Classifications

• • 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
  • C07D403/04—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 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
  • A61P25/00—Drugs for disorders of the nervous system
• • 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
  • C07D403/06—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 carbon chain containing only aliphatic carbon atoms

Definitions

• the present invention relates to the field of medicine. More specifically, the present invention relates to compounds that are sigma- 1 receptor agonists and their use for the treatment of central nervous system disorders, including cognitive or neurodegenerative disorders, such as Alzheimer’s disease, Parkinson's disease, Huntington's disease, Amyotrophic lateral sclerosis, and multiple sclerosis.
• central nervous system disorders including cognitive or neurodegenerative disorders, such as Alzheimer’s disease, Parkinson's disease, Huntington's disease, Amyotrophic lateral sclerosis, and multiple sclerosis.
• the sigma- 1 receptor is a membrane-associated protein, found throughout the body and widely expressed in the central nervous system, neurons, astrocytes, oligodendrocytes and microglia.
• the sigma- 1 receptor is a single polypeptide transmembrane protein comprising 223 amino acids. As a single 25 kD polypeptide and chaperone protein, it is highly expressed at the mitochondria-associated endoplasmic reticulum (ER) membranes and plasma membranes.
• ER mitochondria-associated endoplasmic reticulum
• partner proteins are the glucose-related protein 78/binding immunoglobulin protein (BiP) and the inositol- 1,4, 5 trisphosphate (IP3) receptor.
• the sigma-1 receptor is a ligand-operated chaperone protein, that binds and is activated/inactivated by diverse classes of pharmacological compounds, including for instance the dextrogyre isomers of bezomorphans, such as (+)-pentazocine and (+)-SKF- 10,047.
• dextrogyre isomers of bezomorphans such as (+)-pentazocine and (+)-SKF- 10,047.
• endogenous ligands have been identified interacting with the sigma- 1 receptor, such as neuro(active)steroids, neuropeptides, choline or trace amines, the existence of a high-affinity endogenous sigma- 1 receptor ligand is still unclear.
• Activation of the sigma- 1 receptor by agonist has several cellular consequences but mainly results in an amplification of calcium exchanges between the ER and mitochondria, by interacting with the IP3 receptor on ER membranes, and in the induction of ER stress pathways, by interacting with ER stress sensors such as BiP or IRE-1.
• Sigma- 1 receptor agonists have been reported as having antidepressant effects in several animal models.
• the selective si receptor agonists (+)-pentazocine, (+)-SKF-l 0,047, igmesine, OPC14523, DTG or SA4503 reduce freezing in the conditioned fear stress test or immobility time in the forced swim test or are active in the tail suspension test (Matsuno et al., Eur J Pharmacol 312:267-71, 1996; Tottori et al. Neuropharmacology 2001 41:976-88; Urani et al., J Pharmacol Exp Ther 298:1269-79, 2001).
• Sigma-1 receptor agonists are also believed useful in improving cognitive impairment such as exhibited with impaired neurotransmitter function (e.g acetylcholine) as well as age associated cognitive impairment, and anxiety associated impairment (including pregnancy stress resulting in learning deficits of offspring).
• impaired neurotransmitter function e.g acetylcholine
• age associated cognitive impairment e.g acetylcholine
• anxiety associated impairment including pregnancy stress resulting in learning deficits of offspring
• Agonists of the sigma- 1 receptor are effective anti-amnesic compounds. This has been demonstrated in a number of pharmacological and pathological models of learning and memory impairment in rodents.
• sigma- 1 receptor agonists are routinely validated in vivo against scopolamine-induced learning deficits, a model of muscarinic acetylcholine receptor (mAChR) blockade.
• mAChR muscarinic acetylcholine receptor
• the sigma-1 receptor agonists LS-1-137 (Malik et al., Br J Pharmacol 172:2519-31, 2015), the sigma-1 positive modulators E1R (Zvejniece et al., Br J Pharmacol 171:761-71, 2014) or OZP002 (Maurice et al., Pharmacol Res 144:315-30, 2019) or the mixed mAChR/si agonists ANAVEX1-41 or ANAVEX2-73 (blarcamesine), two diphenyl- 3-furanmethanamine derivatives (Espallergues et al., Br J Pharmacol 152:267-79, 2017; Villard et al.
• E1R Zajniece et al., Br J Pharmacol 171:761-71, 2014
• OZP002 Maurice et al., Pharmacol Res 144:315-30, 2019
• Neuropsychopharmacology 34:1552-66, 2009 have recently been characterized as anti amnesic drugs against scopolamine-induced learning impairments.
• the efficacy of sigma- 1 receptor agonists as symptomatic drugs in cognition has been described not only in cholinergic amnesia models (e.g., scopolamine, mecamylamine, /?-chloroamphetamine, forebrain lesions) but also in glutamatergic models of learning deficit.
