WO2011005738A1 - Bace inhibitors - Google Patents
Bace inhibitors Download PDFInfo
- Publication number
- WO2011005738A1 WO2011005738A1 PCT/US2010/041034 US2010041034W WO2011005738A1 WO 2011005738 A1 WO2011005738 A1 WO 2011005738A1 US 2010041034 W US2010041034 W US 2010041034W WO 2011005738 A1 WO2011005738 A1 WO 2011005738A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mmol
- compound
- mixture
- thiazin
- pharmaceutically acceptable
- Prior art date
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- 238000000034 method Methods 0.000 claims abstract description 32
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- LWIHDJKSTIGBAC-UHFFFAOYSA-K tripotassium phosphate Chemical compound [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 description 1
- RMNIZOOYFMNEJJ-UHFFFAOYSA-K tripotassium;phosphate;hydrate Chemical compound O.[K+].[K+].[K+].[O-]P([O-])([O-])=O RMNIZOOYFMNEJJ-UHFFFAOYSA-K 0.000 description 1
- GPRLSGONYQIRFK-MNYXATJNSA-N triton Chemical compound [3H+] GPRLSGONYQIRFK-MNYXATJNSA-N 0.000 description 1
- 230000002792 vascular Effects 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D513/00—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for in groups C07D463/00, C07D477/00 or C07D499/00 - C07D507/00
- C07D513/02—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for in groups C07D463/00, C07D477/00 or C07D499/00 - C07D507/00 in which the condensed system contains two hetero rings
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/33—Heterocyclic compounds
- A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
- A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
- A61K31/496—Non-condensed piperazines containing further heterocyclic rings, e.g. rifampin, thiothixene or sparfloxacin
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P25/00—Drugs for disorders of the nervous system
- A61P25/28—Drugs for disorders of the nervous system for treating neurodegenerative disorders of the central nervous system, e.g. nootropic agents, cognition enhancers, drugs for treating Alzheimer's disease or other forms of dementia
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D279/00—Heterocyclic compounds containing six-membered rings having one nitrogen atom and one sulfur atom as the only ring hetero atoms
- C07D279/04—1,3-Thiazines; Hydrogenated 1,3-thiazines
- C07D279/08—1,3-Thiazines; Hydrogenated 1,3-thiazines condensed with carbocyclic rings or ring systems
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D498/00—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and oxygen atoms as the only ring hetero atoms
- C07D498/02—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and oxygen atoms as the only ring hetero atoms in which the condensed system contains two hetero rings
- C07D498/04—Ortho-condensed systems
Definitions
- the present invention is in the field of treatment of Alzheimer's disease and other diseases and disorders involving amyloid ⁇ (A ⁇ ) peptide, a neurotoxic and highly aggregatory peptide segment of amyloid precursor protein (APP).
- a ⁇ amyloid ⁇
- APP amyloid precursor protein
- BACE ⁇ -secretase or ⁇ -site amyloid precursor protein-cleaving enzyme
- BACE inhibitors are peptidomimetic transition state analogs, typically containing a hydroxy ethyl moiety. Although many of these compounds are potent inhibitors of BACE, their high molecular weights and low membrane permeability make them poor drug candidates. See Park and Lee, Journal of the American Chemical Society, 125(52), 16416-16422 (2003). There has been a progression from large peptidomimetic molecules to small molecules, such as a variety of hydroxy ethylamine scaffolds as well as heterocyclic-containing scaffolds. See e.g., Durham and Shepherd, Current Opinion in Drug Discovery & Development, 9(6), 776-791 (2006). Certain aminothiazine compounds have been described as BACE inhibitors in WO 2007/049532, WO 2008/133273, and WO 2008/133274.
- BACE inhibitors that are potent and more efficacious are necessary to provide treatments for A ⁇ peptide-mediated disorders, such as Alzheimer's disease.
- the present invention provides new potent and efficacious inhibitors of BACE.
- the present invention provides compounds of Formula I:
- X is -CH 2 - or -O-;
- n 0 or 1 ;
- n 0, 1, or 2;
- p is 0 or 1 ; p must be 0 when X is -O-;
- R 1 is -NHCOR 4 , pyrimidinyl, pyridinyl optionally substituted with halo or phenyl optionally monosubstituted with -C 1 -C 3 alkoxy;
- R 2 is halo
- R 3 is -Ci -C 3 alkoxy, hydroxy, or -0-CH 2 -O-CH 3 ;
- R 4 is phenyl, pyridinyl optionally substituted with halo, pyrimidinyl optionally substituted with halo, pyrizinyl, or thiazolyl;
- the present invention also provides a method of treating Alzheimer's disease in a patient comprising administering to a patient in need of such treatment an effective amount of a compound of the present invention.
- the present invention further provides a method of preventing the progression of mild cognitive impairment to Alzheimer's disease in a patient comprising administering to a patient in need of such treatment an effective amount of a compound of the present invention or a pharmaceutically acceptable salt thereof.
- the present invention further provides a method of preventing the progression in a patient at risk for developing Alzheimer's disease comprising administering to a patient in need of such treatment an effective amount of a compound of the present invention or a pharmaceutically acceptable salt thereof.
- the present invention also provides a method of inhibiting BACE in a patient comprising administering to a mammal in need of such treatment an effective amount of a compound of the present invention or a pharmaceutically acceptable salt thereof.
- the present invention also provides a method for inhibiting BACE-mediated cleavage of amyloid precursor protein comprising administering to a patient in need of such treatment an effective amount of a compound of the present invention or a pharmaceutically acceptable salt thereof.
- the present invention further provides a method for the inhibition of production of A ⁇ peptide comprising administering to a patient in need of such treatment an effective amount of a compound of the present invention or a pharmaceutically acceptable salt thereof.
- the present invention also provides a pharmaceutical formulation comprising a compound of the invention or a pharmaceutically acceptable salt thereof, in combination with a pharmaceutically acceptable carrier, diluent, or excipient.
