
- C07D261/06—Heterocyclic compounds containing 1,2-oxazole or hydrogenated 1,2-oxazole rings not condensed with other rings having two or more double bonds between ring members or between ring members and non-ring members
- C07D261/08—Heterocyclic compounds containing 1,2-oxazole or hydrogenated 1,2-oxazole rings not condensed with other rings having two or more double bonds between ring members or between ring members and non-ring members with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon atoms
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- C07D—HETEROCYCLIC COMPOUNDS
- C07D261/00—Heterocyclic compounds containing 1,2-oxazole or hydrogenated 1,2-oxazole rings
- C07D261/20—Heterocyclic compounds containing 1,2-oxazole or hydrogenated 1,2-oxazole rings condensed with carbocyclic rings or ring systems
-
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- C07D—HETEROCYCLIC COMPOUNDS
- C07D263/00—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings
- C07D263/02—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings not condensed with other rings
- C07D263/30—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
- C07D263/32—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon atoms
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- C07D413/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings
- C07D413/04—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings directly linked by a ring-member-to-ring-member bond
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- C07D—HETEROCYCLIC COMPOUNDS
- C07D413/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms
- C07D413/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings
- C07D413/12—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings linked by a chain containing hetero atoms as chain links
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- C07D—HETEROCYCLIC COMPOUNDS
- C07D417/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00
- C07D417/14—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing three or more hetero rings
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D487/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00
- C07D487/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00 in which the condensed system contains two hetero rings
- C07D487/04—Ortho-condensed systems
Definitions
- the invention relates generally to compounds which act as modulators, e.g., antagonists of the P2X3 receptor, compositions and therapeutic uses thereof.
- Purines acting via an extracellular purinoreceptor, have been implicated as having a variety of physiological and pathological roles. (See, Burnstock (1993) Drug Dev. Res. 28:195- 206.) Purinoreceptors (P2) have been generally categorized as either metabotropic nucleotide receptors or ionotropic receptors for extracellular nucleotides.
- Metabotropic nucleotide receptors (usually designated P2 Y or P2 Y (n), where "n” is a subscript integer indicating subtype) are believed to differ from ionotropic receptors (usually designated P2X or P2X n ) in that they are based on a different fundamental means of transmembrane signal transduction: P2Y receptors operate through a G protein-coupled system, while P2X receptors are ligand-gated ion channels.
- P2Xi cDNA was cloned from the smooth muscle of the rat vas deferens (Valera et al. (1994) Nature 371:516-519) and P2X 2 cDNA was cloned from PC12 cells (Brake et al. (1994) Nature 371 :519-523).
- Five other P2X receptors have been found in cDNA libraries by virtue of their sequence similarity to P2X ⁇ and P2X 2 - P2X 3 : Lewis et al. (1995) Nature 377:432-435, Chen et al.
- Purinergic receptors in particular, P2X receptors
- P2X receptors are known to function as homomultimeric cation-permeable ion channels and, in some cases, as heteromeric channels consisting of two different P2X receptor subtypes (Lewis et al., Nature 377:432-435 (1995); Le et al., J. Neurosci. 18:7152-7159 (1998); Torres et al., MoI. Pharmacol. 54:989-993 (1998)).
- the P2X 2 and P2X 3 subunits form functional channels when expressed alone, and can also form a functional heteromultimeric channel that has properties similar to currents seen in native sensory channels when co-expressed.
- At least one pair of P2X receptor subtypes, P2X 2 and P2X 3 functions as a heteromeric channel in rat nodose ganglion neurons where it exhibits distinct pharmacological and electrophysiological properties (Lewis et al., supra (1995)).
- Native P2X receptors are known to form rapidly activated, nonselective cationic channels upon activation by ATP.
- the channels formed by P2X receptors generally have high Ca + permeability (P( Ca ) /P(Na) )•
- the P2X 3 purinergic receptor is a ligand-gated cation channel that is selectively permeable to small cations.
- Known ligands for P2X receptors include natural nucleotides, for example, ATP, UTP, UDP, or synthetic nucleotides, for example 2-methylthioATP.
- ATP in addition to its function as an intracellular energy donor, is now recognized as an important neurotransmitter or cotransmitter, in both the central and peripheral nervous system (Ralevic, V., et al., Pharmacol. Rev., 50:413-492 (1998)). It is released from a variety of cell types, including nerve fibers, upon stimulation and produces diverse effects on many tissues by activation of specific membrane receptors including purinoreceptors (P2 receptor) (See Burnstock, G., Pharmacol. Rev., 24:509-581 (1972); Burnstock, G., Cell Membrane Receptor for Drugs and Hormones: A Multidisciplinary Approach, edited by R. W. Straub and L. Bolid.
- P2 receptor purinoreceptors
- ATP can stimulate sensory nerve endings resulting in intense pain and a pronounced increase in sensory nerve discharge.
- ATP released from damaged cells can evoke pain by activating P2X 3 homomeric receptors, or P2X 2 /P2X 3 heteromeric receptors expressed on nociceptive nerve endings of sensory nerves. This is consistent with reports of the induction of pain by intradermally applied ATP in the human blister-base model; the identification of P2X 3 containing receptor on nociceptive neurons in the tooth pulp; and with reports that P2X antagonists are analgesic in animal models.
- P2X 3 receptor gene disruption results in a diminished sensitivity to noxious chemical stimuli and reduced pain.
- the nociceptive effects of exogenously administered ATP and P2X containing receptor agonists have also been demonstrated in laboratory animals. See Bland- Ward et al., Dr. J. Pharmacol. 122:366-371 (1997); Hamilton et al., Br. J. Phamacol. 126:326- 332 (1999).
- the peripheral nociceptive actions of P2X activation and stimulation of spinal P2X containing receptor also contribute to nociception as indicated by the ability of intrathecally (i.t.) administered P2 receptor agonists to increase sensitivity to acute and persistent noxious stimuli in rodents.
- P2X 3 containing receptors P2X 3 and/or P2X 2/3
- P2X 3 and/or P2X 2/3 P2X 3 containing receptors
- compounds which block or inhibit activation of P2X 3 receptors serve to block the pain stimulus.
- receptor antagonists to compounds which normally activate the P2X 3 receptor and/or P2X 2 /P2X 3 heteromeric channels, such as ATP could successfully block the transmission of pain.
- modulators of P2X receptors e.g., P2X 3 receptor may find use as analgesics.
- compounds that block or inhibit activation of P2X 3 receptors also serve to treat genitourinary, gastrointestinal and respiratory diseases, conditions and disorders or receptor antagonists to compounds which normally activate the P2X 3 receptor and/or P2X 2 /P2X 3 heteromeric channels, such as ATP are useful for treatment of genitourinary, gastrointestinal and respiratory diseases, conditions and disorders.
