WO1996013262A1 - Muscarine antagonists - Google Patents
Muscarine antagonists Download PDFInfo
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- WO1996013262A1 WO1996013262A1 PCT/US1995/013710 US9513710W WO9613262A1 WO 1996013262 A1 WO1996013262 A1 WO 1996013262A1 US 9513710 W US9513710 W US 9513710W WO 9613262 A1 WO9613262 A1 WO 9613262A1
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- Prior art keywords
- piperidin
- dihydro
- benzimidazol
- pyrimidinecarbonyl
- ethyl
- Prior art date
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- 0 CCCC(CC***C)*C(C)=C(N**=O)N=C Chemical compound CCCC(CC***C)*C(C)=C(N**=O)N=C 0.000 description 5
- KLXKCRQGBLBRJL-UHFFFAOYSA-N OC(CC1)CCC1N(CC1)CCC1N(c(ccc(Cl)c1)c1N1)C1=O Chemical compound OC(CC1)CCC1N(CC1)CCC1N(c(ccc(Cl)c1)c1N1)C1=O KLXKCRQGBLBRJL-UHFFFAOYSA-N 0.000 description 2
- PVJDSQZAPVYWQI-KOMQPUFPSA-N Cc(cc1)cc(N2)c1N(C(CC1)CCN1[C@H](CC1)CC[C@@H]1O)C2=O Chemical compound Cc(cc1)cc(N2)c1N(C(CC1)CCN1[C@H](CC1)CC[C@@H]1O)C2=O PVJDSQZAPVYWQI-KOMQPUFPSA-N 0.000 description 1
- NWSRKHZBGUODAJ-UHFFFAOYSA-N Cc(cc1NC=O)ccc1NC(CC1)CCN1C(CC1)CCC1O Chemical compound Cc(cc1NC=O)ccc1NC(CC1)CCN1C(CC1)CCC1O NWSRKHZBGUODAJ-UHFFFAOYSA-N 0.000 description 1
- QLYMXWCWASMEMO-UHFFFAOYSA-N OC(CC1)CCC1N(CC1)CCC1N(c(cccc1)c1N1)C1=O Chemical compound OC(CC1)CCC1N(CC1)CCC1N(c(cccc1)c1N1)C1=O QLYMXWCWASMEMO-UHFFFAOYSA-N 0.000 description 1
- QLYMXWCWASMEMO-CTYIDZIISA-N O[C@H](CC1)CC[C@@H]1N(CC1)CCC1N(c(cccc1)c1N1)C1=O Chemical compound O[C@H](CC1)CC[C@@H]1N(CC1)CCC1N(c(cccc1)c1N1)C1=O QLYMXWCWASMEMO-CTYIDZIISA-N 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
- C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
- C07D401/04—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings directly linked by a ring-member-to-ring-member bond
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P27/00—Drugs for disorders of the senses
- A61P27/02—Ophthalmic agents
-
- 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
- C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
- C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
- C07D401/12—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings linked by a chain containing hetero atoms as chain links
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
- C07D401/14—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing three or more hetero rings
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D403/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00
- C07D403/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings
- C07D403/12—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings linked by a chain containing hetero atoms as chain links
Definitions
- This invention relates to control of ocular development in general and, more particularly, to the treatment of the eye to prevent and/or arrest the development of myopia (nearsightedness).
- myopia nearsightedness
- myopia Approximately one of every four persons suffer from myopia, i.e., an elongation of the eye along the visual axis.
- myopia afflicts 10% to 75% of the youth of the world, depending upon race, geographic distribution and level of education.
- Myopia is not a trivial maldevelopment of the eye. In its pathologic form, the sclera continues to grow and as result the retina stretches and degenerates resulting in permanent blindness.
- Cycloplegics are topically administered drugs that relax the ciliary muscle of the eye, which is the muscle that focuses the eye by controlling lens dimensions.
- the classic cycloplegic drug is the belladonna alkaloid atropine, available for over a century.
- Atropine is a long-acting non-specific
- ACh neurotransmitter acetylcholine
- Atropine is impractical in that it causes mydriasis (increase of pupil size) and its action on the ciliary muscle to inhibit ocular focusing impairs near visual work like reading.
- the receptors in the iris and ciliary muscle responsible for the side effects of atropine are of the M3 subtype.
- studies have shown that muscarinic receptors in the retina of a variety of non-human species are comprised of m1 , m2 and m4 subtypes. Accordingly, a muscarinic antagonist with low m3 activity would be efficacious in prevention of the development of myopia without the undesirable side effects associated with the use of atropine.
- retinal concentrations of dopamine were found to be reduced during such image deprivation and the ocular administration of a dopamine-related agent, e.g., apomorphine, a dopamine agonist, was found to inhibit or actually prevent the axial enlargement of the eye under conditions ordinarily leading to such enlargement.
- a dopamine-related agent e.g., apomorphine, a dopamine agonist
- Cholinergic receptors are proteins embedded in the wall of a cell that respond to the chemical acetylcholine. Particularly, it is now known that the cholinergic receptors are subdivided into nicotinic and muscarinic receptors and that the muscarinic receptors are not all of the same type. Recent literature indicates that there are at least five types of cholinergic muscarinic receptors (types ml through m5). Receptors of type ml are those present in abundance and thought to be enriched in the brain neural tissue and neural ganglia. The other receptors are concentrated in other tissues such as the heart, smooth muscle tissue or glands. While many others are at least five types of cholinergic muscarinic receptors (types ml through m5). Receptors of type ml are those present in abundance and thought to be enriched in the brain neural tissue and neural ganglia. The other receptors are concentrated in other tissues such as the heart, smooth muscle tissue or glands. While many others
- pharmacological agents interacting with muscarinic receptors influence several types, some agents are known to have a major effect on a single type of receptor with relative selectivity and other agents can have a relatively selective effect on a different single receptor. Still other agents may have a significant effect on more than one or even all types of receptors.
- dihydrochloride are anticholinergic, antimuscarinic, and relatively selective for Ml receptors. See U.S. Pat. No. 5,122,522. It is also known that 4-DAMP (4-diphenylacetoxy-N-methylpiperadine methiodide) is a relatively selective antagonist for smooth muscle (ordinarily called M3 type but variously called type M2 or M3, as the current classification of receptors is in flux). Pirenzepine, being primarily an M1 antagonist, inhibits axial elongation, but is far less effective at pupil dilation than atropine or another cycloplegic agent. This makes it possible to suppress the development of myopia
- This invention is concerned with novel 1,3-dihydro-1 - ⁇ 1 -[piperidin-4-yl]piperidin-4-yl ⁇ -2H-benzimidazol-2-ones and 1,3-dihydro-1 - ⁇ 4-amino-1 -cyclohexyl ⁇ -2H-benzimidazol-2-ones, their compositions and method of use.
- the novel compounds are selective muscarinic antagonists of the m1 , m2, and m4 subtypes with low activity at the m3 subtype.
- the compounds have good ocular
- the compounds are effective for the treatment and/or prevention of myopia.
- novel compounds of this invention are represented by the structural formula: wherein:
- N is nitrogen
- O oxygen
- NBCONB2 CB 2 COCB 2 , CB 2 CONB, NBCOCB 2 , or OB
- W is O or H 2 ;
- B is H, Me, Et, Pr, iPr, CH 2 OH, CO 2 Me, CO 2 Et,
- Q is phenyl or heterocycle ring unsubstimted or
- R is independently taken from H, small alkyl , branched alkyl, halo, alkoxy, OH, amino, dialkylamino, or alkyla
- heterocycle or heterocyclic as used herein except where noted, represents a stable 5- to 7- membered
- heterocyclic ring may be attached at any heteroatom or carbon atom which results in the creation of a stable structure.