- the formulation further comprises one or more other therapeutic agents.
- this invention provides a compound of the invention or a pharmaceutically acceptable salt thereof for use in therapy, in particular for the treatment of Alzheimer's disease or for the prevention of the progression of mild cognitive impairment to Alzheimer's disease. Even furthermore, this invention provides the use of a compound of the invention or a pharmaceutically acceptable salt thereof for the manufacture of a medicament for the treatment of Alzheimer's disease. This invention also provides the use of a compound of the invention or a pharmaceutically acceptable salt thereof for the manufacture of a medicament for the prevention of the progression of mild cognitive impairment to Alzheimer's disease. The invention also provides the use of a compound of the invention or a pharmaceutically acceptable salt thereof for the manufacture of a medicament for the inhibition of BACE. The invention further provides the use of a compound of the invention or a pharmaceutically acceptable salt thereof for the manufacture of a medicament for the inhibition of production of A ⁇ peptide.
- this invention provides a pharmaceutical formulation adapted for the treatment of Alzheimer's disease. Furthermore, this invention provides a pharmaceutical formulation adapted for the prevention of the progression of mild cognitive impairment to Alzheimer's disease. This invention also provides a pharmaceutical formulation adapted for the inhibition of BACE.
- the present invention provides a pharmaceutical formulation adapted for the inhibition of BACE-mediated cleavage of amyloid precursor protein.
- the present invention also provides a pharmaceutical formulation adapted for the treatment of conditions resulting from excessive levels of A ⁇ peptide comprising a compound of the -A-
- -C 1 -C 3 alkoxy is a -C 1 -C 3 alkyl group bonded to an oxygen atom and refers to methoxy, ethoxy, propoxy, and ⁇ o-propoxy.
- halo refers to fluoro and chloro.
- nitrogen protecting group is taken to mean a moiety that is stable to projected reaction conditions and yet may be selectively removed by reagents and reaction conditions compatible with the regenerated amine.
- Such groups are well known by the skilled artisan and are described in the literature. See, e.g., Greene and Wuts,
- inhibitors of production of A ⁇ peptide are taken to mean decreasing of in vivo levels of A ⁇ peptide in a mammal.
- effective amount of a compound of Formula I is taken to mean the dose or doses of a compound of the invention required to inhibit BACE sufficiently to decrease in vivo levels of A ⁇ peptide in a mammal.
- Mild cognitive impairment has been defined as a potential prodromal phase of dementia associated with Alzheimer's disease based on clinical presentation and on progression of patients exhibiting mild cognitive impairment to Alzheimer's dementia over time.
- Mild cognitive impairment has been defined as a potential prodromal phase of dementia associated with Alzheimer's disease based on clinical presentation and on progression of patients exhibiting mild cognitive impairment to Alzheimer's dementia over time.
- prevention of the progression of mild cognitive impairment to Alzheimer's disease includes slowing, arresting, or reversing the progression of mild cognitive impairment to Alzheimer's disease in a patient.
- the skilled artisan will also appreciate that the Cahn-Ingold-Prelog (R) or (S) designations for all chiral centers will vary depending upon the substitution patterns of the particular compound.
- the single enantiomers or diastereomers may be prepared beginning with chiral reagents or by stereoselective or stereospecific synthetic techniques. Alternatively, the single enantiomers or diastereomers may be isolated from mixtures by standard chiral chromatographic or crystallization techniques at any convenient point in the synthesis of compounds of the invention. Single enantiomers and diastereomers of compounds of the invention are a preferred embodiment of the invention.
- the compounds of the present invention are amines, and accordingly react with any of a number of inorganic and organic acids to form pharmaceutically acceptable acid addition salts.
- Pharmaceutically acceptable salts and common methodology for preparing them are well known in the art. See, e.g., P. Stahl, et al. Handbook of Pharmaceutical Salts: Properties, Selection and Use, (VCHA/Wiley-VCH, 2002); S.M. Berge, et al, "Pharmaceutical Salts," Journal of Pharmaceutical Sciences, Vol. 66, No. 1, January 1977.
- Preferred pharmaceutically acceptable salts are those formed with hydrochloric acid.
- n 0;
- n 1;
- h) p must be 0 when X is -O-;
- R 1 is pyridinyl
- R 1 is pyridinyl optionally substituted with -Cl and -F;
- R 1 is pyrimidinyl
- R 1 is pyrimidinyl or pyridinyl optionally substituted with halo
- R 1 is -NHCOR 4 , pyrimidinyl, or pyridinyl optionally substituted with -Cl and
- R 1 is -NHCOR 4 , phenyl optionally substituted with -C 1 -C 3 alkoxy, pyrimidinyl, or pyridinyl optionally substituted with -Cl and -F; r) R 1 is -NHCOR 4 , phenyl optionally substituted with -C 1 -C 3 alkoxy, or
- R 1 is -NHCOR 4 or pyrimidinyl
- R 2 is fluoro
- R 3 is -C 1 -C 3 alkoxy or hydroxy
- R 3 is -OCH 3 , -OCH 2 (CHs) 2 , or hydroxy;
- R 4 is phenyl
- R 4 is thiazolyl
- R 4 is pyridinyl optionally substituted with -Cl or -F, pyrimidinyl optionally substituted with halo, or pyrizinyl;
- R 4 is pyridinyl optionally substituted with halo, pyrimidinyl optionally
- R 4 is pyridinyl optionally substituted with halo, pyrimidinyl optionally
- R 4 is pyridinyl optionally substituted with halo or pyrimidinyl optionally substituted with halo;
- R 4 is pyridinyl
- R 4 is pyridinyl optionally substituted with halo
- R 4 is pyridinyl optionally substituted with fluoro
- the compound of the invention has a cis configuration at the chiral centers at the junction of the fused aminothiazine ring;
- the compound of the invention is a free base
- the compound of the invention is a pharmaceutically acceptable salt
- the compound of the invention is the hydrochloride salt
- the compound of the invention is the dihydrochloride salt.