- P2X receptors have been studied in a number of neurons including sensory, sympathetic, parasympathetic, mesenteric, and central neurons (Zhong, et al. (1998) Br. J. Pharmacol. 125:771-781). These studies indicate that purinergic receptors play a role in affterent neurotransmission from the bladder, and that modulators of P2X receptors are potentially useful in the treatment of bladder disorders and other genitourinary diseases or conditions.
- P2X3 receptors have been shown to be expressed in human colon, and are expressed at higher levels in inflamed colon, than in normal colon (Y. Yiangou et al, Neurokastroenterol Mot (2001) 13:365-69).
- P2X3 receptors have also been implicated in detection of distension or intraluminal pressure in the intestine and initiation of reflex contractions (X. Bian et al. J. Physiol (2003) 551.1 :309-22), and have linked this to coilitis (G. Wynn et al., Am J. Physiol Gastrointest Liver Physiol (2004) 287:G647-57).
- P2X 3 receptors also have been shown to be expressed in pulmonary neuroepithelial bodies (NEBs), implicating the receptor in pain transmission in the lung (Inge Brouns et al., Am J. Respir Cell MoI Biol (2000) 23:52061). Additionally, P2X 2 and P2X 3 receptors have been implicated in p ⁇ 2 detection in pulmonary NEBs (W. Rong et al., J Neurosci (2003) 23(36):11315-21).
- the present invention aims to overcome some of the aforementioned drawbacks by providing novel P2X3 receptor antagonists that play a critical role in treating disease states associated with pain, in particular peripheral pain, inflammatory pain, or tissue injury pain that can be treated using a P2X3 receptor subunit modulator.
- the present invention relates to a novel P2X3 type receptor antagonists of structural formula I: or pharmaceutically acceptable salts and individual enantiomers and diastereomers thereof wherein:
- X and Y independently represent N, or CR 1 ;
- A represents a five membered heterocyclyl selected from the group consisting of (CH2) n oxazolyl, (CH2) n isoxazolyl, (CH2) n dihydro-isoxazolyl, and (CH2) n oxadiazolyl;
- Rl represents H, Ci -6 alkyl, halogen, (CH2) n CF3, C3.10 cycloalkyl, CN, (CH2) n OR2, (CH2)nC5-lO heterocyclyl, (CH2)nC6-10 aryU or Ci-6 alkoxy; said alkyl, cycloalkyl, heterocyclyl and aryl optionally substituted with 1 to 3 groups of Ci -6 alkyl, halogen, hydroxyl, (CH 2 )nCF 3 ,or CN;
- R 2 represents H, Ci -6 alkyl
- R3 represents CR2R4R5 ;
- R2 and R3 can be combined with the nitrogen to which they are attached to form a C5.10 heterocyclyl optionally substituted with 1 to 3 groups of R a ;
- R4 and R5 independently represent H, (CH2) n OR2, CHF2, (CH2) n C5-10 heterocyclyl, (CH2)nC6-10 aryl, C3.10 cycloalkyl, Ci-6 alkoxy, or Ci-6 alkyl; said alkyl, cycloalkyl, heterocyclyl and aryl optionally substituted with 1 to 3 groups of R a ;
- R6 and R 7 independently represent hydrogen, Ci -6 alkyl, halogen, hydroxyl, (CH2)nCF3, C3-6 cycloalkyl, (CH2)nC5-lO heterocyclyl, or (CH2)nC6-10 aryl > said heterocyclyl and aryl optionally substituted with 1 to 3 groups of Ci_6 alkyl, C5.10 heterocyclyl, halogen, (CH2) n OR 2 , - C(R2) 2 OR -C(O)R2, (CH2) n CF3,or CN;
- R6 and R 7 can be combined with a carbon atom on the ring to form a 4 to 6 membered spirocycle
- Ra represents Ci-6 alkyl, halogen, -OR2, hydroxyl, (CH2) n CF3, -O-, C3-6 cycloalkyl, C5.10 heterocyclyl, or C6-10 aryl > said heterocyclyl and aryl optionally substituted with 1 to 3 groups of C 1-6 alkyl, halogen, hydroxyl, (CH2) n CF3,or CN; and
- n 0 to 4.
- This invention also relates to compositions and methods for using the compounds disclosed herein. These and other embodiments of the present invention will readily occur to those of ordinary skill in the art in view of the disclosure herein.
- the present invention relates to a novel P2X3 type receptor antagonists of structural formula I that are useful in treating pain and diseases associated with pain.
- One embodiment of the present invention is realized when X and Y are not N at the same time and all other variables are as previously described.
- Another embodiment of the present invention is realized when both X and Y are CH and all other variables are as previously described.
- Another embodiment of the present invention is realized when X is N and Y is CH and all other variables are as previously described.
- Another embodiment of the present invention is realized when A is isoxazolyl and all other variables are as previously described.
- Another embodiment of the present invention is realized when A is oxazolyl and all other variables are as previously described.
- Another embodiment of the present invention is realized when A is oxadiazolyl and all other variables are as previously described.
- Another embodiment of the present invention is realized when A is linked to the phenyl ring through a nitrogen atom and all other variables are as previously described. Another embodiment of the present invention is realized when A is linked to the phenyl ring through a carbon atom and all other variables are as previously described.
- R 2 is hydrogen and both of R 4 and R5 in R? are Cl -6 alkyl and all other variables are as previously described.
- R 2 is hydrogen and one of R 4 and R5 in R3 is Cl -6 alkyl and the other is C5-10 heterocyclyl, said heterocylyl optionally substituted with 1 to 3 groups of R a and all other variables are as previously described.
- Still another embodiment of the present invention is realized when R.6 and/or R7 are substituents on the carbon atoms of the ring.
- a sub-embodiment of this invention is realized when one of R6 and R 7 is hydrogen and the other C5-10 heterocyclyl optionally substituted with
- a sub-embodiment of formula II is realized when A is isoxazolyl. Another sub-embodiment of formula II is realized when A is dihydro-isoxazolyl. Another sub-embodiment of formula II is realized when A is oxazolyl. Another sub-embodiment of formula II is realized when A is oxadiazolyl. Another sub- embodiment of formula II is realized when X is nitrogen. Still another sub-embodiment of formula II is realized when X is CH.
- Still another embodiment of the compound of formula II is realized when A is isoxazolyl, one of R 6 and R 7 is hydrogen and the other is C6-10 aryl, or C5-10 heterocyclyl optionally substituted with 1 to 3 groups of R a , X is nitrogen, R3 is CHR 4 R5, and one of R 4 and R 5 is C 1-6 alkyl and the other is C6-10 aryl, or C5-10 heterocyclyl, said aryl and heterocyclyl optionally substituted with 1 to 3 groups of R a .