- heterocyclic rings include pyridine, pyrazine, pyrimidine, pyridazine, triazine, imidazole, pyrazole, triazole, quinoline.
- alkyl is intended to include both branched and straight chain saturated aliphatic hydrocarbon groups having the specified number of carbon atoms (Me is methyl, Et is ethyl, Pr is propyl, Bu is butyl).
- alkoxy represents an alkyl group of indicated carbon atoms attached through an oxygen linkage.
- alkylamino represents an alkyl group of indicated carbon atoms attached through a nitrogen atom linkage.
- dialkylamino represents two alkyl groups of indicated carbon atoms attached through a nitrogen atom linkage.
- small alkyl is intended to indicate those alkyls with C1 to C4 carbon atoms, either branched or linear in connection.
- alkylsulfonyl represents an alkyl group of indicated carbon atoms attached through an sulfonyl (SO 2 ) linkage.
- halo represents fluoro, chloro, bromo or iodo.
- the pharmaceutically acceptable salts of the compounds of formula I include the conventional non-toxic salts or the quarternary ammonium salts of the compounds of formula I formed e.g. from non-toxic inorganic or organic acids.
- such conventional non-toxic salts include those derived from inorganic acids such as hydrochloric, hydrobromic, sulfuric, sulfamic,
- phosphoric, nitric and the like and the salts prepared from organic acids such as acetic, propionic, succinic, glycolic, stearic, lactic, malic, tartaric, citric, ascorbic, pamoic, sulfanilic, 2-acetoxybenzoic, fumaric, toluenesulfonic, methanesulfonic, ethane disulfonic, oxalic, isethionic, and the like.
- the pharmaceutically acceptable salts of the present invention can be synthesized from the compounds of formula I which contain a basic or acidic moiety by conventional chemical methods. Generally, the salts are prepared by reacting the free base or acid with stoichiometric amounts or with an excess of the desired salt-forming inorganic or organic acid or base in a suitable solvent or various combinations of solvents.
- the compounds of the present invention may have asymmetric centers and occur as racemates, racemic mixtures, and as individual diastereomers, with all possible isomers, including optical isomers, being included in the present invention.
- novel compounds of this invention are prepared by the following non-limiting procedures:
- the reaction is preferably carried out at room temperature (20- 30°C) at a pH in the range of 2-7 (acidic) by the addition of glacial acetic acid or hydrochloric acid.
- the reaction is preferably carried out at room temperature (20-30°C) at a pH in the range of 2-7 (acidic) by the addition of glacial acetic acid or hydrochloric acid.
- NHCO 2 CH 2 Ph NHCO 2 C(CH 3 ) 3 , NHCO 2 CH 3 , NHCO 2 CH 2 CH 3 or N 3 can be used as an intermediate.
- Deprotection by the usual methods hydrogenation or acidic hydrolysis followed by basification
- the preferred compounds can be obtained after isolation and purification.
- the more preferred trans -isomer is either formed selectively by control of the reaction
- novel starting materials of the formula (IV) can be obtained by conventional procedures such as those described in the Examples section.
- the starting materials of the formula (V) are either
- the reaction is preferably carried out at room temperature (20- 30°C) at a pH in the range of 2-7 (acidic) by the addition of glacial acetic acid or hydrochloric acid.
- CO 2 CH 2 CH 3 can be used as an intermediate.
- Deprotection by the usual methods hydrogenation or acidic hydrolysis followed by basification
- the more preferred trans -isomer is either formed selectively by control of the reaction conditions, or separated by chromatography.
- novel starting materials of the formula (IV) can be obtained by conventional procedures such as those described in the Examples section.
- the starting materials of the formula (VI) are either commercially available or can be obtained by conventional
- the reaction is preferably carried out at room temperature (20- 30°C) at a pH in the range of 2-7 (acidic) by the addition of glacial acetic acid or hydrochloric acid.
- Deprotection by the usual methods hydrogenation or acidic hydrolysis followed by basification
- the more preferred transisomer is either formed selectively by control of the reaction conditions, or separated by chromatography.
- novel starting materials of the formula (VII) can be obtained by conventional procedures such as those described in the Examples section.
- the starting materials of the formula (III) are either
- the compounds of the present invention include, but are not limited by the following Tables (1-4).
- the selectivity of the compounds can be measured by radioligand displacement from ml-m5 receptors expressed in Chinese hamster ovary cells (CKO) as described in the Examples section.
- the functional activity of the compounds can be assessed by measuring the agonist induced contractile response on muscle tissue from rabbit vas deferens (M 1 ), the guinea pig left atria (M2), or the guinea pig ileum (M3) as described in the Examples section.
- the functional activity at the human muscarinic receptors can be assessed by measuring agonist induced phosphoinositide hydrolysis in CHO cells expressing the human ml and m3 receptors or agonist inhibition of foskolin-stimulated adenylate cyclase activity in CHO cells expressing the human m2 receptor as described in the Examples section.
- the instant compounds of this invention are useful in treating and/or preventing the development of myopia. Therapy to inhibit axial-elongation myopia during maturation can be
- Eye drops are typically made up at a concentration of active agent between about 0.1 and 2% in the ophthalmic medium.
- a 0.5%-2% solution of the instant muscarinic antagonist in water would be a likely concentration for clinical use.
- a pH of about 4.5 to about 7.5 is expected to be acceptable as an ophthalmic drop and practical in terms of known solubility and stability of piperidines.
- Phosphate buffering is also common for eye drops and is compatible with the instant muscarinic antagonist.
- a common regimen for application of eye drops is one to three times a day spaced evenly throughout waking hours. More effective agents may require fewer applications or enable the use of more dilute solutions.
- ointments and solid inserts are now coming into increased use in clinical practice. These aid the ocular
- muscarinic antagonist might prevent or inhibit the development of permanent or persistent amblyopia in maturing humans with decreased likelihood of sensitization of the eye. It is also possible that humans who have already developed amblyopia from other or even unknown causes might be aided by similar therapeutic treatment with the aforementioned agents.
- Step 1 A mixture of 100 g 4-piperidone hydrochloride hydrate, 1 L ether, 300 mL of water, 500 mL of saturated aqueous
- Step 2 A mixture of 20.6 g N-t-butyloxycarbonyl-4-piperidone, 15 g of 4-(2-oxo-1-benzimidazolinyl)piperidine, 300 mL of 1 ,2-dichloroethane, 4.2 mL of glacial acetic acid and 24 g of sodium triacetoxyborohydride was stirred at room temperature for 48 h. The reaction mixture was poured into 500 mL chloroform and 500 mL saturated aqueous Na 2 CO 3 and the layers separated. The aqueous layer was extracted with 2 X 250 mL of chloroform and the combined organic layers dried over MgSO 4 and concentrated under reduced pressure.
- Step 3 A stirred solution of 4 g of 1,3-dihydro-1- ⁇ 1 -[ 1 -(t-butyloxycarbonyl)piperidin-4-yl]piperidin-4-yl ⁇ -2H-benzimidazol-2-one in 150 mL of 1N HCl was heated to reflux for 4 h, cooled and
- Step 4 To a stirred solution of 6 g of 1,3-dihydro-1 - ⁇ 1 -[ 1 -piperidin-4-yl]piperidin-4-yl ⁇ -2H-benzimidazol-2-one dihydrochloride salt and 20 mL of triethylamine in 500 mL of dichloromethane was added 3 g of pyrimidine-5-carboxylic acid chloride. After 2 h, 50 mL of dilute aqueous ammonia was added and the mixture stirred for an additional 30 min. The organic layer was separated, the aqueous layer extracted with two additional 200 mL portions of chloroform and the combined organic extracts dried over MgS O 4 and concentrated under reduced pressure.
