Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D495/00—Heterocyclic compounds containing in the condensed system at least one hetero ring having sulfur atoms as the only ring hetero atoms
  • C07D495/02—Heterocyclic compounds containing in the condensed system at least one hetero ring having sulfur atoms as the only ring hetero atoms in which the condensed system contains two hetero rings
  • C07D495/04—Ortho-condensed systems
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
  • A61P1/02—Stomatological preparations, e.g. drugs for caries, aphtae, periodontitis
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P19/00—Drugs for skeletal disorders
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P19/00—Drugs for skeletal disorders
  • A61P19/02—Drugs for skeletal disorders for joint disorders, e.g. arthritis, arthrosis
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P19/00—Drugs for skeletal disorders
  • A61P19/08—Drugs for skeletal disorders for bone diseases, e.g. rachitism, Paget's disease
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P19/00—Drugs for skeletal disorders
  • A61P19/08—Drugs for skeletal disorders for bone diseases, e.g. rachitism, Paget's disease
  • A61P19/10—Drugs for skeletal disorders for bone diseases, e.g. rachitism, Paget's disease for osteoporosis
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00

Definitions

• This invention relates to a novel 4-amino-azepan-3-one protease inhibitor.
• This compound is particularly an inhibitor of cysteine and serine proteases, more particularly an inhibitor of cysteine proteases.
• the compound of this invention even more particularly inhibits cysteine proteases of the papain superfamily, and yet more particularly cysteine proteases of the cathepsin family.
• this invention relates to a compound which inhibits cathepsin K.
• Such compound is particularly useful for treating diseases in which cysteine proteases are implicated, especially diseases of excessive bone or cartilage loss, e.g., osteoporosis, periodontitis, and arthritis.
• Cathepsin K is a member of the family of enzymes which are part of the papain superfamily of cysteine proteases. Cathepsins B, H, L, N and S have been described in the literature. Recently, cathepsin K polypeptide and the cDNA encoding such polypeptide were disclosed in U.S. Patent No. 5,501,969 (called cathepsin O therein). Cathepsin K has been recently expressed, purified, and characterized. Bossard, M. J., et al., (1996) J. Biol. Chem. 271, 12517-12524; Drake, F.H., et al., (1996) J. Biol. Chem. 271, 12511-12516; Bromme, D., et al., (1996) J. Biol. Chem. 271, 2126-2132.
• Cathepsin K has been variously denoted as cathepsin O, cathepsin X or cathepsin 02 in the literature.
• the designation cathepsin K is considered to be the more appropriate one (name assigned by Nomenclature Committee of the International Union of Biochemistry and Molecular Biology).
• Cathepsins of the papain superfamily of cysteine proteases function in the normal physiological process of protein degradation in animals, including humans, e.g., in the degradation of connective tissue. However, elevated levels of these enzymes in the body can result in pathological conditions leading to disease.
• cathepsins have been implicated in various disease states, including but not limited to, infections by pneumocystis carinii, trypsanoma cruzi, trypsanoma brucei brucei, and Crithidia fusiculata; as well as in schistosomiasis malaria, tumor metastasis, metachromatic leukodystrophy, muscular dystrophy, amytrophy, and the like. See International Publication Number WO 94/04172, published on March 3, 1994, and references cited therein.
• Bone is composed of a protein matrix in which spindle- or plate-shaped crystals of hydroxyapatite are incorporated
• Type I Collagen represents the major structural protein of bone comprising approximately 90% of the structural protein
• the remaining 10% of matrix is composed of a number of non-collagenous proteins, including osteocalcin, proteoglycans, osteopontin, osteonectin, thrombospondin, fibronectin, and bone sialoprotein Skeletal bone undergoes remodeling at discrete foci throughout life These foci, or remodeling units, undergo a cycle consisting of a bone re
• Bone resorption is earned out by osteoclasts, which are multinuclear cells of hematopoietic lineage
• the osteoclasts adhere to the bone surface and form a tight sealing zone, followed by extensive membrane ruffling on their apical (l e , resorbing) surface
• the low pH of the compartment dissolves hydroxyapatite crystals at the bone surface, while the proteolytic enzymes digest the protein matrix In this way, a resorption lacuna, or pit, is formed
• osteoblasts lay down a new protein matrix that is subsequently mineralized
• several disease states such as osteoporosis and Paget' s disease
• a certain novel compound is a protease inhibitor, most particularly an inhibitor of cathepsin K, and that this compound is useful for treating diseases characterized by bone loss, such as osteoporosis and gingival diseases, such as gingivitis and periodontitis, or by excessive cartilage or matrix degradation, such as osteoarthritis and rheumatoid arthritis.