- a sub-embodiment of this invention is realized when said aryl and heterocyclyl in R 4 , R5, R6, and R 7 are selected from the group consisting of phenyl, napthyl, furanyl, piperonyl, oxazolyl, oxadiazolyl, quinolyl, isoquinolyl, triazolyl, pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl, and thiazolyl, preferably phenyl or pyridyl.
- A is dihydro-isoxazolyl
- one of R6 and R 7 is hydrogen and the other is C6_io aryl, or C5-10 heterocyclyl optionally substituted with 1 to 3 groups of R a
- X is nitrogen
- R3 is CHR 4 R ⁇
- one of R4 and R.5 is Ci -6 alkyl and the other is C6-10 aryl, or C5-10 heterocyclyl, said aryl and heterocyclyl optionally substituted with 1 to 3 groups of R a .
- a sub-embodiment of this invention is realized when said aryl and heterocyclyl in R 4 , R5, R6 5 and R 7 are selected from the group consisting of phenyl, napthyl, furanyl, piperonyl, oxazolyl, oxadiazolyl, quinolyl, isoquinolyl, triazolyl, pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl, and thiazolyl, preferably phenyl or pyridyl.
- Still another sub-embodiment of the compound of formula II is realized when A is dihydro-isoxazolyl, and R6 and R7 are combined with a carbon atom on the ring they are attached to form a 4 to 6 membered spirocycle.
- A is oxazolyl
- one of R6 and R7 is hydrogen and the other is C ⁇ -io aryl, or C5-10 heterocyclyl optionally substituted with 1 to 3 groups of R a
- X is nitrogen
- R3 is CHR 4 RS
- one of R 4 and R5 is C 1-6 alkyl and the other is C6-10 aryl, or C5-10 heterocyclyl, said aryl and heterocyclyl optionally substituted with 1 to 3 groups of R a .
- a sub-embodiment of this invention is realized when said aryl and heterocyclyl in R 4 , R5 R6 ; and R 7 are selected from the group consisting of phenyl, napthyl, furanyl, piperonyl, oxazolyl, oxadiazolyl, quinolyl, isoquinolyl, triazolyl, pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl, and thiazolyl, preferably phenyl or pyridyl.
- Still another sub-embodiment of the compound of formula II is realized when A is dihydro-isoxazolyl, and R6 and R 7 are combined with a carbon atom on the ring they are attached to form a 4 to 6 membered spirocycle.
- Still another embodiment of the compound of formula II is realized when A is isoxazolyl, one of R 6 and R7 is hydrogen and the other is C6-10 aryl, or C5-10 heterocyclyl optionally substituted with 1 to 3 groups of Ra, X is CH, R3 is CHR 4 R5, and one of R 4 and R5 is C 1-6 alkyl and the other is C6-10 aryl, or C5-I0 heterocyclyl, said aryl and heterocyclyl optionally substituted with 1 to 3 groups of R a .
- a sub-embodiment of this invention is realized when said aryl and heterocyclyl in R 4 , R5, R6, and R7 are selected from the group consisting of phenyl, napthyl, furanyl, piperonyl, oxazolyl, oxadiazolyl, quinolyl, isoquinolyl, triazolyl, pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl, and thiazolyl, preferably phenyl or pyridyl.
- A is dihydro-isoxazolyl
- one of R6 and R7 is hydrogen and the other is CO- 10 aryl, or C5-10 heterocyclyl optionally substituted with 1 to 3 groups of R a
- X is CH
- R3 is CHR 4 R ⁇
- one of R 4 and R 5 is Ci-6 alkyl and the other is C6-10 aryl, or C5-10 heterocyclyl, said aryl and heterocyclyl optionally substituted with 1 to 3 groups of R a .
- a sub-embodiment of this invention is realized when said aryl and heterocyclyl in R 4 , R5, R6 ?
- R7 are selected from the group consisting of phenyl, napthyl, furanyl, piperonyl, oxazolyl, oxadiazolyl, quinolyl, isoquinolyl, triazolyl, pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl, and thiazolyl, preferably phenyl or pyridyl.
- A is oxazolyl
- one of R6 and R 7 is hydrogen and the other is C ⁇ -io aryl > or C5-IO heterocyclyl optionally substituted with 1 to 3 groups of Ra
- X is CH
- R3 is CHR4R5
- one of R4 and R5 is C 1-6 alkyl and the other is C6-10 aryl, or C5_io heterocyclyl, said aryl and heterocyclyl optionally substituted with 1 to 3 groups of R a .
- a sub-embodiment of this invention is realized when said aryl and heterocyclyl in R4, R5 RO 5 and R?
- any variable e.g. aryl, heterocycle, Rl, R ⁇ etc.
- its definition on each occurrence is independent at every other occurrence.
- combinations of substituents/or variables are permissible only if such combinations result in stable compounds.
- R a is -O- and attached to a carbon it is referred to as a carbonyl group and when it is attached to a nitrogen (e.g., nitrogen atom on a pyridyl group) or sulfur atom it is referred to a N-oxide and sulfoxide group, respectively.
- alkyl encompasses groups having the prefix “alk” such as, for example, alkoxy, alkanoyl, alkenyl, and alkynyl and 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 refers to a hydrocarbon radical straight, branched or cyclic containing from 2 to 10 carbon atoms and at least one carbon to carbon double bond.
- alkenyl groups include ethenyl, propenyl, butenyl and cyclohexenyl.
- alkenyl is C2-C6 alkenyl.
- Preferred alkynyl are C2-C6 alkynyl.
- alkenyl alkynyl and other like terms include carbon chains containing at least one unsaturated C-C bond.
- fluoroalkyl refers to an alkyl substituent as described herin containing at least one flurine substituent.
- cycloalkyl refers to a saturated hydrocarbon containing one ring having a specified number of carbon atoms. Examples of cycloalkyl include cyclopropyl, cyclobutyl, cyclopentyl, and cyclohexyl.
- C 1-6 includes alkyls containing 6, 5, 4, 3, 2, or 1 carbon atoms
- alkoxy as used herein, alone or in combination, includes an alkyl group connected to the oxy connecting atom.
- alkoxy also includes alkyl ether groups, where the term 'alkyl' is defined above, and 'ether' means two alkyl groups with an oxygen atom between them.
- suitable alkoxy groups include methoxy, ethoxy, n- propoxy, i-propoxy, n-butoxy, s-butoxy, t-butoxy, methoxymethane (also referred to as 'dimethyl ether'), and methoxyethane (also referred to as 'ethyl methyl ether').
- aryl is intended to mean any stable monocyclic or bicyclic carbon ring of up to 7 members in each ring, wherein at least one ring is aromatic. Examples of such aryl elements include phenyl, napthyl, tetrahydronapthyl, indanyl, or biphenyl.