- Step 1 A mixture of 69 g of 4-chloro-3-nitro-toluene, 50 g of ethyl 4-amino-1 -piperidinecarboxylate, 24 g of sodium carbonate, 0.1 g of sodium iodide and 120 mL of cyclohexanol was heated to 150°C for 72 h. After cooling the cyclohexanol was distilled off under reduced pressure and the residue partitioned between 1 L of ethyl acetate and 1 L of water. The organic extract was dried over MgSO 4 and
- Step 2 A mixture of 8.23 g of ethyl 4-(4-methyl-2-nitroanilino)-1-piperidinecarboxylate, 200 mL of tetrahydrofuran , 225 mL of ethanol and 2 g of 5% platinum on carbon was stirred under an atmosphere of hydrogen for 7 h. The catalyst was filtered off and the filtrate concentrated to to a thick oil.
- Step 3 A mixture of 5 g of ethyl 4-(5-methyl-2-oxo-1 -benzimidazolinyl)piperidine-1 -carboxylate and 20 mL of 2N NaOH was heated under reflux for 12 h. The resulting solution is cooled and stirred for for 30 minutes with 5 g of ammonium chloride and extracted with three 200 mL portions of chloroform. The combined organic extracts were dried over MgSO 4 , concentrated under reduced pressure and triturated with ether. The solid product 4-(5-methyl-2-oxo-1-benzimidazolinyl)piperidine weighed 3.5 g after drying.
- Step 4 A mixture of 4.5 g N-t-butyloxycarbonyl-4-piperidone, 4.7 g of 4-(5-methyl-2-oxo-1 -benzimidazolinyl)piperidine, 65 mL of 1 ,2-dichloroethane, 1.3 mL of glacial acetic acid and 6.4 g of sodium triacetoxyborohydride was stirred at room temperature for 48 h.
- the reaction mixture was poured into 500 mL chloroform and 500 mL saturated aqueous Na 2 CO 3 and the layers separated. The aqueous layer was extracted with 2 X 250 mL of chloroform and the combined organic layers dried over MgSO 4 and concentrated under reduced pressure.
- Step 5 A stirred solution of 6.18 g of 5-methyl-1,3-dihydro-1 - ⁇ 1 -[ 1 -(t-butyloxycarbonyl)piperidin-4-yl]piperidin-4-yl ⁇ -2H-benzimidazol-2-one in 200 mL of 1N HCl was heated to reflux for 4 h, cooled and concentrated to dryness. After drying overnight under vacuum, there was obtained 6 g of 5-methyl-1 ,3-dihydro-1 - ⁇ 1-[ 1 -piperidin-4-yl]piperidin-4-yl ⁇ -2H-benzimidazol-2-one dihydrochloride salt as a white solid.
- Step 6 To a stirred solution of 6 g of 5-methyl-1,3-dihydro-1 - ⁇ 1 -[ 1 -piperidin-4-yl]piperidin-4-yl ⁇ -2H-benzimidazol-2-one
- Step 1 A mixture of 10 g of 1 ,4-cyclohexanedione mono-ethyleneketal, 13.8 g of 1,2-phenylenediamine, 180 mL of 1 ,2-dichloroethane, 4 mL of glacial acetic acid and 19 g of sodium triacetoxyborohydride was stirred at room temperature for 48 h. The reaction mixture was poured into 200 mL chloroform and 200 mL saturated 1N NaOH and the layers separated. The aqueous layer was extracted with 2 X 50 mL of chloroform and the combined organic layers dried over MgSO 4 and concentrated to dryness under reduced pressure.
- Step 2 A mixture of 7 g of the ethylene ketal of 1 ,3-dihydro- 1 -(4-oxocyclohexyl)-2H-benzimidazol-2-one, 100 mL of glacial acetic acid, 50 mL of water and 50 mL of cone. HCl was heated under reflux for 12 h. The mixture was concentrated under reduced pressure, diluted with 100 mL of water and extracted into 3 X 200 mL of CHCl 3 . The combined organic extracts were washed with 100 mL of water, 100 mL of saturated Na 2 CO 3 . dried over MgSO 4 and concentrated under reduced pressure.
- Step 3 A mixture of 1.5 g of 1,3-dihydro-1 -(4-oxocyclohexyl)-2H-benzimidazol-2-one, 1.21 g of tert-butyl-1 -piperazinecarboxylate, 20 mL of 1,2-dichloroethane, 0.4 mL of acetic acid and 1.8 g of sodium triacetoxyborohydride was stirred at room temperature for 48 h. The reaction mixture was poured into 500 mL chloroform and 500 mL saturated aqueous Na 2 CO 3 and the layers separated. The aqueous layer was extracted with 2 X 250 mL of chloroform and the combined organic layers dried over MgSO 4 and concentrated under reduced pressure.
- Step 4 A stirred solution of 0.52 g of trans -1 ,3-dihydro-1 - ⁇ 4-[4-(tert -butyloxycarbonyl)piperazin-1-yl]-1-cyclohexyl ⁇ -2H-benzimidazol-2-one in 15 mL of 1N HCl was heated to reflux for 1 h, cooled, basified to pH 10 with 6N NaOH and extracted 2 ⁇ 50 mL of CHCl 3 . The combined extracts were dried over MgSO 4 and concentrated under reduced pressure.
- Step 5 To a stirred solution of 0.044 g of trans -1,3-dihydro-1 - ⁇ 4-(1 -piperazinyl)-1 -cyclohexyl ⁇ -2H-benzimidazol-2-one and 20 mL of triethylamine in 3 mL of dichloromethane was added 0.03 g of pyrimidine-5-carboxylic acid chloride. After 2 h, 5 mL of dilute aqueous ammonia was added and the mixture stirred for an additional 30 min. The organic layer was separated, the aqueous layer extracted with two addtional 20 mL portions of chloroform and the combined organic extracts dried over MgSO 4 and concentrated under reduced pressure.
- Step 1 To a stirred solution of 2.0 g of ethyl 4-amino- 1 -piperidinecarboxylate and 2 mL of triethylamine in 50 mL of
- Step 2 A mixture of 1.2 g of the ethylene ketal of 4-(3-pyridinecarbonylamino)- 1 -piperidinecarboxylate and 20 mL of 6N HCl was heated under reflux for 6 h. The mixture was cooled, extracted with 20 mL of dichloromethane, then basified with 6N NaOH and extracted with 3 X 50 mL of chloroform.
- Step 3 A mixture of 0.13 g of 1 ,3-dihydro-1 -(4-oxocyclohexyl)-2H-benzimidazol-2-one, 0.12 g of 4-(3-pyridinecarbonylamino)piperidine, 5 mL of 1 ,2-dichloroethane, 0.04 mL of glacial acetic acid and 0.161 g of sodium triacetoxyborohydride was stirred at room temperature for 48 h. The reaction mixture was poured into 50 mL chloroform and 50 mL saturated aqueous Na 2 CO 3 and the layers separated.
- Step 1 To a stirred solution of 0.108 g of 3-aminomethylpyridine and 0.280 g of di-2-pyridylcarbonate in 5 mL of dichloromethane was added 0.209 mL of triethylamine. After 12 h, the mixture was diluted with 50 mL of dichloromethane and washed with 50 mL of satutrated sodium bicarbonate, dried over MgSO 4 and concentrated under reduced pressure. The residue was filtered through a short column of silica gel , eluting with ethyl acetate ( 100 mL) and the eluate concentrated to dryness.
