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Definitions

• the present invention relates to a chemical genus of biaryl substituted heterocycle inhibitors of LTA4H (leukotriene A4 hydrolase) useful for the treatment and prevention and prophylaxis of inflammatory diseases and disorders.
• LTA4H leukotriene A4 hydrolase
• the end products of the leukotriene pathway are potent inflammatory lipid mediators derived from arachidonic acid. They can potentially contribute to development of atherosclerosis and destabilization of atherosclerotic plaques through lipid oxidation and/or proinflammatory effects.
• MI myocardial infarction
• ALOX5AP hereinafter referred to as an MI disease gene, comprises nucleic acid that encodes 5-lipoxygenase activating protein (FLAP), herein after referred to as FLAP.
• DNA variants in the FLAP gene increase risk for myocardial infarction by 1.8 fold and for stroke by 1.7 fold.
• Leukotriene B4 is one of the most potent chemokine mediators of arterial inflammation.
• Particular DNA variants in the gene encoding LTA4H also elevate risk for MI and stroke, as described elsewhere [Hakonarsson et al., J. Am. Med. Assoc. 293, 2245-2256 (2005)].
• Individuals with a prior history of MI produce more leukotriene B4 when their isolated neutrophils are stimulated with ionomycin.
• Increased LTB4 production is particularly marked in male patients with a prior history of MI who carry risk variants in the FLAP gene [Helgadottir et al.].
• the treatment (prophylactic and/or therapeutic) of certain diseases and conditions e.g., MI, acute coronary syndrome (ACS), stroke, atherosclerosis
• MI acute coronary syndrome
• stroke atherosclerosis
• Inhibiting LTA4H is advantageous for methods of treatment for MI or susceptibility to MI; for ACS (e.g., unstable angina, non-ST-elevation myocardial infarction (NSTEMI) or ST-elevation myocardial infarction (STEMI)); for decreasing risk of a second MI; for stroke (including transient ischemic attack) or susceptibility to stroke; for atherosclerosis, such as for patients requiring treatment (e.g., angioplasty, stents, coronary artery bypass graft) to restore blood flow in coronary arteries, such as patients requiring treatment for peripheral vascular disease including peripheral occlusive arterial disease, critical limb ischemia (e.g., gangrene, ulceration), and intermittent claudication to restore blood flow in the lower limbs; for atherosclerotic reno-vascular disease; for abdominal aortic aneurysm; and/or for decreasing leukotriene synthesis (e.g., for treatment of MI).
• US Patent Application Publication No. 20050043378 and 20050043379 relate to benzooxazol-2-yl, benzothiazol-2-yl and 1H-benzoimidazol-2-yl compounds and derivatives thereof useful as leukotriene A4 hydrolase (LTA4H) inhibitors in treating inflammation and disorders associated with inflammation.
• LTA4H leukotriene A4 hydrolase
• the present invention relates to compounds exhibiting LTA4H enzyme inhibition, having general formula ⁇ In these compounds,
• the invention in a second aspect, relates to a method for inhibiting leukotriene A4 hydrolase including contacting the LTA4H enzyme with a therapeutically effective amount of a compound of formula ⁇ .
• the invention in a third aspect, relates to a pharmaceutical composition
• a pharmaceutical composition comprising a pharmaceutically acceptable carrier and a therapeutically effective amount of a compound of formula ⁇ .
• the invention relates to methods for the treatment and prevention or prophylaxis of a disease, condition or disorder associated with leukotriene A4 hydrolase.
• the methods comprise administering to a mammal a therapeutically effective amount of a compound described above.
• the disease or condition may be related to allergic, acute or chronic inflammation.
• the disease may be for example contact and atopic dermatitis, arthritis, allergic rhinitis, asthma or autoimmune diseases such as Crohn's disease, psoriasis, ulcerative colitis, inflammatory bowel disease, multiple sclerosis, ankylosing spondylitis, and the like.
• the compounds defined above can be used in preventing recurring inflammatory attacks.
• the compounds are also useful for treating and preventing atherosclerosis, thrombosis, stroke, acute coronary syndrome, stable angina, peripheral vascular disease, critical leg ischemia, intermittent claudication, abdominal aortic aneurysm and myocardial infarction.
• Compounds of the invention which inhibit tumor growth and metastase find utility in the treatment and prevention of cancer, including espophageal cancer, brain cancer.
• the invention relates to compounds of the general formula ⁇ below. All of the compounds falling within the foregoing parent genus and its subgenera are useful as leukotriene A4 hydrolase inhibitors, but not all the compounds are novel. In particular, certain known species fall within the genus ⁇ , although no utility in inhibiting LTA4H has been suggested for these species. It may be found upon examination that compounds that have been excluded from the claims to compounds are patentable to the inventors in this application, it may also be found that additional species and genera not presently excluded are not patentable to the inventors in this application. In either case, the exclusion of species and genera in applicants' claims are to be considered artifacts of patent prosecution and not reflective of the inventors' concept or description of their invention.
• the invention in a composition aspect, is all compounds of formula ⁇ except those that are in the public's possession. In particular, a search of the literature indicates that the following three subgenera encompass compounds that cannot be claimed:
• the genus ⁇ encompasses four subgenera, depending on the T 1 /T 2 ring: 2,5-pyridinyl, reverse 2,5-pyridinyl, meta phenylene and para phenylene:
• the invention relates to biaryl heterocycles useful as LTA4H enzyme inhibitors, having the general formula:
• Q is selected from O, S(O) p and NR 1 .
• X is selected from CH 2 , O and NR 1 .
• the T 1 /T 2 ring is para phenylene:
• HET is selected from the group consisting of pyrrolidinone, pyrrolidine, piperidine, piperidinone, piperazine, morpholine, thiomorpholine, thiazolidine, thiazolidinone, oxazolidine and oxazolidinone and substituted pyrrolidinone, substituted pyrrolidine, substituted piperidine, substituted piperidinone, substituted piperazine, substituted morpholine, substituted thiomorpholine, substituted thiazolidine, substituted thiazolidinone, substituted oxazolidine and substituted oxazolidinone.
• HET is pyrrolidine and the Z-W combination is other than hydrogen.
• HET-Z-W is selected from pyridinylmethylpyrrolidine, oxadiazolylmethylpyrrolidine, carboxyalkylpyrrolidine and alkoxycarbonylalkylpyrrolidine.
• HET-Z-W is carboxyalkyl pyrrolidine, having the chemical formula as shown below: wherein q is an integer selected from 2-6.
• HET is selected from the group consisting of unsubstituted pyrrolidine, pyrrolidinone, piperidine and piperidinone (i.e. Z-W is H).
• HET-Z-W is carboxyalkyl(S)pyrrolidine, having the chemical formula as shown below: wherein q is an integer selected from 2-6.
• HET is (R) pyrrolidine having the chemical formula as shown below:
• HET is (R) pyrrolidine and ZW is H, having chemical formula as shown below:
• HET is (R) pyrrolidine
• X is selected from CH 2 , O and NR 1 .
• HET is (R) pyrrolidine
• X is CH 2 or O
• n is 1
• Ar is selected from phenyl and substituted phenyl
• X is selected from CH 2 , O and NR 1
• X is CH 2 or O
• n is 1
• Ar is para-substituted phenyl.
• Ar is heteroarylphenyl.