- heterocycle, heterocyclyl, or heterocyclic represents a stable 5- to 7-membered monocyclic or stable 8- to 11-membered bicyclic heterocyclic ring which is either saturated or unsaturated, and which consists of carbon atoms and from one to four heteroatoms selected from the group consisting of N, O, and S, and including any bicyclic group in which any of the above-defined heterocyclic rings is fused to a benzene ring.
- the heterocyclic ring may be attached at any heteroatom or carbon atom which results in the creation of a stable structure.
- heterocycle or heterocyclic includes heteroaryl moieties.
- heterocyclic elements include, but are not limited to, azepinyl, benzimidazolyl, benzisoxazolyl, benzofurazanyl, benzopyranyl, benzothiopyranyl, benzofuryl, benzothiazolyl, benzothienyl, benzoxazolyl, chromanyl, cinnolinyl, dihydrobenzofuryl, dihydrobenzothienyl, dihydrobenzothiopyranyl, dihydrobenzothiopyranyl sulfone, 1,3-dioxolanyl, furyl, imidazolidinyl, imidazolinyl, imidazolyl, indolinyl, indolyl, isochromanyl, isoindolinyl, isoquinolinyl, isothiazolidinyl, isothiazolyl, isothiazolidinyl, morpholinyl, naphthyrid
- heterocyclic elements include, but are not limited to, azepinyl, benzimidazolyl, benzisoxazolyl, benzofurazanyl, benzopyranyl, benzothiopyranyl, benzofuryl, benzothiazolyl, benzothienyl, benzoxazolyl, chromanyl, cinnolinyl, dihydrobenzofuryl, dihydrobenzothienyl, dihydrobenzothiopyranyl, dihydrobenzothiopyranyl sulfone, furyl, imidazolidinyl, imidazolinyl, imidazolyl, indolinyl, indolyl, isochromanyl, isoindolinyl, isoquinolinyl, isothiazolidinyl, isothiazolyl, isothiazolidinyl, morpholinyl, naphthyridinyl, oxadia
- the heterocyclic group is a heteroaryl group.
- heteroaryl refers to groups having 5 to 14 ring atoms, preferably 5, 6, 9, or 10 ring atoms; having 6, 10, or 14 ⁇ electrons shared in a cyclic array; and having, in addition to carbon atoms, between one and about three heteroatoms selected from the group consisting of N, 0, and S.
- heteroaryl groups include, without limitation, thienyl, benzothienyl, furyl, benzofuryl, dibenzofuryl, pyrrolyl, imidazolyl, pyrazoiyl, pyridyl, pyrazinyl, pyrimidinyl, indolyl, quinolyl, isoquinolyl, quinoxalinyl, tetrazolyl, oxazolyl, thiazolyl, and isoxazolyl.
- the heterocyclic group is fused to an aryl or heteroaryl group. Examples of such fused heterocycles include, without limitation, tetrahydroquinolinyl and dihydrobenzofuranyl.
- heteroaryl represents a stable 5- to 7-membered monocyclic- or stable 9- to 10-membered fused bicyclic heterocyclic ring system which contains an aromatic ring, any ring of which may be saturated, such as piperidinyl, partially saturated, or unsaturated, such as pyridinyl, and which consists of carbon atoms and from one to four heteroatoms selected from the group consisting of N, O and S, and wherein the nitrogen and sulfur heteroatoms may optionally be oxidized, and the nitrogen heteroatom may optionally be quaternized, and including any bicyclic group in which any of the above-defined heterocyclic rings is fused to a benzene ring.
- the heterocyclic ring may be attached at any heteroatom or carbon atom which results in the creation of a stable structure.
- heteroaryl groups include, but are not limited to, benzimidazole, benzisothiazole, benzisoxazole, benzofuran, benzothiazole, benzothiophene, benzotriazole, benzoxazole, carboline, cinnoline, furan, furazan, imidazole, indazole, indole, indolizine, isoquinoline, isothiazole, isoxazole, naphthyridine, oxadiazole, oxazole, phthalazine, pteridine, purine, pyran, pyrazine, pyrazole, pyridazine, pyridine, pyrimidine, pyrrole, quinazoline, quinoline, quinoxaline, tetrazole, thiadiazole, thiazole,
- heterocycloalkyls examples include azetidinyl, pyrrolidinyl, piperidinyl, piperazinyl, morpholinyl, tetrahydrofuranyl, imidazolinyl, pyrolidin-2-one, piperidin-2-one, and thiomorpholinyl.
- heteroatom means O, S or N, selected on an independent basis.
- a moiety that is substituted is one in which one or more hydrogens have been independently replaced with another chemical substituent.
- substituted phenyls include 2-flurophenyl, 3,4-dichlorophenyl, 3-chloro-4-fluoro-phenyl, 2,4fluor-3- propylphenyl.
- substituted n-octyls include 2, 4 dimethyl-5- ethyl-octyl and 3-cyclopentyloctyl. Included within this definition are methylenes (-CH 2 -) substituted with oxygen to form carbonyl (-CO-).
- Suitable substituents include, without limitation, halo, hydroxy, oxo (e.g., an annular -CH- substituted with oxo is -C(O)-), nitro, halohydrocarbyl, hydrocarbyl, aryl, aralkyl, alkoxy, aryloxy, amino, acylamino, alkylcarbamoyl, arylcarbamoyl, aminoalkyl, acyl, carboxy, hydroxyalkyl, , alkanesulfonyl, arenesulfonyl, alkanesulfonamido, arenesulfonamido, aralkylsulfonamido, alkylcarbonyl, acyloxy, cyano, and ureido groups.
- Preferred substituents, which are themselves not further substituted are:
- Halogen refers to fluorine, chlorine, bromine and iodine.
- the term “mammal” “mammalian” or “mammals” includes humans, as well as animals, such as dogs, cats, horses, pigs and cattle.
- phrases "effective amount” or “therapeutically effective amount” mean a concentration of P2X receptor complex modulator sufficient to inhibit or enhance the effect of the P2X receptor complex.
- Pain means the more or less localized sensation of discomfort, distress, or agony, resulting from the stimulation of specialized nerve endings.
- pain There are many types of pain, including, but not limited to, lightning pains, phantom pains, shooting pains, acute pain, inflammatory pain, neuropathic pain, complex regional pain, neuralgia, neuropathy, tissue injury pain, and the like (Dorland's Illustrated Medical Dictionary, 28th Edition, W. B. Saunders
- the goal of treatment of pain is to reduce the degree or severity of pain perceived by a treatment subject.
- Treating" or “treatment of a disease state includes: 1) preventing the disease state, i.e. causing the clinical symptoms of the disease state not to develop in a subject that may be exposed to or predisposed to the disease state, but does not yet experience or display symptoms of the disease state; 2) inhibiting the disease state, i.e., arresting the development of the disease state or its clinical symptoms; 3) or relieving the disease state, i.e., causing temporary or permanent regression of the disease state or its clinical symptoms.