- the compound of the invention is the ethanesulfonate salt.
- the compound of the invention is thep-toluenesulfonate salt.
- a preferred embodiment of the compounds of the present invention relates to compounds of the invention, wherein X is -CH 2 - or -0-; n is O or 1; m is O, 1, or 2; p is 0 or 1 ; p must be 0 when X is -O-;R X is -NHCOR 4 , pyrimidinyl, or pyridinyl optionally substituted with halo; R 2 is fluoro; R 3 is -C 1 -C 3 alkoxy or hydroxy; R 4 is pyridinyl optionally substituted with halo, pyrimidinyl optionally substituted with halo, pyrizinyl, or thiazolyl; or a pharmaceutically acceptable salt thereof.
- halo is chloro or fluoro when R 4 is pyridinyl or chloro when R 4 is pyrimidinyl.
- the compounds possess a cis configuration at the chiral centers at the junction of the fused aminothiazine ring; or a pharmaceutically acceptable salt thereof.
- Another preferred embodiment of the compounds of the present invention relates to compounds of Formula I, wherein X is -CH 2 - or -O-; n is 0 or 1 ; m is 0 or 1 ; p is 1 ; p must be 0 when X is -O-;R X is -NHCOR 4 , phenyl optionally substituted with -C 1 -C 3 alkoxy, pyrimidinyl, or pyridinyl optionally substituted with halo; R is fluoro; R is -C 1 - C 3 alkoxy or hydroxy; R 4 is pyridinyl optionally substituted with halo, pyrimidinyl optionally substituted with halo, or thiazolyl; or a pharmaceutically acceptable salt thereof.
- halo is chloro or fluoro when R 4 is pyridinyl or pyrimidinyl; or a pharmaceutically acceptable salt thereof.
- R 4 is pyridinyl or pyrimidinyl; or a pharmaceutically acceptable salt thereof.
- the compounds possess a cis configuration at the chiral centers at the junction of the fused aminothiazine ring; or a pharmaceutically acceptable salt thereof.
- a more preferred embodiment of the compounds of the present invention relates to compounds of Formula I, wherein X is -CH 2 - or -O-; n is 0 or 1; m is 0, 1, or 2; p is 0 or 1; p must be 0 when X is -O-;R X is -NHCOR4 or pyrimidinyl; R 2 is fluoro; R 3 is -C 1 - C3 alkoxy or hydroxy; R 4 is pyridinyl optionally substituted with halo, pyrimidinyl optionally substituted with halo, pyrizinyl, or thiazolyl; or a pharmaceutically acceptable salt thereof.
- halo is chloro or fluoro when R 4 is pyridinyl or pyrimidinyl; or a pharmaceutically acceptable salt thereof.
- R 4 is pyridinyl or pyrimidinyl; or a pharmaceutically acceptable salt thereof.
- the compounds possess a cis configuration at the chiral centers at the junction of the fused aminothiazine ring; or a pharmaceutically acceptable salt thereof.
- a further embodiment of the compounds of the present invention relates to compounds of Formula I, wherein X is -CH 2 - or -O-; n is 0 or 1; m is 0 or 1; p is 0 or 1; p must be 0 when X is -O-;R X is -NHCOR 4 , phenyl optionally substituted with -C 1 -C 3 alkoxy, or pyrimidinyl; R 2 is fluoro; R 3 is -C 1 -C 3 alkoxy or hydroxy; R 4 is pyridinyl optionally substituted with halo, pyrimidinyl optionally substituted with halo, pyrizinyl, or thiazolyl; or a pharmaceutically acceptable salt thereof.
- halo is chloro or fluoro when R 4 is pyridinyl or pyrimidinyl.
- R 4 is pyridinyl or pyrimidinyl.
- the compounds possess a cis configuration at the chiral centers at the junction of the fused aminothiazine ring; or a pharmaceutically acceptable salt thereof.
- a most preferred embodiment of the compounds of the present invention relates to compounds of Formula I, wherein X is -CH 2 - or -O-; n is 0 or 1; m is 0 or 1; p is 0 or 1; p must be 0 when X is -O-;R X is -NHCOR 4 or pyrimidinyl; R 2 is fluoro; R 3 is -C 1 -C 3 alkoxy or hydroxy; R 4 is pyridinyl optionally substituted with halo, or pyrimidinyl optionally substituted with halo; or a pharmaceutically acceptable salt thereof.
- halo is chloro or fluoro when R 4 is pyridinyl or pyrimidinyl; or a pharmaceutically acceptable salt thereof.
- R 4 is pyridinyl or pyrimidinyl; or a pharmaceutically acceptable salt thereof.
- the compounds possess a cis configuration at the chiral centers at the junction of the fused aminothiazine ring; or a pharmaceutically acceptable salt thereof.
- Another most preferred embodiment of the compounds of the present invention relates to compounds of Formula I, wherein X is -CH 2 - or -O-; n is 0 or 1; m is 0 or 1; p is 0; R 1 is -NHCOR 4 ; R 2 is fluoro; R 4 is pyridinyl optionally substituted with halo; or a pharmaceutically acceptable salt thereof.
- halo is chloro or fluoro when R 4 is pyridinyl; or a pharmaceutically acceptable salt thereof.
- An especially preferred embodiment of the compounds of the present invention relates to compounds of Formula I wherein X is -O-; n is 0; m is 1; p is 0; R 1 is
- R 2 is halo;
- R 4 is pyridinyl substituted with halo; or a pharmaceutically acceptable salt thereof.
- R is fluoro; or a pharmaceutically acceptable salt thereof.
- the compounds possess a cis configuration at the chiral centers at the junction of the fused aminothiazine ring; or a pharmaceutically acceptable salt thereof.
