AU741981B2 - (Methylsulfonyl)phenyl-2-(5H)-furanones with oxygen link as cox-2 inhibitors - Google Patents

(Methylsulfonyl)phenyl-2-(5H)-furanones with oxygen link as cox-2 inhibitors Download PDF

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Publication number
AU741981B2
AU741981B2 AU67142/98A AU6714298A AU741981B2 AU 741981 B2 AU741981 B2 AU 741981B2 AU 67142/98 A AU67142/98 A AU 67142/98A AU 6714298 A AU6714298 A AU 6714298A AU 741981 B2 AU741981 B2 AU 741981B2
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Prior art keywords
furan
dimethyl
methylsulfonylphenyl
compound according
mono
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AU67142/98A
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AU6714298A (en
Inventor
Erich Grimm
Yves Leblanc
Serge Leger
Patrick Roy
Zhaoyin Wang
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Merck Canada Inc
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Merck Frosst Canada and Co
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Priority claimed from AU71236/96A external-priority patent/AU703871B2/en
Priority claimed from AU72736/96A external-priority patent/AU711902C/en
Application filed by Merck Frosst Canada and Co filed Critical Merck Frosst Canada and Co
Priority to AU67142/98A priority Critical patent/AU741981B2/en
Priority claimed from PCT/CA1998/000225 external-priority patent/WO1998041516A1/en
Publication of AU6714298A publication Critical patent/AU6714298A/en
Assigned to MERCK FROSST CANADA & CO. reassignment MERCK FROSST CANADA & CO. Alteration of Name(s) of Applicant(s) under S113 Assignors: MERCK FROSST CANADA INC.
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Publication of AU741981B2 publication Critical patent/AU741981B2/en
Assigned to MERCK FROSST CANADA LTD. reassignment MERCK FROSST CANADA LTD. Alteration of Name(s) in Register under S187 Assignors: MERCK FROSST CANADA & CO.
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D407/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having oxygen atoms as the only ring hetero atoms, not provided for by group C07D405/00
    • C07D407/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having oxygen atoms as the only ring hetero atoms, not provided for by group C07D405/00 containing two hetero rings
    • C07D407/12—Heterocyclic compounds containing two or more hetero rings, at least one ring having oxygen atoms as the only ring hetero atoms, not provided for by group C07D405/00 containing two hetero rings linked by a chain containing hetero atoms as chain links
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
    • C07D307/02—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings
    • C07D307/34—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
    • C07D307/56—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D307/60—Two oxygen atoms, e.g. succinic anhydride

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Furan Compounds (AREA)
  • Catalysts (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Description

I I WO 98/41516 PCT/CA98/00225 TITLE OF THE INVENTION WITH OXYGEN LINK AS COX-2 INHIBITORS.
BACKGROUND OF THE INVENTION This invention relates to methods of treating cyclooxygenase mediated diseases and certain pharmaceutical compositions therefor.
Non-steroidal, antiinflammatory drugs exert most of their antiinflammatory, analgesic and antipyretic activity and inhibit hormone-induced uterine contractions and certain types of cancer growth through inhibition of prostaglandin G/H synthase, also known as cyclooxygenase. Initially, only one form of cyclooxygenase was known, this corresponding to cyclooxygenase-1 (COX-1) or the constitutive enzyme, as originally identified in bovine seminal vesicles.
More recently the gene for a second inducible form of cyclooxygenase, cyclooxygenase-2 (COX-2) has been cloned, sequenced and characterized initially from chicken, murine and human sources. This enzyme is distinct from the COX-1 which has been cloned, sequenced and characterized from various sources including the sheep, the mouse and man. The second form of cyclooxygenase, COX-2, is rapidly and readily inducible by a number of agents including mitogens, endotoxin, hormones, cytokines and growth factors. As prostaglandins have both physiological and pathological roles, we have concluded that the constitutive enzyme, COX-1, is responsible, in large part, for endogenous basal release of prostaglandins and hence is important in their physiological functions such as the maintenance of gastrointestinal integrity and renal blood flow. In contrast, we have concluded that the inducible form, COX-2, is mainly responsible for the pathological effects of prostaglandins where rapid induction of the enzyme would occur in response to such agents as inflammatory agents, hormones, growth factors, and cytokines. Thus, a selective inhibitor of COX-2 will have similar antiinflammatory, antipyretic and analgesic properties to a conventional non-steroidal antiinflammatory drug, and in addition would inhibit hormone-induced uterine contractions and have potential anti-cancer effects, but will have a diminished ability to induce some of the mechanism-based side effects. In particular, such a compound
(I,
WO 98/41516 PCT/CA98/00225 should have a reduced potential for gastrointestinal toxicity, a reduced potential for renal side effects, a reduced effect on bleeding times and possibly a lessened ability to induce asthma attacks in aspirin-sensitive asthmatic subjects.
Furthermore, such a compound will also inhibit prostanoid-induced smooth muscle contraction by preventing the synthesis of contractile prostanoids and hence may be of use in the treatment of dysmenorrhea, premature labour, asthma and eosinophil related disorders. It will also be of use in the treatment of Alzheimer's disease, for decreasing bone loss particularly in postmenopausal women treatment of osteoporosis) and for the treatment of glaucoma.
A brief description of the potential utility of cyclooxygenase-2 inhibitors is given in an article by John Vane, Nature, Vol. 367, pp. 215- 216, 1994, and in an article in Drug News and Perspectives, Vol. 7, pp.
501-512, 1994.
SUMMARY OF THE INVENTION The invention encompasses the novel compound of Formula I as well as a method of treating cyclooxygenase-2 mediated diseases comprising administration to a patient in need of such treatment of a non-toxic therapeutically effective amount of a compound of Formula I.
R
R'SO
2 O p2 0
R
2 R3
I
The invention also encompasses certain pharmaceutical compositions for treatment of cyclooxygenase-2 mediated diseases comprising compounds of Formula I.
DETAILED DESCRIPTION OF THE INVENTION The invention encompasses the novel compound of Formula I as well as a method of treating cyclooxygenase-2 mediated diseases WO 98/41516 PCT/CA98/00225 comprising administration to a patient in need of such treatment of a non-toxic therapeutically effective amount of a compound of Formula I.
R
R'SO2 R 0 SR3
I
wherein: R is a mono-, di- or tri-substituted C1-12alkyl, or a mono-, or an unsubstituted or mono-, di- or tri-substituted linear or branched C2- 10alkenyl, or an unsubstituted or mono-, di- or tri-substituted linear or branched C2-10alkynyl, or an unsubstituted or mono-, di- or trisubstituted C3-12cycloalkenyl, or an unsubstituted or mono-, di- or trisubstituted C5-12cycloalkynyl, wherein the substituents are chosen from the group consisting of halo, selected from F, Cl, Br, and I,
OH,
CF3, C3-6cycloalkyl,
=O,
dioxolane, CN and R1 is selected from the group consisting of CH3, NH2, NHC(O)CF3, NHCH3; R2 and R3 are independently chosen from the group consisting of hydrogen, C1-10alkyl, or R 2 and R3 together with the carbon to which they are attached form a saturated monocyclic carbon ring of 3, 4, 5, 6 or 7 atoms.
A preferred embodiment of this invention is that wherein R is a mono-, di-, or trisubstituted linear or branched Cl-lo alkyl or a mono-, di-, or tri-substituted C3- 1 2 cycloalkyl.
Another preferred embodiment is that wherein the substituent on R is halo.
Another preferred embodiment is that wherein R 2 and R 3 are each methyl.
Another preferred embodiment is that wherein R' is CH 3 or NH 2 In another aspect the invention also encompasses a pharmaceutical composition for treating an inflammatory disease susceptible to treatment with a non-steroidal antiinflammatory agent comprising: a non-toxic therapeutically effective amount of a compound of formula I and a pharmaceutically acceptable carrier.
In another aspect the invention also encompasses a pharmaceutical composition for treating cyclooxygenase mediated diseases advantageously treated by an active agent that •selectively inhibits COX-2 in preference to COX-1 comprising: 15 a non-toxic therapeutically effective amount of a compound of formula I and a pharmaceutically acceptable carrier.
In another aspect the invention also encompasses a method of treating an inflammatory disease susceptible to treatment with a non-steroidal anti-inflammatory agent comprising: 20 administration to a patient in need of such treatment of a non-toxic therapeutically effective amount of a compound of formula I and a pharmaceutically acceptable carrier.
•In another aspect the invention also encompasses a method of treating cyclooxygenase mediated diseases advantageously treated by an active agent that selectively inhibits COX-2 in preference to COX-1 comprising: administration to a patient in need of such treatment of a non-toxic therapeutically effective amount of a compound of formula I.
In another aspect of the invention there is provided a compound of formula I or a pharmaceutical composition comprising a compound of formula I when used in treating cyclooxygenase mediated diseases advantageously treated by an active agent that selectively inhibits COX-2 in preference to COX-1.
In another aspect of the invention there is provided use of a compound of formula I, in the manufacture of a medicament for treating cyclooxygenase mediated diseases advantageously treated by an active agent that selectively inhibits COX-2 in preference to COX-1.
[I:\DAYLIB\LIBH]28601 .doc:SAK 4a In another aspect of the invention there is provided a compound of formula I or a pharmaceutical composition comprising a compound of formula I, when used in treating an inflammatory disease susceptible to treatment with an non-steroidal anti-inflammatory agent.
In another aspect of the invention also encompasses the use of a compound of formula I or a pharmaceutical composition in the manufacture of a medicament for the treatment of an inflammatory *e i ft [I:\DAYLIB\LIBH]28601 .doc:SAK WO 98/41516 PCT/CA98/00225 disease susceptable to treatment with a non-steroidal anti-inflammatory agent.
The invention is illustrated by the compounds of the Examples disclosed herein as well as the compounds of Table 1.
1) Definitions The following abbreviations have the indicated meanings: AA arachidonic acid Ac acetyl CHO chinese hamster ovary CMC -cyclohexyl-3-(2-morpholinoethyl) carbodiimidemetho-p-toluenesulfonate Cox cyclooxygenase DAST diethlyaminosulfur trifluoride DBU diazabicyclo[5.4.01undec7-ene DMAP 4 -(dimethylamino)pyridine DMF N,N-dimethylformamide Et3N =triethylamine HBSS =Hanks balanced salt solution HEPES [2-Hydroxyethyl] piperazine-N 1 ethanesulfonic acid] HWB human whole blood IPA isopropyl alcohol LPS lipopolysaccharide MMPP magnesium monoperoxyphthalate Ms =methanesulfonyl mesyl MsO methanesulfonate mesylate NSAID non-steroidal anti-inflammatory drug Oxone® potassium peroxymonosulfate r.t. =room temperature rac. =racemic TBAF =tetra-n-butylammonim fluoride Tf trifluoromethanesulfonyl triflyl, WO 98/41516 PCT/CA98/00225 THF tetrahydrofuran TLC thin layer chromatography SO2Me methyl sulfone also SO2CH 3 SO2NH 2 sulfonamide WO 98/41516 PCT/CA98/00225 Allrvl arnrm abreviatQ i o T A I LL VU.9 U U *LmJ^ *IV AIJ.VJLJA" Me Et n-Pr i-Pr n-Bu i-Bu s-Bu t-Bu c-Pr c-Bu c-Pen c-Hex methyl ethyl normal propyl isopropyl normal butyl isobutyl secondary butyl tertiary butyl cyclopropyl cyclobutyl cyclopentyl cyclohexyl bid qid id Dose Abbreviations bis in die twice daily quater in die four times a day ter in die three times a day For purposes of this specification "Alkyl" means linear branched and cyclic structures, and combinations thereof, containing the indicated number of carbon atoms. Examples of alkyl groups include methyl, ethyl, propyl, isopropyl, butyl, s- and t-butyl, pentyl, hexyl, heptyl, octyl, nonyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, eicosyl, 3,7-diethyl-2,2-dimethyl- 4 -propylnonyl, cyclopropyl, cyclopentyl, cycloheptyl, adamantyl, cyclododecylmethyl, 2-ethyl-1bicyclo[4.4.0]decyl and the like.
For purposes of this specification "Fluoro alkyl" means alkyl groups in which one or more hydrogen is replaced by fluorine.
Examples are -CF3, -CH2CH2F, -CH2CF3, c-Pr-F5, c-Hex-F11 and the like.
For purposes of this specification "Alkoxy" means alkoxy groups of the indicated number of carbon atoms of a straight, branched, or cyclic configuration. Examples of alkoxy groups include methoxy, ethoxy, propoxy, isopropoxy, cyclopropyloxy, cyclohexyloxy, and the like.