• sigma- 1 receptor agonists in alleviating dizocilpine-induced learning impairment also points to the potential utility of these drugs in treating schizophrenia-related cognitive deficits, in particular since hypoglutamatergy models have been considered as highly pertinent for mimicking the negative symptoms of schizophrenia (Meltzer et al., Int JNeuropsychopharmacol 16:2181-94, 2013).
• sigma-1 receptor ligands tested in both the scopolamine and dizocilpine models showed a similar active dose-range in vivo.
• Activation of the sigma-1 receptor therefore appeared to similarly modulate the activity of the two neurotransmission systems involved in memory processes in the limbic and cortical structures, namely cholinergic and particularly glutamatergic systems.
• the sigma- 1 receptor agonists enhance NMDA-induced firing in the hippocampus at very low doses.
• (+)-SKF- 10,047 also known as Alazocine
• PRE084 and (+)-pentazocine increased the expression of the NR2A and NR2B subunits of NMDA receptor, as well as PSD95 (also known as SAP-90), in the rat hippocampus.
• the sigma- 1 receptor agonist treatment leads to increased interaction between NR2 subunits and sigma-1 receptors and promotes trafficking of NMDA receptors to the cell surface.
• the sigma- 1 receptor interacts with NMDA receptors through the regulation of a small conductance Ca 2+ -activated K + current (SK channels).
• SK channels small conductance Ca 2+ -activated K + current
• the sigma- 1 receptor agonists are therefore promising symptomatic drugs in rodent models of cognitive alterations related to pathological ageing and neurodegenerative diseases.
• igmesine and PRE-084 in the low mg/kg dose-range, improved learning ability in the senescence-accelerated mouse SAMP/8 (Maurice et al. Brain Res 733:219-30, 1996).
• these compounds also alleviated the memory deficits induced by amyloid toxicity in pharmacological models of Alzheimer's disease (AD).
• (+)-pentazocine, PRE-084, cutamesine, dimemorphan, ANAVEX1-41, blarcamesine, OZP002 and the sigma- 1 receptor binding neuroactive steroids attenuated the learning deficits in mice that received a direct intracerebroventricular injection of oligomerized Ab25-35 peptide, which produces neurotoxicity closely related to AD pathology (Meunier et al., Br J Pharmacol. 149: 998-1012, 2006; Villard et al., J Psychopharmacol 25: 1101-17, 2011; Maurice et al., Pharmacol Res 144:315-30, 2019).
• All sigma- 1 receptor agonists or positive modulators alleviated the Ap25-35-induced learning impairments in spatial or nonspatial tasks involving short-term as well as long-term memory. These effects were blocked by BD1047, haloperidol, BMY-14,802, and progesterone, all putative sigma-1 receptor antagonists. Of note, whereas they blocked sigma-1 receptor agonist effects, the antagonists alone did not alter behavior (positively or negatively) in these models.
• the sigma- 1 receptor agonists are thus promising agents to treat AD symptoms, with active doses similar to or lower than the reference drugs donepezil, rivastigmine, galantamine, and memantine (Meunier et al., Br J Pharmacol 149: 998-1012, 2006).
• blarcamesine which is a mixed muscarinic and sigma- 1 drug, has successfully completed a phase 2 clinical trial in AD.
• sigma- 1 receptor agonists for the treatment of cognitive disorders related to psychiatric pathologies, neurodegenerative diseases, such as Alzheimer, Huntington and Parkinson diseases, amyotrophic lateral sclerosis (ALS) or multiple sclerosis, and genetic diseases associated with MAM (Mitochondria Associated Membranes) dysfunctions.
• the present invention seeks to meet this and other needs.
• Compounds according to the invention have been found to have affinity for sigma- 1 receptors.
• the present invention relates to a compound having the following formula (I): wherein:
• Ri and R2 represent independently:
• SR being alkyl, aryl or aralkyl; wherein one of Ri and R2 is H, and the other one of Ri and R2 is different from H;
• X and Y are either, respectively:
• R 4 represents H or a (Ci-C 4 )alkyl; n is 0, 1, or 2; m is 0 or 1; m’ is 0 or 1;
• R3 represents:
• R5 represents H or OH; and each of R6 represents independently H or a (Ci-Ce)alkyl group; an isomer, a solvate or any pharmaceutical salt thereof.
• composition comprising a compound as defined above, and a pharmaceutically acceptable support.
• Another object of the invention is a compound or pharmaceutical composition as defined above, for use in the treatment of disorder modulated by sigma- 1 receptor, including cognitive or neurodegenerative disorders.
• said disorder is selected from the group consisting of (1) neurodegenerative diseases such as Alzheimer disease, Parkinson's disease, Huntington's disease, Amyotrophic lateral sclerosis, multiple sclerosis; (2) cognitive and memory alterations such as pathological ageing, ischemic amnesia, schizophrenia-related cognitive deficits and depression; (3) developmental cognitive disorders such as autism-related disorders and mental retardation-related disorders; and (4) genetic diseases associated with MAM dysfunctions.