• Ar is wherein the wavy line indicates the point of attachment to X and R 2 is chosen from hydrogen, halogen, trifluoromethyl, methyl, methoxy, thienyl, furanyl, and thienyl or furanyl substituted with halogen, trifluoromethyl, methyl or methoxy.
• HET is (S) pyrrolidine, having chemical formula as shown below: Where R 3 represents halogen, CF 3 , methyl, methoxy, or CF 3 O.
• R 3 represents halogen, CF 3 , methyl, methoxy, or CF 3 O.
• X is O or CH 2
• n is 1 or 2
• Z is C 1 -C 4 alkylene and W is COOH.
• HET is (S) pyrrolidine
• Q is oxygen
• Ar is substituted phenyl, having chemical formula as shown below: wherein R 3 represents one to three residues independently selected from the group consisting of benzyl, benzyloxy, phenyl and heteroaryl.
• Ar is phenyl substituted with heteroaryl or heteroaryl substituted with a substituent selected from the group consisting of halogen, methyl, methoxy and trifluoromethoxy.
• Thienyl and furanyl are examples of heteroaryl.
• the T 1 /T 2 ring is either pyridine and Q is oxygen or the T 1 /T 2 ring is para phenylene, and Q is —NR 1 — or —S(O) p —.
• Exemplary generic formulae are: In these compounds, the variables may be as described above for the genus in which Q is —O— and the T 1 /T 2 ring is p-phenylene.
• the present invention provides a pharmaceutical composition
• a pharmaceutical composition comprising a pharmaceutically acceptable carrier and a therapeutically effective amount of at least one compound as described above.
• Methods of the invention parallel the compositions and formulations.
• the methods comprise administering to a patient in need of treatment a therapeutically effective amount of a compound according to the invention.
• the present invention provides a method for inhibiting leukotriene A4 hydrolase comprising contacting the LTA4H enzyme with a therapeutically effective amount of a compound according to formula ⁇ .
• the method for inhibiting leukotriene A4 hydrolase includes contacting the LTA4H enzyme with a therapeutically effective amount of a compound of formula: and any of its subgenera as described above.
• the invention also relates to a method for inhibiting leukotriene A4 hydrolase comprising contacting the LTA4H enzyme with a therapeutically effective amount of a compound of formula:
• the present invention provides a method for inhibiting a disorder associated with leukotriene A4 hydrolase comprising administering to a mammal a therapeutically effective amount of a compound or a salt, hydrate or ester thereof according to formula ⁇ .
• the disorder is associated with inflammation.
• the disorder is selected from allergic inflammation, acute inflammation and chronic inflammation.
• the present invention also provides a method for treating inflammation comprising administering to a mammal a therapeutically effective amount of a compound according to formula ⁇ and an inhibitor of 5-lipoxygenase activating protein (FLAP) [e.g. MK-0591 (Merck), BAY-X1005 (Bayer), and R-( ⁇ )-2-[4-quinolin-2-yl-methoxy)phenyl]-2-cyclopentyl acetic acid] and/or a therapeutically effective amount of a compound of formula ⁇ and a leukotriene B4 (LTB4) antagonist [e.g.
• FLAP 5-lipoxygenase activating protein
• SC 41930 (Searle), SC 53228 (Searle), Accolate (zafirlukast; Zeneca), Singulair (montelukast; Merck), Ultair (pranlukast; Ono/Smith-Kline Beecham), ethyl [[4-[[3-[[4-[1-(4-hydroxyphenyl)-1-methylethyl]phenoxy]methyl]benzyl]oxy]phenyl]-(imino)methyl]carbamate (amelubant; Boehringer Ingelheim), 2-[3-[3-[3-[(5-ethyl-4′-fluoro-2-hydroxybiphenyl-4-yl)oxy]propoxy]-2-propylphenoxy]benzoic acid (etalocib, Lilly) and CP-105696 (+)-1-(3S,4R)-[3-(4-phenyl-benzyl)-4-hydroxy-chroman-7-yl]
• Compounds of the genus represented by formula ⁇ above are inhibitors of LTA 4 H enzyme. As such they have utility in treating and preventing inflammatory diseases and disorders, as described above, particularly for such conditions as asthma, chronic obstructed pulmonary disease (COPD), atherosclerosis, rheumatoid arthritis, multiple sclerosis, inflammatory bowel diseases (IBD; including Crohn's disease and ulcerative colitis), or psoriasis, which are each characterized by excessive or prolonged inflammation at some stage of the disease.
• COPD chronic obstructed pulmonary disease
• IBD inflammatory bowel diseases
• IBD inflammatory bowel diseases
• psoriasis which are each characterized by excessive or prolonged inflammation at some stage of the disease.
• the compounds may be presented as salts.
• pharmaceutically acceptable salt refers to salts whose counter ion derives from pharmaceutically acceptable non-toxic acids and bases.
• Suitable pharmaceutically acceptable base addition salts for the compounds of the present invention include, but are not limited to, metallic salts made from aluminum, calcium, lithium, magnesium, potassium, sodium and zinc or organic salts made from lysine, N,N-dialkyl amino acid derivatives (e.g.
• suitable pharmaceutically acceptable base addition salts for the compounds of the present invention include inorganic acids and organic acids.
• Examples include acetate, benzenesulfonate (besylate), benzoate, bicarbonate, bisulfate, carbonate, camphorsulfonate, citrate, ethanesulfonate, fumarate, gluconate, glutamate, bromide, chloride, isethionate, lactate, maleate, malate, mandelate, methanesulfonate, mucate, nitrate, pamoate, pantothenate, phosphate, succinate, sulfate, tartrate, p-toluenesulfonate, and the like.
• Alkyl is intended to include linear, branched, or cyclic hydrocarbon structures and combinations thereof.
• Lower alkyl refers to alkyl groups of from 1 to 6 carbon atoms. Examples of lower alkyl groups include methyl, ethyl, propyl, isopropyl, butyl, s- and t-butyl and the like. Preferred alkyl groups are those of C 20 or below.
• Cycloalkyl is a subset of alkyl and includes cyclic hydrocarbon groups of from 3 to 8 carbon atoms. Examples of cycloalkyl groups include c-propyl, c-butyl, c-pentyl, norbornyl and the like.
• C 1 to C 20 hydrocarbon includes alkyl, cycloalkyl, alkenyl, alkynyl, aryl, arylalkyl and combinations thereof. Examples include phenethyl, cyclohexylmethyl, camphoryl, adamantyl and naphthylethyl.
• Alkoxy or alkoxyl refers to groups of from 1 to 8 carbon atoms of a straight, branched, cyclic configuration and combinations thereof attached to the parent structure through oxygen. Examples include methoxy, ethoxy, propoxy, isopropoxy, cyclopropyloxy, cyclohexyloxy and the like. Lower-alkoxy refers to groups containing one to four carbons.
• Alkoxyalkyl refers to ether groups of from 3 to 8 atoms of a straight, branched, cyclic configuration and combinations thereof attached to the parent structure through an alkyl. Examples include methoxymethyl, methoxyethyl, ethoxypropyl, and the like.
• Alkoxyaryl refers to alkoxy substituents attached to an aryl, wherein the aryl is attached to the parent structure.
• Arylalkoxy refers to aryl substituents attached to an oxygen, wherein the oxygen is attached to the parent structure.
• Substituted arylalkoxy refers to a substituted aryl substituent attached to an oxygen, wherein the oxygen is attached to the parent structure.