For purposes of this specification "Alkylthio" means alkylthio groups of the indicated number of carbon atoms of a straight, branched or cyclic configuration. Examples of alkylthio groups include methylthio, propylthio, isopropylthio, cycloheptylthio, etc. By way of illustration, the propylthio group signifies -SCH2CH2CH 3 WO 98/41516 WO 9841516PCT/CA98/00225 For purposes of this specification "Halo" means F, Cl, Br, or Exemplifying the invention are Examples hereinunder which include: 5,5-Dimethyl-3-(( l-methylallyl)oxy)-4-(4-methylsulfonylphelyl).5H.
furan-2-one 5,5-Dimethyl-3-( 1,1,1 3 ,3,3-hexafluoropropoxy)-4-(4methylsulfonylphenyl)-5H-furan-2.one 5,5-Dimethyl-3-((l-methyl-2-propynyl)oxy)4(4.
methylsulfonylphenyl)-5H-furan.2-.one 1R,2S)-( iS, 2
R)-
2 -hydroxy-1-methylpropyl)oxy).s,5-dcimethy..4 4 -methylsulfonylphenyl)-5H-furan.2one 3 2 -hydroxy-2-methyl-3-butenyl)oxy).s,5imethyl.4(4.
methylsulfonyl)phenyl-5H-furan-2-one 3 2 -Bromo-l-methylethoxy)-,5-dimethyl4(4methylsulfonylphenyl)-5H-furan-2.one 3 -(Isopropenyloxy)-5,5-dimethyl-4(4methylsulfonylphenyl)>5Hfuran-2-one 3 2
S)-
3 -hydroxy-2-methylpropyl)oxy)-5s,5-dimethyl-4(4methylsulfonylphenyl)-5H.furan.2-.one 3 2 R)-3-hydroxy-2-methylpropyl)oxy).s,.dimethyl4(4.
methylsulfonylphenyl)-5H..furan.2one 3 -(((2R)-3-Fluoro-2-methylpropyl)oxy)-5s,5-dimethyl-4-(4methylsulfonylphenyl)-5H-furan.2-one (11) 3 2
S)-
3 -fluoro-2-methylpropyl)oxy)-s ,5-dimethyl-4-(4methylsulfonylphenyl)-5H..furan.2one (12) 3 2 -Hydroxy-1-methylethoxy)-,5-dcimethyl-.4-(4.
methylsulfonylphenyl)-5H..fuan2.one (13) 3 2 -Fluoro-l-methylethoxy)-5,5-dimethyp4-(4.
methylsulfonylphenyl)-5H..furan.2.one (14) 5,5-Dimethyl-4-(4-methylsulfonyphenyl)3.(2propynyloxy)-5Hfuran-2 -one 3-(Allyloxy)-5,5-dimethyl-4(4.methylsulfonylphenyl).sH.furan-2 one WO 98/41516 PCT/CA98/00225 (16) 3-(1,4-dioxaspiro [4.51 dec-8-yloxy)-5,5-dimethyl-4-(4methylsulfonylphenyl)-5H-furan-2-one (17) 3- [(4,4-difluorocyclohexyl)oxy] -5,5-dimethyl-4(4- (methylsulfonylphenyl)-5H-furan-2-one (18) 5,5dmty -2mtyallx)--4(ehlufnlhnl-H furan-2- one (19) 5 ,5-Dimethyl-3-[IX -methylcyclopropyl)methoxyJ methylsulfonylphenyl)-5H-furan-2-one 3-f [2-(fluoromethyl)allyl] oxy)-5,5-dimethyl-4-(4methylsulfonylphenyl)-5H-furan-2-one (21) 3-f [l-(hydroxymethyl)cyclopropyllmethoxy) -5 ,5-dimethyl-4-(4methylsulfonylphenyl)-2-5H-furan-2.one (22) 3- l-fluorocyclobutyl)methoxy] -5,5-dimethyl-4-(4methylsulfonylphenyl)-5H-furan-2.one (23) 3-f I -(fiuoromethyl)cyclopropyll methoxy)-5,5-dimethyl-4-(4methylsulfonylphenyl)-5H-furan-2-one (24) 3-(-xccoetloy-,-iety--4mtysloypey) 5H-furan-2-one 3 -((2,2-difluorocyclopentyl)oxy-5 ,5-dimethyl-4-(4methylsulfonylphenyl)-s ,5-furan-2-one Some of the compounds described herein contain one or more asymmetric centers and may thus give rise to diastereomers and optical isomers. The present invention is meant to comprehend such possible diastereomers as well as their racemic and resolved, enantiomerically pure forms and pharmaceutically acceptable salts thereof.
Some of the compounds described herein contain olefinic double bonds, and unless specified otherwise, are meant to include both E and Z geometric isomers.
In a second embodiment, the invention encompasses pharmaceutical compositions for inhibiting cyclooxygenase and for treating cyclooxygenase mediated diseases as disclosed herein comprising a pharmaceutically acceptable carrier and a non-toxic therapeutically effective amount of compound of formula I as described above.
WO 98/41516 PCT/CA98/00225 Within this embodiment the invention encompasses pharmaceutical compositions for inhibiting cyclooxygenase-2 and for treating cyclooxygenase-2 mediated diseases as disclosed herein comprising a pharmaceutically acceptable carrier and a non-toxic therapeutically effective amount of compound of formula I as described above.
In a third embodiment, the invention encompasses a method of inhibiting cyclooxygenase and treating cyclooxygenase mediated diseases, advantageously treated by an active agent that selectively inhibits COX-2 in preference to COX-1 as disclosed herein comprising: administration to a patient in need of such treatment of a non-toxic therapeutically effective amount of a compound of Formula I as disclosed herein.
The pharmaceutical compositions of the present invention comprise a compound of Formula I as an active ingredient, and may also contain a pharmaceutically acceptable carrier and optionally other therapeutic ingredients.
The compound of Formula I is useful for the relief of pain, fever and inflammation of a variety of conditions including rheumatic fever, symptoms associated with influenza or other viral infections, common cold, low back and neck pain, dysmenorrhea, headache, toothache, sprains and strains, myositis, neuralgia, synovitis, arthritis, including rheumatoid arthritis, degenerative joint diseases (osteoarthritis), gout and ankylosing spondylitis, bursitis, burns, injuries, following surgical and dental procedures. In addition, such a compound may inhibit cellular neoplastic transformations and metastic tumor growth and hence can be used in the treatment of cancer.
Compound I may also be of use in the treatment and/or prevention of cyclooxygenase-mediated proliferative disorders such as may occur in diabetic retinopathy and tumour angiogenesis.
Compound I will also inhibit prostanoid-induced smooth muscle contraction by preventing the synthesis of contractile prostanoids and hence may be of use in the treatment of dysmenorrhea, premature labor, asthma and eosinophil related disorders. It will also be of use in WO 98/41516 PCT/CA98/00225 the treatment of Alzheimer's disease, and for the prevention of bone loss (treatment of osteoporosis) and for the treatment of glaucoma.
By virtue of its high cyclooxygenase-2 (COX-2) activity and/or its specificity for cyclooxygenase-2 over cyclooxygenase-1 (COX-1), Compound I will prove useful as an alternative to conventional nonsteroidal antiinflammatory drugs (NSAID'S) particularly where such non-steroidal antiinflammatory drugs may be contra-indicated such as in patients with peptic ulcers, gastritis, regional enteritis, ulcerative colitis, diverticulitis or with a recurrent history of gastrointestinal lesions; GI bleeding, coagulation disorders including anemia such as hypoprothrombinemia, haemophilia or other bleeding problems; kidney disease; those prior to surgery or taking anticoagulants.
Similarly, Compound I, will be useful as a partial or complete substitute for conventional NSAID'S in preparations wherein they are presently co-administered with other agents or ingredients.
Thus in further aspects, the invention encompasses pharmaceutical compositions for treating cyclooxygenase-2 mediated diseases as defined above comprising a non-toxic therapeutically effective amount of the compound of Formula I as defined above and one or more ingredients such as another pain reliever including acetominophen or phenacetin; a potentiator including caffeine; an H2-antagonist, aluminum or magnesium hydroxide, simethicone, a decongestant including phenylephrine, phenylpropanolamine, pseudophedrine, oxymetazoline, ephinephrine, naphazoline, xylometazoline, propylhexedrine, or levodesoxyephedrine; an antiitussive including codeine, hydrocodone, caramiphen, carbetapentane, or dextramethorphan; a prostaglandin including misoprostol, enprostil, rioprostil, ornoprostol or rosaprostol; a diuretic; a sedating or non-sedating antihistamine. In addition the invention encompasses a method of treating cyclooxygenase mediated diseases comprising: administration to a patient in need of such treatment a non-toxic therapeutically effective amount of the compound of Formula I, optionally co-administered with one or more of such ingredients as listed immediately above.
For the treatment of any of these cyclooxygenase mediated diseases Compound I may be administered orally, topically, parenterally, by inhalation spray or rectally in dosage unit formulations -11- WO 98/41516 PCT/CA98/00225 containing conventional non-toxic pharmaceutically acceptable carriers, adjuvants and vehicles. The term parenteral as. used herein includes subcutaneous injections, intravenous, intramuscular, intrasternal injection or infusion techniques. In addition to the treatment of warmblooded animals such as mice, rats, horses, cattle sheep, dogs, cats, etc., the compound of the invention is effective in the treatment of humans.
As indicated above, pharmaceutical compositions for treating cyclooxygenase-2 mediated diseases as defined may optionally include one or more ingredients as listed above.
The pharmaceutical compositions containing the active ingredient may be in a form suitable for oral use, for example, as tablets, troches, lozenges, aqueous or oily suspensions, dispersible powders or granules, emulsions, hard or soft capsules, or syrups or elixirs.
Compositions intended for oral use may be prepared according to any method known to the art for the manufacture of pharmaceutical compositions and such compositions may contain one or more agents selected from the group consisting of sweetening agents, flavoring agents, coloring agents and preserving agents in order to provide pharmaceutically elegant and palatable preparations. Tablets contain the active ingredient in admixture with non-toxic pharmaceutically acceptable excipients which are suitable for the manufacture of tablets.
These excipients may be, for example, inert diluents, such as calcium carbonate, sodium carbonate, lactose, calcium phosphate or sodium phosphate; granulating and disintegrating agents, for example, corn starch, or alginic acid; binding agents, for example starch, gelatin or acacia, and lubricating agents, for example, magnesium stearate, stearic acid or talc. The tablets may be uncoated or they may be coated by known techniques to delay disintegration and absorption in the gastrointestinal tract and thereby provide a sustained action over a longer period. For example, a time delay material such as glyceryl monostearate or glyceryl distearate may be employed. They may also be coated by the technique described in the U.S. Patent 4,256,108; 4,166,452; and 4,265,874 to form osmotic therapeutic tablets for control release.
Formulations for oral use may also be presented as hard gelatin capsules wherein the active ingredient is mixed with an inert solid diluent, for example, calcium carbonate, calcium phosphate or -12- WO 98/41516 PCT/CA98/00225 kaolin, or as soft gelatin capsules wherein the active ingredients is mixed with water or miscible solvents such as propylene glycol, PEGs and ethanol, or an oil medium, for example peanut oil, liquid paraffin, or olive oil.
Aqueous suspensions contain the active material in admixture with excipients suitable for the manufacture of aqueous suspensions. Such excipients are suspending agents, for example, sodium carboxymethylcellulose, methylcellulose, hydroxypropylmethycellulose, sodium alginate, polyvinyl-pyrrolidone, gum tragacanth and gum acacia; dispersing or wetting agents may be a naturally-occurring phosphatide, for example lecithin, or condensation products of an alkylene oxide with fatty acids, for example polyoxyethylene stearate, or condensation products of ethylene oxide with long chain aliphatic alcohols, for example heptadecaethyleneoxycetanol, or condensation products of ethylene oxide with partial esters derived from fatty acids and a hexitol such as polyoxyethylene sorbitol monooleate, or condensation products of ethylene oxide with partial esters derived from fatty acids and hexitol anhydrides, for example polyethylene sorbitan monooleate. The aqueous suspensions may also contain one or more preservatives, for example ethyl, or n-propyl, p-hydroxybenzoate, one or more coloring agents, one or more flavoring agents, and one or more sweetening agents, such as sucrose, saccharin or aspartame.