- the compounds of Formula I are inhibitors of BACE.
- the present invention also provides a method of inhibiting BACE in a mammal that comprises administering to a mammal in need of said treatment a BACE-inhibiting amount of a compound of Formula I. It is preferred that the mammal to be treated by the administration of the compounds of Formula I is human.
- the compounds of the present invention are useful for suppressing the production of A ⁇ peptide, and therefore for the treatment of disorders resulting from excessive A ⁇ peptide levels due to over-production and/or reduced clearance of A ⁇ peptide.
- a further embodiment of the present invention is the use of a compound of Formula I for the manufacture of a medicament for treating a disease or condition capable of being improved or prevented by inhibition of BACE.
- the compounds of Formula I are therefore believed to be useful in treating or preventing Alzheimer's disease, mild cognitive impairment, Down's Syndrome, Hereditary Cerebral Hemorrhage with Amyloidosis of the Dutch-Type, cerebral amyloid angiopathy, other degenerative dementias such as: dementias of mixed vascular and degenerative origin, dementia associated with Parkinson's disease, dementia associated with progressive supranuclear palsy, dementia associated cortical basal degeneration, and diffuse Lewy body type of Alzheimer's disease.
- the compounds of the present invention, or salts thereof may be prepared by a variety of procedures known in the art, some of which are illustrated in the Schemes, Preparations, and Examples below.
- ⁇ BTU O-benzotriazole-N,N,N',N'-tetramethyl-uronium- hexafluoro-phosphate
- ⁇ OAt refers to l-hydroxy-7-azabenzotriazole
- iPrO ⁇ refers to isopropanol
- MeOH refers to methyl alcohol or methanol
- (OEt) refers to ethoxide
- PyBOP refers to benzotriazol-1-yloxytripyrrolidino-phosphonium
- T ⁇ F trifluoroacetic acid
- EtOH ethyl alcohol or ethanol
- SCX strong cation exchange
- T R retention time
- IC50 concentration of an agent that produces 50% of the maximal inhibitory response possible for that agent
- APP amyloid precursor protein
- DMEM Dulbecco's Modified Eagle's Medium
- F12 refers to Ham's F12 medium
- FBS Fetal Bovine Serum
- FRET fluorescence resonance energy transfer
- HEK refers to human embryonic kidney
- PDAPP platelet derived amyloid precursor protein
- RU refers to relative fluorescence unit.
- Scheme I depicts the acylation of an appropriate amine compound of formula (1) with an aryl carboxylic acid of formula (2) to give a compound of formula (I) after the deprotection of the intermediate (3).
- PG is a protecting group developed for the amino group, such as carbamates and amides. Such protecting groups are well known and appreciated in the art.
- a compound of formula (1) is reacted with a compound of formula (2) under coupling conditions.
- a compound of formula (2) under coupling conditions.
- a coupling reagent and an amine base such as DIPEA or triethylamine
- Coupling reagents include carbodiimides, such as DCC, DIC, EDCI, and aromatic coupling reagents, such as HOBt and HOAt.
- uronium or phosphonium salts of non- nucleophilic anions such as HBTU, HATU, PyBOP, and PyBrOP can be used in place of the more traditional coupling reagents.
- Additives such as DMAP may be used to enhance the reactions.
- a compound of formula (1) can be acylated using substituted benzoyl chlorides in the presence of a base, such as triethylamine or pyridine.
- the protecting group in intermediate (3) can be removed under acidic or basic conditions to give the compounds of formula (1).
- the deprotection of such compounds is well known and appreciated in the art.
- a pharmaceutically acceptable salt of a compound of Formula (I) can be formed by reaction of an appropriate free base of Formula (I) with an appropriate pharmaceutically acceptable acid in a suitable solvent under standard conditions. Additionally, the formation of such salts can occur simultaneously upon deprotection of a nitrogen protecting group. The formation of such salts is well known and appreciated in the art.
- Scheme II depicts the alkylation of an appropriate compound of formula (4) with an aryl boronic acid (5) to give a compound of formula I after deprotection of the intermediate (6).
- Y is trifluoromethanesulfonyl or a halogen, such as Br or I.
- R 1 is an aryl group, such as phenyl, or a heteroaryl group, such as pyridinyl.
- a suitable palladium reagent includes bis(triphenylphosphine)palladium(II) chloride, tris(dibenzylideneacetone)dipalladium (O) with tricyclohexylphosphine, (1,1 '-bis(diphenylphosphino)ferrocene)palladium(II) chloride, palladium tetrakistriphenylphosphine, or palladium(II) acetate.
- a suitable base includes cesium carbonate, sodium carbonate, potassium carbonate, or potassium phosphate tribasic monohydrate.
- the protecting group can be removed under acidic or basic conditions to give bi- aryl compounds of formula I.
- the deprotection of such compounds is well known and appreciated in the art.
- Scheme III depicts two variations to prepare the primary amine (1) starting from an appropriate aryl bromide (7).
- azido-dehalogenation is performed on the appropriate aryl bromide (7) in the presence of an azide source, such as sodium azide.
- an azide source such as sodium azide.
- Reduction of the resulting azide (8) to the primary amine (1) may be effected by using a number of reducing agents well known in the art, such as LiAlH 4 , NaBH 4 , PPI13, or via
- the appropriate primary amine (1) can be prepared directly by reacting an appropriate aryl bromide (7) with an ammonia surrogate, such as trifluoroacetamide in the presence of a catalyst, such as copper iodide, a base, such as potassium carbonate, and a ligand, such as (+/-) trans N,N'-dimethyl 1,2- cyclohexanediamine.
- an ammonia surrogate such as trifluoroacetamide
- a catalyst such as copper iodide
- a base such as potassium carbonate
- a ligand such as (+/-) trans N,N'-dimethyl 1,2- cyclohexanediamine
- compounds of formula (7) can be promptly prepared by methods similar to those described herein by procedures that are well-known and established in the art. As will be readily understood, the steps to prepare the compounds of formula I are dependent upon the particular compound being synthesized, the starting compound, and the relative lability of the substituted moieties.