• Acyl refers to groups of from 1 to 8 carbon atoms of a straight, branched, cyclic configuration, saturated, unsaturated and aromatic and combinations thereof, attached to the parent structure through a carbonyl functionality.
• One or more carbons in the acyl residue may be replaced by nitrogen, oxygen or sulfur as long as the point of attachment to the parent remains at the carbonyl. Examples include acetyl, benzoyl, propionyl, isobutyryl, t-butoxycarbonyl, benzyloxycarbonyl and the like.
• Lower-acyl refers to groups containing one to four carbons.
• Aryl and heteroaryl mean a 5- or 6-membered aromatic or heteroaromatic ring containing 0-3 heteroatoms selected from O, N, or S, a bicyclic 9- or 10-membered aromatic or heteroaromatic ring system containing 0-3 heteroatoms selected from O, N, or S; or a tricyclic 13- or 14-membered aromatic or heteroaromatic ring system containing 0-3 heteroatoms selected from O, N, or S.
• the aromatic 6- to 14-membered carbocyclic rings include, e.g., benzene and naphthalene, and according to the invention benzoxalane and residues in which one or more rings are aromatic, but not all need be.
• the 5- to 10-membered aromatic heterocyclic rings include, e.g., imidazole, pyridine, indole, thiophene, benzopyranone, thiazole, furan, benzimidazole, quinoline, isoquinoline, quinoxaline, pyrimidine, pyrazine, tetrazole and pyrazole.
• Arylalkyl refers to a substituent in which an aryl residue is attached to the parent structure through alkyl. Examples are benzyl, phenethyl and the like. Heteroarylalkyl refers to a substituent in which a heteroaryl residue is attached to the parent structure through alkyl. Examples include, e.g., pyridinylmethyl, pyrimidinylethyl and the like. Heterocyclylalkyl refers to a substituent in which a heterocyclyl residue is attached to the parent structure through alkyl. Examples include morpholinoethyl and pyrrolidinylmethyl.
• Heterocycle means a cycloalkyl or aryl residue in which from one to three carbons is replaced by a heteroatom selected from the group consisting of N, O and S.
• the nitrogen and sulfur heteroatoms may optionally be oxidized, and the nitrogen heteroatom may optionally be quaternized.
• heterocycles include pyrrolidine, pyrazole, pyrrole, indole, quinoline, isoquinoline, tetrahydroisoquinoline, benzofuran, benzodioxan, benzodioxole (commonly referred to as methylenedioxyphenyl, when occurring as a substituent), tetrazole, morpholine, thiazole, pyridine, pyridazine, pyrimidine, thiophene, furan, oxazole, oxazoline, isoxazole, dioxane, tetrahydrofuran and the like.
• heteroaryl is a subset of heterocycle in which the heterocycle is aromatic.
• heterocyclyl residues additionally include piperazinyl, 2-oxopiperazinyl, 2-oxopiperidinyl, 2-oxo-pyrrolidinyl, 2-oxoazepinyl, azepinyl, 4-piperidinyl, pyrazolidinyl, imidazolyl, imidazolinyl, imidazolidinyl, pyrazinyl, oxazolidinyl, isoxazolidinyl, thiazolidinyl, isothiazolyl, quinuclidinyl, isothiazolidinyl, benzimidazolyl, thiadiazolyl, benzopyranyl, benzothiazolyl, tetrahydrofuryl, tetrahydropyranyl, thienyl, benzothienyl, thiamorpholinyl, thiamorph
• An oxygen heterocycle is a heterocycle containing at least one oxygen in the ring; it may contain additional oxygens, as well as other heteroatoms.
• a sulphur heterocycle is a heterocycle containing at least one sulphur in the ring; it may contain additional sulphurs, as well as other heteroatoms.
• a nitrogen heterocycle is a heterocycle containing at least one nitrogen in the ring; it may contain additional nitrogens, as well as other heteroatoms.
• Oxygen heteroaryl is a subset of oxygen heterocycle; examples include furan and oxazole.
• Sulphur heteroaryl is a subset of sulphur heterocycle; examples include thiophene and thiazine.
• Nitrogen heteroaryl is a subset of nitrogen heterocycle; examples include pyrrole, pyridine and pyrazine.
• a saturated nitrogenous heterocycle is a subset of nitrogen heterocycle.
• Saturated nitrogenous heterocycle contain at least one nitrogen and may contain additional nitrogens, as well as other heteroatoms. Examples include pyrrolidine, pyrazolidine, piperidine, morpholine, and thiomorpholine.
• Substituted alkyl, aryl, cycloalkyl, heterocyclyl etc. refer to alkyl, aryl, cycloalkyl, or heterocyclyl wherein up to three H atoms in each residue are replaced with halogen, haloalkyl, hydroxy, loweralkoxy, carboxy, carboalkoxy (also referred to as alkoxycarbonyl), carboxamido (also referred to as alkylaminocarbonyl), cyano, carbonyl, nitro, amino, alkylamino, dialkylamino, mercapto, alkylthio, sulfoxide, sulfone, acylamino, amidino, phenyl, benzyl, heteroaryl, phenoxy, benzyloxy, or heteroaryloxy.
• halogen and “halo” refer to fluorine, chlorine, bromine or iodine.
• the compounds of this invention can exist in radiolabeled form, i.e., the compounds may contain one or more atoms containing an atomic mass or mass number different from the atomic mass or mass number usually found in nature.
• Radioisotopes of hydrogen, carbon, phosphorous, fluorine, and chlorine include 2 H, 3 H, 13 C, 14 C, 15 N, 35 S, 18 F, and 36 Cl, respectively.
• Compounds that contain those radioisotopes and/or other radioisotopes of other atoms are within the scope of this invention.
• Tritiated, i.e. 3 H, and carbon-14, i.e., 14 C, radioisotopes are particularly preferred for their ease in preparation and detectability.
• Radiolabeled compounds of formula ⁇ of this invention and prodrugs thereof can generally be prepared by methods well known to those skilled in the art. Conveniently, such radiolabeled compounds can be prepared by carrying out the procedures disclosed in the Examples and Schemes by substituting a readily available radiolabeled reagent for a non-radiolabeled reagent.
• a compound As used herein, and as would be understood by the person of skill in the art, the recitation of “a compound” is intended to include salts, solvates, co-crystals and inclusion complexes of that compound. It also includes all polymorphs of the compound in crystalline form.
• solvate refers to a compound of formula I in the solid state, wherein molecules of a suitable solvent are incorporated in the crystal lattice.
• a suitable solvent for therapeutic administration is physiologically tolerable at the dosage administered.
• suitable solvents for therapeutic administration are ethanol and water. When water is the solvent, the solvate is referred to as a hydrate.
• solvates are formed by dissolving the compound in the appropriate solvent and isolating the solvate by cooling or using an antisolvent. The solvate is typically dried or azeotroped under ambient conditions.
• Co-crystals are combinations of two or more distinct molecules arranged to create a unique crystal form whose physical properties are different from those of its pure constituents.
• the compounds described herein may contain asymmetric centers and may thus give rise to enantiomers, diastereomers, and other stereoisomeric forms. Each chiral center may be defined, in terms of absolute stereochemistry, as (R)- or (S)-.
• the present invention is meant to include all such possible isomers, as well as, their racemic and optically pure forms.
• Optically active (R)- and (S)-isomers may be prepared using chiral synthons or chiral reagents, or resolved using conventional techniques.
• the prefix “rac” refers to a racemate.