Oily suspensions may be formulated by suspending the active ingredient in a vegetable oil, for example, arachis oil, olive oil, sesame oil or coconut oil, or in mineral oil such as liquid paraffin. The oily suspensions may contain a thickening agent, for example, beeswax, hard paraffin or cetyl alcohol. Sweetening agents such as those set forth above, and flavoring agents may be added to provide a palatable oral preparation. These compositions may be preserved by the addition of an anti-oxidant such as ascorbic acid.
Dispersible powders and granules suitable for preparation of an aqueous suspension by the addition of water provide the active ingredient in admixture with a dispersing or wetting agent, suspending agent and one or more preservatives. Suitable dispersing or wetting agents and suspending agents are exemplified by those already -13- WO 98/41516 PCT/CA98/00225 mentioned above. Additional excipients, for example, sweetening, flavoring and coloring agents, may also be present.
The pharmaceutical compositions of the invention may also be in the form of an oil-in-water emulsions. The oily phase may be a vegetable oil, for example, olive oil or arachis oil, or a mineral oil, for example, liquid paraffin or mixtures of these. Suitable emulsifying agents may be naturally-occurring phosphatides, for example, soy bean, lecithin, and esters or partial esters derived from fatty acids and hexitol anhydrides, for example, sorbitan monooleate, and condensation products of the said partial esters with ethylene oxide, for example, polyoxy-ethylene sorbitan monooleate. The emulsions may also contain sweetening and flavouring agents.
Syrups and elixirs may be formulated with sweetening agents, for example, glycerol, propylene glycol, sorbitol or sucrose. Such formulations may also contain a demulcent, a preservative and flavoring and coloring agents. The pharmaceutical compositions may be in the form of a sterile injectable aqueous or oleagenous suspension.
This suspension may be formulated according to the known art using those suitable dispersing or wetting agents and suspending agents which have been mentioned above. The sterile injectable preparation may also be a sterile injectable solution or suspension in a non-toxic parenterally-acceptable diluent or solvent, for example, as a solution in 1,3-butane diol. Among the acceptable vehicles and solvents that may be employed are water, Ringer's solution and isotonic sodium chloride solution. Cosolvents such as ethanol, propylene glycol or polyethylene glycols may also be used. In addition, sterile, fixed oils are conventionally employed as a solvent or suspending medium. For this purpose any bland fixed oil may be employed including synthetic monoor diglycerides. In addition, fatty acids such as oleic acid find use in the preparation of injectables.
Compound I may also be administered in the form of a suppositories for rectal administration of the drug. These compositions can be prepared by mixing the drug with a suitable non-irritating excipient which is solid at ordinary temperatures but liquid at the rectal temperature and will therefore melt in the rectum to release the drug.
Such materials are cocoa butter and polyethylene glycols.
14- WO 98/41516 PCT/CA98/00225 For topical use, creams, ointments, gels, solutions or suspensions, etc., containing the compound of Formula I are employed.
(For purposes of this application, topical application shall include mouth washes and gargles.) Topical formulations may generally be comprised of a pharmaceutical carrier, cosolvent, emulsifier, penetration enhancer, preservative system, and emollient.
Dosage levels of the order of from about 0.01 mg to about 140 mg/kg of body weight per day are useful in the treatment of the aboveindicated conditions, or alternatively about 0.5 mg to about 7 g per patient per day. For example, inflammation may be effectively treated by the administration of from about 0.01 to 50 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.
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. For example, a formulation intended for the oral administration of humans may contain from 0.5 mg to 5 g 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. Dosage unit forms will generally contain between from about 1 mg to about 500 mg of an active ingredient, typically 25 mg, mg, 100 mg, 200 ng, 300 mg, 400 mg, 500 mg, 600 mg, 800 mg, or 1000 mg.
It will be understood, however, that the specific dose level for any particular patient will depend upon a variety of factors including the age, body weight, general health, sex, diet, time of administration, route of administration, rate of excretion, drug combination and the severity of the particular disease undergoing therapy.
The compounds of the present invention can be prepared according to the following methods Method A An appropriately substituted acid halide is reacted with thioanisole in a solvent such as chloroform in the presence of a Lewis acid such as aluminum chloride to afford a ketone which is then WO 98/41516 PCT/CA98/00225 hydroxylated with base such as aqueous sodium hydroxide in a solvent such as carbon tetrachloride with a phase transfer agent such as Aliquat 336. Then treatment with an oxidizing agent such as MMPP in solvents such as CH2C12/MeOH, affords a sulfone II.
R2 SMe R3 Br,CI,F 0 ,SMe
AICI
3 R32 SO2Me Aliquat 336 SMe HO R 2 MMPP 1
CCI
4 ,NaOH HO R 2 MMPP R
R
3
CH
2 C2 ,MeOH O
II
Method B An appropriately substituted alcohol is treated with a base such as sodium hydride in a solvent such as THF and then reacted with bromo acetic acid to afford an acid III.
NaH/THF ROH HO Br NT Br 0 HO
OR
0 0 Method C The acid of Method B (III) is reacted with an hydroxy ketone of Method A (II) with an esterifying reagent such as CMC in a solvent such as dichloromethane or benzotrifluoride to give an ester (IV) which is cyclized upon treatment with a base such as DBU in a solvent such as acetonitrile with or without isopropyl trifluoroacetate to afford I.
-16i.
WO 98/41516 PCT/CA98/00225 2SO 2 Me 10 3 HO <-OR CMC R O
DMAP/CH
2
CI
2
O
III
II
SO
2
R'
2 SO 2 Me 2R 3 3_2 R R 2 R
DBU,CH
3
CN
O
OR
O with or without O OR CF 3
CO
2
CH(CH
3 2
O
IV
Me Method D An appropriately substituted acid halide V is reacted with hydroxyketone II in the presence of a base such as pyridine in a solvent such as acetonitrile; further treatment with a base such as DBU gives a hydroxylactone VI. The hydroxylactone is reacted with an appropriately substituted halide in a solvent such as benzene with a reagent such as Ag2CO3 to afford the lactone I. Alternatively the hydroxylactone is reacted with an alkyl halide in a solvent such as DMF with reagents such as NaH, with or without nBu4NI to give I. In addition, the hydroxylactone can be reacted with an epoxide with a base such as Et3N to give I.
-17- WO 98/41516 WO 9841516PCT/CA98/00225 R2 SO2 Me HO NHO R 1 0 00 3 R2
SO
2 Me
R
2
DBU,CH,
O with or wit O OR CF 3
CO
2
C-
~OR CMC DMAP/0H 2 C1 2 S0 2
R'
hout 1(CH 3 2
OR
Me 18 WO 98/41516 WO 9841516PCT,'CA98/00225 Method E A bromide (Method Da) compound is reacted with a base such as potassium tert-butoxide to give the olefinic compound Ia.
S0 2
R
1
,SO
2
R'
OK/ THE 0 B r0.0
V
Method F An alcohol (Method Db or Dc) is reacted with DAST in CH2C12 to provide the fluoro compound lb.
SO
2 Me DAST/0H 2 C1 2 /rt or retlux or MsCVEI 3 N, TBAF 0 TOH S0 2
R'
0 +)rF
R
1 =Me 19
I
WO 98/41516 PCT/CA98/00225 Method G An ester (Method Da or Db) is treated with LiBH 4 to provide the alcohol Ic.
SO
2 Me S3 LiBH 4 /Et20O/CH 2 CIp 2
OH
CO2Me
O
O O~ O 0 Ic R'=Me Method H A cyclodione mono-acetal is reduced with NaBH4 and the resulting alcohol is converted to the iodide to give a mixture of the iodo acetal and iodo ketone which are separated.
0 1.NaBH 4 0 2. MsCI 0 3. LiI 0
I
WO 98/41516 PCT/CA98/00225 Method I To an olefinic compound is added diethylzinc and diiodomethane to a solvent such as 1,2-dichloroethane to give the cyclopropyl compound Id.
SO
2 Me R3 R R2 R Et 2 Zn/CH 2 1 2 0 0
SO
2
R'
o 0 Id RI=Me Method J To the hydroxy lactone VI (Method D) is added a dichloro olefinic compound and a base such as NaH in DMF. The mono chloro compound Ie is treated with n-Bu4NOAc, n-Bu4NI in CH3CN to give the allylic alcohol If. The allylic alcohol is then converted to the fluoro analog Ig by treatment with DAST in CH2C12.
-21 WO 98/41516 WO 9841516PCT/CA98/00225
CK',KCI
NaH/DMF S0 2
R
1
R
1 -Me ,S0 2
R
1 nBU 4 NOAc nBU 4
NI/CH
3
CN
DAST/0H 2 01 2 O~y
OH
,S0 2
R'
F
Ig R 1 -Me Method K To the hydroxylactone VI (Method D) and a thiaspiro compound in DMF is added NaR to give the alcohol Ih.
22 WO 98/41516 WO 9841516PCT/CA98/00225
SO
2 Me +02 *SO 2
R'
OH
Ih RI-Me Method L To alcohol Ih is added DAST to give the fluorocyclobutane, compound Ii.
S0 2
R'
SO
2 Me
DAST/CH
2
CI
2 Ii R'-Me Method M To alcohol Ih is added MsCl and Et3N in CH2C1 2 The mesylate is treated with nBu4NF to give the fluoro compound Ij.
SO
2 Me S0 2
R'
R31 .MsCI/Et 3
N/CH
2 C1 2 2
R
3 R22. nBU 4 F/THF 0 0 0 0O Ij RI=Me 23 WO 98/41516 WO 9841516PCTICA98/00225 -Method N A ketone (from Methods H and D) is treated with DAST in a solvent such as CH2C12 or benzotrifluoride to give the difluoro, compound Ik.
24 WO 98/41516 PCT/CA98/00225
SO
2 Me
DAST/CH
2
CI
2 1k R'-Me Representative Compounds Table I illustrates novel compounds of the present invention.
25 WO 98/41516 PCT/CA98/00225 Table I Example 1 Method A +B +C
SO
2 Me %F3 0
CF
3
A+B+C
A+ B +C WO 98/41516 WO 9841516PCT/CA98/00225 Table I (continued) Example Method
SO
2 Me
SSO
2 Me 0 D +E
D
D
D
+F
SO
2 Me
N-,
0 27 WO 98/41516 WO 9841516PCT/CA98/00225 Table I (continued) Example Method 11 D +F
D+G
D+G+F
D
D
0
SSO
2 Me a; 28 WO 98/41516 PCT/CA98/00225 Table I (continued)
SO
2 Me 0 Example 16 17 18 19 21 Method H+ D
H+D+N
D
D+I
J
K
0O-X-OH 29 WO 98/41516 PCT/CA98/00225 Table I (continued) e SO 2 Me Example Method S F 22
K+L
0 02Me F 23 K+M o
SO
2 Me 24 D 0 O 2 Me a 25 D+N O
FF
INHIBITION OF CYCLOOXYGENASE
ACTIVITY
Compounds are tested as inhibitors of cyclooxygenase activity in whole cell cyclooxygenase assays. These assays measure prostaglandin E2 synthesis in response to arachidonic acid, using a radioimmunoassay. Cells used for these assays are chinese hamster ovary (CHO) cell lines which have been stably transfected with an eukaryotic expression vector PCDNAIII containing either the human Cox-1 or Cox-2 CDNA's. U937 cell microsomes are also used to measure Cox-1 activity.
Whole cell assays for COX-2 and COX-1 using CHO transfected cell lines WO 98/41516 PCT/CA98/00225 Chinese hamster ovary (CHO) cell lines which have been stably transfected with an eukaryotic expression vector pCDNAIII containing either the human COX-1 or COX-2 cDNA's are used for the assay. These cell lines are referred to as CHO [hCOX-1] and CHO [hCOX-2], respectively. For cyclooxygenase assays, CHO[hCOX-1] cells from suspension cultures and CHO[hCOX-2] cells prepared by trypsinization of adherent cultures are harvested by centrifugation (300 x g, 10 min) and washed once in HBSS containing 15 mM HEPES, pH 7.4, and resuspended in HBSS, 15 mM HEPES, pH 7.4, at a cell concentration of 1.5 x 106 cells/ml. Drugs to be tested are dissolved in DMSO to 66.7-fold the highest test drug concentration. Compounds are typically tested at 8 concentrations in duplicate using serial 3-fold serial dilutions in DMSO of the highest drug concentration. Cells (0.3 x 106 cells in 200 Dl) are preincubated with 3 pl of the test drug or DMSO vehicle for 15 min at 37°C. Working solutions of peroxide-free AA (5.5 gM and 110 pM AA for the CHO [hCOX-1] and CHO [COX-2] assays, respectively) are prepared by a 10-fold dilution of a concentrated AA solution in ethanol into HBSS containing 15 mM HEPES, pH 7.4.