- the mass spectrometry data is obtained via LC/MS: Phenomenex Gemini C 18 (2.0 x 50 ⁇ m, 3.5 ⁇ m) column at a temperature of 50 0 C +/- 10 0 C with a flow rate of 1 mL/min.
- the elution system is 5 to 100% AC ⁇ w/ 0.1% ammonium hydroxide for 7.0 minutes then held at 100% AC ⁇ for 1.0 minute coupled with electrospray ionization (100-800 amu scan range; 0.2 amu step; 80v Fragmentor; 1.0 gain; 80 threshold).
- the gas chromatography data unless specified otherwise is obtained via GC/MS: Agilent gas chromatography DB-5ms (0.25 mm x 15 m x 0.25 ⁇ m) with a temperature program of 60 - 280 0 C in 7.3 minutes then held at 280 0 C for 2.0 minutes and a split ratio of 20:1.
- Tetrabutylammonium hydrogenosulfate (470 g, 1.40 mol) is added to a solution of sodium hydroxide (6.6 Kg, 165 mol) in water (14 L) and toluene (14 L) at 20 0 C.
- AHyI alcohol 801.5 g, 13.8 mol is added and the mixture is stirred at 20 0 C for Ih.
- the mixture is cooled to 5 0 C, and tert-butyl 2-bromoacetate (4 Kg, 20.5 mol) is added slowly maintaining the internal temperature below 15 0 C.
- the reaction mixture is stirred at room temperature for 16 h.
- the mixture is diluted with water (12 L) and hexanes (12 L) and the organic phase is separated.
- Zinc powder (190 g, 2.91 mol) is added to a mixture of racemic (3aSR,6aSR)-6a- (5-bromo-2-fluorophenyl)hexahydrofuro[3,4-c]isoxazole (84 g, 290 mmol) in acetic acid (1.4 L) at a rate maintaining the temperature below 30 0 C.
- the reaction is heated at 40 0 C for 5 h.
- the reaction is cooled to room temperature and is filtered through a pad of diatomaceous earth, washed with acetic acid and water (200 mL). The solvent is removed under reduced pressure. Water (500 mL) is added to the residue, and the pH is adjusted to pH 10 with 2 M aqueous sodium hydroxide.
- Racemic N-((4aSR,7aSR)- (7a(5-bromo-2-fluorophenyl)-4a,5,7,7a-tetrahydro-4H- furo[3,4-(/][l,3]thiazin-2-yl)benzamide (108 g, 248 mmol) is purified by chiral ⁇ PLC: Chiralcel OJ- ⁇ 8 x 25 cm column; eluent: 90 : 10 (methanol : acetonitrile) with 0.2% dimethylethylamine; flow: 300 mL/min at UV 254 nm. The second eluting isomer is isolated to provide the enantiomerically enriched title compound (42.0 g, 40%). ES/MS m/e ( 7 W 1 Br) 434.9/436.9 (M+ 1).
- Aqueous hydrochloric acid (158 mL) is added to N-(7a-(5-bromo-2- fluorophenyl)-4a,5,7,7a-tetrahydro-4H-furo[3,4-d][l,3]thiazin-2-yl)benzamide (16.35 g, 7.89 mmol) and the mixture is heated to 90 0 C. After 18 hours, the mixture is allowed to cool to ambient temperature and washed with dichloromethane. The organic layer is extracted once with 5 ⁇ aqueous hydrochloric acid.
- 1,4-dioxane (731 mL) (previously degassed with vacuum-nitrogen) is added via cannula, and N,N'-dimethyl-, trans (+/-) 1 ,2-cyclohexanediamine (10.1 g, 70.8 mmol) is added.
- the mixture is placed in a preheated oil bath at 100 0 C and stirred at this temperature for 19 h.
- the septum is replaced by a reflux condenser and a mixture of methanol (154 mL) and water (154 mL) is added through the condenser.
- the mixture is stirred at 100 0 C for 3.5 h, cooled to 22 0 C, and concentrated partially under reduced pressure (to 0.6 L volume).
- Aqueous ammonium hydroxide (25%, 154 mL) is added and the mixture is stirred for 10 min.
- the mixture is extracted three times with ethyl acetate (3 X 500 mL) and the solvent is removed under reduced pressure.
- a residue is obtained that is purified by flash chromatography with a linear gradient of 50% to 75% ethyl acetate in hexane to give the title compound (14.9 g, 47%).
- a 0.66 M solution of L-ascorbic acid is prepared by dissolving L-ascorbic acid sodium salt (0.79 g, 2.0 mmol) in water (6 mL). N-((4aS,7aS)-7a-(3-bromophenyl)- 4a,5,7,7a-tetrahydro-4H-fiiro[3,4-d][l,3]thiazin-2-yl)benzamide (1.40 g, 3.35 mmol) and 1,2-cyclohexanediamine, N,N'-dimethyl-, trans (+/-) (162 mg, 1.11 mmol) are dissolved in ethanol (13.4 mL).
- N-((4aS,7aS)-7a-(3-azidophenyl)-4a,5,7,7a-tetrahydro-4H-furo[3,4-d][l,3]thiazin- 2-yl)benzamide (0.62 g, 1.63 mmol) is diluted with ethanol (10 mL) and Pd on carbon (10%, wet, 0.062 g). The mixture is degassed and stirred at room temperature under hydrogen (30 psi) overnight. The mixture is filtered through diatomaceous earth using ethanol as a rinse. The solvent is removed under reduced pressure to give the title compound, (0.106 g, 18%). ES/MS m/e: 354 (M+l).