- Step 2 A mixture of 0.108 g of 1 ,3-dihydro- 1- ⁇ 1-[ 1-piperidin-4-yl]piperidin-4-yl ⁇ -2H-benzimidazol-2-one, 0.070 g of N-(3-pyridylmethyl)-O-2-pyridylurethane and 0.062 mL of triethylamine in 5 mL of dichloromethane was added 2.07 g of nicotinoyl chloride hydrochloride.
- Step 1 A mixture of 1.5 g of 1 ,3-dihydro-1 -(4-oxocyclohexyl)- 2H-benzimidazol-2-one, 1.21 g of tert-butyl 1 -piperazinecarboxylate, 20 mL of 1 ,2-dichloroethane, 0.40 mL of glacial acetic acid and 1.79 g of sodium triacetoxyborohydride was stirred at room temperature for 48 h. The reaction mixture was poured into 50 mL chloroform and 50 mL saturated aqueous Na 2 CO 3 and the layers separated.
- Step 2 A stirred solution of 0.52 g of 1 ,3-dihydro-l - ⁇ trans -4-[4-(tert -butylcarbonyl)piperazin-1 -yl]-1 -cyclohexyl ⁇ -2H-benzimidazol-2-one in 15 mL of 1N HCl was heated to reflux for 1 h, cooled and basified with 6N NaOH. The basic mixture was extracted with 2 X 50 mL portions of chloroform. The combined organic extracts were dried over MgSO 4 and concentrated under reduced pressure.
- Step 3 To a stirred solution of 0.044 g of 1,3-dihydro-1-[trans-4-[ 1-piperazinyl]-1 -cyclohexyl ⁇ -2H-benzimidazol-2-one and 0.2 mL of triethylamine in 3 mL of dichloromethane was added 0.030 g of pyrimidine-5-carboxylic acid chloride. After 2 h, 5 mL of dilute aqueous ammonia was added and the mixture stirred for an additional 30 min. The organic layer was separated, the aqueous layer extracted with two addtional 20 mL portions of chloroform and the combined organic extracts dried over MgSC ⁇ t and concentrated under reduced pressure.
- Step 1 A mixture of 1.5 g of 1,3-dihydro- 1 -(4-oxocyclohexyl)-2H-benzimidazol-2-one, 1.12 g of ethyl 4-amino-1 -piperidinecarboxylate, 20 mL of 1 ,2-dichloroethane, 0.40 mL of glacial acetic acid and 1.79 g of sodium triacetoxyborohydride was stirred at room temperature for 48 h. The reaction mixture was poured into 50 mL chloroform and 50 mL saturated aqueous Na 2 CO 3 and the layers separated.
- Step 2 A stirred solution of 1.2 g of 1,3-dihydro-1 - ⁇ trans -4-[ 1-ethoxycarbonyl-4-piperidinylamino]-1-cyclohexyl ⁇ -2H-benzimidazol-2- one in 20 mL of 6N HCl was heated to reflux for 12 h, cooled and basified with 6N NaOH. The basic mixture was extracted with 2 X 50 mL portions of chloroform. The combined organic extracts were dried over MgSO 4 and concentrated under reduced pressure.
- Step 3 To a stirred solution of 0.050 g of 1,3-dihydro-1- ⁇ trans-4-[4-piperidinylamino]-1-cyclohexyl ⁇ -2H-benzimidazol-2-one and 0.023 mL of triethylamine in 1.5mL of dichloromethane was added 0.024 g of nicotinoyl chloride hydrochloride. After 12 h, 20 mL of saturated sodium carbonate was added, the organic layer was separated, and the aqueous layer extracted with two addtional 20 mL portions of chloroform. The combined organic extracts dried over MgSO 4 and concentrated under reduced pressure. Chromatography over silica gel eluting with 10% methanol/10% cone.
- Step 1 A mixture of trans -4-aminocyclohexanol hydrochloride
- Step 2 To a stirred solution of oxalyl chloride (0.83 g) in dry dichloromethane (15 mL) at -60 °C was added dimethylsulfoxide (1.0 mL) in dichloromethane (3 mL) dropwise. The reaction mixture was stirred at -60 °C for 10 min, then N-tert -butyloxycarbonyl-trans -4- aminocyclohexanol (1.28 g) in dichloromethane (70 mL) was added over 15 min. The resulting mixture was stirred at -60 °C for a further 15 min, then triethylamine (4.2 mL) was added and the solution was allowed to warm to room temperature.
- Step 3 A mixture of N-tert -butyloxycarbonyl-4-aminocyclohexanone (1.32 g), 4-(2-keto-1-benzimidazolinyl)piperidine ( 1.48 g), sodium triacetoxyborohydride (1.97 g), acetic acid (0.35 mL), 1 ,2-dichloroethane (50 mL) and tetrahydrofuran (60 mL) was stirred at room temperature for 3 days. Saturated aqueous Na 2 CO 3 (30 mL) and H 2 O (30 mL) were added and the mixture was extracted with
- Step 4 The mixture of cis and trans isomers isolated in Step 3 (0.85 g) was stirred in ethyl acetate (100 mL) at 0 °C and gaseous HCl was bubbled in until the mixture was saturated with the acid. Stirring was continued for 20 min, then the reaction mixture was concentrated in vacuo. The residue was dissolved in chloroform, washed with saturated aqueous Na 2 CO 3 , and the organic layer was dried over MgSO 4 and evaporated under reduced pressure.
- Step 5 To the mixture of cis and trans isomers isolated in Step 4 (90 mg) was added tetrahydrofuran (3 mL), dimethylformamide (2 mL), triethylamine (0.12 mL) and nicotinoyl chloride hydrochloride (76 mg). The reaction mixture was stirred at room temperature for 18 h then concentrated to dryness under reduced pressure.
- Step 1 To 1 mL of benzyl alcohol cooled in an ice bath was added 0.1 g of 60% sodium hydride oil dispersion. After 15 min., 0.1 g of 6-chloro-2-pyrazinoic acid was added. The mixture was stirred at room temperature forl h, then acidified with 2 mL of 1 N HCl. The mixture was cooled in an ice bath and the white precipitate collected by filtration.
- Step 2 From 1,3-dihydro-1- ⁇ 1-[1 -piperidin-4-yl]piperidin-4-yl ⁇ -2H-benzimidazol-2-one dihydrochloride salt and 6-benzyloxy-2- pyrazinoic acid using the procedure described for Example 3, there was obtained 1 ,3-dihydro-1- ⁇ 1-[ 1-(6-benzyloxy-2-pyrazinecarbonyl)piperidin-4-yl]piperidin-4-yl ⁇ -2H-benzimidazol-2-one as a white solid: 1 H NMR (400 MHz, CDCI 3 ) 9.98 (s, 1H), 8.46 (m, 1H), 8.36 (m, 1H), 7.47-7.05 (m, 9H), 5.43 (m, 2H), 4.81 (br s, 1H), 4.39 (br s, 1H), 3.9 (br s, 1H), 2.85 (m, 1H), 2.65 (m, 1H), 2.46 (m, 4
- Step 1 A mixture of 0.15 g of 1,3-dihydro-1- ⁇ 1-[1-(6-chloro-2-pyrazinecarbonyl)piperidin-4-yl]piperidin-4-yl ⁇ -2H-benzimidazol-2-one, 0.26 g of sodium azide and 5 mL of anhydrous N,N-dimethylformamide was stirred for 24 h, then concentrated to dryness under reduced pressure. The residue was partitioned between 50 mL of chloroform and 5 mL of saturated sodium carbonate and the organic extracts dried over MgSO 4 .