Assay of COX-1 Activity from U937 cell microsomes U 937 cells (ATCC CRL 1593) were cultured in 89% RPMI- 1640 (SIGMA), 10% fetal bovine serum (GIBCO), containing 50 IU/ml penicillin (Flow labs), 50 mg/ml streptomycin (FLOW LABS) and 2 g/1 NaHCO3 (SIGMA). Cells were maintained at a density of 0.1-2.0x10 6 /ml in 1 liter spinner flasks (Coring) at 37oC, 6% C02. For routine subculturing, cells were diluted in fresh medium and transferred to fresh flasks. U 937 cells are pelleted by centrifugation at 500 x g for min and washed once with phosphate-buffered saline and repelleted.
Cells are resuspended in homogenization buffer consisting of 0.1 M Tris- HC1, pH 7.4, 10 mM EDTA, 2 gg/ml leupeptin, 2 gg/ml soybean trypsin inhibitor, 2 gg/ml aprotinin and 1 mM phenyl methyl sulfonyl fluoride.
The cell suspension is sonicated 4 times for 10 sec and is centrifuged at 10,000 x g for 10 min at 40 C. The supernatant is centrifuged at 100,000 x g for 1 hr at 40 C. The 100,000 x g microsomal pellet is resuspended in -31- WO 98/41516 PCT/CA98/00225 0.1 M Tris-HC1, pH 7.4, 10 mM EDTA to approximately 7 mg protein/ml and stored at -800 C.
Microsomal preparations are thawed immediately prior to use, subjected to a brief sonication, and then diluted to a protein concentration of 125 gg/ml in 0.1 M Tris-HC1 buffer, pH 7.4 containing mM EDTA, 0.5 mM phenol, 1 mM reduced glutathione and 1 gM hematin. Assays are performed in duplicate in a final volume of 250 .1.
Initially, 5 gl of DMSO vehicle or drug in DMSO are added to 20 gl of 0.1 M Tris-HCl buffer, pH 7.4 containing 10 mM EDTA in wells of a 96deepwell polypropylene titre plate. 200 pl of the microsomal preparation are then added and pre-incubated for 15 min at room temperature before addition of 25 gl of 1 M arachidonic acid in 0.1 M Tris-HC1 and 10 mM EDTA, pH 7.4. Samples are incubated for 40 min at room temperature and the reaction is stopped by the addition of 25 gl of 1 N HC1. Samples are neutralized with 25 gl of 1 N NaOH prior to quantitation of PGE2 content by radioimmunoassay (Dupont-NEN or Amersham assay kits).
Cyclooxygenase activity is defined as the difference between PGE2 levels in samples incubated in the presence of arachidonic acid and ethanol vehicle.
HUMAN WHOLE BLOOD ASSAY Rationale Human whole blood provides a protein and cell-rich milieu appropriate for the study of biochemical efficacy of anti-inflammatory compounds such as selective COX-2 inhibitors. Studies have shown that normal human blood does not contain the COX-2 enzyme. This is consistent with the observation that COX-2 inhibitors have no effect on PGE2 production in normal blood. These inhibitors are active only after incubation of human whole blood with LPS, which induces COX-2. This assay can be used to evaluate the inhibitory effect of selective COX-2 inhibitors on PGE2 production. As well, platelets in whole blood contain a large amount of the COX-1 enzyme. Immediately following blood clotting, platelets are activated through a thrombin-mediated mechanism. This reaction results in the production of thromboxane B2 (TxB2) via activation of COX-1. Thus, the effect of test compounds on -32- WO 98/41516 PCT/CA98/00225 TxB2 levels following blood clotting can be examined and used as an index for COX-1 activity. Therefore, the degree of selectivity by the test compound can be determined by measuring the levels of PGE 2 after LPS induction (COX-2) and TxB2 following blood clotting (COX-1) in the same assay.
Method A. COX-2 (LPS-induced PGE2 production) Fresh blood is collected in heparinized tubes by venipuncture from both male and female volunteers. The subjects have no apparent inflammatory conditions and have not taken any NSAIDs for at least 7 days prior to blood collection. Plasma is immediately obtained from a 2mL blood aliquot to use as blank (basal levels of PGE2).
The remaining blood is incubated with LPS (100 gg/ml final concentration, Sigma Chem, #L-2630 from E. coli; diluted in 0.1% BSA (Phosphate buffered saline) for 5 minutes at room temperature. Five hundred gL aliquots of blood are incubated with either 2pL of vehicle (DMSO) or 2gL of a test compound at final concentrations varying from to 30pM for 24 hours at 370C. At the end of the incubation, the blood is centrifuged at 12,000 x g for 5 minutes to obtain plasma. A 100iL aliquot of plasma is mixed with 400gL of methanol for protein precipitation. The supernatant is obtained and is assayed for PGE2 using a radioimmunoassay kit (Amersham, RPA#530) after conversion of PGE2 to its methyl oximate derivative according to the manufacturer's procedure.
B. COX-1 (Clotting-induced TxB9 production) Fresh blood is collected into vacutainers containing no anticoagulants. Aliquots of 500pL are immediately transferred to siliconized microcentrifuge tubes preloaded with 2pL of either DMSO or a test compound at final concentrations varying from 10nM to The tubes are vortexed and incubated at 37 0 C for 1 hour to allow blood to clot. At the end of incubation, serum is obtained by centrifugation (12,000 x g for 5 min.). A 100pL aliquot of serum is mixed with 400pL of methanol for protein precipitation. The supernatant is obtained and is -33- WO 98/41516 PCT/CA98/00225 assayed for TxB2 using a enzyme immunoassay kit (Cayman, #519031) according to the manufacturer's instruction.
RAT PAW EDEMA ASSAY Protocol Male Sprague-Dawley rats (150-200 g) are fasted overnight and are given, po, either vehicle methocel or 5% Tween 80) or a test compound. One hr later, a line is drawn using a permanent marker at the level above the ankle in one hind paw to define the area of the paw to be monitored. The paw volume (VO) is measured using a plethysmometer (Ugo-Basile, Italy) based on the principle of water displacement. The animals are then injected subplantarly with 50 ml of 1% carrageenan solution in saline (FMC Corp, Maine) into the paw using an insulin syringe with a 25-gauge needle 500 mg carrageenan per paw). Three hr later, the paw volume (V3) is measured and the increases in paw volume (V3 VO) are calculated.
The animals are sacrificed by C02 asphyxiation and the absence or presence of stomach lesions scored. Data is compared with the vehiclecontrol values and percent inhibition calculated. All treatment groups are coded to eliminate observer bias.
NSAID-INDUCED GASTROPATHY IN RATS Rationale The major side effect of conventional NSAIDs is their ability to produce gastric lesions in man. This action is believed to be caused by inhibition of Cox-1 in the gastrointestinal tract. Rats are particularly sensitive to the actions of NSAIDs. In fact, rat models have been used commonly in the past to evaluate the gastrointestinal side effects of current conventional NSAIDs. In the present assay, NSAID-induced gastrointestinal damage is observed by measuring fecal 5 1Cr excretion after systemic injection of 51Cr-labeled red blood cells. Fecal 5 1Cr excretion is a well-established and sensitive technique to detect gastrointestinal integrity in animals and man.
-34- WO 98/41516 PCT/CA98/00225 Methods Male Sprague Dawley rats (150 200 g) are administered orally a test compound either once (acute dosing) or b.i.d. for 5 days (chronic dosing). Immediately after the administration of the last dose, the rats are injected via a tail vein with 0.5 mL of 51Cr-labeled red blood cells from a donor rat. The animals are placed individually in metabolism cages with food and water ad lib. Feces are collected for a 48 h period and 5 1Cr fecal excretion is calculated as a percent of total injected dose. 5 1Cr-labeled red blood cells are prepared using the following procedures. Ten mL of blood is collected in heparinized tubes via the vena cava from a donor rat. Plasma is removed by centrifugation and replenished with equal volume of HBSS. The red blood cells are incubated with 400 Ci of sodium 5 1 chromate for 30 min. at 37C. At the end of the incubation, the red blood cells are washed twice with 20 mL HBSS to remove free sodium 51chromate. The red blood cells are finally reconstituted in 10 mL HBSS and 0.5 mL of the solution (about 20 Ci) is injected per rat.
PROTEIN-LOSING GASTROPATHY IN SQUIRREL MONKEYS Rationale Protein-losing gastropathy (manifested as appearance of circulating cells and plasma proteins in the GI tract) is a significant and dose-limiting adverse response to standard non-steroidal antiinflammatory drugs (NSAIDs). This can be quantitatively assessed by intravenous administration of 5 1CrCl3 solution. This isotopic ion can avidly bind to cell and serum globins and cell endoplasmic reticulum.
Measurement of radioactivity appearing in feces collected for 24 h after administration of the isotope thus provides a sensitive and quantitative index of protein-losing gastropathy.
Methods Groups of male squirrel monkeys (0.8 to 1.4 kg) are treated by gavage with either 1% methocell or 5% Tween 80 in H20 vehicles, (3mL/kg or test compounds at doses from 1 100 mg/kg b.i.d. for days. Intravenous 5 1Cr (5Ci/kg in 1 ml/kg phosphate buffer saline WO 98/41516 PCT/CA98/00225 (PBS)) is administered 1 h after the last drug/vehicle dose, and feces collected for 24 h in a metabolism cage and assessed for excreted 5 1Cr by gamma-counting. Venous blood is sampled 1 h and 8 h after the last drug dose, and plasma concentrations of drug measured by RP-HPLC.
LPS-Induced Pvrexia in Conscious Rats Male Sprague-Dawley rats (150 200 g) were fasted for 16 18 h before use. At approximately 9:30 the animals were placed temporarily in plexiglass restrainers and their baseline rectal temperature was recorded using a flexible temperature probe (YSI series 400) connected to a digital thermometer (Model 08502, Cole Parmer). The same probe and thermometer were used for all animals to reduce experimental error. The animals were returned to their cages after the temperature measurements. At time zero, the rats were injected intraperitoneally with either saline or LPS (lipopoly-saccharide, 2 mg/kg, Sigma Chem) and the rectal temperature was remeasured at 6 and 7 h following LPS injection. After the measurement at 5 h, when the increase in temperature had reached a plateau, the LPS-injected rats were given either the vehicle methocel) or a test compound orally to determine whether the compound could reverse the pyrexia.
Percent reversal of the pyrexia was calculated using the rectal temperature obtained at 7 h in the control (vehicle-treated) group as the reference (zero reversal) point. Complete reversal of pyrexia to the pre- LPS baseline value is taken as 100%.
LPS-Induced Pyrexia in Conscious Squirrel Monkeys Temperature probes were surgically implanted under the abdominal skin in a group of squirrel monkeys (Saimiri sciureus) (1.0 1.7 kg). This allows for the monitoring of body temperature in conscious, unrestrained monkeys by a telemetric sensing system (Data Sciences International, Minnesota). The animals were fasted and were placed in individual cages for acclimatization 13 14 h before use. Electronic receivers were installed on the side of the cages which pick up signals from the implanted temperature probes. At approximately 9:00 a.m. on the day of the experiment, the monkeys were restrained temporarily in training chairs and were given a bolus I.V. injection of LPS, (6 mg/kg, 36- WO 98/41516 PCT/CA98/00225 dissolved in sterile saline). The animals were returned to their cages and body temperature was recorded continuously every 5 min. Two h after injection of LPS, when the body temperature had increased by 1.5 2oC, the monkeys were dosed orally with either vehicle methocel) or a test compound (3 mg/kg). One hundred minutes later, the difference between the body temperature and the baseline value was determined.
Percent inhibition was calculated taking the value in the control group as 0% inhibition.
Acute Inflammatory Hyperalgesia Induced by Carrageenan in Rats Experiments were performed using male Sprague Dawley rats 9 0-110g). Hyperalgesia to mechanical compression of the hind paw was induced by intraplantar injection of carrageenan (4.5 mg into one hind paw) 3 h previously. Control animals received an equivalent volume of saline (0.15 ml intraplantar). A test compound (0.3-30 mg/kg, suspended in 0.5% methocel in distilled water) or vehicle methocel) was administered orally (2ml/kg) 2 h after carrageenan. The vocalisation response to compression of the hind paw was measured 1 h later using a Ugo Basile algesiometer.