- Iron powder (16.49 g, 291 mmol) is added to 1 -bromo-2,4-difluorobenzene (110 mL, 968 mmol) in 1,2-dichloroethane (968 mL) in a 3 -neck flask at ambient temperature under a stream of nitrogen.
- 1,2-dichloroethane (968 mL) is added dropwise over 1 hour and the reaction mixture is stirred at ambient temperature for 18 h.
- the reaction mixture is cooled to 0 0 C and a saturated aqueous solution of sodium bisulfite (1.11 L, 533 mmol) is added portionwise and the mixture is separated.
- the aqueous phase is extracted with dichloromethane.
- the organic layer is washed with a saturated aqueous solution of sodium bicarbonate, water, and brine.
- the organic layer is dried over sodium sulfate, and the solvent is removed under reduced pressure to give a residue purified with a pad of silica using diethyl ether to give the title compound (229 g, 76%).
- Racemic tert-butyl (4aSR,8aSR)-8a-(3-bromophenyl)-4,4a,5,7,8,8a- hexahydropyrano[4,3-d][l,3]thiazin-2-ylcarbamate (2.80 g, 6.55 mmol) is purified by chiral HP LC: Column: Chiralcel OJ 8 x 35 cm; eluent: 75 : 25 (methanol : acetonitrile); flow: 400 mL/min at UV 260 nm. The second eluting isomer is isolated to provide the enantiomerically enriched title compound (1.31 g, 47%). ES/MS m/e ( 79 Br/ 81 Br) 427, 429 (M+l).
- a 0.33 M solution of copper sulfate is prepared by dissolving copper (II) sulfate pentahydrate (1.0 g, 2.0 mmol) in water (12 mL).
- a 0.66 M solution of L-ascorbic acid is prepared by dissolving L-ascorbic acid sodium salt (1.58 g, 4.0 mmol) in water (12 mL).
- Racemic tert-butyl (4aSR,7aSR)-7a-(2-fluoro-5-(5-fluoropicolinamido)phenyl)- 4a,5,7,7a-tetrahydro-4H-fiiro[3,4-d][l,3]thiazin-2-ylcarbamate (0.226 g, 0.460 mmol) is purified by chiral ⁇ PLC: 2.1 x 25 cm Chiralcel OD- ⁇ , 5 micron column, 30% methanol/CO 2 , flow rate: 70 mL/min, UV: 230 nm. The second eluting isomer is isolated to provide the enantiomerically enriched title compound (0.092 g, 41%). ES/MS (m/e): 491 (M+l).
- the reaction mixture is heated at 110 0 C for 7 hours.
- the reaction is cooled, diluted with ethyl acetate, and filtered.
- the resulting filtrate is separated and the aqueous layer is extracted three times with ethyl acetate.
- the combined organic layers are washed with brine, dried over sodium sulfate, filtered, and concentrated under reduced pressure.
- the crude product is purified by silica gel chromatography eluting with 10% to 20% ethyl acetate in hexanes gradient over 20 minutes to give the title compound (7.59 g, 92%).
- the crude product is purified by silica gel chromatography eluting with a linear gradient of 10% to 40% ethyl acetate in hexanes over 26 minutes to give a crude diastereomeric mixture (7.39 g, 100%).
- the mixture is purified again on silica gel chromatography to separate the diastereomers eluting with 15% ethyl acetate in hexanes to give the title compound as a racemic mixture (1.47 g, 24%).
- Racemic N-((4aRS,6RS,7aSR)-6-hydroxy-7a-(3'-methoxybiphenyl-3-yl)- 4,4a,5,6,7,7a-hexahydrocyclopenta[d][l,3]thiazin-2-yl)benzamide (0.689 g, 1.50 mmol) is purified by chiral HPLC: 2.1 x 25 cm Chiralpak AD-H, 5 micron, 35% IPA/CO 2 , flow rate: 70 mL/min, UV: 225 nm. The first eluting isomer is isolated to provide the enantiomerically enriched title compound (0.242 g, 35%). ES/MS m/e: 459 (M+l).
- the resulting mixture is stirred at 0 0 C for 1 hour, and then is warmed to room temperature over 24 h.
- the mixture is diluted with dichloromethane, quenched by addition of saturated aqueous solution of sodium bicarbonate, and is extracted three times with dichloromethane.
- the combined organic layers are washed with water and brine.
- the organic layer is dried over sodium sulfate, filtered, and concentrated under reduced pressure.
- the crude product is purified by silica gel chromatography eluting with a linear gradient of 0% to 60% ethyl acetate in hexanes over 26 minutes to give the title compound (0.089, 93%).
- Racemic N-((4aRS,6RS,7aSR)-7a-(3-bromo-4-fluorophenyl)-6-hydroxy- 4,4a,5,6,7,7a-hexahydrocyclopenta[d][l,3]thiazin-2-yl)benzamide (0.492 g, 1.09 mmol) is purified by chiral HPLC: Column: Chiralcel OJ-H 3 x 25 cm; eluent: 75 : 25 (methanol : acetonitrile); flow: 40 mL/min at UV 225 nm. The second eluting isomer is isolated to provide the enantiomerically enriched title compound (0.171 g, 35%).
- Method A The solid (16 g) is suspended in 240 mL of water and an aqueous solution of 2N sodium hydroxide is added (1.5eq, 3 ImL). The mixture is placed in an ultrasound bath for 15 min at 22 0 C and stirred at 22 0 C for 3 h. The white solid is filtered, washed with water (3 x 100 mL), and dried in a vacuum oven at 45 0 C overnight to yield the title compound (14 g). ES/MS m/e 391(M+1).
- Method B The solid (3 g) is suspended in methanol (40 mL) and heated between 62 to 64 0 C for 15 h with seeding with seeds of the free base of N-(3-((4aS,7aS)-2-Amino- 4a,5,7,7a-tetrahydro-4H-fiiro[3,4-d][l,3]thiazin-7a-yl)-4-fluorophenyl)-5- fluoropicolinamide. The mixture is cooled to room temperature and the slurry is filtered. The solid is washed with methanol and dried in a vacuum oven at 50 0 C for 4 h to yield the title compound (2.3 g). ES/MS m/e 391 (M+l).