- Step 2 The crude 1 ,3-dihydro-1- ⁇ 1 -[1-(6-azido-2-pyrazinecarbonyl)piperidin-4-yl]piperidin-4-yl ⁇ -2H-benzimidazol-2-one was hydrogenated under 1 atm. of hydrogen in 20 mL of ethanol over 0.05 g of 5% palladium on carbon. The catalyst was removed by filtration and the filtrate concentrated to dryness under reduced pressure. Preparative thin layer chromatography using 20%
- CDCI 3 9.25 (s, 1H), 8.90 (s, 2H), 7.98 (s, 1H), 7.61 (s, 1H), 7.3 (m, 1H), 7.1 -7.05 (m, 3H), 4.8 (m, 1H), 4.4 (m, 1H), 4.1 (m, 1H), 3.1 (m, 2H), 2.9 (m, 2H), 2.77-2.35 (m, 4H), 2.0-1.5 (m, 7H).
- CDCI 3 9.52 (s, 1H), 9.33 (s, 1H), 9.22 (m, 1H), 7.5 (m, 1H), 7.27 (m, 1H), 7.12-7.04 (m, 3H), 4.77 (m, 1H), 4.35 (br s, 1H), 3.6 (m, 1H), 3.1 (m. 2H), 2.9 (m, 1H), 2.65 (m, 1H), 2.44 (m, 4H), 2.1 (br s, 1H), 1.87 (m, 4H), 1.6 (m, 2H).
- the dihydrochloride salt was precipitated from ethanol/ether: Analysis calculated for C 22 H 26 N 6 O 2 ⁇ 0.62
- the dihydrochloride salt was precipitated from ethanol/toluene: Analysis calculated for C 24 H 30 N 6 O 2 ⁇ 1.6 H 2 O ⁇ 0.4 CH 3 C 6 H 5 : C: 56.16, H: 6.77, N: 14.66; found C: 56.18, H: 6.37, N: 14.69.
- Step 1 A mixture of 45 g of 2-aminomethylaniline, 60 g of di-tert -butyldicarbonate, 1000 mL of dichloromethane was stirred for 18 h and washed with 500 mL of 2N NaOH. The organic extract was dried over MgSO 4 and concentrated under reduced pressure. Drying under vacuum gave 47 g of 2-(tert -butoxycarbonylaminomethyl)aniline as a white crystalline solid.
- Step 2 A mixture of 15.5 g of 1- ⁇ tert -butoxycarbonyl
- Step 3 To a stirred solution of 27.1 g of tert -butyl 4-(2-tert-butoxycarbonylaminomethylanilino)-1 -piperidinecarboxylate and 30 mL of triethylamine in 400 mL of dichloromethane was added dropwise 60 mL of a 1.93 M solution of phosgene in toluene. After stirring for 12 h, 200 mL of 1N NaOH was added. The mixture was shaken, and the organic layer separated, dried over MgSO 4 and concentrated under reduced pressure.
- Step 4 A stirred solution of 25 g of 1 ,3-dihydro-1 -[1 -tert
- Step 5 A mixture of 0.52 g of 1 ,3-dihydro-1-[piperidin-4-yl]-1H-3,4-dihydroquinazolin-2-one, 0.65 g of N-t-butyloxycarbonyl-4-piperidone, 10 mL of 1 ,2-dichloroethane, 0.3 mL of glacial acetic acid and 1 g of sodium triacetoxyborohydride was stirred at room
- Step 6 A stirred solution of 0.9 g of 1 ,3-dihydro- 1 - ⁇ 1 -[1-(tert-butyloxycarbonyl)piperidin-4-yl]piperidin-4-yl ⁇ - 1 H-3,4-dihydroquinazolin-2-one in 40 mL of 1N HCl was heated to reflux for 6 h, cooled and concentrated to dryness. After drying overnight under vacuum, there was obtained 0.58 g of 1,3-dihydro-1 - ⁇ 1-[piperidin-4-yl]piperidin-4-yl ⁇ -1H-3,4-dihydroquinazolin-2-one dihydrochloride salt as a white solid.
- Step 7 To a stirred solution of 0.58 g of 1 ,3-dihydro-1- ⁇ 1- [piperidin-4-yl]piperidin-4-yl ⁇ -1H-3,4-dihydroquinazolin-2-one dihydrochloride salt and lmL of triethylamine in 50 mL of
- dichloromethane was added 0.3 g of pyrimidine-5-carboxylic acid chloride. After 2 h, 50 mL of dilute aqueous ammonia was added and the mixture stirred for an additional 30 min. The organic layer was separated, the aqueous layer extracted with two additional 50 mL portions of chloroform and the combined organic extracts dried over MgSO 4 and concentrated under reduced pressure.
- Step 1 To a stirred mixture of 1.1 g of 5-(1 -aminoethyl)pyrimidine (O. Cervinska and P. Malon, Coll. Czechoslov. Chem. Commun. 1977, 42 , 3464-72.), 17 mL of ethanol and 1.36 g of K 2 CO 3 heated to reflux was added dropwise over 30 min, a solution of 4 g of 1 ,1 -dimethyl-4oxopiperidinium iodide in 70 mL of water. When the addition was complete, the mixture was heated under reflux for an additional 2 h, cooled, basified to pH 9 with K 2 CO 3 and extracted with 5 times with 50 mL portions of methylene chloride. The combined organic extracts were dried over MgSO 4 and concentrated under reduced pressure.
- 5-(1 -aminoethyl)pyrimidine O. Cervinska and P. Malon, Coll. Czechoslov. Chem. Commun. 1977, 42 , 3464-72.
- Step 2 A mixture of 0.24 g of 1 -( 1-(5-pyrimidinyl)-ethyl)-4-oxopiperidine, 0.24 g of 1-(4-piperidinyl) benzimidazol-2H-one, 4 mL of 1 ,2-dichloroethane, 0.12 mL of glacial acetic acid and 0.45 g of sodium triacetoxyborohydride was stirred at room temperature for 48 h. The reaction mixture was poured into 100 mL dichloromethane and 25 mL saturated aqueous Na 2 CO 3 and the layers separated.
- the bis-maleate salt Analysis calculated for C 23 H 29 ClN 6 O ⁇ 2 C 4 H 4 O 4 : C:55.31, H: 5.54, N: 12.49; found C: 55.41, H: 5.54, N: 12.60.
- Step 1 A mixture of 5 g of 1 ,4-cyclohexanedione mono-ethyleneketal, 4.3 g of 1 ,3-dihydro-1 -(4-piperidinyl)-benzimidazol-2H-one, 75 mL of 1 ,2-dichloroethane, 1.2 mL of acetic acid and 5.45 g of sodium
- triacetoxyborohydride was stirred at room temperature for 48 h.
- the reaction mixture was poured into 500 mL chloroform and 500 mL saturated aqueous Na 2 CO 3 and the layers separated.
- the aqueous layer was extracted with 2 X 250 mL of chloroform and the combined organic layers dried over MgSO 4 and concentrated under reduced pressure.
- Step 2 A mixture of 7.0 g of the ethylene ketal of 1 ,3-dihydro-1 - ⁇ 1 -[4-oxocyclohex-1-yl]piperidin-4-yl ⁇ -2H-benzimidazol-2-one, 80 mL of glacial acetic acid, 80 mL of water and 20 mL of cone. HCl was heated under reflux for 2 h, then allowed to cool ovemight. The mixture was concentrated under reduced pressure, diluted with 100 mL of saturated Na 2 CO 3 and extracted into 3 X 200 mL of CHCl 3 . The combined organic extracts were dried over MgSO 4 and concentrated under reduced pressure.