• An object of the present invention is to provide a 4-amino-azepan-3-one protease inhibitor, particularly an inhibitor of cysteine and serine proteases. More particularly, the present invention relates to such a compound which inhibits cysteine proteases, and yet more particularly cysteine proteases of the papain superfamily. Preferably, this invention relates to such a compound which inhibits cysteine proteases of the cathepsin family and most preferably, a compound which inhibits cathepsin K. The compound of the present invention is useful for treating diseases which may be therapeutically modified by altering the activity of such proteases.
• this invention provides a compound, thieno[3,2- b]thiophene-2-carboxylic acid ⁇ (S)-3-methyl-l-[3-oxo-l-(pyridine-2-sulfonyl)-azepan-4- ylcarbamoyl]-butyl ⁇ amide, according to Formula I:
• this invention provides a pharmaceutical composition comprising a compound according to Formula I and a pharmaceutically acceptable carrier.
• this invention provides a method of treating diseases in which the disease pathology may be therapeutically modified by inhibiting proteases, such as cysteine and serine proteases.
• the method includes treating diseases by inhibiting cysteine proteases, and particularly cysteine proteases of the papain superfamily. More particularly, the inhibition of cysteine proteases of the cathepsin family, such as cathepsin K is described.
• the compound of this invention is especially useful for treating diseases characterized by bone loss, such as osteoporosis, and gingival diseases, such as gingivitis and periodontitis, or by excessive cartilage or matrix degradation, such as osteoarthritis and rheumatoid arthritis.
• diseases characterized by bone loss such as osteoporosis, and gingival diseases, such as gingivitis and periodontitis, or by excessive cartilage or matrix degradation, such as osteoarthritis and rheumatoid arthritis.
• the present invention provides a compound, thieno[3,2-b]thiophene-2-carboxylic acid ⁇ (S)-3-methyl- 1 -[3-oxo- 1 -(pyridine-2-sulfonyl)-azepan-4-ylcarbamoyl]-butyl ⁇ amide, of Formula (I):
• the present invention includes all hydrates, solvates, complexes, polymorphs and prodrugs of the compound of Formula (I).
• Prodrugs are any covalently bonded compounds which release the active parent drug according to Formula (I) in vivo.
• Prodrugs of the compound of the present invention include ketone derivatives, specifically ketals or hemiketals.
• inventive compound may be used as a racemic mixture, an enantiomerically enriched mixture, or the racemic mixture may be separated using well-known techniques and an individual enantiomer may be used alone.
• each tautomeric form is contemplated as being included within this invention whether existing in equilibrium or predominantly in one form.
• the 7 membered ring compound of the present invention is configurationally more stable at the carbon center alpha to the ketone.
• m- CPBA means e. ⁇ -chloroperoxybenzoic acid
• Boc means fe/t-butoxycarbonyl
• EDC means l-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride
• DMSO means methyl sulfoxide
• TEA means triethylamine.
• the compound of the Formula (I) is generally prepared according to Scheme 1.
• the individual diastereomers of thieno[3,2-b]thiophene-2-carboxylic acid ⁇ (S)-3-methyl-l- [3-oxo-l-(pyridine-2-sulfonyl)-azepan-4-ylcarbamoyl]-butyl ⁇ amide 10 and 11 may be prepared as outlined in Scheme 1. Alkylation of allyl-carbamic acid benzyl ester (1) with 5-bromo- 1 -pentene in the presence of a base such as sodium hydride provides the diene 2.