• C1-C3, C1-C6 or C2-C6 can also be used with lower numbers of carbon atoms such as C1-C2, C1-C5, or C2-C5.
• C1-C3 it means that the corresponding hydrocarbon chain may comprise from 1 to 3 carbon atoms, especially 1, 2 or 3 carbon atoms.
• C1-C6 it means that the corresponding hydrocarbon chain may comprise from 1 to 6 carbon atoms, especially 1, 2, 3, 4, 5 or 6 carbon atoms.
• C2-C6 it means that the corresponding hydrocarbon chain may comprise from 2 to 6 carbon atoms, especially 2, 3, 4, 5 or 6 carbon atoms.
• alkyl refers to a saturated, linear or branched aliphatic group.
• (Ci- C3)alkyl more specifically means methyl, ethyl, propyl, or isopropyl.
• (Ci-C6)alkyl more specifically means methyl, ethyl, propyl, isopropyl, butyl, isobutyl, ieri-butyl, pentyl or hexyl.
• the “alkyl” is a methyl, an ethyl, or a propyl, more preferably a methyl or an ethyl.
• the alkyl group includes halogenated alkyl group, such as perhalogenated alkyl (e.g. -CF3)
• alkenyl refers to an unsaturated, linear or branched aliphatic group comprising at least one carbon-carbon double bound.
• (C2-C6)alkenyl more specifically means ethenyl, propenyl, isopropenyl, butenyl, isobutenyl, pentenyl, prenyl or hexenyl.
• the “alkenyl” is an isobutenyl.
• Isobutenyl refers to a 2-methylprop-l-en-l-yl group.
• alkoxy or “alkyloxy” corresponds to the alkyl group as above defined bonded to the molecule by an -O- (ether) bond.
• (Ci-C3)alkoxy includes methoxy, ethoxy, propyloxy, and isopropyloxy.
• (Ci-Ce)alkoxy includes methoxy, ethoxy, propyloxy, isopropyloxy, butyloxy, isobutyloxy, ieri-butyloxy, pentyloxy and hexyloxy.
• the “alkoxy” or “alkyloxy” is a methoxy.
• cycloalkyl corresponds to a saturated or unsaturated (preferably at least one double carbon-carbon bond) mono-, bi- or tri-cyclic alkyl group having between 3 and 20 atoms of carbons (also named (C3-C2o)cycloalkyl). It also includes fused, bridged, or spiro-connected cycloalkyl groups.
• cycloalkyl includes for instance cyclopropyl, cyclobutyl, cyclopentyl, and cyclohexyl.
• cycloalkyl may also refer to a 5-10 membered bridged carbocyclyl such as bicyclo[2,2,l]heptanyl, bicyclo[2,2,2]octanyl, or adamantyl, preferably bicyclo[2,2,2]octanyl.
• the “cycloalkyl” is a cyclopropyl, cyclopentyl or a cyclohexyl.
• heterocycloalkyl corresponds to a saturated or unsaturated (preferably at least one double carbon-carbon bond) cycloalkyl group as above defined further comprising at least one heteroatom or heteroatomic group such as nitrogen, oxygen, or sulphur atom. It also includes fused, bridged, or spiro-connected heterocycloalkyl groups.
• heterocycloalkyl groups include, but are not limited to 3-dioxolane, benzo [1,3] dioxolyl, pyranyl, tetrahydropyranyl, thiomorpholinyl, pyrazolidinyl, piperidyl, piperazinyl, azepanyl, 1,4- dioxanyl, imidazolinyl, pyrrolinyl, pyrrolidinyl, piperidinyl, imidazolidinyl, morpholinyl, 1,4- dithianyl, pyrrolidinyl, quinolizinyl, oxozolinyl, oxazolidinyl, isoxazolinyl, isoxazolidinyl, thiazolinyl, thiazolidinyl, isothiazolinyl, isothiazolidinyl, dihydropyranyl, tetrahydro-2H- pyranyl, tetra
• heterocycloalkyl may also refer to a 5-10 membered bridged heterocyclyl such as 7-oxabicyclo[2,2,l]heptanyl.
• the heterocycloalkyl is azepanyl, piperidinyl, pyrrolidinyl or tetrahydropyranyl .
• aryl corresponds to a mono- or bi-cyclic aromatic hydrocarbons having from 6 to 14 carbon atoms (also named (C6-Ci4)aryl).
• aryl includes phenyl, or naphthyl.
• the aryl is a phenyl.
• heteroaryl refers to an aromatic, mono- or poly-cyclic group comprising between 5 and 14 atoms and comprising one or more heteroatoms, such as nitrogen (N), oxygen (O) or sulphur (S) atom, or heteroatomic groups.