• a protecting group refers to a group, which is used to mask a functionality during a process step in which it would otherwise react, but in which reaction is undesirable.
• the protecting group prevents reaction at that step, but may be subsequently removed to expose the original functionality. The removal or “deprotection” occurs after the completion of the reaction or reactions in which the functionality would interfere.
• the compounds of the present invention may be prepared by the methods illustrated in the general reaction schemes as, for example, described below, or by modifications thereof, using readily available starting materials, reagents and conventional synthesis procedures. In these reactions, it is also possible to make use of variants that are in themselves known, but are not mentioned here.
• the starting materials for example in the case of suitably substituted benzimidazole ring compounds, are either commercially available, synthesized as described in the examples or may be obtained by the methods well known to persons of skill in the art.
• LTA4H inhibitors have been shown to be effective anti-inflammatory agents in pre-clinical studies.
• oral administration of LTA4H inhibitor SC57461 to rodents resulted in the inhibition of ionophore-induced LTB4 production in mouse blood ex vivo, and in rat peritoneum in vivo (Kachur et al., 2002, J. Pharm. Exp. Ther. 300(2), 583-587).
• eight weeks of treatment with the same inhibitor compound significantly improved colitis symptoms in a primate model (Penning, 2001, Curr. Pharm. Des. 7(3): 163-179).
• the spontaneous colitis that develops in these animals is very similar to human IBD. Therefore persons of skill in the art accept that positive results in LTA4H models are predictive of therapeutic utility in this and other human inflammatory diseases.
• the inflammatory response is characterized by pain, increased temperature, redness, swelling, or reduced function, or by a combination of two or more of these symptoms.
• inflammation, inflammatory diseases or inflammation-mediated diseases or conditions include, but are not limited to, acute inflammation, allergic inflammation, and chronic inflammation.
• Autoimmune diseases are associated with chronic inflammation.
• organ-specific directed mainly at one organ
• non-organ-specific affecting multiple organs.
• organ-specific autoimmune disorders are insulin-dependent diabetes (Type I) which affects the pancreas, Hashimoto's thyroiditis and Graves' disease which affect the thyroid gland, pernicious anemia, which affects the stomach, Cushing's disease and Addison's disease, which affect the adrenal glands, chronic active hepatitis, which affects the liver; polycystic ovary syndrome (PCOS), celiac disease, psoriasis, inflammatory bowel disease (IBD) and ankylosing spondylitis.
• Type I insulin-dependent diabetes
• PCOS polycystic ovary syndrome
• celiac disease celiac disease
• psoriasis inflammatory bowel disease
• IBD inflammatory bowel disease
• ankylosing spondylitis ankylosing spondylitis
• non-organ-specific autoimmune disorders are rheumatoid arthritis, multiple sclerosis, systemic lupus and myasthenia gravis.
• the compounds, compositions and methods of the present invention are useful in treating cancer.
• Leukotriene synthesis has been shown to be associated with different types of cancer including esophageal cancer, brain cancer, pancreatic cancer, colon cancer.
• the terms “methods of treating or preventing” mean amelioration, prevention or relief from the symptoms and/or effects associated with lipid disorders.
• the term “preventing” as used herein refers to administering a medicament beforehand to forestall or obtund an acute episode.
• the person of ordinary skill in the medical art recognizes that the term “prevent” is not an absolute term.
• in the medical art it is understood to refer to the prophylactic administration of a drug to substantially diminish the likelihood or seriousness of a condition, and this is the sense intended in applicants' claims.
• reference to “treatment” of a patient is intended to include prophylaxis. Throughout this application, various references are referred to. The disclosures of these publications in their entireties are hereby incorporated by reference as if written herein.
• administering includes administering prodrug forms (e.g. esters) so as to provide effective levels of the compound in the subject.
• prodrug refers to a compound that is made more active in vivo. Activation in vivo may come about by chemical action or through the intermediacy of enzymes. Microflora in the GI tract may also contribute to activation in vivo.
• Common esters employed as prodrugs are methyl, ethyl and oxaalkyl esters. For example, under appropriate circumstances may be considered a prodrug of
• routes of administration are possible including, but not necessarily limited to parenteral (e.g., intravenous, intra-arterial, intramuscular, subcutaneous injection), oral (e.g., dietary or by inhalation), topical, nasal, rectal, or via slow releasing micro-carriers depending on the disease or condition to be treated.
• parenteral e.g., intravenous, intra-arterial, intramuscular, subcutaneous injection
• oral e.g., dietary or by inhalation
• topical nasal, rectal, or via slow releasing micro-carriers depending on the disease or condition to be treated.
• parenteral and intravenous administration are preferred modes of administration.
• mamal is used in its dictionary sense. Humans are included in the group of mammals, and humans would be the preferred subjects.
• the present invention provides a pharmaceutical composition comprising a compound of formula I, or a pharmaceutically acceptable salt or solvate thereof, together with one or more pharmaceutically carriers thereof and optionally one or more other therapeutic ingredients.
• the carrier(s) must be “acceptable” in the sense of being compatible with the other ingredients of the formulation and not deleterious to the recipient thereof.
• the formulations include those suitable for oral, parenteral (including subcutaneous, intradermal, intramuscular, intravenous and intraarticular), rectal and topical (including dermal, buccal, sublingual and intraocular) administration.
• the most suitable route may depend upon the condition and disorder of the recipient.
• the formulations may conveniently be presented in unit dosage form and may be prepared by any of the methods well known in the art of pharmacy. All methods include the step of bringing into association a compound of formula ⁇ or a pharmaceutically acceptable salt or solvate thereof (“active ingredient”) with the carrier, which constitutes one or more accessory ingredients.
• active ingredient a compound of formula ⁇ or a pharmaceutically acceptable salt or solvate thereof
• the formulations are prepared by uniformly and intimately bringing into association the active ingredient with liquid carriers or finely divided solid carriers or both and then, if necessary, shaping the product into the desired formulation.
• Formulations of the present invention suitable for oral administration may be presented as discrete units such as capsules, cachets or tablets each containing a predetermined amount of the active ingredient; as a powder (including micronized and nanoparticulate powders) or granules; as a solution or a suspension in an aqueous liquid or a non-aqueous liquid; or as an oil-in-water liquid emulsion or a water-in-oil liquid emulsion.
• the active ingredient may also be presented as a bolus, electuary or paste.
• a tablet may be made by compression or molding, optionally with one or more accessory ingredients.
• Compressed tablets may be prepared by compressing in a suitable machine the active ingredient in a free-flowing form such as a powder or granules, optionally mixed with a binder, lubricant, inert diluent, lubricating, surface active or dispersing agent.
• Molded tablets may be made by molding in a suitable machine a mixture of the powdered compound moistened with an inert liquid diluent.
• the tablets may optionally be coated or scored and may be formulated so as to provide sustained, delayed or controlled release of the active ingredient therein.
• the pharmaceutical compositions may include a “pharmaceutically acceptable inert carrier”, and this expression is intended to include one or more inert excipients, which include starches, polyols, granulating agents, microcrystalline cellulose, diluents, lubricants, binders, disintegrating agents, and the like. If desired, tablet dosages of the disclosed compositions may be coated by standard aqueous or nonaqueous techniques, “Pharmaceutically acceptable carrier” also encompasses controlled release means.