• Reagents and Conditions a.) NaH, 5-bromo- 1 -pentene, DMF; b.) bis(tricyclohexylphosphine)benzylidine ruthenium (IV) dichloride, CH,C1 2 ; c.) r ⁇ -CPBA, CH 2 C1 2 ; d.) NaN 3 , CH,OH, H 2 0, NH.C1; e.) 1,3-propanedithiol, TEA, methanol; f.) N-Boc-leucine, EDC, CH 2 C1 2 ; g.) 10% Pd/C, H 2 ; h.) 2-pyridinesulphonyl chloride, TEA, CH,C1,; i.) 4 N HCl/dioxane, methanol; j.) thieno[3,2-b]thiophene-2-carboxylic acid, EDC, CH Cl ; k.) pyridine sulfur
• Coupling of 7 with thieno[3,2-b]thiophene-2-carboxylic acid may be effected with a coupling agent such as EDC to provide intermediate alcohol 8.
• Alcohol 8 may be oxidized with an oxidant such as pyridine sulfur trioxide complex in DMSO and triethylamine to provide the ketone 9 as a mixture of diastereomers.
• the diastereomers 9 may be separated by HPLC to provide compounds 10 and 11.
• Coupling methods to form amide bonds herein are generally well-known in the art.
• the methods of peptide synthesis generally set forth by Bodansky et al., THE PRACTICE OF PEPTIDE SYNTHESIS, Springer- Verlag, Berlin, 1984; E. Gross and J. Meienhofer, THE PEPTIDES, Vol. 1, 1-284 (1979); and J.M. Stewart and J.D. Young, SOLID PHASE PEPTIDE SYNTHESIS, 2d Ed., Pierce Chemical Co., Rockford, 111., 1984, are generally illustrative of the technique and are incorporated herein by reference.
• amino protecting groups generally refers to the Boc, acetyl, benzoyl, Fmoc and Cbz groups and derivatives thereof as known to the art. Methods for protection and deprotection, and replacement of an amino protecting group with another moiety are well known.
• Acid addition salts of the compound of Formula (I) are prepared in a standard manner in a suitable solvent from the parent compound and an excess of an acid, such as hydrochloric, hydrobromic, hydrofluoric, sulfu ⁇ c, phospho ⁇ c, acetic, t ⁇ fluoroacetic, maleic, succi c or methanesulfonic acid.
• an acid such as hydrochloric, hydrobromic, hydrofluoric, sulfu ⁇ c, phospho ⁇ c, acetic, t ⁇ fluoroacetic, maleic, succi c or methanesulfonic acid.
• the present invention also provides a novel intermediate, th ⁇ eno[3,2-b]th ⁇ ophene-2- carboxy lie acid ⁇ (S)-3-methyl- 1 -[3-hydroxy- 1 -(py ⁇ d ⁇ ne-2-sulfonyl)-azepan-4- ylcarbamoyl]-butyl ⁇ amide (8-Scheme-l), of Formula (II), useful in the synthesis of the compound of Formula (I) according to Scheme 1
• the present invention provides a process for the synthesis of compounds of Formula (I) comprising the step of oxidizing the appropriate compound of Formula (II) with an oxidant to provide the compound of Formula (I) as a mixture of diastereomers.
• the oxidant is sulfur trioxide pyndine complex in DMSO and triethylamine
• the process further comprises the step of separating the diasteromers of Formula (I) by separating means, preferably by high presssure liquid chromatography (HPLC)
• This invention also provides a pharmaceutical composition which compnses a compound according to Formula (I) and a pharmaceutically acceptable earner, excipient or diluent
• the compound of Formula (I) may be used in the manufacture of a medicament
• Pharmaceutical compositions of the compound of Formula (I) prepared as hereinbefore described may be formulated as solutions or lyophihzed powders for parenteral administration Powders may be reconstituted by addition of a suitable diluent or other pharmaceutically acceptable carrier pnor to use
• the liquid formulation may be a buffered, isotonic, aqueous solution.
• Suitable diluents are normal isotonic saline solution, standard 5% dextrose in water, or buffered sodium or ammonium acetate solution.
• Such formulation is especially suitable for parenteral administration, but may also be used for oral administration or contained in a metered dose inhaler or nebulizer for insufflation. It may be desirable to add excipients such as polyvinylpyrrolidone, gelatin, hydroxy cellulose, acacia, polyethylene glycol, mannitol, sodium chloride, or sodium citrate.
• this compound may be encapsulated, tableted, or prepared in an emulsion or syrup for oral administration.
• Pharmaceutically acceptable solid or liquid carriers may be added to enhance or stabilize the composition, or to facilitate preparation of the composition.