- the compounds of the present invention may contain one or more asymmetric centers and may thus occur as racemates, racemic mixtures, single enantiomers, diastereomeric mixtures, and individual diastereomers.
- references to the compounds of structural formula I are meant to also include the pharmaceutically acceptable salts, and also salts that are not pharmaceutically acceptable when they are used as precursors to the free compounds or in other synthetic manipulations.
- the compounds of the present invention may be administered in the form of a pharmaceutically acceptable salt.
- pharmaceutically acceptable salts refers to salts prepared from pharmaceutically acceptable non-toxic bases or acids.
- 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.
- Other pharmaceutically acceptable 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
- 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 compounds of the invention (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) NKl 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, xiv) neurontin (gaba
- 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, small fiber neuropathy, 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, HIV and HIV 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 Crohn's 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 tachy-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
- mammals including, but not limited to, cows, sheep, goats, horses, dogs, cats guinea pigs, or other bovine, ovine, equine, canine, feline, rodent such as mouse, species can be treated.
- the method can also be practiced in other species, such as avian species (e.g., chickens).
- 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 monoamine oxidase inhibitors
- RIMAs reversible inhibitors of monoamine oxidase
- SNRJs noradrenaline reuptake inhibitors
- ⁇ -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.
- CRF corticotropin releasing factor
- 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 calcium 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 0.01 mg/kg to about 140 mg/kg of body weight per day are useful in the treatment of inflammatory and neuropathic pain, or alternatively about 0.5 mg to about 7 g per patient per day.
- inflammatory pain may be effectively treated by the administration of from about 0.0 lmg to about 75 mg of the compound per kilogram of body weight per day, or alternatively about 0.5 mg to about 3.5 g per patient per day.
- Neuropathic pain may be effectively treated by the administration of from about 0.01 mg to about 125 mg of the compound per kilogram of body weight per day, or alternatively about 0.5 mg to about 5.5 g 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 0.5 mg to about 5g of active agent, compounded with an appropriate and convenient amount of carrier material which may ary from about 5 to about 95 percent of the total composition.
- Unit dosage forms will generally contain between from about 1 mg to about 1000 mg of the active ingredient, typically 25 mg, 50 mg, 100 mg, 200 mg, 300 mg, 400 mg, 500 mg, 600 mg, 800 mg or 1000 mg.
- 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 of the invention 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 of the invention, 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.
- 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.
- compositions of this invention may include a pharmaceutically acceptable carrier and a compound or a pharmaceutically acceptable salt.
- the compounds of the invention, 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.
- 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 employed.
- tablets may be coated by standard aqueous or nonaqueous techniques.
- controlled release means and/or delivery devices may also be used in administering the instant compounds and compositions.
- 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.
- tablets and capsules are advantageous 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 advantageously contains from about 0.1 mg to about 500 mg of the active ingredient and each cachet or capsule advantageously containing from about 0.1 mg to about 500 mg of the active ingredient.
- a tablet, cachet, or capsule conveniently contains 0.1 mg, 1 mg, 5 mg, 25 mg, 50 mg, 100 mg, 200 mg, 300 mg, 400 mg, or 500 mg 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.
- Pharmaceutical compositions of the present invention suitable for injectable use include sterile aqueous solutions or dispersions. Furthermore, the compositions can be in the form of sterile powders for the extemporaneous preparation of such sterile injectable solutions or dispersions, hi all cases, 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 of the invention, 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 (including anti-oxidants).
- additional carrier ingredients such as diluents, buffers, flavoring agents, binders, surface-active agents, thickeners, lubricants, and preservatives (including anti-oxidants).
- other adjuvants can be included to render the formulation isotonic with the blood of the intended recipient.
- the instant compounds can be utilized in combination with one or more therapeutically active compounds.
- inventive compounds can be advantageously used in combination with i) opiate agonists or antagonists, ii) other calcium channel antagonists, iii) 5HT receptor agonists or antagonists, including 5-HT 1A agonists or antagonists, and 5-HT 1 A partial agonists, iv) sodium channel antagonists, v) N-methyl-D- aspartate (NMDA) receptor agonists or antagonists, vi) COX-2 selective inhibitors, vii) neurokinin receptor 1 (NKl) 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)
- the present compounds can be prepared according to the procedures provided in the Examples.
- the following Examples further describe, but do not limit, the scope of the invention.
- 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 300 MHz, 400 MHz or 500 MHz 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.
- the procedures described herein for synthesizing the compounds may include one or more steps of protecting group manipulations and of purification, such as, re-crystallization, distillation, column chromatography, flash chromatography, thin-layer chromatography (TLC), radial chromatography and high-pressure chromatography (HPLC).
- the products can be characterized using various techniques well known in the chemical arts, including proton and carbon- 13 nuclear magnetic resonance ( 1 H and 13 C NMR), infrared and ultraviolet spectroscopy (IR and UV), X-ray crystallography, elemental analysis and HPLC and mass spectrometry (HPLC-MS).
- Methods of protecting group manipulation, purification, structure identification and quantification are well known to one skilled in the art of chemical synthesis.
- solvents are those which will at least partially dissolve one or all of the reactants and will not adversely interact with either the reactants or the product.
- Suitable solvents are 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-butanol
- 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
- compounds of this invention contain one or more stereocenters that may be prepared as single enantiomers or diastereomers, or as mixtures containing two or more enantiomers or diastereomers in any proportion.
- the compounds of the present invention can be prepared readily according to the following Schemes and specific examples, or modifications thereof, using readily available starting materials, reagents and conventional synthesis procedures. In these reactions, it is also possible to make use of variants which are themselves known to those of ordinary skill in this art but are not mentioned in greater detail.
- the general procedures for making the compounds claimed in this invention can be readily understood and appreciated by one skilled in the art from viewing the following Schemes.
- Isoxazoles can be prepared according to Scheme 1. Bromide 1 is oxidized to aldehyde 2_ which can be coupled with a range of aryl boronic acids under transition metal catalysis to give biaryl 3. Condensation with hydroxylamine gives oxime 4. Chlorination is followed by direct cyclization with a variety of alkynes to deliver isoxazole 5. Final deprotection and amide coupling under standard conditions gives the product 6.
- isoxazoles can be prepared as depicted in Scheme 2, in which the synthetic steps have been reordered to allow for the production of the isoxazoles as the ultimate step.
- Isoxazolines can be prepared according to Scheme 3. Chlorination of oxime 4 is followed by direct cyclization with a variety of alkenes to deliver isoxazoline 8. Final deprotection and amide coupling under standard conditions gives the product 9.
- isoxazolines can be prepared as depicted in Scheme 4, in which the synthetic steps have been reordered to allow for the production of the isoxazoline as the ultimate step.