• Examples of such mono- and poly-cyclic heteroaryl group may be: pyridinyl, thiazolyl, thiophenyl, furanyl, pyrrolyl, imidazolyl, triazolyl, tetrazolyl, benzofuranyl, thianaphthalenyl, indolyl, indolinyl, quinolinyl, isoquinolinyl, benzimidazolyl, triazinyl, thianthrenyl, isobenzofuranyl, phenoxanthinyl, isothiazolyl, isoxazolyl, pyrazinyl, pyridazinyl, indolizinyl, isoindolyl, indazolyl, purinyl, phtalazinyl, naphthyridinyl, quinoxalinyl, quinazolinyl, cinnolinyl, pteridinyl, carbazolyl,
• heterocycle or “heterocyclic group” corresponds to a saturated or unsaturated, alicyclic or aromatic, mono- or poly-cyclic, hydrocarbon which contains one or more heteroatoms, such as oxygen (O), nitrogen (N) or sulphur atom (S), and optionally comprising one or more oxo groups.
• heteroatoms such as oxygen (O), nitrogen (N) or sulphur atom (S), and optionally comprising one or more oxo groups.
• Heterocycles include, but are not limited to, heteroaryl, heterocycloalkyl, and other heterocyclic derivatives such as isoindolinyl, indolinyl, chromanyl, isochromanyl, phthalidyl, pyrrolidinonyl, imidazolidinonyl, chromenyl, tetrahydroquinolinyl, tetrahydroisoquinolinyl, xanthenyl, benzoxazolinyl, isatinyl, or dihydropyridyl.
• the heterocycle is heteroaryl or heterocycloalkyl, and more preferably piperidinyl, pyrrolidinyl, azepanyl, pyrrolyl, imidazolyl or thiophenyl.
• nitrogen-containing heterocycle or “nitrogen-containing heterocyclic group” refers to a heterocycle as defined above, containing at least one nitrogen atom.
• nitrogen- containing heterocycle include, but are not limited to, piperidinyl, pyrrolidinyl, azepanyl, pyrrolyl, or imidazolyl, preferably piperidinyl.
• arylalkyl or “aralkyl” as used herein corresponds to an alkyl as defined above, substituted by at least one aryl group as defined above. More specifically, “aryl(Ci-C6)alkyl” refers to a (Ci-Ce)alkyl as defined above, substituted by at least one aryl group as defined above. Examples of arylalkyl may be benzyl or phenylethyl (also named, phenethyl).
• alkylcycloalkyl corresponds to a cycloalkyl as defined above, substituted by at least one alkyl group as defined above. More specifically, “(Ci- C6)alkylcycloalkyl” refers to a cycloalkyl as defined above, substituted by at least one (Ci- C6)alkyl group as defined above.
• alkylheterocycloalkyl corresponds to a heterocycloalkyl as defined above, substituted by at least one alkyl group as defined above. More specifically, “(Ci- C6)alkylheterocycloalkyl” refers to a heterocycloalkyl as defined above, substituted by at least one (Ci-Ce)alkyl group as defined above.
• alkylaryl as used herein corresponds to an aryl as defined above, substituted by at least one alkyl group as defined above. More specifically, “(Ci-C6)alkylaryl” refers to an aryl as defined above, substituted by at least one (Ci-Ce)alkyl group as defined above.
• alkylheteroaryl corresponds to a heteroaryl as defined above, substituted by at least one alkyl group as defined above. More specifically, “(Ci- C6)alkylheteroaryl” refers to a heteroaryl as defined above, substituted by at least one (Ci- C6)alkyl group as defined above.
• halogen corresponds to a fluorine, chlorine, bromine, or iodine atom, preferably a fluorine, chlorine or bromine, and more preferably a chlorine or a fluorine.
• substituted by at least means that the radical is substituted by one or several groups of the list.
• alkyl, alkenyl, cycloalkyl, heterocycloalkyl, aryl, and heteroaryl groups as defined above may be unsubstituted or substituted by at least one substituent, said at least one substituent being selected from the group consisting of halogen, preferably fluorine and chlorine, CN, NO2, SO3H, alkyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, -C(0)R, - C(0) 2 R, -OH, -OR, -CHOHR, -C(0)NRR ⁇ -CONHOR, -CONHSO2R, -NRR’, -N(R)C(0)R ⁇ -N(R)NR’R”, -N(R)C(0) 2 R ⁇ -N(R)C(0)NR’R”, -N(R)S(0) 2 R ⁇ -SR, -S(0)R, -S(0 2 )R, - S(0)NRR’,
• treatment refers to any act intended to ameliorate the health status of patients such as therapy, prevention, prophylaxis and retardation of a disease.
• such terms refer to the amelioration or eradication of the disease, or symptoms associated with it.
• this term refers to minimizing the spread or worsening of the disease, resulting from the administration of one or more therapeutic agents to a subject with such a disease.