• Solid carriers include starch, lactose, calcium sulfate dihydrate, terra alba, magnesium stearate or stearic acid, talc, pectin, acacia, agar or gelatin.
• Liquid carriers include syrup, peanut oil, olive oil, saline and water.
• the carrier may also include a sustained release material such as glyceryl monostearate or glyceryl distearate, alone or with a wax.
• the amount of solid carrier varies but, preferably, will be between about 20 mg to about 1 g per dosage unit.
• the pharmaceutical preparations are made following the conventional techniques of pharmacy involving milling, mixing, granulating, and compressing, when necessary, for tablet forms; or milling, mixing and filling for hard gelatin capsule forms.
• a liquid carrier When a liquid carrier is used, the preparation will be in the form of a syrup, elixir, emulsion or an aqueous or non-aqueous suspension. Such a liquid formulation may be administered directly or filled into a soft gelatin capsule.
• the compound of this invention may also be combined with excipients such as cocoa butter, glycerin, gelatin or polyethylene glycols and molded into a suppository.
• the compound of Formula (I) is useful as a protease inhibitor, particularly as an inhibitor of cysteine and serine proteases, more particularly as an inhibitor of cysteine proteases, even more particularly as an inhibitor of cysteine proteases of the papain superfamily, yet more particularly as an inhibitor of cysteine proteases of the cathepsin family, most particularly as an inhibitor of cathepsin K.
• the present invention also provides useful compositions and formulations of said compound, including pharmaceutical compositions and formulations of said compound.
• the present compound is useful for treating diseases in which cysteine proteases are implicated, including infections by pneumocystis carinii, trypsanoma cruzi, trypsanoma brucei, and Crithidia fusiculata; as well as in schistosomiasis, malaria, tumor metastasis, metachromatic leukodystrophy, muscular dystrophy, amytrophy; and especially diseases in which cathepsin K is implicated, most particularly diseases of excessive bone or cartilage loss, including osteoporosis, gingival disease including gingivitis and periodontitis, arthritis, more specifically, osteoarthritis and rheumatoid arthritis, Paget's disease; hypercalcemia of malignancy, and metabolic bone disease.
• Metastatic neoplastic cells also typically express high levels of proteolytic enzymes that degrade the surrounding matrix, and certain tumors and metastatic neoplasias may be effectively treated with the compound of this invention.
• the present invention also provides methods of treatment of diseases caused by pathological levels of proteases, particularly cysteine and serine proteases, more particularly cysteine proteases, even more particularly cysteine proteases of the papain superfamily, yet more particularly cysteine proteases of the cathepsin family, which methods comprise administering to an animal, particularly a mammal, most particularly a human in need thereof the compound of the present invention.
• the present invention especially provides methods of treatment of diseases caused by pathological levels of cathepsin K, which methods comprise administering to an animal, particularly a mammal, most particularly a human in need thereof, an inhibitor of cathepsin K, including the compound of the present invention.
• the present invention particularly provides methods for treating diseases in which cysteine proteases are implicated, including infections by pneumocystis carinii, trypsanoma cruzi, trypsanoma brucei, and Crithidia fusiculata; as well as in schistosomiasis, malaria, tumor metastasis, metachromatic leukodystrophy, muscular dystrophy, amytrophy, and especially diseases in which cathepsin K is implicated, most particularly diseases of excessive bone or cartilage loss, including osteoporosis, gingival disease including gingivitis and periodontitis, arthritis, more specifically, osteoarthritis and rheumatoid arthritis, Paget's disease, hypercalcemia of malignancy, and metabolic bone disease.
• diseases in which cysteine proteases are implicated, including infections by pneumocystis carinii, trypsanoma cruzi, trypsanoma brucei, and Crithidia fusiculata;
• This invention further provides a method for treating osteoporosis or inhibiting bone loss which comprises internal administration to a patient of an effective amount of the compound of Formula (I), alone or in combination with other inhibitors of bone resorption, such as bisphosphonates (i.e., allendronate), hormone replacement therapy, anti-estrogens, or calcitonin.
• an anabolic agent such as bone morphogenic protein, iproflavone, may be used to prevent bone loss or to increase bone mass.