• compositions of the present invention may also optionally include other therapeutic ingredients, anti-caking agents, preservatives, sweetening agents, colorants, flavors, desiccants, plasticizers, dyes, and the like. Any such optional ingredient must, of course, be compatible with the compound of the invention to insure the stability of the formulation.
• the dose range for adult humans is generally from 0.1 ⁇ g to 10 g/day orally. Tablets or other forms of presentation provided in discrete units may conveniently contain an amount of compound of the invention which is effective at such dosage or as a multiple of the same, for instance, units containing 0.1 mg to 500 mg, usually around 5 mg to 200 mg. The precise amount of compound administered to a patient will be the responsibility of the attendant physician.
• the dose employed will depend on a number of factors, including the age and sex of the patient, the precise disorder being treated, and its severity.
• the frequency of administration will depend on the pharmacodynamics of the individual compound and the formulation of the dosage form, which may be optimized by methods well known in the art (e.g. controlled or extended release tablets, enteric coating etc.).
• Combination therapy can be achieved by administering two or more agents, each of which is formulated and administered separately, or by administering two or more agents in a single formulation.
• Other combinations are also encompassed by combination therapy.
• two agents can be formulated together and administered in conjunction with a separate formulation containing a third agent. While the two or more agents in the combination therapy can be administered simultaneously, they need not be.
• administration of a first agent (or combination of agents) can precede administration of a second agent (or combination of agents) by minutes, hours, days, or weeks.
• the two or more agents can be administered within minutes of each other or within any number of hours of each other or within any number or days or weeks of each other. In some cases even longer intervals are possible.
• Combination therapy can also include two or more administrations of one or more of the agents used in the combination. For example, if agent X and agent Y are used in a combination, one could administer them sequentially in any combination one or more times, e.g., in the order X-Y-X, X-X-Y, Y-X-Y, Y-Y-X, X-X-Y-Y, etc.
• the compounds of formula ⁇ have utility in treating and preventing inter alia inflammation.
• the compounds and compositions can be used advantageously in combination with other agents useful in treating and preventing inflammatory conditions and for treating and preventing atherosclerosis, thrombosis, stroke, acute coronary syndrome, stable angina, peripheral vascular disease, critical leg ischemia, intermittent claudication, abdominal aortic aneurysm and myocardial infarction.
• agents include FLAP inhibitors and LTB4 antagonists.
• the compounds of the present invention may be prepared by the methods illustrated in the general reaction schemes as, for example, described below, or by modifications thereof, using readily available starting materials, reagents and conventional synthesis procedures.
• Scheme II (i) (a) CuI, Cs2CO3, N,N-dimethylglycine, (b) BBr3, CH2Cl2
• Example 2 4-[(S)-2-(4-benzyl-phenoxymethyl)-pyrrolidin-1-yl]-butyric acid methyl ester: To a solution of Example 2 (1.5 g, 4.94 mmol) in DMF (23 mL) was added potassium carbonate (1.4 g, 10.1 mmol) and methyl 4-bromobutyrate (0.72 mL, 6.26 mmol). The resulting slurry was stirred at ambient temperature overnight. The solvent was concentrated under reduced pressure and the crude product was taken up in ethyl acetate. The organic portion was washed with water, washed with brine, dried over Na 2 SO 4 , filtered and concentrated in vacuo. The crude product was purified by silica gel flash chromatography using hexane/EtOAc (gradient system) to give the title compound (0.73 g, 40%) as a yellow oil.
• Example 1 4-[(R)-2-(4-benzyl-phenoxymethyl)-pyrrolidin-1-ylmethyl]-pyridine: To a solution of Example 1 (0.25 g, 0.82 mmol) in dichloromethane (2 mL) was added 4-picolyl chloride hydrochloride (0.13 g, 0.79 mmol) and triethylamine (0.29 mL, 2.08 mmol). The resulting mixture was stirred at ambient temperature overnight. The crude product was extracted into dichloromethane and washed with water followed by brine. The combined organic layers were dried over anhydrous Na 2 SO 4 , filtered and concentrated in vacuo.
• Example 1 4-[(R)-2-(4-benzyl-phenoxymethyl)-pyrrolidin-1-yl]-butyric acid methyl ester: To a solution of Example 1 (0.5 g, 1.65 mmol) in dichloromethane (4.8 mL) was added triethylamine (0.46 mL, 3.30 mmol) and methyl 4-bromobutyrate (0.24 mL, 1.90 mmol) The resulting solution was stirred at ambient temperature for 16 hours. Water (25 mL) and dichloromethane (25 mL) were added to the reaction mixture and the crude residue was extracted into dichloromethane.
• Example 7 3-[(R)-2-(4-benzyl-phenoxymethyl)-pyrrolidin-1-yl]-propionic acid hydrochloride: To a solution of Example 7 (0.02 g, 0.05 mmol) was added 2N NaOH (0.04 mL, 0.08 mmol) and 80% MeOH/H 2 O (0.5 mL). The resulting slurry was stirred at 50° C. for 24 h. The solvent was removed under reduced pressure and water was added to the residue. The pH was adjusted to 4 using 1 N HCl solution. The crude product was extracted with ethyl acetate.
• step 2 4-(4-chloro-phenoxy)-phenol: Following the general procedure for Example 12 (step 2), boron tribromide (1.0 M solution in dichloromethane, 9.66 mL, 9.66 mmol) was added to the product from step 1 (0.76 g, 3.22 mmol) in dichloromethane (15 mL) to afford the title compound (0.37 g, 52%) as a light-green solid.
• 4-(4-Methoxy-phenoxy)-benzonitrile To a solution of 4-iodobenzonitrile (0.458 g, 2 mmol), 4-methoxyphenol (0.372 g, 3 mmol) and cesium carbonate (1.30 g, 4 mmol) in dioxane (4 mL) was added N,N-dimethylglycine hydrochloride (0.025 g, 0.18 mmol). The vessel was purged with nitrogen before Cu(I) iodide (0.014 g, 0.07 mmol) was added. The reaction mixture was heated to 90° C. overnight. The reaction mixture was diluted with water and ethyl acetate.
• step 2 4-(4-Hydroxy-phenoxy)-benzonitrile: Following the general procedure for Example 11 (step 2), boron tribromide (1.0 M solution in dichloromethane, 5.73 mL, 5.73 mmol) was added to the product from step 1 (0.43 g, 1.91 mmol) in dichloromethane (10 mL) to afford the title compound (0.30 g, 74%) as an off-white solid.
• step 4 (R)-2-[4-(4-Chloro-phenoxy)-phenoxymethyl]-pyrrolidine: Following the general procedure for Example 11 (step 4), the product from step 3 (3.60 g, 8.91 mmol) was treated with 4M HCl in dioxane (6 mL) to afford the title compound (2.56 g, 84%) as a white solid.
• (S)-2-[4-(4-trifluoromethyl-phenoxy)-phenoxymethyl]-pyrrolidine-1-yl ⁇ butylic ethyl ester (S)-2-[4-(4-trifluoromethyl-phenoxy)-phenoxymethyl]-pyrrolidine (340 mg, 1 mmol) was taken into DMF (4 mL), and 4-bromo-butylic acid ethyl ester (195 mg, 1.0 mmol) was added, followed by potassium carbonate (138 mg, 1.0 mmol). The mixture was heated to 60° C. overnight and then diluted with water, and extracted with EtOAc. The combined organic was washed with brine, dried over anhy.