Statistical analysis for carrageenan-induced hyperalgesia was performed using one-way ANOVA (BMDP Statistical Software Inc.). Hyperalgesia was determined by subtracting the vocalisation threshold in saline injected rats from that obtained in animals injected with carrageenan. Hyperalgesia scores for drug-treated rats were expressed as a percentage of this response. ID50 values (the dose producing 50% of the maximum observed response) were then calculated by nonlinear least squares regression analysis of mean data using GraFit (Erithacus Software).
Adjuvant-Induced Arthritis in Rats Seventy, 6.5-7.5 week old, female Lewis rats (body weight -146-170 g) were weighed, ear marked, and assigned to groups (a negative control group in which arthritis was not induced, a vehicle control group, a positive control group administered indomethacin at a total daily dose of 1 mg/kg and four groups administered with a test compound at total daily doses of 0.10-3.0 mg/kg) such that the body weights were equivalent within each group. Six groups of 10 rats each 37- WO 98/41516 PCT/CA98/00225 were injected into a hind paw with 0.5 mg of Mycobacterium butyricum in 0.1 ml of light mineral oil (adjuvant), and a negative control group of rats was not injected with adjuvant. Body weights, contralateral paw volumes (determined by mercury displacement plethysmography) and lateral radiographs (obtained under Ketamine and Xylazine anesthesia) were determined before (day and 21 days following adjuvant injection, and primary paw volumes were determined before (day and on days 4 and 21 following adjuvant injection. The rats were anesthetized with an intramuscular injection of 0.03 0.1 ml of a combination of Ketamine (87 mg/kg) and Xylazine (13 mg/kg) for radiographs and injection of adjuvant. The radiographs were made of both hind paws on day 0 and day 21 using the Faxitron (45 kVp, 30 seconds) and Kodak X-OMAT TL film, and were developed in an automatic processor. Radiographs were evaluated for changes in the soft and hard tissues by an investigator who was blinded to experimental treatment. The following radiographic changes were graded numerically according to severity: increased soft issue volume narrowing or widening of joint spaces subchondral erosion periosteal reaction osteolysis (0-4) subluxation and degenerative joint changes Specific criteria were used to establish the numerical grade of severity for each radiographic change. The maximum possible score per foot was 26. A test compound at total daily doses of 0.1, 0.3, 1, and 3 mg/kg/day, Indomethacin at a total daily dose of 1 mg/kg/day, or vehicle methocel in sterile water) were administered per os b.i.d. beginning post injection of adjuvant and continuing for 21 days. The compounds were prepared weekly, refrigerated in the dark until used, and vortex mixed immediately prior to administration.
Two-factor ('treatment' and 'time') analysis of variance with repeated measures on 'time' were applied to the changes for body weight and foot volumes and to the rank-transformed radiographic total scores. A post hoc Dunnett's test was conducted to compare the effect of treatments to vehicle. A one-way analysis of variance was applied to the thymic and spleen weights followed by the Dunnett's test to compare the effect of treatments to vehicle. Dose-response curves for inhibition in foot volumes on days 4, 14 and 21 were fitted by a 4-parameter logistic function using a nonlinear least squares' regression. ID50 was defined -38- WO 98/41516 PCT/CA98/00225 as the dose corresponding to a 50% reduction from the vehicle and was derived by interpolation from the fitted 4-parameter equation.
Representative Biological Data Compounds of the present invention are inhibitors of cyclooxygenase-2 and are thereby useful in the treatment of cyclooxygenase-2 mediated diseases as enumerated above. The activities of the compounds against cyclooxygenase may be seen in the representative results shown below. In the assay, inhibition is determined by measuring the amount of prostaglandin E2 (PGE2) synthesized in the presence of arachidonic acid, cyclooxygenase-1 or cyclooxygenase-2 and a putative inhibitor. The IC50 values represent the concentration of putative inhibitor required to return PGE2 synthesis to 50% of that obtained as compared to the uninhibited control.
The results for certain of the biological assays may be seen in Tables II and III.
Table II Example 2 3 8 11 17 23 Rat Paw Edema 2.4 3.1 3.2 2.3 0.9 5.9 -39- WO 98/41516 WO 9841516PCT/CA98/00225 Table Mn (1C50) COX-l (1C50) Exampi CHO HWB U937 CHO HWB e uM uM uM uM 1 0.05 1.9 2 0.04 <0.4 3 0.1 <0.4 4 0.6 0.9 0.08 0.6 6 0.01 0.08 7 0.07 8 0.5 9 10.4 0.05 0.14 11 0.09 0.08 12 0.5 4.7 13 0.1 0.6_ 14 0.5 5.1 0.2 1.8 16 0.4 17 0.3 0.6 18 <0.4 19 <0.4 0.2 0.6 21 0.6 0.9 220.1 230.1 <0.4 24 0.4 <0.4 The invention will now be illustrated by the following nonlimiting examples in which, unless stated otherwise: WO 98/41516 PCT/CA98/00225 all operations were carried out at room or ambient temperature, that is, at a temperature in the range 18-25 0
C;
(ii) evaporation of solvent was carried out using a rotary evaporator under reduced pressure (600-4000 pascals: 4.5-30 mm Hg) with a bath temperature of up to 60 0
C;
(iii) the course of reactions was followed by thin layer chromatography (TLC) and reaction times are given for illustration only; (iv) melting points are uncorrected and indicates decomposition; the melting points given are those obtained for the materials prepared as described; polymorphism may result in isolation of materials with different melting points in some preparations; the structure and purity of all final products were assured by at least one of the following techniques: TLC, mass spectrometry, nuclear magnetic resonance
(NMR)
spectrometry or microanalytical data; (vi) yields are given for illustration only; (vii) when given, 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 or 400 MHz using the indicated solvent; conventional abbreviations used for signal shape are: s. singlet; d. doublet; t. triplet; m. multiplet; br. broad; etc.: in addition "Ar" signifies an aromatic signal; (viii) chemical symbols have their usual meanings; the following abbreviations have also been used v (volume), w (weight), b.p. (boiling point), M.P. (melting point), L (liter(s)), mL (milliliters), g (gram(s)), mg (milligrams(s)), mol (moles), mmol (millimoles), eq (equivalent(s)).
EXAMPLE 1 5,5-Dimethyl-3-((l-methylallyl)oxy)-4-(4-methylsulfonylphenyl)-5H-furan- 2-one -41 WO 98/41516 PCT/CA98/00225 Step 1: 2-Methyl-l-( 4 -(methvlthio)phenyl)-propan-1-one To a suspension of aluminum chloride (136 g, 1.02 mol) in chloroform (1.0 L) cooled to -10 OC, was added dropwise isobutyrylchloride (115 mL, 1.10 mol). Then thioanisole (100 mL, 0.85 mol) was added dropwise. Upon completion of addition the reaction was allowed to proceed at r.t. for 1.5h. The reaction was cooled to 10 °C and quenched by addition of water (750 mL). The organic layer was separated, washed with water (2 x 500 mL), saturated NaHCO 3 solution(2 x 500 mL), brine (1 x 500 mL), and then dried over Na2SO4.
After concentration in vacuo., the resulting crude product crystallized upon standing under high vacuum for 30 min to give the title compound as a brown solid.
Ste 2: 2 -Hvdroxv-2-methvl-l-(4-(methylthio)phenyl)propan-l-one To a solution of 2 -methyl-l-(4-(methylthio)phenyl)propan-lone (28.5 g, 147 mmol, Step Aliquat 336 (11.0 mL, 24 mmol) and carbon tetrachloride (21 mL, 218 mmol) in toluene (43 mL) was added sodium hydroxide (12.9 g, pellets, 322 mmol). The reaction was stirred at 15 °C for 2h and then at r.t. for 16h. The reaction was diluted with water (100 mL), brine (100 mL) and EtOAc (300 mL). The aqueous phase was acidified with 1 N HC1 and extracted with EtOAc (100 mL). The combined organic layers were dried over Na2SO4 and concentrated. The crude product was purified by silica gel chromatography eluted with EtOAc in hexane to give the title compound as a thick syrup.
Ste 3: 2-Hydroxy-2-methyl-l-( 4 -(methylsulfonyl)phenyl)propan- 1one To a cold (4 solution of 2-hydroxy-2-methyl-l-(4- (methylthio)phenyl)propan-l-one (45.0 g, 214 mmol, Step 2) in t-butanol (500 mL) and CH2C12 (500 mL) was added a solution of OXONETM (194 g, 316 mmol) in water (1.4 The resulting suspension was stirred at r.t.
for 18h. The reaction was diluted with EtOAc (400 mL) and the layers were separated. The aqueous layer was extracted with EtOAc (2 x 250 mL). The combined organic layers were dried over Na2SO4 and concentrated in vacuo. The crude product was dissolved in diethyl ether (250 mL), hexane was added (150 mL) and the product was swished for -42- WO 98/41516 PCT/CA98/00225 2h. The product was collected by filtration to give the title compound as a yellow solid.
Ste4A: (1-Methvlallyloxy) acetic acid To a solution of 1-buten-3-ol (25 mL, 288 mmol) in THF (250 mL) at O0C was added NaH (8.6 g, 288 mmol, 80% in oil). After the NaH had been consumed, bromoacetic acid (10 g, 71.9 mmol) was added. The reaction was then allowed to stir at r.t. overnight. The mixture was then cooled to OoC, and ice was added followed by cold 6 M HC1 (75 mL). The product was extracted with EtOAc and the organic layer was washed with H20 and brine. After drying (MgSO4), filtration, and removal of the solvent, beige coloured oil (10.5 g) was obtained. This was used without further purification.
Ste 5: (l-Methylallyloxy)acetic acid 2-methyl-1-(4methvlsulfonvlDhenvl)propan-l-one-2vl ester To a solution of the alcohol of Step 3 (2.87 g, 11.8 mmol) and the acid from step 1 (2.0 g, 15.4 mmol) in CH2C12 (30 mL) was added CMC (7.5 g, 17.7 mmol), along with 50 mg of DMAP. After stirring overnight, H20 (20 mL) was added and the product was extracted with CH2C1 2 The organic layer was dried (MgSO4), filtered and evaporated.
Purification was effected by flash chromatography (1:5 EtOAc:hexane) to yield 2.97 g of an oil.
Ste 6: 5,5-Dimethyl-3-(l-methylallyl)oxy)-4-(4-methylsulfonyl) phenvl)-5H-furan-2-one To a solution of the ester from Step 5, (2.97 g, 8.3 mmol) in CH3CN (30 mL) was added DBU (1.87 mL, 12.6 mmol) and isopropyl trifluoroacetate (1.53 mL, 10.9 mmol). The mixture was stirred at for 20 h. H20 (60 mL) was then added, followed by 6M HC1 until the dark colour faded. The product was extracted with EtOAc and the organic layer was washed with H20 and brine. After drying (MgSO4) and filtration through a plug of silica gel, the solvent was removed to give a pale brown residue. Purification was effected by flash chromatography (1:5 EtOAc: hexane) to give an off white solid. This was recrystallized from EtOAc:hexane to give a white solid (228 mg).
-43- WO 98/41516 WO 9841516PCT/CA98/00225 IHNMR d 1.34 1.39 (3H, mn), 1.65 (6H, 3.18 (3H1, 5.11 5.17 (1H, in), 5.17 5.25 (1H, in), 5.43 5.53 (11, mn), 5.77 5.89 (1H, in), 7.98 8.08 (4H, Mn).
EXAMPLE 2 5,5-Dimethyl-3-( 1,1, l, 3 3 3 -hexafluoropropoxy)-4-(4-methylsulfonyl.
phenyl)-5H-furan-2-one af 1.1.1.3.3 3 -Hexafluoropropoxvacetic acid The title compound was prepared as described in Example 1 Step 4 using 1,1,1,3 3 3 -hexafluoro-2-propanol.
Step 2 2-methyl- l-( 4 -methvlthiophenl)propan-. -one-2v1 ester The title compound was prepared as described in Example 1 Step 5, using the tertiary alcohol of Example 1 Step 2.
Step 3 5,5-Dimethyl-3-( 1,1, l, 3 3 3 -hexafluoropropoxy)-4-(4inethylthiophenl)-5H-furan.2.ne The title compound was prepared using conditions described in Example 1 Step 6 except that isopropyltrifluoroacetate was not added to the reaction mixture.
StW 45,5-Dimethyl-3-( 1,1,1 3 3 3 -hexafluoropropoxy)-4-(4methlsulfonlphenl5Hfuran.2one The title compound was prepared using conditions described in Example 1 Step 3, except that MeGH was used instead of tbutanol.
1H1 NMR (CD3COCD3) d 1.70 (6H1, 3.20 (3H1, 6.47 (1H, mn), 8.00 (4H1, dd).