• the terms “subject”, “individual” or “patient” are interchangeable and refer to an animal, preferably to a mammal, even more preferably to a human, including adult, child, newborn and human at the prenatal stage.
• the term “subject” can also refer to non human animals, in particular mammals such as dogs, cats, horses, cows, pigs, sheep and non human primates, among others.
• Quantity is used interchangeably herein and may refer to an absolute quantification of a molecule.
• active principle As used herein, the terms "active principle”, “active ingredient” and “active pharmaceutical ingredient” are equivalent and refer to a component of a pharmaceutical composition having a therapeutic effect.
• the term “therapeutic effect” refers to an effect induced by an active ingredient, or a pharmaceutical composition according to the invention, capable to prevent or to delay the appearance of a disease, such as a neurodegenerative or cognitive disease, or to cure or attenuate the effects of a disease.
• the term “effective amount” refers to a quantity of an active ingredient or of a pharmaceutical composition which prevents, removes or reduces the deleterious effects of the disease. It is obvious that the quantity to be administered can be adapted by the man skilled in the art according to the subject to be treated, to the nature of the disease, etc. In particular, doses and regimen of administration may be function of the nature, of the stage and of the severity of the disease to be treated, as well as of the weight, the age and the global health of the subject to be treated, as well as of the judgment of the doctor.
• excipient or pharmaceutically acceptable carrier refers to any ingredient except active ingredients that is present in a pharmaceutical composition. Its addition may be aimed to confer a particular consistency or other physical or gustative properties to the final product. An excipient or pharmaceutically acceptable carrier must be devoid of any interaction, in particular chemical, with the active ingredients.
• heterocyclic group preferably a nitrogen-containing heterocyclic group
• SR being alkyl, aryl or aralkyl group; wherein one of Ri and R2 is H, and the other one of Ri and R2 is different from H;
• X and Y are either, respectively:
• R 4 represents H or a (Ci-C 4 )alkyl; n is 0, 1, or 2; m is 0 or 1; m’ is 0 or 1;
• R3 represents:
• R, R’, and R being independently H, (Ci-Ce)alkyl, cycloalkyl, aryl, heterocycloalkyl, heteroaryl, (Ci-C 6 )alkylcycloalkyl, (Ci-Ce)alkylaryl, (Ci- C 6 )alkylheterocycloalkyl), or (Ci-C 6 )alkylheteroaryl;
• R5 represents H or OH; and each of R6 represents independently H or a (Ci-Ce)alkyl group; an isomer, a solvate or any pharmaceutical salt thereof.
• the compounds of the invention are of formula (I) where Ri and R2 represent independently:
• SR being alkyl, aryl or aralkyl group; wherein one of Ri and R2 is H, and the other one of Ri and R2 is different from H; said group is optionally substituted by at least one -OH, halogen, (Ci-Ce)alkyl, or (Ci-
• the compounds of the invention are of formula (I) where Ri represents:
• R being alkyl, aryl or aralkyl; and R2 is H.
• the compounds of the invention are of formula (I) where Ri and R2 represent independently:
• an aryl(Ci-C6)alkyl group such as a benzyl or a phenethyl
• a heterocyclic group preferably nitrogen-containing heterocyclic group, such as a piperidinyl, pyrrolidinyl, azepanyl, pyrrolyl, or imidazolyl; wherein one of Ri and R2 is H, and the other one of Ri and R2 is different from H, said group being optionally substituted by at least one -OH, halogen, (Ci-Ce)alkyl, or (Ci-
• the compounds of the invention are of formula (I) where Ri represents:
• an aryl(Ci-C6)alkyl group such as a benzyl or a phenethyl, preferably a phenethyl;
• a heterocyclic group preferably nitrogen-containing heterocyclic group, such as a piperidinyl, pyrrolidinyl, azepanyl, pyrrolyl, or imidazolyl
• R-2 represents H.
• the compounds of the invention are of formula (I) where Ri represents:
• an aryl(Ci-C6)alkyl group such as a benzyl or a phenethyl, preferably a phenethyl; or
• Ri or R2 represents a nitrogen-containing heterocycle
• said group is preferably attached to the rest of the molecule by a nitrogen atom of said nitrogen-containing heterocycle.
• Ri is an aryl, such as a phenyl.
• R2 is H.
• R2 is H and Ri is a phenyl, optionally substituted by one or more groups selected from the group consisting of halogen, preferably fluorine or chlorine, alkyl, including alkyl group substituted by one or more halogen atoms (such as CF3), cycloalkyl, -OH, or a (Ci-Ce)alkoxy, such as methoxy, as defined above.
• halogen preferably fluorine or chlorine
• alkyl including alkyl group substituted by one or more halogen atoms (such as CF3), cycloalkyl, -OH, or a (Ci-Ce)alkoxy, such as methoxy, as defined above.