- Step 1 A mixture of 0.10 g of trans -1 ,3-dihydro-1 - ⁇ 4-(1 - piperazinyl)-1 -cyclohexyl ⁇ -2H-benzimidazol-2-one, 0.037 mL of 3-pyridinecarboxaldehyde, 15 mL of 1 ,2-dichloroethane, 0.10 mL of glacial acetic acid and 0.1 1 g of sodium triacetoxyborohydride was stirred at room temperature for 24 h. The reaction mixture was poured into 10 mL dichloromethane and 10 mL saturated aqueous NaHCO 3 and the layers separated.
- Step 1 A mixture of ethyl 4-oxocyclohexanecarboxylate (1.86 g), 4-(2-oxo-1 -benzimidazolinyl)piperidine ( 1.98 g), 1 ,2-dichloroethane (40 mL), glacial acetic acid (0.52 mL) and sodium triacetoxyborohydride (3.47 g) was stirred at room temperature for 72 h. The reaction mixture was poured into dichloromethane (50 mL) and saturated
- Step 2 To a stirred solution of the cis and trans isomers of ethyl 1-[4-(2-keto-1 -benzimidazolinyl)piperidin- 1-yl]cyclohexane-4-carboxylate (2.16 g) in dry toluene (150 mL) at -90 °C under argon, was added diisobutylaluminum hydride (1 1.6 mL of a 1.5 M solution in toluene). The reaction mixture was stirred at -90 °C for 1h, then quenched with methanol (1 mL) followed by saturated sodium potassium tartrate (50 mL).
- Step 3 To a stirred solution of 5-bromopyrimidine (3.98 g) in 1 : 1 diethyl ether; tetrahydrofuran (120 mL) at -1 10 °C under argon, was added n-butyllithium (10.4 mL of a 1.6 M solution in hexanes) at such a rate that the temperature was maintained at -1 10 °C.
- Step 1 To a stirred solution of oxalyl chloride (68 mg) in dry
- Step 1 A mixture of 1 ,3-dihydro-1 - ⁇ 1 -[4-oxocyclohex-1 -yl]piperidin-4-yl ⁇ -2H-benzimidazol-2-one (200 mg), 3-aminopyridine (29 mg), 1 ,2-dichloroethane (1.5 mL), acetic acid (0.087 mL) and sodium
- Step 1 Sodium borohydride (0.69 g) was added in portions to a stirred solution of acetylpyrazine (1.49 g) in ethanol (300 mL) at 0 °C. The mixture was allowed to warm to room temperature and stirred for 20 min, then water (100 mL) was added and the mixture adjusted to pH 7 with 1 N hydrochloric acid. The neutralized solution was concentrated in vacua to a volume of 200 mL, saturated with sodium chloride, and extracted with ethyl acetate (3 X 500 mL). The organic extracts were dried (Na 2 SO 4 ) and concentrated to give a solid which was washed with dichloromethane (4 X 100 mL). The dichloromethane washings were concentrated to give 2-(1 -hydroxyethyl)pyrazine (1.38 g) as a colorless oil.
- Step 2 To a stirred solution of 2-( 1 -hydroxyethyl)pyrazine (0.859 g) and diphenylphosphoryl azide (2.48 g) in dry toluene (12 mL) at 0 °C, under argon, was added 1 ,8-diazabicyclo[5.4.0]undec-7-ene ( 1.35 mL) dropwise. The resulting mixture was allowed to warm slowly to room temperature and stirred for 22 h then quenched with water (8 mL). The organic layer was removed and the aqueous phase extracted with 10 mL ethyl acetate.
- Step 3 2-(1-Azidoethyl)pyrazine (0.77 g) and 10% palladium on carbon (0.075 g) were stirred in ethanol (40 mL) under an atmosphere of hydrogen at room temperature for 2 h. The mixture was filtered through a pad of celite and the filtrate concentrated under reduced pressure to yield 2-(1-aminoethyl)pyrazine (0.56 g) as a pale oil
- Step 4 To a stirred mixture of 2-(1 -aminoethyl)pyrazine (225 mg), ethanol (10 mL) and K 2 CO 3 (72 mg) heated to reflux was added dropwise over 30 min, a solution of 4 g of 1 ,1 -dimethyl-4-oxopiperidinium iodide (2.1 g) in water (36 mL). When the addition was complete, the mixture was heated under reflux for an additional 2 h, cooled, basified to pH 10 with Na 2 CO 3 and extracted with ethyl acetate (3 X 100 mL). The combined organic extracts were dried over MgSO 4 and concentrated under reduced pressure.
- Step 5 A mixture of 1 -(1-(2-pyrazinyl)-ethyl)-4-oxopiperidine (37 mg), 4-(2-oxo-1 -benzimidazolinyl)piperidine (41 mg), 1 ,2-dichloroethane (0.75 mL), glacial acetic acid (0.01 1 mL) and sodium triacetoxyborohydride (60 mg) was stirred at room temperature for 48 h. The reaction mixture was poured into dichloromethane (5 mL) and saturated aqueous Na 2 CO 3 (3 mL) and the layers separated.
- Step 1 Sodium borohydride (1.75 g) was added in portions to a stirred solution of ace tylpyri dine (12.1 g) in ethanol (100 mL) at 0 °C. The mixture was allowed to warm to room temperature and stirred for 20 min, then concentrated under reduced pressure to remove ethanol. The thick residue was diluted with 300 mL of dichloromethane, 25 mL of water and 5 mL of 20% NaOH. Thed aqueous layer was saturated with sodium chloride,and extracted with ethyl acetate (4 X 150 mL). The combined organic extracts were dried (MgSO 4 ) and concentrated.
- Step 2 A mixture of 5 g of 3-( 1-hydroxyethyl)pyridine, 80 mL of t-butylmethylether, 0.85 g of lipase from Pseudom ⁇ nas fluorescens on Celite® (30 wt%, prepared as described by D. Bianchi, P. Cesti and E. Battistel, J. Org. Chem. 1988, 53 , 5531 -34) and 2.0 mL of acetic anhydride was allowed to stir in a stoppered flask for 24 h. The mixture was filtered and concentrated under reduced pressure.
- Step 3 To a stirred solution of 1.7 g of 3-(1 'S-hydroxyethyl)pyridine and 4.7 g of diphenylphosphoryl azide 20 mL of dry tetrahydrofuran cooled to 0 °C, was added 3.4 g of 1 ,8-diazabicyclo[5.4.0]undec-7-ene. The resulting mixture was allowed to warm to room temperature for 48 h., then loaded on a 10 ⁇ 15 cm column of silica gel.
- Step 5 To a stirred mixture of 1.5 g of 3-( 1 'R-aminoethyl)pyridine, 50 mL of ethanol and 1.54 g of K 2 CO 3 heated to reflux was added dropwise over 40 min a solution of 4.5 g of 1 -ethyl-1 -methyl-4-oxopiperidinium iodide in water (80 mL). When the addition was complete, the mixture was heated under reflux for an additional 30 min, cooled and extracted with 3 X 100 mL portions of chloroform. The combined organic extracts were dried over MgSO 4 and concentrated under reduced pressure.