EXAMPLE 3 ,5-Dimethyl-3-(( l-methyl-2-propynyl)oxy).4.(4-miethylsulfonylphenyl).
5H-furan-2-one Step 1 (1-meth 1- 2 ropnl,)ct ai -44- WO 98/41516 PCT/CA98/00225 The title compound was prepared as described in Example 1 Step 4 except the reaction mixture was refluxed overnight.
Step 2 (l-methyl-2-propynyloxy)acetic acid 2-methyl-1-(4methylsulfonylphenvl)propan- 1-one-2yl ester The title compound was prepared as described in Example 1 Step Step 3 5,5-Dimethyl-3-((1-methyl-2-propynyl)oxy)-4-(4methvlsulfonvlphenvl)-5H-furan-2-one The title compound was prepared using conditions described in Example 1 Step 6 except that the reaction was performed with 4 equivalents of DBU and without isopropyl trifluoroacetate.
1H NMR (CD3COCD3) d 1.55 (3H, 1.70 (6H, 2s), 3.20 (3H, 5.80 (1H, 8.00 (4H, m).
EXAMPLE 4 2S)-(1S, 2
R)-
2 -hydroxy-l-methylpropyl)oxy)-5,5-dimethyl-4-(4methvlsulfonvlphenvl)-5H-furan-2-one Step1 5,5-Dimethyl-3-hydroxy-4-(4-methylsulfonylphenyl)-5Hfuran-2-one To a OOC solution of the alcohol of Example 1, Step 3 (29.5 g, 122 mmol) in CH3CN (350 mL) were added pyridine (25 mL) and acetoxyacetyl chloride (25 g, 183 mmol). After a period of 7h at DBU (31 mL) was added to the reaction mixture. After a period of lh at 800C, a second portion of DBU (35 mL) was added. The reaction mixture was kept at 80oC for 18h. The reaction mixture was allowed to cool to r.t. The mixture was poured onto ice-water (2.5L) containing 100 mL of concentrated HC1. The brown solid was collected and dissolved in hot acetonitrile and was filtered through a plug of silica. The solvent was evaporated and the resultant solid was swished in EtOAc to give the title compound (21.2g, 62%).
WO 98/41516 PCT/CA98/00225 Step 2 2S)-(1S, 2R)-2-hydroxy-l-methylpropyl)oxy)-5,5dimethvl-4-(4-methvlsulfonvlphenyl)-5H-furan-2-one A sealed tube was charged with the hydroxy lactone of Step 1 (300 mg, 1.06 mmol) in 1.06 mL EtOH, trans-2,3-epoxybutane (307 mg, 4.25 mmol) and Et3N (430 mg, 4.25 mmol). The mixture was heated at reflux for 48 h. After cooling the mixture was poured into 5% aq HC1 mL) and extracted with EtOAc (3x 20 mL). The combined organic layers were washed with brine (Ix 30 mL) and dried over MgSO4. Flash chromatography (40% EtOAc in toluene) gave 34 mg of product; mp. 121 122-C, MS m/z 355 (M+H) EXAMPLE 3-((2-hydroxy-2-methyl-3-butenyl)oxy)-5,5-dimethyl-4-(4-methylsulfonvl)phenvl-5H-furan-2-one To a solution of the hydroxy lactone of Example 4 Step 1, (500 mg, 1.77 mmol) in 1.4 ml EtOH was added Et3N (717 mg, 7.08 mmol) and 2 -methyl-2-vinyloxirane (596 mg, 7.08 mmol). The mixture was stirred at 50oC; for 16 h the solvent was evaporated and the residue was chromatographed on silica gel (40% EtOAc in toluene). The product was further purified by stirring in Et20/hexane. The product was filtered to give 20 mg of an off white solid. MS m/z 367 (M+H) EXAMPLE 6 3-(2-Bromo- -methylethoxy)-5,5-dimethyl-4-(4-methylsulfonylphenyl)-5Hfuran-2-one To a suspension of the alcohol of Example 4 Step 1, (1.00 g, 3.59 mmol) in benzene (40.0 mL) were added an excess of 1,2-dibromo propane (0.50 mL) and Ag2CO3 (3.00 g, 10.8 mmol). After a period of 18 h at 60ooC, the reaction mixture was filtered over celite and washed with CH2C12. After evaporation, the crude product was purified by flash chromatography to provide 162 mg of the title compound after crystallization with 1H NMR (CD3COCD3) d 1.40 (3H, 1.65 (6H, 2s), 3.20 (3H, 3.70 (2H, 5.40 (1H, 8.05 (4H, m).
EXAMPLE 7 46- WO 98/41516 PCT/CA98/00225 3-(Isopropenyloxy)-5,5-dimethyl-4-(4-methylsulfonylphenyl)-5H-furan-2one To the bromide of Example 6 (300 mg, 0.746 mmol) in THF (10 mL) was added 1.5 mL of a 1M THF solution of potassium tertbutoxide. The resulting mixture was stirred at room temperature for 1 h. The reaction mixture was then partitioned between 25% NH40Ac and EtOAc. The organic phase was dried over Na 2
SO
4 filtered and evaporated. After flash chromatography, 100 mg of the title compound was obtained.
1H NMR (CD3COCD 3 d 1.70 (6H, 1.90 (3H, 3.20 (3H, 4.10 and 4.20 (2H, 8.00 (4H, m).
EXAMPLE 8 3-(((2S)-3-hydroxy-2-methylpropyl)oxy)-5,5-dimethyl-4(4-methylsulfonylphenvl)-5H-furan-2-one Step 1 (2S)-1-Bromo-3-t-butvldiphenvlsilloxy)-2-methylpropane To a solution of 3 -bromo-2-methyl-l-propanol (780 mg, 5.16 mmol) in CH2C12 (13 mL) were added Et3N (1.07 mL, 7.69 mmol), tert-butylchlorodiphenylsilane (1.70 g, 6.18 mmol) and DMAP mg). After a period of 3 h at room temperature, 25% aqueous was added and the organic phase was separated, dried over Na2SO4 and evaporated. The title compound was purified by flash chromatography to provide 1.8 g of an oil.
Ste2 3-(((2R)-3-t-butyldiphenylsilyloxy)-2-methylpropyl)oxy) dimethvl-4-(4-methvlsulfonylphenvl)-5H-furan-2-one To the alcohol of Example 4 Step 1 (629 mg, 2.23 mmol) in DMF (6.3 mL) were added the bromide of Step 1 (1.30 g, 3.34 mmol), nBu 4 NI (822 mg, 2.23 mmol) and NaH 60% in oil (126 mg, 3.15 mmol).
After a period of 5 h at 70-C, the reaction mixture was partitioned between 25% NH 4 0Ac and EtOAc. The organic phase was separated, dried over Na 2
SO
4 filtered and evaporated under reduced pressure.
The title compound was purified by flash chromatography to give 1.5 g of material.
-47- WO 98/41516 PCT/CA98/00225 Ste 3 3 2
S)-
3 -hydroxy-2-methylpropyl)oxy)-5,5-dimethyl- 4 4 methylsulfonvlphenvl)-5H-furan-2-one To the silyl ether of Step 2 (1.6 g, 2.70 mmol) in THF (14 mL) was added a 1M THF solution of tetrabutylammonium fluoride (4.05 mL, 4.05 mmol). After a period of 1.5 h at room temperature, the reaction was partitioned between 25% aqueous NH40Ac and EtOAc. The organic phase was separated, dried over Na2SO 4 filtered and evaporated. The title compound (800 mg) was obtained after purification by flash chromatography.
1H NMR (CD3COCD 3 d 0.90 (3H, 1.60 (6H, 1.90 (1H, 3.20 (3H, 3.50 (2H, 3.60 (1H, 4.20 and 4.40 (2H, 8.00 (4H, m).
EXAMPLE 9 3 2 R)-3-hydroxy-2-methylpropyl)oxy)-5,5-dimethyl-4-(4methylsulfonvlphenvl)-5H-furan-2-one To the alcohol of Example 4, Step 1 (3.00 g, 10.6 mmol) in DMF (35 mL) were added (R)-(-)-3-bromo-2-methyl-l-propanol (3.00 g, 19.6 mmol), nBu4NI (3.00 g, 8.10 mmol) and NaH 80% in oil (0.91 g, mmol). After a period of 5h at 70ooC, the reaction mixture was partitioned between 25% NH40Ac and EtOAc. The organic phase was separated, dried over Na2SO4, filtered and evaporated. The title compound (390 mg) was purified by flash chromatography.
1H NMR (CD3COCD 3 d 0.90 (3H, 1.60 (6H, 1.90 (1H, 3.20 (3H, 3.50 (2H, 3.60 (1H, 4.20 and 4.40 (2H, 8.00 (4H, m).
EXAMPLE 3-(((2R)-3-Fluoro-2-methylpropyl)oxy)-5,5-dimethyl-4-(4methylsulfonvlphenyl)-5H-furan-2-one To the alcohol of Example 8 Step 3 (800 mg, 2.25 mmol) in CH2C12 (10 mL) at -20ooC were added Et3N (943 mL, 6.05 mmol) and MsCl (348 mL, 4.51 mmol). After a period of 1 h at OoC, saturated NaHCO3 was added. The organic phase was separated, dried over Na2SO4, filtered and evaporated. To the crude mesylate in THF (10.0 mL) was added a 1M THF solution of tetrabutylammonium fluoride (6.77 -48- WO 98/41516 PCT/CA98/00225 mL, 6.77 inmol). After a period of 2 h at 50ooC, the reaction Mixture was partitioned between 25% NH4OAc and EtOAc. The organic phase was separated, dried over Na2SO4, filtered and evaporated. The title compound (370 mg) was purified by flash chromatography.
1H NMR (CD3COCD 3 d 0.90 (311,d), 1.60 (6H, 2.20 (1H, in), 3.20 (3H, 4.20 to 4.50 (4H, mn), 8.00 (4H, in).
EXAMPLJ
3 -fluoro-2-methylpropyl)oxy)-.5 ,5-dimethyl-4-(4methylsulfgal henl).SHfuran.2.one The title compound was prepared from the alcohol of Example 9 as described in Example 1H NMR(CD3COCD 3 d 0.90 (3H, 1.60 (6H, 2.20 (1H, in), 3.20 (3H, 4.20 to 4.50 (4H, mn), 8.00 (4H, in).
EXAMPLE 12 3-(2-Hydroxy- 1-methylethoxy)-s ,5-dimethyl-4-(4-methylsulfonyl..phenvl 5H-furan-2-one Step 1: Methyl 2 -((5,S-dimethyl-4-(4-methylsulfonylphenyl).2oxo- 2 .5-dihydro-3-furanyloxv)propanoate The title compound was prepared as described in Example 8 except the reaction was performed at room temperature.
Step 2 3-2Hdoylmtyehx)55dmty--4 methylsulfo LvlphenyD)..H.furan.2one To the ester of Step 1 13 g, 3.07 minol) in CH2CI2 (30 mL) and Et2O 50 mL was added at OcoC LiBH4 (80 ing, 3.68 iniol). The reaction mixture was stirred at room temperature until completion.
The reaction mixture was partitioned between 25% NH4OAc: and EtOAc.
The organic phase was separated, dried over Na2SO4 and evaporated.
The title compound (275 mg) was obtained as a white solid after purification by flash chromatography.
49 WO 98/41516 WO 9841516PCT/CA98/00225 1H NMR (CD3COCD3) d 1.20 (3H, 1.80 and 1.65 (6H, 2s), 3.20 (3H, s), 3.60 (2H, mn), 3.95 (1H, 5.10 (1H, in), 8.00 (4H, in).
EXAMPLE 13 3-(2-Fluoro- 1-methylethoxy)-5 ,5-diinethy1-4-(4-methylsulfonylphenyl)-5H furan-2-one To the alcohol of Example 12 Step 2 (300 mng, 0.882 mmol) in CH2Cl2 (10 mL) at OcoC was added DAST (142 mL, 1.05 mmol). After a period of 18 h at room temperature and 2 days at reflux, the reaction mixture was partitioned between 25% aqueous NH4OAc and EtOAc. The organic phase was separated, dried over Na2SO4, filtered and evaporated under reduced pressure. The title compound (48 mg) was purified by flash chromatography.
1H NiVR (CD3COCD 3 d 1.30 (3H, 1.70 (6H, 2s), 4.30 4.70 (2H, mn), 5.35 (1H, mn), 8.00 (4H, in).
EXAMPLE 14 5,-iehl4(-ehlufnlhey)-2poyyoy-Hfrn2 one The title compound was prepared as described in Example 8, Step 2.
lH NMR(CD3COCD 3 d 1.60 (6H, 3.15 (1H, in), 3.20 (3H, 5.00 (2H, mi), 8.00 (4H, mn).