- the mixture is diluted with dichloromethane and aqueous 0.1 M ⁇ aO ⁇ and is extracted five times with dichloromethane.
- the combined organic phase is diluted with MeOH to make a homogenous solution, dried over sodium sulfate, filtered, and the solvent is removed under reduced pressure to give a residue that is purified on silica gel with 5% methanol in dichloromethane to give the title compound as the freebase (0.109 g, 51%).
- Hydrogen chloride is bubbled through the solution of N-(3-((4aS,7aS)-2-amino-4a,5,7,7a- tetrahydro-4H-furo[3,4-d][l,3]thiazin-7a-yl)-5-fluorophenyl)-5-fluoropicolinamide (0.109 g, 0.279 mmol) in methanol for approximately 5 min.
- the solution is then concentrated under reduced pressure and dried on high vacuum to yield the title compound (0.128 g, 51%).
- Aqueous hydrochloric acid (8.70 mL) is added to N-((4aS,7aS)-7a-(2,4- difluoro-5-(5-fluoropyridin-3-yl)phenyl)-4a,5,7,7a-tetrahydro-4H-furo[3,4-d][l,3]thiazin- 2-yl)benzamide (0.252 g, 0.435 mmol) in methanol (4 mL) and the mixture is heated to 90 0 C. After 18 hours, the heat is removed and the p ⁇ of the reaction mixture is adjusted to basic with 5 ⁇ aqueous sodium hydroxide. The mixture is extracted three times with 10% isopropyl alcohol in dichloromethane.
- test compounds are prepared in DMSO to make up a 10 mM stock solution.
- the stock solution is serially diluted in DMSO to obtain a ten-point dilution curve with final compound concentrations ranging from 10 mM to 1 nM in a 96-well round-bottom plate before conducting the in vitro enzymatic and whole cell assays.
- Serial dilutions of test compounds are prepared as described above. Compounds are further diluted 2OX in KH 2 PO 4 buffer. Ten ⁇ L of each dilution is added to each well on row A to H of a corresponding low protein binding black plate containing the reaction mixture (25 ⁇ L of 50 mM KH 2 PO 4 , pH 4.6, 1 mM TRITON® X-IOO, 1 mg/mL Bovine Serum Albumin, and 15 ⁇ M of FRET substrate) (See Yang, et. ah, J. Neurochemistry, 91(6) 1249-59 (2004)). The content is mixed well on a plate shaker for 10 minutes.
- Human BACEl (accession number: AF 190725) is cloned from total brain cDNA by room temperature-PCR. The nucleotide sequences corresponding to amino acid sequences #1 to 460 are inserted into the cDNA encoding human IgGi (Fc) polypeptide (Vassar et al. 1999). This fusion protein of BACEl (1-460) and human Fc, named /zwBACEl:Fc, is constructed into the pJB02 vector. Human BACEl(l-460):Fc
- the routine whole cell assay for the measurement of inhibition of beta-secretase activity utilizes the human embryonic kidney cell line HEK293p (ATCC Accession No. CRL-1573) stably expressing a human APP751 cDNA containing the naturally occurring double mutation Lys651Met652 to Asn651Leu652, commonly called the Swedish mutation (noted HEK293/APP751sw) and shown to overproduce Abeta (Citron, et ah, Nature, 360, 672-674 (1992)).
- HEK293/APP751sw at 3.5xlO 4 cells/well, containing 200 ⁇ L culture media, DMEM containing 10% FBS) are incubated at 37 0 C for 4 to 24 h in the presence/absence of inhibitors (diluted in DMSO) at the desired concentration.
- conditioned media are analyzed for evidence of beta-secretase activity, for example, by analysis of Abeta peptides.
- Total Abeta peptides (Abeta 1-x) are measured by a sandwich ELISA, using monoclonal 266 as a capture antibody and biotinylated 3D6 as reporting antibody.
- Abeta 1-40 and Abeta 1-42 peptides are measured by a sandwich ELISA, using monoclonal 2G3 as a capture antibody for Abeta 1-40, and monoclonal 2 IF 12 as a capture antibody for Abeta 1-42.
- Both Abeta 1-40 and Abeta 1-42 ELISAs use biotinylated 3D6 as the reporting antibody.
- the concentration of Abeta released in the conditioned media following the compound treatment corresponds to the activity of BACEl under such conditions.
- the 10-point inhibition curve is plotted and fitted with the four-parameter logistic equation to obtain the EC50 and IC50 values for the Abeta-lowering effect.
- a confirmatory whole cell assay is also run in primary neuronal cultures generated from PDAPP transgenic embryonic mice.
- Primary cortical neurons are prepared from Embryonic Day 16 PDAPP embryos and cultured in 96 well plates (15 x 10 4 cells/well in DMEM/F12 (1: 1) plus 10% FBS). After 4-6 days in vitro, culture media is replaced with serum free DMEM/F12 (1: 1) containing B27 supplement and neurons are incubated at 37 0 C for 24 h in the presence/absence of inhibitors (diluted in DMSO) at the desired concentration. At the end of the incubation, conditioned media are analyzed for evidence of beta-secretase activity, for example, by analysis of Abeta peptides.
- Total Abeta peptides are measured by a sandwich ELISA, using monoclonal 266 as a capture antibody and biotinylated 3D6 as reporting antibody.
- Abeta 1-40 and Abeta 1-42 peptides are measured by a sandwich ELISA, using monoclonal 2G3 as a capture antibody for Abeta 1-40, and monoclonal 2 IF 12 as a capture antibody for Abeta 1-42.
- Both Abeta 1-40 and Abeta 1-42 ELISAs use biotinylated 3D6 as the reporting antibody.