• Ri represents H; and R2 represents:
• an aryl(Ci-C6)alkyl group such as a benzyl or a phenethyl
• a heterocyclic group preferably nitrogen-containing heterocyclic group, such as a piperidinyl; preferably, R2 is an aryl, such as a phenyl.
• Ri or R2 represents an aryl, such as a phenyl
• said aryl may be unsubstituted or substituted by at least one substituent selected from:
• halogen preferably a fluorine or a chlorine
• R being an alkyl, cycloalkyl, heterocycloalkyl, aryl or heteroaryl, preferably an alkyl, more preferably a methyl or CF3.
• R3 represents:
• a cycloalkyl group such as a cyclopropyl, a cyclopentyl, a cyclohexyl or a cyclohexenyl;
• a heterocycloalkyl group such as a tetrahydropyranyl
• a heteroaryl group such as a pyridyl or a imidazolyl; said group being optionally substituted by at least one (Ci-Ce)alkyl, OH, halogen (e.g. fluorine, chlorine), aryl (e.g.
• R and R’ being independently H, (Ci-Ce)alkyl, cycloalkyl, aryl (such as a phenyl optionally substituted by a halogen (preferably a fluorine)), heterocycloalkyl, heteroaryl, (Ci-C 6 )alkylcycloalkyl, (Ci-Ce)alkylaryl, (Ci- C 6 )alkylheterocycloalkyl), or (Ci-C 6 )alkylheteroaryl; and preferably said group being optionally substituted by at least one OH, halogen (e.g. chlorine), alkoxy (e.g. methoxy), - N(R)C(0)R’ with R and R’ being H or (Ci-Ce)alkyl
• R • a radical selected from -CHOHR, -C(0)R, -C(0)2R ; R being H, (C 1 -Cefalkyl, cycloalkyl, aryl, heterocycloalkyl, heteroaryl, (Ci-C 6 )alkylcycloalkyl, (Ci-Ce)alkylaryl, (Ci- C 6 )alkylheterocycloalkyl), or (Ci-C 6 )alkylheteroaryl, R being preferably aryl (e.g. phenyl) optionally substituted by a halogen (e.g. fluorine).
• a radical selected from -CHOHR, -C(0)R, -C(0)2R R being H, (C 1 -Cefalkyl, cycloalkyl, aryl, heterocycloalkyl, heteroaryl, (Ci-C 6 )alkylcycloalkyl, (Ci-Ce)al
• R3 is selected from the group consisting of:
• heterocycloalkyl such as a tetrahydropyranyl
• R3 is selected from the group consisting of:
• a pyridyl • a imidazolyl, • a phenyl, said phenyl being optionally substituted by a halogen such as a chlorine or fluorine, or by OH,
• R being an aryl, preferably a phenyl optionally substituted by a fluorine
• radical -C(0)R R being an aryl, preferably a phenyl optionally substituted by a fluorine
• R’ being a (Ci-Ce)alkyl, preferably a methyl
• R3 is a phenyl
• X and Y are either, respectively:
• R4 being H or (Ci-C4)alkyl, preferably H.
• X and Y are N and CR4, respectively, wherein R4 is H or a (Ci- C4)alkyl, preferably R4 is H or methyl, more preferably R4 is H.
• Rs is H.
• each R6 is independently H or methyl.
• R6 when n is 0, then R6 is not present; -when n is 1, then one R.6 is present and the compound of formula (I) is represented by the following structure: wherein Ri, R2, R3, Rs, X, Y, m, and m’ are as defined above, and R6 is H or a (Ci-Ce)alkyl group;
• R6 is H (each R6 when n is 2).
• Rs and (each) R6 are H.
• m is 0.
• m’ is 1.
• n is 0 and m’ is 1.
• n is 0 or 1, and more preferably n is 1.
• the compound of the invention is a compound of formula (I) wherein at least one of, and preferably all, the following features is (are) fulfilled: n is 1; and/or m is 0; and/or m’ is 1; and/or
• Ri represents an aryl group; and/or R2 is H; and/or R3 represents:
• aryl(Ci-C 6 )alkyl e.g. benzyl
• said radical being optionally substituted by one or two (Ci-Ce)alkyl, OH, halogen (e.g. fluorine, chlorine), aryl (e.g.
• phenyl phenyl
• heteroaryl cycloalkyl, heterocycloalkyl, (Ci- C 6 )alkoxy, -C(0)2R, -N(R)C(0)R’;
• R and R’ being independently H, (Ci-Ce)alkyl, cycloalkyl, aryl (such as a phenyl optionally substituted by a halogen (preferably a fluorine)), heterocycloalkyl, heteroaryl, (Ci-C 6 )alkylcycloalkyl, (Ci-Ce)alkylaryl, (Ci- C 6 )alkylheterocycloalkyl), or (Ci-Ce)alkylheteroaryl; or
• R5 is H; and/or each R6 is H.