EXAMPLE -dimethyL-- 4 -(14-inethylsulfonvphenyl)5Hfuran-2 one The title compound was prepared as described in Example 8, Step 2.
1H NMR (CD3COCD3) d 1.60 (611, 3.20 (3H, 4.80 (2H, in), 5.30 (2H1, mn), 6.00 (1H1, mn), 8.00 (411, i).
EXAMPLE 16 50 WO 98/41516 PCT/CA98/00225 3-(1,4-dioxaspiro[4.5]dec-8-yloxy)-5,5-dimethyl-4-(4-methylsulfonylphenyl)-5H-furan-2-one Step 1: l, 4 -dioxaspiro 4.51decan-8-ol To an ice cold solution of 1, 4 -cyclohexadione mono-ethylene ketal (10.1 g, 65 mmol) in ethanol (180 mL) was added sodium borohydride (1.23 g, 32 mmol) and the resulting suspension was stirred at room temperature for l~h. The reaction was diluted with aqueous solution and extract with EtOAc. The organic layer was dried over MgSO4 and concentrated. Purification by silica gel chromatography (70% EtOAc/Hexane) provided 9.73 g of the title compound as a colorless oil.
Step 2: 1.4-dioxaspiro[4.5 dec-8-vl methanesulfonate To an ice cold solution of the alcohol from Step 1 (4.59 g, 29 mmol) and triethylamine (8.0 mL, 57 mmol) in dichloromethane (100 mL) was added methanesulfonyl chloride (3.3 mL, 43 mmol). The reaction was then diluted with water (80 mL) and extracted with CH2C12 (2x 50 mL). The combined organic layers were dried over MgSO4 and concentrated to give the title compound as a yellow oil.
Step 3: 8-Iodo-1,4-dioxaspiro[4.51decane and 4 -Iodocclohexanone To a solution of mesylate from Step 2 (7.38 g) in acetone (100 mL) was added lithium iodide (20.2 g, 151 mmol). The resulting suspension was heated at 70oC for 1 hour. The reaction was allowed to cool to room temperature, it was diluted with EtOAc (200 mL) and washed with water (2x70 mL). The organic layer was dried over MgSO 4 and concentrated. Separation of the 2 title compounds was achieved by silica gel chromatography (25 and 35% 1H NMR of 4 -Iodocyclohexane
(CD
3
COCD
3 d 2.30 (4H, 2.41 (4H, m), 4.86 (1H, m).
Ste 4: 3-(1,4-dioxaspiro[4.5]dec-8yloxy)-5,5-dimethyl-4-(4methvlsulfnvylphenvl)-5H-furan-2-one Following the procedure described for Example 6 the title compound was prepared from 8 -Iodo-l,4-dioxaspiro[4.5] decane (Step 3).
-51 WO 98/41516 PCT/CA98/00225 M.P. 133-134-oC.
1H NMR (CD 3
COCD
3 d 1.47 (2H, in), 1.67 (2H, m and 6H1, 1.78 (2H, in), 1.96 (2H, in), 3.17 (3H, 3.87 (4H1, 4.98 (1H, in), 7.99 (2H, 8.06 (2H, d).
WO 98/41516 PCT/CA98/00225 EXAMPLE 17 3-[(4,4-difluorocyclohexyl)oxy]-5,5-dimethyl-4(4-(methylsulfonyl-phenvl) 5H-furan-2-one Step 5,5-dimethyl-4- 4 -(methylsulfonyl)phenyl]-3-[(4oxocyclohexyl)oxy -5-H-furan-2 Following the procedure described for example 6 the title compound was prepared from 4 -iodocyclohexanone (Example 16, Step 3).
Step 2 To an ice cold solution of the ketone from step 1 (419 mg, 1.1 mmol) in CH2C12 (0.5 mL) was added diethylaminosulfur trifluoride and the resulting mixture was heated at 60ooC for 2 hours. The reaction was allowed to cool to room temperature and then carefully diluted with aqueous NaHCO3 saturated. The mixture was extracted with EtOAc.
The organic layer was dried over MgSO4 and concentrated. Purification by silica gel chromatography (40% EtOAc/Hexane) followed by crystalization in EtOAc/Hexane 30 mL) provided the title compound as a white solid.
M.P. 147-148C 1H NMR (CD3COCD 3 d 1.68 (6H, 1.80 1.97 (8H, 3.17 (3H, 5.04 (1H, bd), 7.98 (2H, 8.07 (2H, d).
EXAMPLE 18 5,5-dimethyl-3-(2-methylallyloxy)-4-(4-methylsulfonylphenyl)-5H-furan-2one To a solution of 3.6 g of the hydroxy lactone of Example 4 Step 1 in 50 mL DMF was added 2.5 mL of methylallyl bromide followed by 0.5 g of NaH (80% in mineral oil). The mixture was stirred for 6h at room temperature and then quenched with 50 mL of saturated solution of NH4C1. The product was extracted with 2:1 EtOAc/hexane (200 mL) and the extract was dried over MgSO 4 After filtration and concentration, the residue was purified by flash chromatography eluted with 2:1 hexane/EtOAc to give 3.7 g of the title compound as a white solid.
-53- WO 98/41516 PCT/CA98/00225 1H NMR (CD3COCD 3 d 1.64 (6H, 1.67 (3H, 3.17 (3H, 4.74 (2H, s), 4.92 (1H, 4.96 (1H, 7.96 (2H, 8.06 (2H, d).
EXAMPLE 19 5,5-Dimethyl-3-[( -methylcyclopropyl)methoxy]- 4 4 -methylsulfonylphenvl)-5H-furan-2-one To a solution of Et2Zn (0.82 mL) in 50 mL of CICH2CH 2 Cl cooled at 0oC was added 1.3 mL of CH212 slowly. The mixture was stirred for 5 min. and treated with 0.63 g of the olefin of example 18 at ooC. The mixture was stirred for 20 min. at 0ooC and 3h at room temperature. The reaction was quenched by addition of 50 mL of saturated NH4C1 solution and the product was extracted with EtOAc (200 mL) The extract was dried over MgSO4, filtered and concentrated. The crude product was purified by flash chromotography eluted with 3:2 hexane/EtOAc to give 400 mg of the title product as a white solid.
1H NMR (CD3COCD3) d 0.35 (2H, 0.49 (2H, 1.10 (3H, 1.65 (6H, 3.15 (3H, 4.13 (2H, 8.05 (4H, m).
EXAMPLE 3-{[2-(fluoromethyl)allyl]oxy)-5,5-dimethyl-4-(4-methylsulfonyl-phenvl)- 5H-furan-2-one Step 2 -(chloromethyl)allyl]oxy)-5,5-dimethyl-4-(4methvlsulfonvlphenyl)-5H-furan-2-one To a solution of 1.2 g of the hydroxy lactone of Example 4 Step 1 in 20 mL of DMF was added 0.24 g of NaH (60% in mineral oil) followed by 4 mL of 3 -chloro-2-chloromethyl-l-propene. The mixture was stirred for 14h at room temperature and then quenched with 50 mL of saturated solution of NH4C1. The mixture was extracted with 100 mL of 1:1 hexane/EtOAc and the extract was dried over MgSO4. After filtration and concentration the crude product was purified by flash chromatography eluted with 1:1 hexane/EtOAc to give 1 g of the title compound as a thick oil.
-54- WO 98/41516 PCT/CA98/00225 Step 2 [2-(hydroxymethyl)allyl] oxy}-5,5-dimethyl-4-(4methylsulfonvlphenyll-5H-furan-2-one A solution of the product of Step 1 (1.0 g) 3g of Bu4NOAc and mg of Bu4NI in 25 mL of CH3CN was stirred for 4 h at room temperature. The solvent was then removed by evaporation and the residue was partitioned between 40 mL brine and 100 mL EtOAc. The EtOAc layer was concentrated and the residue was dissolved in 40 mL of 1:1 THF/H20 and treated with 10 mL of 1N LiOH. After stirring for min. at room temperature, the mixture was treated with 1 mL AcOH and then partioned between 50 mL brine and 100 mL EtOAc. The organic layer was dried over MgSO4 and concentrated to give the crude title compound as an oil which was used for the next step without further purification.
Step 3 2 -(fluoromethyl)allyl]oxy)-5,5-dimethyl-4-(4methvlsulfonvlphenyl)-5H-furan-2-one To a solution of the crude product of Step 2 in 20 mL of CH2C12 was added 3 mL of diethylaminosulfur trifluoride. The mixture was heated to reflux for 30 min. and then poured into 50 mL of saturated solution of NaHCO3. The product was extracted with 100 mL of 1:1 EtOAc/hexane. The extract was dried over MgSO4, filtered and concentrated. The residue was purified by flash chromatography eluted with 4:1 toluene/EtOAc to give 0.6 g of the title compound as a white solid.
1H NMR(CD3COCD 3 d 1.65 (6H, 3.17 (3H, 4.87 (2H, 4.91 (2H, s), 5.34 (1H, 5.36 (1H, bs), 7.93 (2H, 8.06 (2H, d).
EXAMPLE 21 3-{[1-(hydroxymethyl)cyclopropyl]methoxy}-5,5-dimethyl-4-(4methvlsulfonvlphenvl)-2-5H-furan-2-one To a solution of 5 g of the hydroxy lactone of Example 4 Step 1 in 100 mL of DMF was added 1 g of NaH (60% in mineral oil), followed by 3 g of 5,7-dioxa-61 6 -thiaspiro[2.5]octane-6,6-dioxide. The mixture was stirred for 16 h at room temperature and then treated with 2 mL MeOH and 1 mL of AcOH. The solvent was removed under reduced pressure WO 98/41516 PCT/CA98/00225 and the residue was dissolved in 150 mL of 1,4-dioxane. The solution was treated with 1.5 mL concentrated H2S0 4 After stirring for 15 h at room temperature, 5 mL Et3N was added and the mixture was concentrated. The residue was purified by flash chromatography eluted with 2:3 toluene/EtOAc to give 2.9 g of the title compound as a white solid.
1H NMR(CD3COCD 3 d 0.51 (4H, bs), 1.66 (6H, 3.17 (3H, 3.44 (2H, 3.65 (1H, 4.29 (2H, 8.04 (4H, s).
EXAMPLE 22 3-[(l-fluorocyclobutyl)methoxy]-5,5-dimethyl-4-(4-methvlsulfonylphenvl)- 5H-furan-2-one To a solution of 0.6 g of the product of Example 21 in 5 mL of CH2C12 was treated with 1.25 mL of diethylaminosulfur trifluoride at OoC. After stirring for 3 h at room temperature, the reaction mixture was poured into saturated solution of NaHCO3 and extracted with EtOAc mL). The extract was dried over MgSO4 and concentrated. The crude product was purified by flash chromatography eluted with 2:1 hexane/EtOAc to give 400 mg of the title product as a white solid.
1H NMR (CD3COCD 3 d 1.14 1.52 (1H, 1.67 (6H, 1.65 1.80 (1H, 2.20 2.32 (4H, 3.17 (3H, 4.57 (2H, 8.02 (4H, m).
EXAMPLE 23 [l-(fluoromethyl)cyclopropyl]methoxy)-5,5-dimethyl-4-(4methvlsulfonvlphenvl)-5H-furan-2-one A solution of 0.2 g of the product of Example 21 and 0.4 mL of Et3N in 5 mL of CH2C1 2 was cooled at -40C and treated with 0.13 mL of methanesulfonyl chloride. After stirring for 10 min. at -40oC, the reaction was quenched with 10 mL of saturated solution NaHCO3 and extracted with 25 mL of EtOAc. The extract was dried over MgSO4 and concentrated to give the crude mesylate as an oil. The crude mesylate was dissolved in 15 mL of THF and treated with 3 mL of 1M nBu4NF in THF. After stirring at 50oC for lh, the reaction mixture was poured into 50 mL of brine and extracted with 50 mL of EtOAc. The extract was -56- WO 98/41516 PCT/CA98/00225 dried over MgSO4, filtered and concentrated. The crude product was purified by flash chromatography eluted with 1:1 hexane/EtOAc to give 0.13 g of the title compound as a white solid.
1H NMR(CD3COCD 3 d 0.67 (4H, 1.65 (6H, 3.17 (3H, sZ), 4.28 (2H, 4.28 (2H, 8.02 (2H, 8.06 (2H, d).