• an effective amount of the compound of Formula (I) is administered to inhibit the protease implicated in a particular condition or disease
• this dosage amount will further be modified according to the type of administration of the compound
• parenteral administration of the compound of Formula (I) is preferred
• the parenteral dose will be about 0 01 to about 100 mg/kg, preferably between 0 1 and 20 mg/kg, in a manner to maintain the concentration of drug in the plasma at a concentration effective to inhibit cathepsin K
• the compound is administered one to four times daily at a level to achieve a total daily dose of about 0 4 to about 400 mg/kg/day
• the precise amount of the inventive compound which is therapeutically effective, and the route by which such compound is best administered, is readily determined by one of ordinary skill in the
• Prodrugs of the compound of the present invention may be prepared by any suitable method Where the prodrug moiety is a ketone functionality, specifically ketals and/or hemiacetals, the conversion may be effected in accordance with conventional methods
• the compound of this invention may also be administered orally to the patient, in a manner such that the concentration of drug is sufficient to inhibit bone resorption or to achieve any other therapeutic indication as disclosed herein
• a pharmaceutical composition containing the compound is administered at an oral dose of between about 0 1 to about 50 mg/kg in a manner consistent with the condition of the patient
• the oral dose would be about 0 5 to about 20 mg/kg No unacceptable toxicological effects are expected when compounds of the present invention are administered in accordance with the present invention
• the compound of this invention may be tested in one of several biological assays to determine the concentration of the compound which is required to have a given pharmacological effect Determination of cathepsin K proteolytic catalytic activity
• v is the velocity of the reaction with maximal velocity V m
• A is the concentration of substrate with Michaelis constant of K a
• / is the concentration of inhibitor
• [AMC] v ss t + (vo - v ss ) [1 - exp (-k 0 b s t)J / k ⁇ bs (2)
• [AMC] is the concentration of product formed over time t
• v ⁇ is the initial reaction velocity
• v ss is the final steady state rate.
• Values for k ODS were then analyzed as a linear function of inhibitor concentration to generate an apparent second order rate constant (k 0 bs / inhibitor concentration or k OD s / [I]) describing the time-dependent inhibition.
• the compounds used in the method of the present invention have a Kj value of less than 1 micromolar. Most preferably, said compounds have a Kj value of less than 100 nanomolar.
• the cells were washed x2 with cold RPMI-1640 by centrifugation (1000 rpm, 5 min at 4°C) and then transferred to a sterile 15 mL centrifuge tube. The number of mononuclear cells were enumerated in an improved Neubauer counting chamber.
• Sufficient magnetic beads (5 / mononuclear cell), coated with goat anti-mouse IgG, were removed from their stock bottle and placed into 5 mL of fresh medium (this washes away the toxic azide preservative). The medium was removed by immobilizing the beads on a magnet and is replaced with fresh medium. The beads were mixed with the cells and the suspension was incubated for 30 minutes on ice. The suspension was mixed frequently. The bead-coated cells were immobilized on a magnet and the remaining cells (osteoclast-rich fraction) were decanted into a sterile 50 mL centrifuge tube. Fresh medium was added to the bead-coated cells to dislodge any trapped osteoclasts. This wash process was repeated lO. The bead-coated cells were discarded.
• the osteoclasts were enumerated in a counting chamber, using a large-bore disposable plastic pasteur pipette to charge the chamber with the sample.
• the cells were pelleted by centrifugation and the density of osteoclasts adjusted to 1.5xl0 ⁇ /mL in EMEM medium, supplemented with 10% fetal calf serum and 1 7g/l ⁇ tre of sodium bicarbonate 3 mL a quots of the cell suspension ( per treatment) were decanted into 15 mL centnfuge tubes These cells were pelleted by centnfugation To each tube 3 mL of the appropriate treatment was added (diluted to 50 ⁇ M in the EMEM medium) Also included were appropriate vehicle controls, a positive control (87MEM1 diluted to 100 ug/mL) and an isotype control (IgG2a diluted to 100 ug/mL) The tubes were incubated at 37°C for 30 minutes
• the TRAP positive osteoclasts were enumerated by bright-field microscopy and were then removed from the surface of the dentine by sonication Pit volumes were determined using the Nikon/Lasertec ILM21W confocal microscope

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