- Step 6 A mixture of 1 -( 1'R-(3"-pyridinyl)-ethyl)-4-oxopiperidine (250 mg), 4-(2-oxo-1 -benzimidazolinyl)piperidine (530 mg), 1 ,2-dichloroethane (7 mL), glacial acetic acid (0.2 mL) and sodium
- the citrate salt Analysis calculated for C 24 H 31 N 5 O ⁇ 1.5 C 6 H 8 O 7 : C: 57.13, H: 6.25, N: 10.10 found C: 57.48, H: 6.39, N: 10.35.
- Step 1 To a stirred solution of 4.06 g of 5-pyrimidineacetic acid (F. Zymalkowski and E. Reimann, Arch. Pharm. 1966 299 362-7) and triethylamine (6.55 g) in methylene chloride (150 mL) at 0 °C was added ethyl chloroformate (6.38 g) followed by 4-dimethylaminopyridine (0.72 g). The mixture was stirred at 0 °C for 1 h, then the solution was diluted with methylene chloride (200 mL) and saturated ammonium chloride ( 150 mL) was added. After removal of the organic phase, the aqueous layer was extracted with methylene chloride (2 X 200 mL) and the combined organic extracts were dried over MgSO 4 and concentrated to give 7.33 g of a crude oil.
- 5-pyrimidineacetic acid F. Zymalkowski and E. Reimann, Arch. Pharm. 1966 299 362-7
- Step 3 A mixture of ethyl 2-methyl-2-(5-pyrimidinyl)propionate (4.64 g), 1.0 N lithium hydroxide (26 mL) and THF ( 100 mL) was heated to reflux under argon for 26 h. The mixture was allowed to cool, adjusted to pH 7 with acetic acid, and concentrated to dryness to give 4.1 1 g of lithium 2-methyl-2-(5-pyrimidinyl)propionate as a pale solid.
- Step 4 A mixture of lithium 2-methyl-2-(5-pyrimidinyl)propionate (4.1 1 g), diphenylphosphoryl azide (13.2 g), triethylamine (4.86 g) and anhydrous tert-butyl alcohol (100 mL) was heated to reflux for 6 h, then allowed to cool and concentrated in vacuo. The residue was partitioned between chloroform (250 mL) and water ( 100 mL), and the chloroform was extracted, dried (MgSO 4 ) and evaporated under reduced pressure. Chromatography on silica gel, eluting with
- Step 5 The crude 2-(5-pyrimidinyl)-2-propylisocyanate was treated with a mixture of 1.0 N sodium hydroxide (26 mL), water (20 mL) and THF ( 100 mL) at 0 °C for 30 min, then the mixture was poured into ethyl acetate (200 mL) and water (100 mL). The aqueous layer was acidified to pH 5 with 10% citric acid, extracted twice with ethyl acetate, and then adjusted to pH 1 1 , saturated with sodium chloride, and extracted with methylene chloride (3 X 250 mL). The combined methylene chloride extracts were dried (Na 2 SO 4 ) and concentrated in vacuo to give 2-(5-pyrimidinyl)-2-propylamine (950 mg) as a colorless oil.
- Step 6 To a stirred mixture of 2-(5-pyrimidinyl)-2-propylamine (660 mg), ethanol (9 mL) and K 2 CO 3 (665 mg) heated to reflux was added dropwise over 30 min, a solution of 1 ,1-dimethyl-4-oxopiperidinium iodide (1.9 g) in water (36 mL). When the addition was complete, the mixture was heated under reflux for an additional 2 h, cooled, basified to pH 10 with Na 2 CO 3 and extracted with ethyl acetate (3 ⁇ 100 mL). The combined organic extracts were dried over MgSO 4 and
- Step 7 A mixture of 1 -(2-(5-pyrimidinyl)-prop-2-yl)-4-oxopiperidine ( 1 17 mg), 4-(2-oxo-1 -benzimidazolinyl)piperidine ( 128 mg), 1 ,2-dichloroethane (2.5 mL), glacial acetic acid (0.031 mL) and sodium triacetoxyborohydride ( 170 mg) was stirred at room temperature for 48 h. The reaction mixture was poured into dichloromethane (15 mL) and saturated aqueous Na 2 CO 3 (8 mL) and the layers separated.
- the dihydrochloride salt Analysis calculated for C 22 H 29 CI 2 N 5 O 3 S ⁇ 2 HCl ⁇ 0.8 C 7 H 8 ⁇ 2.0 H 2 O C: 53.10, H: 6.36, N: 11.22 found C: 53.02, H: 6.40, N: 11.15.
- Step 1 A mixture of 0.65 g of ethyl 2-amino-5-pyrimidinecarboxylate (P. Schenone, L. Sansebastiano and L. Mosti, J. Heterocyclic Chem., 1990, 27 , 295-305) , 1.7 g of di-tert-butyldicarbonate and 50 mL of dichloromethane was allowed to stir overnight then concentrated under reduced pressure.
- ethyl 2-amino-5-pyrimidinecarboxylate P. Schenone, L. Sansebastiano and L. Mosti, J. Heterocyclic Chem., 1990, 27 , 295-305
- 1.7 g of di-tert-butyldicarbonate and 50 mL of dichloromethane was allowed to stir overnight then concentrated under reduced pressure.
- Step 3 From 1,3-dihydro-1 - ⁇ 1 -[ 1-piperidin-4-yl]piperidin-4-yl ⁇ -2H-benzimidazol-2-one dihydrochloride salt and 2-tert-butoxycarbonylamino-5-pyrimidinecarboxylic acid using the procedure described for Example 3, there was obtained 1 ,3-dihydro- 1 - ⁇ 1 -[ 1 -(2-tert-butoxycarbonylamino-5-pyrimidinecarbonyl)piperidin-4-yl]piperidin-4-yl ⁇ -2H-benzimidazol-2-one as a solid: 1 H NMR (400 MHz, CDCl 3 ) 9.95 (m, 1H), 8.81 (s, 2H), 7.28 (m, 2H), 7.08 (m, 2H), 4.77 (s, 1H), 4.35 (m, 1H), 3.80 (s, 1H), 3.12 (m, 4H). 2.88 (m, 1H), 2.68 (m, 1
- Step 4 The 1 ,3-dihydro-1- ⁇ 1 -[ 1 -(2-tert-butoxycarbonylamino-5-pyrimidinylcarbonyl)piperidin-4-yl]piperidin-4-yl ⁇ -2H-benzimidazol-2-one was dissolved in ethyl acetate, cooled to -50°C and treated with a stream of HCl gas for 2 min. The reaction mixture was allowed to warm to room temperature and stir for several hours, and then concentrated to dryness under reduced pressure.
- Step 1 To a stirred solution of 1,3-dihydro-1- ⁇ 1-[4-oxocyclohex-1-yl]piperidin-4-yl ⁇ -2H-benzimidazol-2-one (100 mg) in methanol (4 mL) at 0°C, under nitrogen, was added tert-butylamine-borane (28 mg). The reaction mixture was stirred at 0°C for 1 h, then quenched with water (2 mL) and concentrated to remove the methanol.
- the resulting oil was dissolved in ethyl acetate (50 mL) and the organic solution was washed with saturated sodium carbonate (10 mL), then water (10 mL), then brine (10 mL) and then dried over sodium sulfate.
- hydrochloride salt was precipitated from diethyl ether/chloroform:
- Step 1 To a stirred solution of 1,3-dihydro-1- ⁇ 1-[4-oxocyclohex-1-yl]piperidin-4-yl ⁇ -2H-benzimidazol-2-one (100 mg) in dry
- CHO cells When 80- 100% confluent, CHO cells were harvested, and transferred to centrifuge tubes containing CHO buffer (20 mM HEPES at pH 7.4 containing 5mM MgCl 2 ). The cells were
- the homogenate was centrifuged at 40,000 ⁇ g for 15 minutes at 4°C in a Beckman J2-21 M centrifuge.