• (S)-2-[4-(4-trifluoromethyl-phenoxy)-phenoxymethyl]-pyrrolidine-1-yl ⁇ butyric acid To a solution of (S)-2-[4-(4-trifluoromethyl-phenoxy)-phenoxymethyl]-pyrrolidine-1-yl ⁇ butyric acid ethyl ester (210 mg, 0.46 mmol) in methanol (4 mL) was added 1N NaOH (0.46 mL, 0.46 mmol) and the mixture was stirred at 60° C. for three hours. Water was added and the pH was adjusted to 5 using 1 N HCl. The desired product was extracted with EtOAc.
• 1-methoxy-4-(4-methylphenoxy)benzene 4-methoxy phenol (18 g, 0.145 mol) was taken into anhydrous dioxane (250 mL). 4-iodotoluene (47.42 g, 0.217 mol), cesium carbonate (94.49 g, 0.29 mol), N,N-dimethylglycine HCl (1.97 g, 0.014 mol), and copper iodide (0.966 g, 0.005 mol) were added to the solution. The reaction was heated to 90° C. for 12 h under nitrogen, with mechanical stirring. The reaction was concentrated to dryness and the residue was partitioned between water and ethyl acetate.
• (S)-2-(Toluene-4-sulfonyloxymethyl)-pyrrolidine-1-carboxylic acid tert-butyl ester (S)-2-Hydroxymethyl-pyrrolidine-1-carboxylic acid tert-butyl ester (10 g, 0.05 mol) was taken into anhydrous pyridine (51 mL). The reaction was cooled to 0° C. and p-toluenesulfonyl chloride (10.42 g, 0.055 mol) in anhydrous pyridine (25 mL) was added dropwise over 10 min. The reaction ran at 0° C. for 2 h. and then allowed to warm to room temperature overnight.
• the mixture was then partitioned between sodium bicarbonate (aq) and dichloromethane.
• the aqueous layer was washed with dichloromethane (3 ⁇ ).
• the combined organic layers were washed with brine, dried over sodium sulfate, and concentrated to dryness.
• the crude compound was purified by flash silica chromatography (40:1 silica ratio, eluted with 5% methanol in dichloromethane, followed by 10% methanol in dichloromethane).
• the pure product was then taken into 4M HCl in dioxane and left at room temperature for 3 h.
• the crude product was purified by flash silica chromatography (40:1 silica ration, eluted with 20% methanol in dichloromethane, with a wash consisting of 20% methanol, 1% ammonium hydroxide in dichloromethane) to obtain the title product (104 mg, 0.287 mmol, 71%).
• N-(3- ⁇ (S)-2-[4-(4-Chloro-phenoxy)-phenoxymethyl]-pyrrolidin-1-yl ⁇ -propyl)-methanesulfonamide HCl 3- ⁇ (S)-2-[4-(4-Chloro-phenoxy)-phenoxymethyl]-pyrrolidin-1-yl ⁇ -propylamine (50 mg, 0.139 mmol) and Diisopropylethyl amine (26.9 mg, 0.208 mmol) were taken into dichloromethane (2 ml). The reaction was cooled to ⁇ 10° C. and the sulfonyl chloride (0.013 mL, 0.166 mmol) was added dropwise over 5 minutes.
• the reaction was left to slowly warm to room temperature for 24 h.
• the mixture was then partitioned between sodium bicarbonate (aq) and dichloromethane.
• the aqueous layer was washed with dichloromethane (3 ⁇ ).
• the combined organic layers were washed with brine, dried over sodium sulfate, and concentrated to dryness.
• the crude compound was purified by flash silica chromatography (40:1 silica ratio, eluted with 2% methanol in dichloromethane, 5% methanol in dichloromethane, and 10% methanol in dichloromethane).
• the pure product was then taken into 4M HCl in dioxane and left to react at room temperature for 3 h.
• Phenyl-[4-((R)-1-pyrrolidin-2-ylmethoxy)-phenyl]-amine To the product from step 1 (155 mg, 0.421 mmol) was added 4M HCl in dioxane (6 mL) and the resulting mixture was stirred at rt for 2 h.
• the reaction mixture was warmed to rt and then heated at 90° C. for 15 h.
• the mixture was concentrated, diluted with saturated aq NaHCO 3 and extracted with ethyl acetate.
• the aqueous layer was re-extracted with ethylacetate.
• the combined organic layers were dried over anhy. MgSO 4 and the solvent was removed in vacuo to obtain the crude mixture, which was purified by silica gel flash chromatography to obtain the title product (256 mg, 64%); MS, m/z 370 (M+H) LCMS (UV)>90%.
• the reaction mixture was warmed to rt and then heated at 90° C. for 15 h.
• the mixture was concentrated, diluted with saturated aq NaHCO 3 and extracted with ethyl acetate.
• the aqueous layer was re-extracted with ethylacetate.
• the combined organic layers were dried over anhy. MgSO 4 and the solvent was removed in vacuo to obtain the crude mixture, which was purified by silica gel flash chromatography to obtain the title product (210 mg, 54%).
• Phenyl-[4-((R)-1-pyrrolidin-2-ylmethoxy)-phenyl]-methanone To the product from step 1 (70 mg, 0.183 mmol) was added 4M HCl in dioxane (6 mL) and the resulting mixture was stirred at rt for 3 h.
• (R)-2-(4-Phenoxy-phenoxymethyl)-piperidine hydrochloride A mixture of (R)-Hexahydro-[1,2,3]oxathiazolo[3,4-a]pyridine 1,1-dioxide (198 mg, 1.12 mmol), 4-phenoxyphenol (160 mg, 0.859 mmol), and potassium carbonate (237 mg, 1.72 mmol) in DMF (2 mL) at 50° C. was heated for 18 h and then at 65° C. for 7 h. The ambient mixture's pH was adjusted to 1 with an aqueous 20% H 2 SO 4 solution and stirred at ambient temperature for about 20 h.
• (R)-2-(4-Benzyl-phenoxymethyl)-piperidine hydrochloride A mixture of (R)-Hexahydro-[1,2,3]oxathiazolo[3,4-a]pyridine 1,1-dioxide (200 mg, 1.13 mmol), 4-hydroxydiphenyl methane (160 mg, 0.868 mmol), and potassium carbonate (240 mg, 1.74 mmol) in DMF (2 mL) at 50° C. was heated for 18 h and then at 65° C. for 7 h. The ambient mixture's pH was adjusted to 1 with an aqueous 20% H 2 SO 4 solution and stirred at ambient temperature for about 20 h.
• reaction solution's pH was adjusted to 12-14 with 5N NaOH, and extracted with EtOAc (20 mL). Aqueous layer was re-extracted with ethylacetate (10 mL). The organic layers were combined, dried over anhydrous Na 2 SO 4 , and concentrated to an oil.
• (S)-2-(4-Phenoxy-phenoxymethyl)-piperidine hydrochloride A mixture of (S)-Hexahydro-[1,2,3]oxathiazolo[3,4-a]pyridine 1,1-dioxide (198 mg, 1.12 mmol), 4-phenoxyphenol (160 mg, 0.86 mmol), and potassium carbonate (237 mg, 1.72 mmol) in DMF (2.5 mL) was heated for 18 h at 65° C. The ambient mixture's pH was adjusted to 1 with an aqueous 20% H 2 SO 4 solution and stirred at ambient temperature for about 20 h. The reaction solution's pH was adjusted to 12-14 with 5N NaOH, and extracted with EtOAc (2 ⁇ 18 mL).