- isoxazolines can be prepared as depicted in Scheme 5, in which the synthetic steps have been reordered to allow for the construction of the biaryl core as the ultimate step.
- Amine intermediates of type J_8 can be prepared from one of several intermediates as shown in Scheme 6. This method utilizes diastereoselective Ellman sulfinimine addition chemistry to generate a pair of diastereomeric sulf namides. The diastereomers are separated by silica chromatography prior to HCl deprotection to give 18. Depending on the substrate either the R OT S Ellman reagent is utilized to favor the desired alpha methyl amino compound with the preferred stereo configuration shown.
- the final product may be further modified, for example, by manipulation of substituents.
- substituents may include, but are not limited to, reduction, oxidation, alkylation, acylation, and hydrolysis reactions which are commonly known to those skilled in the art.
- order of carrying out the foregoing reaction schemes may be varied to facilitate the reaction or to avoid unwanted reaction products.
- the vessel was cooled to ambient temperature and the reaction was repressurized with carbon monoxide to 300 psi.
- the vessel was heated to 90 0 C for an additional 4 h.
- the vessel was cooled to ambient temperature and the remaining carbon monoxide was vented.
- the mixture was concentrated to half of the volume.
- Ethyl acetate (500 mL) and water (300 mL) were added.
- the organic layer was isolated and the aqueous layer was extracted with ethyl acetate (2x).
- the combined organic extracts were washed with brine, dried over sodium sulfate, filtered and concentrated. Purification by silica gel chromatography (100% hexanes ⁇ 70% hexanes/ ethyl acetate) gave the title compound (16 g). MS 170.0 (M+ 1).
- Step C JV-
- Step D JV-[CIi?)-! -(5-Fluoropyridin-2-yl ' )ethyll-2-methylpropane-2-sulfinamide
- Step B 2-methyl-N- ⁇ ( IR)-I- [6-(trifluoromethyl)-3 -pyridinyl] ethyl ⁇ -2-propanesulfinamide
- Step A Benzyl [(liS)-2-amino-l-methyl-2-thioxoethyl]carbamate
- Step B Benzyl r ⁇ 5)-l-(4H-1.2.4-triazol-3-vnethyllcarbamate
- Step C (15)-l-(4H-l,2,4-Triazol-3-vnethanamine
- Step A tert-Butyl [(IR)-I -(5 -fluoropyridin-2-yOethyl] carbamate
- Step B tert-Butyl [(l/?)-l-(5-fluoro-l-oxidopyridin-2-yl)ethyl]carbamate
- Step C (li?yi-(5-Fluoro-l-oxidopyrindin-2-vPethanamine To a solution of tert-butyl [(li?)-l-(5-fluoro-l-oxidopyridin-2-yl)ethyl]carbamate
- Step A tert-butyl ⁇ (li?)-l-[6-(trifluoromethyl)-3-pyridinyl1ethvUcarbamate
- Step B tert-butyl ⁇ (li?)-l-
- Step A tert-butyl
- Step B (lRVl-C3-methyl-1.2,4-oxadiazol-5-yl)ethanamine
- Step B tert-butyl methyl 5-bromoisophthalate
- Step D tert-butyl 3-bromo-5-formylbenzoate
- Step E t ⁇ rt-Butyl 3-bromo-5-r(E)-(hvdroxyimino)methyllbenzoate
- hydroxylamine hydrochloride 44.0 g, 633 mmol
- pyridine 103 mL, 1.27 mol
- the reaction mixture was heated to 68 0 C. After 16 h, the mixture was concentrated. Saturated aqueous amonium chloride was added the mixture was extracted with dichloromethane (3x). The combined organic extracts were washed with brine, dried over magnesium sulfate, filtered and concentrated (125.0 g).
- MS 243 M - tert-butyl
- Step F tert-Butyl 3-bromo-5-[(5i?)-5-pyridin-2-yl-4,5-dihvdroisoxazol-3-yl]benzoate and tert- buryl 3-bromo-5-[(5SV5-pwidin-2-yl-4,5-dihvdroisoxazol-3-yl '
- benzoate To a solution of tert-butyl 3-bromo-5-[(E)-
- Step B tert-butyl 3-bromo-5-[(iTKhvdroxyirnino)methyl]benzoate
- Step C tert-butyl 3-bromo-5-(5-oxa-6-azaspiro[3.4]oct-6-en-7-yl ' )ben2oate
- Step B 3-( ' 5-Methylpyridin-2-yl)-5-
- Step C N-rriieVl -(5-Fluoropyridin-2-vnethyl1-3-( ' 5-methylpyridin-2-vn-5-r(5 ⁇ )-5-pyridin-2-yl- 4,5-dihvdroisoxazol-3-yl]benzamide
- Step A 3-(5-Methylpyridin-2-ylV5-f(5i?)-5-pyridin-2-yl-4,5-dihydroisoxazol-3-yl]benzoic acid
- Step A and B N-r(li?Vl-( ' 5-Fluoropyridin-2-vnethyl1-3-( ' 5-methylpyridin-2-ylV5-r( ' 5igV5-pyridin-2-yl- 4.5-dihvdroisoxazol-3-yl]benzamide
- Step A 3 -(5 -methyl-2- ⁇ yridinyl)-N- ⁇ ( 1 R)- 1 - ⁇ 1 -oxido-6-(trifluoromethvn-3 -pyridinyliethyl 1-5-
- Step B 3-bromo-N-[ ⁇ i?Vl-( ' 5-fluoro-2-pyridmvnethvn-5-rr5 ⁇ -5-( ' 2-pyridinylV4.5-dihvdro-3- isoxazolyllbenzamide
- Step C ⁇ f -rriigVl-r5-fluoro-2-pyridinvnethyl1-3-r(55)-5-( ' 2-pyridinylV4.5-dihvdro-3-isoxazolyl1- 5-C4.4.5,5-tetramethyl-l,3,2-dioxaborolan-2-yl)benzamide
- Step D 3-r5-chloro-2-pyridinvn-iV-f(li?Vl -(5-fluoro-2-pyridinvnethvn-5-r(5 ⁇ -5-r2-pyridinvn- 4.5-dihydro-3-isoxazolyl]benzamide
- Step A methyl 3-(5-methyl-2-pyridinyl)-5-vinylbenzoate
- Step B 3-(5-methyl-2-pyridinylV5-vinylbenzoic acid
- Step C N-F(Ii?)-! -(5-fluoro-2-pyridinv ⁇ ethyll-3-(5-methyl-2-pyridinyl ' )-5-vinylbenzamide
- N,N-dimethylformamide 20 mL
- Step D N-Fd ⁇ )-I -( ' 5-fluoro-2-pyridinyl ' )ethyl1-3-formyl-5-( ' 5-methyl-2-pyridiny ⁇ benzamide
- N-[(li?)-l-(5-fluoro-2-pyridinyl)ethyl]-3-(5-methyl-2- pyridinyl)-5-vinylbenzamide (1.14 g, 3.15 mmol) in tetrahydrofuran (11 mL) and water (11 mL) were added sodium periodate (2.0 g, 9.45 mmol) and osmium tetroxide (2.5% in tert-butanol, 2.0 mL, 0.157 mmol).