• Ri is selected from the group consisting of:
• aryl(Ci-C 6 )alkyl group such as phenethyl
• an aryl group such a phenyl, optionally substituted by a halogen (e.g. a chlorine)
• a halogen e.g. a chlorine
• a heterocyclic group preferably a nitrogen-containing heterocyclic group, such as a piperidinyl
• R3 is selected from the group consisting of:
• heterocycloalkyl such as a tetrahydropyranyl
• R5 is H or OH, preferably H.
• R6 is H or a (Ci-Ce)alkyl, such a methyl, preferably H;
• X and Y are either, respectively:
• R4 being H or (Ci-C4)alkyl, preferably H,
• N and CH • preferably, N and CH; n is 0 or 1, preferably 1; and m is 0 and m’ is 1.
• the aryl group is a phenyl group optionally substituted by at least one substituent, said at least one substituent being selected from:
• halogen preferably a fluorine or a chlorine
• R being an alkyl, cycloalkyl, heterocycloalkyl, aryl or heteroaryl, preferably an alkyl, more preferably a methyl.
• Ri and R2 represent independently:
• Ri and R2 • a piperidinyl group; wherein one of Ri and R2 is H, and the other one of Ri and R2 is different from H;
• X and Y are either CH and N, or N and CH, or CH and CH, respectively;
• n is 0, 1, or 2;
• m is 0 or 1;
• m’ is 0 or 1;
• R3 represents:
• a phenyl said phenyl being optionally substituted by a halogen such as a chlorine, or by OH,
• R being an aryl, preferably a phenyl optionally substituted by a fluorine
• radical -C(0)R R being an aryl, preferably a phenyl optionally substituted by a fluorine
• R being a (Ci-Ce)alkyl, preferably a methyl
• a compound of the invention means a compound described above or a pharmaceutically acceptable salt, any isomer or solvate form thereof.
• the term “isomer” refers to compounds which have identical molecular formulae as identified herein but which differ by nature or in the binding sequence of their atoms or in the layout of their atoms in space. Isomers which differ in the layout of their atoms in space are designated by “stereoisomers”. Stereosiomers which are not mirror images of each other, are designated as “diastereoisomers”, and stereoisomers which are non-superposable mirror images of each other are designated as “enantiomers” or “optical isomers”. “Stereoisomers” refer to racemates, enantiomers and diastereoisomers.
• stereocenters exist in the compounds of the invention. Any chiral center of a compound of the invention can be (R), (S) or racemate. Accordingly, the present invention includes all possible stereoisomers and geometric isomers of the compounds of formula (I) and includes not only racemic compounds but also the optically active isomers as well. According to a preferred embodiment, compounds of the invention are of formula (II).
• a compound of formula (I) When a compound of formula (I) is desired as a single enantiomer, it may be obtained either by resolution of the final product or by stereospecific synthesis from either isomerically pure starting material or any suitable intermediate. Resolution of the final product, an intermediate or a starting material may be carried out by any suitable method known in the art. See, for example, Stereochemistry of Carbon Compounds by E. L. Eliel (Mcgraw Hill, 1962) and Tables of Resolving Agents by S. H. Wilen.
• pharmaceutically acceptable salts or “pharmaceutical salts” of the compounds of the invention include conventional salts formed from pharmaceutically acceptable inorganic or organic acids or bases as well as quaternary ammonium salts. More specific examples of suitable acid salts include hydrochloric, hydrobromic, sulfuric, phosphoric, nitric, perchloric, fumaric, acetic, propionic, succinic, glycolic, formic, lactic, maleic, tartaric, citric, palmoic, malonic, hydroxymaleic, phenylacetic, glutamic, benzoic, salicylic, fumaric, toluenesulfonic, methanesulfonic, naphthalene-2-sulfonic, benzenesulfonic hydroxynaphthoic, hydroiodic, malic, steroic, tannic etc.
• Suitable basic salts include sodium, lithium, potassium, magnesium, aluminium, calcium, zinc, N,N'-dibenzylethylenediamine, chloroprocaine, choline, diethanolamine, ethylenediamine, N-methylglucamine and procaine salts.
• preferred salt forms include hydrochloride.
• the compound of formula (I) is selected in the group consisting of: 2-(l-benzylpiperidin-4-yl)-4-phenylpyridazin-3(2H)-one hydrochloride; 2-(l-benzylpiperidin-4-yl)-5-phenylpyridazin-3(2H)-one hydrochloride; 4-phenyl-2-[l-(2-phenylethyl)piperidin-4-yl]-2,3-dihydropyridazin-3-one hydrochloride; 2-[l-(cyclopropylmethyl)piperidin-4-yl]-4-phenyl-2,3-dihydropyridazin-3-one hydrochloride; 2-[l-(cyclopentylmethyl)piperidin-4-yl]-4-phenyl-2,3-dihydropyridazin-3-one hydrochloride; 2-(l-benzylazepan-4-yl)-4-phenyl-2-phenyl-2
• said compound is selected in the group consisting of:
• the compounds of the invention can be prepared by several methods, and in particular the methods as illustrated in the examples.