EXAMPLE 24 3 2 -oxocyclopentyl)oxy)-5,5-dimethyl-4-(4-methylsulfonylphenyl)-5Hfuran-2-one A solution of the hydroxylactone of Example 4 Step 1 (2.19 g, 7.80 mmol) in DMF (10 mL) was added to a suspension of NaH (550 mg, in oil) in DMF (25 ml) at OooC. After 15 minutes n-Bu4NI (1.94 g, 5.30 mmol) was added followed by chlorocyclopentanone (1.66 g, 14.0 mmol) after another 20 minutes. The mixture was allowed to warm to room temperature and stirred for 16 h. The dark solution was poured into 10% aq. HCI (150 mL) and extracted with EtOAc (5x30 mL). The combined organic layers were washed with sat. aq. NaHCO3, and brine, and dried over MgSO4. Evaporation of solvent and chromatography on silica gel using toluene EtOAc gave the title compound (2.1 g, 74%) m.p. 156-157ooC, MS m/z 365 EXAMPLE 3 2 2 -Difluorocyclopentyl)oxy-5,5-dimethyl-4-(4-methylsulfonyl-phenyl)- 5,5-furan-2-one To a solution of the ketone from Example 24 (1.03 g, 2.83 mmol) in 1, 2 -dichloroethane (10 mL) was added DAST (2.28 g, 14.1 mmol, 1.87 mL). The solution was warmed to 45ooC for 2 h, cooled and diluted with dichloromethane (50 mL), and washed with 10% aq. HC1, sat. aq. NaHCO 3 and brine. After drying over MgSO4, evaporation of the solvent and silica gel chromatography using toluene (EtOAc the product was obtained as a colorless powder, 749 mg mp 126- 127oC, MS m/z 387 -57-

Claims (19)

1. A compound of Formula I R 1 S0 2 ,R 7 OQ R 2 O R3 wherein: R is a mono-, di- or tri-substituted C1-1 2 alkyl as hereinbefore defined, or an unsubstituted or mono-, di- or tri-substituted linear or branched C2-10alkenyl, or an unsubstituted or mono-, di- or tri-substituted linear or branched C2-10alkynyl, or an unsubstituted or mono-, di- or tri-substituted C3-i 2 cycloalkenyl, or an unsubstituted or mono-, di- or tri-substituted C5.12cycloalkynyl, wherein the substituents are chosen from the group consisting of 0 halo, selected from F, Cl, Br, and I, OH, CF 3 C 3 6 cycloalkyl, =0, 15 dioxolane, CNand R' is selected from the group consisting of CH 3 NH 2 NHC(O)CF 3 NHCH 3 R 2 and R 3 are independently chosen from the group consisting of hydrogen, Cl.loalkyl, or R 2 and R 3 together with the carbon to which they are attached form a saturated monocyclic carbon ring of 3, 4, 5, 6 or 7 atoms. [I:\DAYLIB\LIBH]28601 .doc:SAK WO 98/41516 PCT/CA98/00225
2. A compound according to Claim 1 wherein R 2 and R3 are each independently methyl.
3. A compound according to Claim 1 wherein R1 is CH3 or NH2.
4. A compound according to Claim 1 wherein R is a mono-, di- or tri-substituted Cl-10alkyl, wherein the substituents are selected from hydroxy, F, Cl and Br. A compound according to Claim 1 wherein R1 is selected from the group consisting of CH3, NH2, R is a mono-, di- or tri-substituted C1-6alkyl, or an unsubstituted or mono-, di- or tri-substituted linear or branched C2-6alkenyl, or an unsubstituted or mono-, di- or tri-substituted linear or branched C2- 6alkynyl, or an unsubstituted or mono-, di- or tri-substituted C3- 6cycloalkenyl, or an unsubstituted or mono-, di- or tri-substituted 8cycloalkynyl, wherein the substituents are chosen from the group consisting of halo, selected from Cl, Br, and F, OH, CF3, CN and R2 and R3 are each independently methyl.
6. A compound according to Claim 1 wherein R1 is selected from the group consisting of CH3, NH2, R is a mono-, di- or tri-substituted C1-4alkyl, or an unsubstituted or mono-, di- or tri-substituted linear or branched C2-4alkenyl wherein the substituents are chosen from the group consisting of -59- WO 98/41516 PCT/CA98/00225 halo, selected from Cl, Br, and F, OH, CF3, CN and R 2 and R 3 are each independently methyl.
7. A compound according to Claim 1 wherein R1 is selected from the group consisting of CH3, R is a mono-, di- or tri-substituted C 1-.4alkyl, linear wherein the substituents are chosen from the group consisting of halo, selected from Cl, Br, and F, OH, CF3, CN and R 2 and R3 are each independently methyl.
8. A compound according to Claim 1 selected from the group consisting of 5,5-Dimethyl-3-(( l-methylallyl)oxy)-4-(4-methylsulfonylphenyl)> 5H-furan-2-one, 5 ,5-Dimethyl-3-( 1,1,1,3,3 3 -hexafluoropropoxy)-4-(4- methylsulfonylphenyl).H.furan2- one, 5,5-Dimethyl-3-(( l-methyl-2-propynyl)oxy)-4-(4. methylsulfonylphenyly..SH.furan.2-one, 1R,2S)-( iS, 2 R)- 2 -hydroxy-1-methylpropyl)oxy)-5s,5-dimethyl-4- 4 -methylsulfonylphenyl).SHfuran-2-.one,, 3 2 -hydroxy-2-methyl-3-butenyl)oxy)-5,5-dcimethyl..4(4. methylsulfonyl)phenylb5H..furan.2.one, 3-(2-Bromo- 1-methylethoxy)-s ,5-dimethyl-4-(4- methylsulfonylphenyl).5H.furan.2.one, 3-Iorpnlx)55dmty-4(-ehlufnlhnl-H furan-2-one, 3 2 S)-3-hydroxy-2-methylpropyl)oxy).ss..cjjmethyl.4(4. methylsulfonylphenyl)..H..furan.2.one, 60 WO 98/41516 PCT/CA98/00225 3 -(((2R)-3-hydroxy-2-methylpropyl)oxy)-5s,5-dimethyl-4-(4- methylsulfonylphenyl)-5H-furan.2-one, 3-(((2R)-3-Fluoro-2-methylpropyl)oxy).5 ,5-dimethyl-4-(4- methylsulfonylphenyl)-5H-furan2-one, (11) 3 2 S)-3-fluoro-2-methylpropyl)oxy)-5s,5-dimethyl-4-(4- methylsulfonylphenyl)-5H-furan2-one, (12) 3-(2-Hydroxy-1-methylethoxy).5 ,5-dimethyl-4-(4- methylsulfonylphenyl)-5H-furan2-.one, (13) 3-(2-Fluoro- l-methylethoxy)-5,5-dimethyl.4-(4. methylsulfonyiphenyl )-5H-furan-2-one, (14) 5,5-iehl4(-ehlufnlpey)-2poyyoy-H furan-2-one, 3-(Allyloxy)-5 ,5-dimethyl-4-(4-methylsulfonylphenyl)..SH-fuan- 2-one, (16) 1,4-dioxaspiro dec-8-yloxy)-5,5-dimethyl4(4. methylsulfonylphenyl)-5H-furan.2one, (17) 3-[(4,4-difluorocyclohexyl)oxy] -5 ,5-dixnethyl-4(4- (methylsulfonylpheny)-5H..furan.2-.one, (18) 5,5-dimethyl-3-(2-methylallyoxy)4(4-(methylsulfonylphenyl)- 5H-furan-2-one, (19) 5,5-Diinethyl-3- [(l-methylcyclopropyl)methoxy] methylsulfonylphenyl)-5H..furan.2-.one, [2-(fluoromethyl)allyl] oxy)-5 ,5-dimethyl-4-(4- methylsulfonylpheny)-5H..furan.2-.one, (21) 3-1 [l-(hydroxymethyl)cyclopropyllmethoxy) -5,5-dimethyl-4-(4- methylsulfonylphenyl)2H-furan-2..one, (22) 3- l-fluorocyclobutyl)xnethoxy] -5 ,5-dimethyl-4-(4- methylsulfonylpheny).5TH-furan.2-.one, (23) 3-1 [l-(fluoromethyl)cyclopropyl] methoxy) -5 ,5-dimethyl-4-(4- methylsulfonylpheny1)-5H-furan.2-.one, (24) 3 2 -oxocyclopenty1)oxy)-5,5-dimethy..4.(4-methylsulfonylpheny)- 5H-furan-2-one, and 3 2 2 -difluorocyclopentyl)oxy55-dimethyl-4(4. methylsulfonylphenyl)..s,5-furan-2-one. 61 62
9. A methylsulfonylphenyl-2-(5H)-furanone derivative, substantially as hereinbefore described with reference to any one of the examples. A compound according to claim 1 wherein said compound is 3-(1- cyclopropylethoxy)-44-(-methylsulfonyl)phenyl-5H-furan-2-one.
11. A compound according to claim 1 wherein said compound is 3-(1- -dimethyl-4-(4-methylsulfonyl)phenyl-5H-furan-2-one.
12. A process of preparing a methylsulfonylphenyl-2-(5H)-furanone derivative, said process being substantially as hereinbefore described with reference to any one of the examples.
13. A methylsulfonylphenyl-2-(5H)-furanone derivative prepared according to the process of claim 12.
14. A pharmaceutical composition comprising: a non-toxic therapeutically Si.. effective amount of a compound according to any one of claims 1 to 9 and a pharmaceutically acceptable carrier. 15 15. A method of treating an inflammatory disease susceptible to treatment with an non-steroidal anti-inflammatory agent comprising: administration to a patient in need of such treatment of a non-toxic therapeutically effective amount of a compound according to any one of claims 1 to 9 or of a composition according to claim 14.
16. The method of claim 15 wherein the patient is a human. 20 17. A compound according to any one of claims 1 to 9, or a composition according to claim 14, when used for treating an inflammatory disease susceptible to treatment with an non-steroidal anti-inflammatory agent.
18. A compound according to any one of claims 1 to 9, or a composition according to claim 14, for use in treating an inflammatory disease susceptible to treatment with an non-steroidal anti-inflammatory agent.
19. Use of a compound according to any one of claims 1 to 9, in the manufacture of a medicament for treating an inflammatory disease susceptible to treatment with an non-steroidal anti-inflammatory agent. A method of treating cyclooxygenase mediated diseases advantageously treated by an active agent that selectively inhibits COX-2 in preference to COX-1 comprising: administration to a patient in need of such treatment of a non-toxic therapeutically effective amount of a compound according to any one of claims 1 to 9 or of a composition according to claim 14. S21. The method of claim 20 wherein the patient is a human. C07282 63
22. A compound according to any one of claims 1 to 9, or a composition according to claim 14, when used for treating cyclooxygenase mediated diseases advantageously treated by an active agent that selectively inhibits COX-2 in preference to COX-1.
23. A compound according to any one of claims 1 to 9, or a composition according to claim 14, for use in treating cyclooxygenase mediated diseases advantageously treated by an active agent that selectively inhibits COX-2 in preference to COX-1.
24. Use of a compound according to any one of claims 1 to 9, in the manufacture of a medicament for treating cyclooxygenase mediated diseases advantageously treated by an active agent that selectively inhibits COX-2 in preference to COX-1.
25. A compound of any one of claims 1 to 9 for use in therapy. Dated 30 May 2001 MERCK FROSST CANADA CO. Patent Attorneys for the Applicant/Nominated Person SPRUSON FERGUSON 9 4 C07282
AU67142/98A 1995-10-13 1998-03-12 (Methylsulfonyl)phenyl-2-(5H)-furanones with oxygen link as cox-2 inhibitors Ceased AU741981B2 (en)

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US60/005371 1995-10-13
US60/008074 1995-10-30
GB9602877 1996-02-13
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US60/011637 1996-02-14
GB9605645 1996-03-18
AU71236/96A AU703871B2 (en) 1995-10-13 1996-10-09 (Methylsulfonyl)phenyl-2-(5H)-furanones as cox-2 inhibitors
AU72736/96A AU711902C (en) 1995-10-30 1996-10-29 3,4-diaryl-2-hydroxy-2,5-dihydrofurans as prodrugs to cox-2 inhibitors
AU67142/98A AU741981B2 (en) 1995-10-13 1998-03-12 (Methylsulfonyl)phenyl-2-(5H)-furanones with oxygen link as cox-2 inhibitors
PCT/CA1998/000225 WO1998041516A1 (en) 1997-03-14 1998-03-12 (methylsulfonyl)phenyl-2-(5h)-furanones with oxygen link as cox-2 inhibitors

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