- Step E N- ⁇ (IRY ⁇ -r5-fluoro-2-pyridinyl)ethyll-3-[( ' E)-rhvdroxyimino)methyl1-5-( ' 5-methyl-2- pyridinv ⁇ benzamide
- Step F 3-( ⁇ [(lJ?)-l-(5-fluoro-2-pyridinyl)ethyl1aminolcarbony ⁇ -N-hydroxy-5-(5-methyl-2- pyridinyPbenzenecarboximidoyl chloride
- Step G N-r(li?Vl-r5-fluoro-2-pyridinvnethyll-3-r5-hvdroxy-5-(2-pyridinylV4.5-dihvdro-3- isoxazolyll -5 -(5 -methyl -2 -pyridinvObenzamide
- reaction mixture was sequentially added (1 equivalent, ⁇ 5 mL, per portion) to a solution of 3-( ⁇ [(li?)-l-(5-fluoro-2-pyridinyl)ethyl]amino ⁇ carbonyl)-N-hydroxy-5- (5-methyl-2-pyridinyl)benzenecarboximidoyl chloride (0.765 g, 1.85 mmol) in tetrahydrofuran (4 mL) at -78 °C. After addition of 5 equivalents (-25 mL), the reaction mixture was warmed to 0 °C. Saturated aqueous ammonium chloride was added. The mixture was extracted with dichloromethane (3x).
- Step B 3-(5-methylpyridin-2-ylV5- ⁇ ,3-oxazol-2-y0benzoic acid
- Step C 3-f5-rnethylpyridin-2-vn-5-fl.3-oxazol-2-vn-.V- ( nRVl-ri-oxido-6- ftrifluoromethyl)pyridin-3-yl1ethyl ⁇ benzamide
- Step A tert-butyl 4'-methyl-5-(5-oxa-6-azaspiro[ ' 3.4 '
- tert-butyl 3-bromo-5-(5-oxa-6-azaspiro[3.4]oct-6-en-7- yl)benzoate (1.36 g, 3.71 mmol) in THF (8 mL) and water (8 mL) were added (4- methylphenyl)boronic acid (1.01 g, 7.43 mmol), dichloro[l,l'- bis(diphenylphosphino)ferrocene]palladium(II) dichloromethane adduct (82 mg, 0.11 mmol) and cesium carbonate (3.63 g, 11.1 mmol).
- the mixture was heated to 120 0 C in a microwave reactor for 10 min.
- the mixture was cooled to ambient temperature and saturated aqueous NaHCO 3 was added and the mixture was extracted with ethyl acetate (3x).
- the combined organic extracts were washed with water (2x), brine, dried over sodium sulfate, filtered and concentrated.
- Step B 4'-methyl-5-(5-oxa-6-azaspiro[3.4]oct-6-en-7-yl)biphenyl-3-carboxylic acid
- Step C 4'-Methyl-5-r5-oxa-6-azaspiror3.41oct-6-en-7-vn-iV-rri ⁇ -l-(4H-1.2.4-triazol-3- yllethyllbiphenyl-3-carboxamide
- Step A tert-buty ⁇ 3-(5-methylpyridin-2-yl)-5-(5-oxa-6-azaspiro[3.4]oct-6-en-7-yl ' )berizoate
- tert-butyl 3-bromo-5-(5-oxa-6-azaspiro[3.4]oct-6-en-7- yl)benzoate (1.42 g, 3.88 mmol)
- bis(tri-tert-butylphosphine)palladium(0) 59.0 mg, 0.12 mmol
- dioxane 20 mL
- Step B 3-(5-methylpyridin-2-yl)-5-( ' 5-oxa-6-azaspiro[3.4]oct-6-en-7-v ⁇ benzoic acid
- Step C .V-rO-gy 1 -f3.5-difluoropyrid ⁇ n-2-vnethvn-3-f 5-methylpyrid ⁇ n-2-ylV5-(5-oxa-6- azaspuO[3.4]oct-6-en-7-yl * )benzamide
- mice After overnight food-deprivation, male Sprague-Dawley rats are slightly anesthetized (isoflurane) and injected with 1% acetic acid into the colon (1.5 ml) using a cannula of 5 cm in length. After a recovery period of 75 minutes, rats are again slightly anesthetized (isoflurane) and a latex balloon of 1.5 cm in length tightly attached to a catheter is inserted via the anus into the descending colon and rectum. Anesthesia is then immediately discontinued. 15 minutes later, the test substance is administered p.o. 60 minutes after administration, the balloon is filled with 1.2 ml of water and the number of abdominal contractions is counted for 10 minutes. 10 rats are studied per group. The test is performed blind.
- test substance will be evaluated at 3 doses, and compared with the vehicle group. Rats will be euthanized at the end of the experiments by exposure to a mixture of O 2 /CO 2 (20%/80%) followed by CO 2 . Data will be analyzed by comparing treated groups with vehicle control using Mann Whitney U tests.
- spinal nerve ligation For the spinal nerve ligation (SNL) procedure, male Sprague Dawley rats (100-200 g; Harlan) are anesthetized using isoflurane (1-5%; inhalation). Using aseptic technique, a dorsal midline incision is made from approximately spinal nerve L3 to S2. A combination of sharp and blunt dissection is used to expose the L6/S1 posterior interarticular process. The L6 transverse process is visualized and removed, and the L4 and L5 spinal nerves are exposed distal to their emergence from the intervertebral foramina. The L5 nerve is then tightly ligated with 6-0 silk suture. The muscle is closed with 4-0 absorbable suture and the skin is closed with wound clips.
- SNL spinal nerve ligation
- Postoperative monitoring is carried out to assure that animals are exposed to the least amount of pain as possible. Animals are housed in pairs on bedding and are monitored (2x) daily for three days post-operatively by Laboratory Animal Resource staff and then daily by investigator for any signs of possible distress.
- Behavioral testing Prior to surgery, rats are tested for pre-surgery mechanical hind paw withdrawal thresholds by applying a series of calibrated von Frey filaments (0.25 - 15 g) to the left hind paw and determining the median withdrawal threshold using the Dixon "up-down" method (Chaplan et al., J Neurosci Meth 53:55, 1994). Rats are placed in individual plastic chambers on an elevated mesh galvanized steel platform and allowed to acclimate for 60 min.