• (4-iodophenyl)-(4-methoxyphenyl)-methane To a suspension of (4-iodophenyl)-4-(methoxyphenyl-methanone (26.7 g, 79 mmol) in trifluoroacetic acid (90 ml) was added triethylsilane (30 ml, 187 mmol, 2.37 eq.) dropwise by a syringe at 0° C. The mixture was allowed to warm to room temperature with stirring overnight. After the reaction was complete (monitored by TLC analysis), the volatile material was removed on a rotary evaporator.
• 4-(4-Thiophen-3-yl-benzyl)-phenol To a mixture of 4-(4-iodobenzyl)-phenol (12.4 g, 40 mmol), boronic acid (6.15 g, 48 mmol, 1.2 eq.), 10 wt. % Palladium on charcoal (2.12 g, 2 mmol, 0.05 eq.), potassium carbonate (16.6 g, 120 mmol, 3 eq.) was added isopropyl alcohol (200 ml) and water (40 ml). The mixture was bubbled with Ar for 10 min before it was stirred at 85° C. under Ar overnight.
• (R)-2-(Toluene-4-sulfonyloxymethyl)-pyrrolidine-1-carboxylic acid tert-butyl ester To a solution of (R)-2-hydroxymethyl-pyrrolidine-1-carboxylic acid tert-butyl ester (10.43 g, 52 mmol, 1 eq.) in pyridine (50 ml) was added p-toluenesulfonyl chloride (10.5 g, 55 mmol, 1.06 eq.) in one portion at 0° C. The resulting mixture was stirred at rt overnight. And then poured into ice-water (250 ml). The mixture was extracted with EtOAc (50 ml ⁇ 3).
• Succinic anhydride-d 4 To succinic acid-d 4 (1 g, 8.1 mmol, 1 eq.) in THF (200 ml) was added triethylamine (1.2 ml, 8.2 mmol, 1 eq.) followed by thiphosgene (260 mg, 1.2 mmol, 0.15 eq.). The resulting mixture was stirred at room temperature for 3 h. Then precipitate was filtered off and washed with ether. The combined organic solution was evaporated to dryness to give a residue. Thus obtained crude product was dissolved in THF (30 ml) and forward to the next step without further purification.
• (+/ ⁇ )-2-[(4-Benzylphenoxy)ethyl]-piperidine-1-carboxylic acid tert-butyl ester To a solution of (+/ ⁇ )-N-Boc-piperidine-2-ethanol (1.50 g, 6.54 mmol), 4-hydroxydiphenylmethane (1.33 g, 7.20 mmol), and triphenylphosphine (2.36 g, 8.99 mmol) in anhydrous tetrahydrofuran (75 mL) at 0° C. under an atmosphere of nitrogen was added diisopropyl azodicarboxylate (1.74 ml, 8.99 mmol), and the resulting mixture was stirred at ambient temperature for about 20 h.
• (+/ ⁇ )-2-[(4-Benzylphenoxy)ethyl]-piperidine hydrochloride A solution of the product (0.951 g, 2.40 mmol) in step 1 in 4N HCl in dioxane (6.0 mL) was stirred at ambient temperature for about 40 min and then concentrated in vacuo. The residue was triturated with ether and dried in a 55° C.
• Hexahydro-[1,2,3]oxathiazolo[3,4-a]pyridine 1,1-dioxide To a 0° C. solution of the product (0.300, 1.86 mmol) in step 1 in anhydrous acetonitrile (4.6 mL) was added sodium (meta)periodate (0.436 g, 2.04 mmol), followed by ruthenium(III) chloride hydrate (3.90 mg, 0.0186 mmol), and then H 2 O (4.6 mL). The mixture was stirred at 0° C. for 5 min and at ambient temperature for 10 min, then diluted with saturated NaHCO3 (20 mL) and dichloromethane (20 mL).
• Hexahydro-[1,2,3]oxathiazolo[3,4-a]pyridine 1,1-dioxide To a ⁇ 78° C. hazy solution under a nitrogen atmosphere of racemic 2-piperidinemethanol (0.576 g, 5.00 mmol) and triethylamine (1.42 mL, 10.0 mmol) in anhydrous dichloromethane (30 mL) was added a solution of sulfuryl chloride (0.41 mL, 5.06 mmol) in anhydrous dichloromethane (30 mL) and the reaction was stirred for around 18 h from ⁇ 78° C. to ambient temperature.
• (+/ ⁇ )-2-[(4-Benzylphenoxy)methyl]-piperidine A solution of 1,1-dioxo-2-oxa-1-thia-7a-azaperhydronoindene (0.300 g, 1.69 mmol), 4-hydroxydiphenylmethane (0.311 g, 1.69 mmol), and potassium carbonate (0.467 g, 3.38 mmol) in DMF (3.38 mL) at 40° C. under an atmosphere of nitrogen was heated for 18 h and then at 60° C. for 3.5 h. The ambient mixture's pH was adjusted to 1 with an aqueous 20% H 2 SO 4 solution and stirred at ambient temperature for about 20 h.
• (+/ ⁇ )-2-[(4-Benzylphenoxy)methyl]-piperidine hydrochloride A mixture of the product (0.090 g, 0.320 mmol) in step 1 in 4N HCl in dioxane was stirred for 5 min at ambient temperature and then diluted with ether.
• (+/ ⁇ )-2-[(4-phenoxyphenoxy)methyl]-piperidine hydrochloride A solution of 1,1-dioxo-2-oxa-1-thia-7a-azaperhydronoindene (0.400 g, 2.26 mmol), 4-phenoxyphenol (0.315 g, 1.69 mmol), and potassium carbonate (0.467 g, 3.38 mmol) in DMF (3.38 mL) at 40° C. under an atmosphere of nitrogen was heated for 18 h and then at 66° C. for 3.5 h. The ambient mixture's pH was adjusted to 1 with an aqueous 20% H 2 SO 4 solution and stirred at ambient temperature for about 20 h.
• reaction solution's pH was adjusted to 14 with 5N NaOH, diluted with H 2 O (20 mL), and extracted with EtOAc (3 ⁇ 10 mL). The organic layer was washed with H 2 O (2 ⁇ 10 mL), brine (10 mL), dried over anhydrous Na 2 SO 4 , and concentrated to an oil.
• 3-(4-Phenoxymethyl)-piperazine dihydrochloride A mixture of 1-Benzyl-3-(4-phenoxymethyl)-piperazine dihydrochloride (0.190, 0.427 mmol) and palladium hydroxide on activated carbon (19 mg) in anhydrous MeOH (3 mL) was hydrogenated at ambient temperature at 60 psi for 24 h. The mixture was filtered through a celite bed, and the filtrate was concentrated in vacuo to a tan solid.
• 3-(4-(4-Methoxy-benzyl)-phenyl]-thiophene To a mixture of 1-(4-iodobenzyl)-4-methoxybenzene (0.300 g, 0.925 mmol), 2N aqueous NaHCO 3 solution (1.85 mL, 3.7 mmol), and 3-thiopheneboronic acid (0.237 g, 1.85 mmol) in a solution of toluene/EtOH (17.6/0.8 mL) at ambient temperature under an atmosphere of nitrogen was added tetrakis(triphenylphosphine)palladium(0) (0.107 g, 0.093 mmol).