- membranes were resuspended in CHO buffer to a concentration of one flask harvested (75 cm 2 ) per mL of buffer, mixed well and aliquoted in cryovials ( 1mL/vial). The vials were stored at -70°C until used in the assay. The binding incubation was done in
- polypropylene macrowell tube strips in a final volume of 0.5 mL of HEPES buffer (20 mM; pH 7.4 containing 5 mM MgCl 2 ) containing 0.1 mL of cell membrane suspension, 3H-N-methylscopolamine (NEN Corporation, NET-636, 70-87 C i /mmole) at a final volume of 0.5 mL of HEPES buffer (20 mM; pH 7.4 containing 5 mM MgCl 2 ) containing 0.1 mL of cell membrane suspension, 3H-N-methylscopolamine (NEN Corporation, NET-636, 70-87 C i /mmole) at a final
- K i values were calculated using the program LIGAND.
- Compounds displayed K i values at m1 , m2 and m4 in the range of InM to 5,000 nM. All compounds described herein displayed typically greater than 300-fold less potency at the m3 receptor subtype, in the range of 300 nM to 1 14,000 nM.
- tissue segments are attached to platinum electrodes with 4-0 surgical silk and placed in a 10 mL jacketed tissue bath containing Krebs buffer at 30°C, bubbled with 5% CO 2 / 95% O 2 .
- the tissues are connected to a Statham-Gould force transducer; 0.75 gram of tension is applied and the tissues are electrically stimulated.
- EFS parameters are 0.05 Hz; 0.5 ms duration; voltage is set to 30% of 50 V at 25 ohms and increased until a supramaximal voltage is achieved.
- the contractions are recorded on a Gould strip chart recorder. The tissues are washed every 20 minutes and allowed to equilibrate.
- a concentration response curve to the selective ml receptor agonist McN-A-343 is determined. Tissues are washed every 20 minutes for 60 minutes. The vehicle or compound is added to the bath and the tissues are incubated for 30 minutes, then the McN-A-343 concentration response is repeated. EC 50 values are determined for both vehicle and tissues treated with the compound before and after treatment. Antagonist dissociation constants (K b ) are calculated by the dose-ratio method. Compounds displayed K b values at m l generally consistent with the radioligand binding assay described in Example 30 in the range of 5 to 100 nM.
- dextrose 1 1 mM warmed to 37°C.
- Each atria is attached to platinum electrodes with 4-0 surgical silk and placed in a 10 mL jacketed tissue bath containing Krebs buffer at 37°C, bubbled with 5% CO 2 / 95% O 2 .
- the tissues are connected to a Statham-Gould force transducer; 0.75 gram of tension is applied and the tissues are electrically stimulated. [EFS parameters are 3 Hz; 4 ms duration; voltage is set to 5 V.]
- the contractions are recorded on a Gould strip chart recorder.
- the tissues are washed every 20 minutes and allowed to equilibrate.
- a concentration response curve to the agonist carbachol is determined. Tissues are washed every 20 minutes for 60 minutes. The vehicle or compound is added to the bath and the tissues are incubated for 30 minutes, then the carbachol
- Antagonist dissociation constants are calculated by the dose-ratio method.
- Compounds displayed K b values at M2 generally consistent with the radioligand binding assay described in Example 30 in the range of 5 to 100 nM.
- the lumen of the remainder is flushed with oxygenated Krebs solution [NaCl, 1 18 mM; KCl, 4.7 mM; CaCl 2 , 2.5 mM: KH 2 PO 4 , 1.2 mM; MgSO 4 , 1.2 mM; NaHCO 3 , 25 mM; dextrose, 1 1 mM] warmed to 30°C.
- the ileum is cut into 2.5 cm segments and each segment is mounted on a glass pipette.
- a scalpel is used to lightly cut the surface of the tissue and a cotton swab used to tease the longitudinal muscle free from the underlying circular muscle.
- EC 50 values are determined for both vehicle and tissues treated with the compound before and after treatment.
- Antagonist dissociation constants (K b ) are calculated by the dose-ratio method.
- Compounds displayed K b values at M3 generally consistent with the radioligand binding assay described in Example 30 in the range of 3900 to 24000 nM.
- EXAMPLE 72 ml and m3 receptor antagonist activity on the human muscarinic receptors expressed in CHO cells
- Preconfluent CHO cells were labeled for 24 hours with 4 ⁇ Ci/mL of [ 3 H] myo-inositol (specific activity 15-20 Ci /mmole).
- the cells were detached from flasks using 1 mM EDTA in phosphate buffer saline, centrifuged for 5 minutes at 200x g, and resuspended in assay buffer (1 16 mM NaCl; 10 mM LiCl; 4.7 mM KCl; 1.2 mM MgSO 4 ; 2.5 mM CaCl 2 ; 1.2 mM KH 2 PO 4 ; 5 mM NaHCO 3 ; 1 1 mM dextrose, 20 mM HEPES; pH 7.4 at 37°C) to the desired volume.
- K b values were generated by performing carbachol concentration-response curves in the absence and presence of a fixed concentration of compound.
- Compounds displayed K b values at ml and m3 generally consistent with the radioligand binding assay described in Example 30 in the range of 1 to 100 nM at m 1 and 4,000 to 20,000 at m3.
- Preconfluent CHO cells were harvested using 1 mM
- Muscarinic agonist 50 microliters of carbachol; 1 micromolar final concentration
- 20 microliters of 200 ⁇ M forskolin was then added followed by 20 microliters of 200 ⁇ M forskolin and the tubes were incubated at 30°C for an additional 15 minutes.
- the reaction was stopped by placing the tubes in boiling water for 5 minutes.
- the tubes were cooled on ice and then centrifuged at 12,000 xg for 10 minutes. Fifty microliters of each supernatant was then analyzed for cAMP using a commercially available radioimmunoassay kit following the manufacturer's instructions.
- K b values were generated by performing carbachol concentration-response curves in the absence and presence of a fixed concentration of compound.
- Compounds displayed K b values at m2 generally consistent with the radioligand binding assay described in Example 30 in the range of 1 to 100 nM.
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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AU39674/95A AU701127B2 (en) | 1994-10-27 | 1995-10-24 | Muscarine antagonists |
EP95937615A EP0786997A4 (en) | 1994-10-27 | 1995-10-24 | Muscarine antagonists |
JP51469196A JP2002515008A (en) | 1994-10-27 | 1995-10-24 | Muscarinic antagonist |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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US08/329,757 US5574044A (en) | 1994-10-27 | 1994-10-27 | Muscarine antagonists |
US08/440,153 US5691323A (en) | 1995-05-12 | 1995-05-12 | Muscarine antagonists |
US440,153 | 1995-05-12 | ||
US329,757 | 1995-05-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996013262A1 true WO1996013262A1 (en) | 1996-05-09 |
Family
ID=26986957
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1995/013710 WO1996013262A1 (en) | 1994-10-27 | 1995-10-24 | Muscarine antagonists |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0786997A4 (en) |
JP (1) | JP2002515008A (en) |
AU (1) | AU701127B2 (en) |
CA (1) | CA2200468A1 (en) |
WO (1) | WO1996013262A1 (en) |
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AU3967495A (en) | 1996-05-23 |
CA2200468A1 (en) | 1996-05-09 |
EP0786997A1 (en) | 1997-08-06 |
EP0786997A4 (en) | 1998-03-11 |
JP2002515008A (en) | 2002-05-21 |
AU701127B2 (en) | 1999-01-21 |
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