- CFA Complete Freunds adjuvant
- mice Male Sprague Dawley rats (300-400 g; Charles River) receive an intradermal injection of CFA (200 ul, 0.5 mg/ml) into the plantar aspect of the left hind paw and are subsequently returned to their cages where they are maintained on soft bedding. 72 hrs following CFA injection rats are tested for post-CFA mechanical hind paw withdrawal thresholds by wrapping the rat in a towel and placing the hind paw (either left or right) in a modified Randall-Sellito paw pinch apparatus (Stoelting, Wood Dale, IL).
- CFA 200 ul, 0.5 mg/ml
- 72 hrs following CFA injection rats are tested for post-CFA mechanical hind paw withdrawal thresholds by wrapping the rat in a towel and placing the hind paw (either left or right) in a modified Randall-Sellito paw pinch apparatus (Stoelting, Wood Dale, IL).
- a plastic bar attached to a lever is placed on the dorsum of the hind paw, and an increasing force is applied to the hind paw until the rat vocalizes or pulls its hind paw away from the bar.
- the rat's hind paw withdrawal threshold is recorded at that point.
- the mechanical stimulus is applied to each hind paw 2 times, and the average post- CFA mechanical hind paw withdrawal thresholds are determined for both the left and right hind paw.
- rats receive test compound, vehicle, or the positive comparator naproxen (30 mg/kg, p.o.), and effects of compounds on withdrawal thresholds for the inflamed (CFA) hind paw are determined.
- Efficacy in the CFA model is evaluated by determining the % reversal of mechanical hypersensitivity using the formula:
- the intravesical pressure was measured using a pressure transducer, and signal was recorded using a multiple channel data acquisition system (Power lab, AD Instruments, Biopac systems, Colorado Springs, CO) at a sampling rate of 10 Hz. After confirming stable inter-micturtion interval and micturition pressure by intravesical infusion of saline, the drugs were administered intravenously (0.25 ml/kg). Intermicturition interval (functional bladder capacity) and micturition pressure (maximum intravesical pressure) were obtained from micturitions prior to dosing (baseline) and between 5 to 30 min after dosing using Chart program (v5.5.4, AD Instruments), and calculated the ratio to baseline.
- Intermicturition interval functional bladder capacity
- micturition pressure maximum intravesical pressure
- mice Female Sprague-Dawley rats weighed 250-350 g were housed in a temperature- and light (12-h light/dark cycle)-controlled room, and were allowed access to food and water ad libitum. The animals were anesthetized with urethane (1.0 g/kg, i.p.). Supplemental urethane was given if necessarily. A lower abdominal midline incision was made to expose the bladder, and a polyethylene catheter (PE-50) was inserted into the bladder dome for recording the intravesical pressure and intravesical infusion at the rate of 0.05 ml/min.
- PE-50 polyethylene catheter
- the intravesical pressure was measured using a pressure transducer, and signal was recorded using a multiple channel data acquisition system (Power lab, AD Instruments, Biopac systems, Colorado Springs, CO) at a sampling rate of 10 Hz. After confirming stable inter-micturtion interval and micturition pressure by intravesical infusion of saline, 0.25% of acetic acid-saline solution was infused at the same infusion rate. After 30-60 min, drugs were intravenously infused using infusion pumps at a rate of 10 ⁇ l/min.
- Intermicturition interval functional bladder capacity
- micturition pressure maximal intravesical pressure
- Human P2X$ and P2X2 /3 Stable Cell Line - Human P2X 3 receptor cDNA (Accession number NM_002559) was subcloned as a 5'XhoI and 3'HindIII fragment into the expression vector pcDNA5/FRT (Invitrogen).
- Human P2X 2 receptor cDNA (Accession number NM l 74873) was subcloned as a 5 ⁇ coRI and 3'NotI fragment into the expression vector pIRESneo2 (BD Biosciences Clontech).
- the human P2X 3 expression construct was transfected using Lipofectamine 2000 (Invitrogen) into Flp-in - 293 cells (Invitrogen) according to the manufacturer's directions.
- the stable human P2X 3 cell line was co-transfected with the human P2X 2 expression construct using Lipofectamine 2000 as above and co-transfected cells selected using 100 mg/ml hygromycin and 1 mg/ml G418.
- the stable P2X 3 cell line was propagated in DMEM, 10% FBS, 100 ⁇ g/ml hygromycin, and 100 units/ml penicillin and 100 ⁇ g/ml streptomycin, and maintained at 37 ° and 95% humidity.
- the stable P2X 2/3 cell line was propagated as above with the addition of 500 ⁇ g/ml G418.
- Intracellular Calcium Measurement to Assess Antagonist Affinity A fluorescent imaging plate reader (FLIPR; Molecular Devices) was used to monitor intracellular calcium levels using the calcium-chelating dye Fluo-4 (Molecular Probes). The excitation and emission wavelengths used to monitor fluorescence were 488 run and 530 nm, respectively. Cells expressing either human P2X 3 or human P2X 2/3 were plated at a density of 20,000 cells/well (20 ⁇ l/well) in 384- well black- walled plates approximately 20 hours before beginning the assay.
- FLIPR fluorescent imaging plate reader
- the bath solution contained 150 mM NaCl, 4 mM KCl, 2 mM CaCl 2 , 1.2 mM
- the control P2X 3 current amplitude (Ip 2 ⁇ 3 -( Co n t r o i)) was taken as an average of the peak current amplitude from the last two agonist additions prior to incubation with an antagonist.
- the peak P2X 3 current amplitude in the presence of an antagonist (Ip 2 X 3- (CIrUg)) was used to calculate the inhibitory effect at each concentration of the antagonist according to the following equation:
- % inhibition of P2X 3 100*(Ip 2 ⁇ 3- ( CO ntrol)-Ip2X3-(drug))/Ip2X3-(controI)
- concentration of an antagonist was tested on at least two independent cells.
- concentration of drug required to inhibit P2X 3 current by 50% was determined by fitting of the Hill equation to the averaged % inhibition data at each concentration:
- the compounds below have an IC 50 of 200 nM or less in the "Intracellular Calcium Measurement to Assess Antagonist Affinity" assay:
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AU2008319309A AU2008319309B2 (en) | 2007-10-31 | 2008-10-29 | P2X3 receptor antagonists for treatment of pain |
ES08844889.9T ES2553412T3 (en) | 2007-10-31 | 2008-10-29 | P2X3 receptor antagonists for pain management |
JP2010532049A JP5552430B2 (en) | 2007-10-31 | 2008-10-29 | P2X3 receptor antagonist for the treatment of pain |
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EP2215048B1 (en) | 2015-10-28 |
EP2215048A1 (en) | 2010-08-11 |
ES2553412T3 (en) | 2015-12-09 |
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CA2703915C (en) | 2015-02-24 |
AU2008319309B2 (en) | 2012-09-06 |
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JP2011502149A (en) | 2011-01-20 |
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