• (2S,4R)-4-Benzyloxy-2-hydroxymethyl-pyrrolidine-1-carboxylic acid tert-butyl ester (2S,4R)-4-Benzyloxy-pyrrolidine-1,2-dicarboxylic acid 1-tert-butyl ester (960 mg, 3 mmol) in THF (5 mL) was cooled to 0° C. using ice-water bath. Then 1M solution of BH3 (6 mL, 6 mmol) in THF was added under nitrogen over period of 30 min. Reaction was stirred at 0° C. for 2 h and at rt for another 1 h. Reaction mixture was poured over ice water and product was extracted with EtOAc. Organic layers were combined, washed with water, brine, saturated sodium bicarbonate, dried over anhydrous MgSO4 and concentrated to give the crude product. It was used in next step without purification (900 mg, 97%).
• (2S,4R)-4-Benzyloxy-2-(4-phenoxy-phenoxymethyl)-pyrrolidine-1-carboxylic acid tert-butyl ester To a solution of (2S,4R)-4-benzyloxy-2-hydroxymethyl-pyrrolidine-1-carboxylic acid tert-butyl ester (900 mg, 2.93 mmol) in anhydrous THF (2 mL) was added 4-phenoxyphenyl (655 mg, 3.52 mmol) in THF (2 mL) and triphenyl phosphine (997 mg, 3.8 mmol) in THF (1 mL). The resulting mixture was cooled to 0° C. using ice-water bath and purged with nitrogen.
• Diisopropyl azodicarboxylate (770 mg, 3.8 mmol) was dissolved in 3 mL of THF and added to above solution dropwise over a period of 20 min under nitrogen. Reaction then was heated at 70° C. for 16 h. THF was removed in vacuo and crude mixture was purified by silica gel flash chromatography (10% EtOAc/hexanes) to obtain the product. To a solution of the product (100 mg, 0.21 mmol) in dioxane (1 mL) was added 4M HCl in dioxane (5 mL) at rt and the resulting mixture was stirred for 2 h at that temperature. The solvent was removed in vacuo to obtain thick oil.
• (2S,4R)-4-Benzyloxy-2-hydroxymethyl-pyrrolidine-1-carboxylic acid tert-butyl ester (2S,4R)-4-Benzyloxy-pyrrolidine-1,2-dicarboxylic acid 1-tert-butyl ester (960 mg, 3 mmol) in THF (5 mL) was cooled to 0° C. using ice-water bath. Then 1M solution of BH3 (6 mL, 6 mmol) in THF was added under nitrogen over period of 30 min. Reaction was stirred at 0° C. for 2 h and at rt for another 1 h. Reaction mixture was poured over ice water and product was extracted with EtOAc.
• 2S,4R)-4-Hydroxy-2-(4-phenoxy-phenoxymethyl)-pyrrolidine-1-carboxylic acid tert-butyl ester To a solution of (2S,4R)-4-benzyloxy-2-hydroxymethyl-pyrrolidine-1-carboxylic acid tert-butyl ester (900 mg, 2.93 mmol) in anhydrous THF (2 mL) was added 4-phenoxyphenyl (655 mg, 3.52 mmol) in THF (2 mL) and triphenyl phosphine (997 mg, 3.8 mmol) in THF (1 mL). The resulting mixture was cooled to 0° C. using ice-water bath and purged with nitrogen.
• Diisopropyl azodicarboxylate (770 mg, 3.8 mmol) was dissolved in 3 mL of THF and added to above solution dropwise over a period of 20 min under nitrogen. Reaction then was heated at 70° C. for 16 h. THF was removed in vacuo and crude mixture was purified by silica gel flash chromatography (10% EtOAc/Hexane) to obtain the product.
• 3-(4-Benzyloxy-phenyl)-pyridine To a solution of 4-benzyloxyphenylboronic acid (1.48 g, 6.5 mmol) in DME (10 mL) was added 3-iodo pyridine (1.03 g, 5.0 mmol) in DME (8 mL), potassium carbonate (2.0 g, 15 mmol) in 1:1 mixture of EtOH:water (3 mL), palladium(II) acetate (56 mg, 0.25 mmol), and triphenyl phosphine (202 mg, 1.0 mmol) in DME (2 mL). The resulting mixture was warmed up to) 90° C. and stirred for 16 h at that temperature.
• reaction mixture was poured into ice-water (200 mL) and product was extracted with EtOAc, washed with brine, filtered through pad of Celite and concentrated to a yellow solid.
• the crude mixture was purified by silica gel flash chromatography (20% EtOAc/Hexane) to obtain the title product as yellow solid (1.2 g, 92%).
• the vessel was purged with nitrogen for 15 min before N,N-dimethylglycine hydrochloride (9 mg, 0.06 mmol) in dioxane (0.5 mL) and Cu(I) iodide (4 mg, 0.02 mmol) were added.
• the resulted mixture was stirred at 90° C. for 48 h. It was then diluted with EtOAc and water, organic layer was separated washed with water, brine, dried over hydrous MgSO4 and concentrated in vacuo to yellow oil.
• the crude mixture was purified by silica gel flash chromatography (15%; EtOAc/Hexane) to obtain the title product as yellow oil (142 mg, 48%).
• the vessel was purged with nitrogen for 15 min before N,N-dimethylglycine hydrochloride (12.5 mg, 0.09 mmol) in dioxane (1 mL) and Cu(I) iodide (6 mg, 0.03 mmol) were added.
• the resulted mixture was stirred at 85° C. for 16 h. It was then diluted with EtOAc and water, organic layer was separated, washed with water, brine, dried over anhydrous MgSO4 and concentrated in vacuo to yellow oil.
• the crude mixture was purified by silica gel flash chromatography (10% EtOAc/Hexane) before treating it with 4M HCl in dioxane (5 mL) at rt for 1 h. Solvent was removed in vacuo, residue was triturated with ether and dried under vacuum to give the title product as white solid (280 mg, 75%).
• the vessel was purged with nitrogen for 15 min before N,N-dimethylglycine hydrochloride (12.5 mg, 0.09 mmol) in dioxane (1 mL) and Cu(I) iodide (6 mg, 0.03 mmol) were added.
• the resulted mixture was stirred at 85° C. for 16 h. It was then diluted with EtOAc and water, organic layer was separated washed with water, brine, dried over anhydrous MgSO4 and concentrated in vacuo to dark brownish oil.
• the crude mixture was purified by silica gel flash chromatography (10 EtOAc/Hexane) before treating it with 4M HCl in dioxane (5 mL) at rt 1 h.
• 4-Benzothiazol-2-ylmethyl-phenol To a 50 mL press resistant vial which contained 2-amino-benzenethiol (1252 mg, 10 mmol) was added 4-(hydroxy-phenyl)-acetic acid (1522 mg, 10 mmol) at rt. The tube was sealed and the mixture was heated to 150° C. and stirred at 150° C. for 16 h. After cooling to it, the mixture was poured onto 100 mL EtOAc and then washed with aq. HCl (2N, 2 ⁇ 30 mL), water (2 ⁇ 50 mL) and brine (50 mL) and dried over anhy. Na 2 SO 4 .
• the tube was sealed and the mixture was allowed to warm to rt and stir at rt for 30 min and then was heated to 98° C. and stirred at 98° C. for 16 h. After cooling to rt, the mixture was poured onto 200 mL ice-water solution and then extracted with EtOAc (3 ⁇ 30 mL). The combined organic layers were washed with water (2 ⁇ 30 mL) and brine (20 mL) and dried over anhy. Na 2 SO 4 .

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