- the concentration of Abeta released in the conditioned media following the compound treatment corresponds to the activity of BACEl under such conditions.
- the 10-point inhibition curve is plotted and fitted with the four-parameter logistic equation to obtain the EC50 and IC50 values for the Abeta-lowering effect.
- the following exemplified compounds were tested essentially as described above and exhibited the following activity for Abeta lowering effect:
- Beta-Secretase Several animal models, including mouse, guinea pig, dog, and monkey, may be used to screen for inhibition of beta- secretase activity in vivo following compound treatment.
- Animals used in this invention can be wild type, transgenic, or gene knockout animals.
- the PDAPP mouse model prepared as described in Games et al., Nature 373, 523-527 (1995), and other non-transgenic or gene knockout animals are useful to analyze in vivo inhibition of Abeta and sAPPbeta production in the presence of inhibitory compounds.
- mice 2 to 12 month old PDAPP mice, gene knockout mice or non-transgenic animals are administered compound formulated in vehicles, such as corn oil, cyclodextran, phosphate buffers, PHARMASOLVE®, or other suitable vehicles.
- vehicles such as corn oil, cyclodextran, phosphate buffers, PHARMASOLVE®, or other suitable vehicles.
- animals are sacrificed, and brains as well as cerebrospinal fluid and plasma are removed for analysis of Abetas, C99, and sAPP fragments.
- PHARMASOLVE® phosphate buffers
- sAPP fragments See Dovey, et al, Journal ofNeurochemistry, 76, 173-181 (2001); and Johnson- Wood, et al, Proc. Natl Acad. Sci. USA, 94, 1550-1555 (1997)).
- mice are dosed with various concentrations of compound and compared to a vehicle-treated control group dosed at the same time.
- brain tissue, plasma, or cerebrospinal fluid is obtained from selected animals, beginning at time 0 to establish a baseline. Compound is administered to other groups and sacrificed at various times after dosing.
- Brain tissue, plasma, or cerebrospinal fluid is obtained from selected animals and analyzed for the presence of APP cleavage products, including Abeta peptides, sAPPbeta, and other APP fragments, for example, by specific sandwich ELISA assays.
- mice are sacrificed and brain tissues, plasma, or cerebrospinal fluid are analyzed for the presence of Abeta peptides, C99, and sAPPbeta, as appropriate. Brain tissues of APP transgenic animals are also analyzed for the amount of beta-amyloid plaques following compound treatment.
- Animals (PDAPP or other APP transgenic or non-trans genie mice) administered an inhibitory compound may demonstrate the reduction of Abeta or sAPPbeta in brain tissues, plasma or cerebrospinal fluids and decrease of beta amyloid plaques in brain tissue, as compared with vehicle-treated controls or time zero controls. For example, 3 hours after administration of 10 mg/kg subcutaneous dose of the compound of Example 1 to young female PDAPP mice, Abeta 1 -x peptide, C99 and sAPPb levels are reduced approximately 64%, 60%, and 44% in brain cortex, respectively, compared to vehicle- treated mice.
- CSF sAPPbeta levels are reduced 22%, while CSF sAPPalpha levels are unchanged 3 hours after oral administration of a 10 mg/kg dose of the compound of Example 1.
- the compounds of the present invention are preferably formulated as
- compositions administered by a variety of routes are for oral administration.
- Such pharmaceutical compositions and processes for preparing same are well known in the art. See, e.g., Remington: The Science and Practice of Pharmacy (A. Gennaro, et. ah, eds., 19 th ed., Mack Publishing Co., 1995).
- the compounds of Formula I are generally effective over a wide dosage range.
- dosages per day normally fall within the range of about 0.01 to about 30 mg/kg of body weight. In some instances dosage levels below the lower limit of the aforesaid range may be more than adequate, while in other cases still larger doses may be employed without causing any harmful side effect, and therefore the above dosage range is not intended to limit the scope of the invention in any way. It will be understood that the amount of the compound actually administered will be determined by a physician, in the light of the relevant circumstances, including the condition to be treated, the chosen route of administration, the actual compound or compounds administered, the age, weight, and response of the individual patient, and the severity of the patient's symptoms.
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CA2764429A CA2764429C (en) | 2009-07-09 | 2010-07-06 | Condensed aminodihydrothiazine derivatives as bace inhibitors |
JP2012519660A JP5666578B2 (en) | 2009-07-09 | 2010-07-06 | BACE inhibitor |
MX2012000510A MX2012000510A (en) | 2009-07-09 | 2010-07-06 | Bace inhibitors. |
CN201080030698.1A CN102471296B (en) | 2009-07-09 | 2010-07-06 | Bace inhibitors |
KR1020127000457A KR101362557B1 (en) | 2009-07-09 | 2010-07-06 | Bace inhibitors |
MA34517A MA33492B1 (en) | 2009-07-09 | 2010-07-06 | BACE INHIBITORS |
EP10731890.9A EP2451793B1 (en) | 2009-07-09 | 2010-07-06 | Bace inhibitors |
NZ596579A NZ596579A (en) | 2009-07-09 | 2010-07-06 | Bace inhibitors |
BR112012000525A BR112012000525A2 (en) | 2009-07-09 | 2010-07-06 | bace inhibitors |
AU2010270691A AU2010270691B8 (en) | 2009-07-09 | 2010-07-06 | BACE inhibitors |
SG2012001749A SG177594A1 (en) | 2009-07-09 | 2010-07-06 | Bace inhibitors |
IL216742A IL216742A0 (en) | 2009-07-09 | 2011-12-01 | Bace inhibitors |
ZA2011/09385A ZA201109385B (en) | 2009-07-09 | 2011-12-20 | Bace inhibitors |
TNP2011000673A TN2011000673A1 (en) | 2009-07-09 | 2011-12-28 | Bace inhibitors |
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