• the starting products are commercial products or products prepared according to known synthesis from commercial compounds or known to one skilled in the art.
• the present invention relates to a pharmaceutical or veterinary composition
• a pharmaceutical or veterinary composition comprising a compound according to the invention.
• the pharmaceutical composition further comprises a pharmaceutically or veterinary acceptable carrier (or “support”) or excipient.
• the invention further relates to a method for treating a disease in a subj ect, wherein a therapeutically effective amount of a compound according to the invention, is administered to said subject in need thereof.
• the present invention relates to the use of a compound according to the invention as a medicine.
• the invention also relates to the use of a compound according to the invention, for the manufacture of a medicine.
• the present invention relates to a method for treating of a disorder modulated by sigma- 1 receptor (e.g. cognitive or neurodegenerative disorders), in a subject, wherein a therapeutically effective amount of a compound according to the invention, is administered to said subject suffering of a disorder modulated by sigma-1 receptor (e.g. cognitive or neurodegenerative disorders).
• the invention also relates to the use of the compounds according to the invention, for the manufacture of a medicine for the treatment of a disorder modulated by sigma- 1 receptor (e.g. cognitive or neurodegenerative disorders).
• a disorder modulated by sigma- 1 receptor e.g. cognitive or neurodegenerative disorders.
• the invention relates to a compound according to the invention for use in the treatment of a disorder modulated by sigma- 1 receptor (e.g. cognitive disorders).
• said disorder modulated by sigma- 1 receptor is selected from the group consisting of (1) neurodegenerative diseases including, but not limited to, Alzheimer disease, Parkinson's disease, Huntington's disease, Amyotrophic lateral sclerosis, multiple sclerosis; (2) cognitive and memory alterations including, but not limited to, pathological ageing, ischemic amnesia, schizophrenia-related cognitive deficits, depression; (3) developmental cognitive disorders including, but not limited to, autism-related disorders, mental retardation-related disorders; and (4) genetic diseases associated with MAM dysfunctions.
• neurodegenerative diseases including, but not limited to, Alzheimer disease, Parkinson's disease, Huntington's disease, Amyotrophic lateral sclerosis, multiple sclerosis
• cognitive and memory alterations including, but not limited to, pathological ageing, ischemic amnesia, schizophrenia-related cognitive deficits, depression
• developmental cognitive disorders including, but not limited to, autism-related disorders, mental retardation-related disorders
• genetic diseases associated with MAM dysfunctions are selected from the group consisting of (1) neurodegenerative diseases including,
• the present invention also relates to a pharmaceutical composition
• a pharmaceutical composition comprising a compound of the present invention.
• the composition further comprises at least one pharmaceutically acceptable carrier (or “support”) or excipient.
• the invention also concerns the pharmaceutical composition of the invention for use in the treatment of a disease.
• the invention also relates to the use of a pharmaceutical composition according to the invention for the manufacture of a medicine for treating a disease in a subject.
• the invention further relates to a method for treating a disease in a subject, wherein a therapeutically effective amount of a pharmaceutical composition according to the invention is administered to said subject suffering from said disease.
• the disease is a disorder modulated by sigma- 1 receptor. More preferably, the disease is selected from the group consisting of (1) neurodegenerative diseases including, but not limited to, Alzheimer disease, Parkinson's disease, Huntington's disease, Amyotrophic lateral sclerosis, multiple sclerosis; (2) cognitive and memory alterations including, but not limited to, pathological ageing, ischemic amnesia, schizophrenia-related cognitive deficits, depression; (3) developmental cognitive disorders including, but not limited to, autism-related disorders, mental retardation-related disorders; and (4) genetic diseases associated with MAM dysfunctions.
• neurodegenerative diseases including, but not limited to, Alzheimer disease, Parkinson's disease, Huntington's disease, Amyotrophic lateral sclerosis, multiple sclerosis
• cognitive and memory alterations including, but not limited to, pathological ageing, ischemic amnesia, schizophrenia-related cognitive deficits, depression
• developmental cognitive disorders including, but not limited to, autism-related disorders, mental retardation-related disorders
• genetic diseases associated with MAM dysfunctions are examples of M
• the subject according to the invention is an animal, preferably a mammal, even more preferably a human.
• the term "subject” can also refer to non-human animals, in particular mammals such as dogs, cats, horses, cows, pigs, sheep, donkeys, rabbits, ferrets, gerbils, hamsters, chinchillas, rats, mice, guinea pigs and non-human primates, among others, that are in need of treatment.
• the human subject according to the invention may be a human at the prenatal stage, a new born, a child, an infant, an adolescent or an adult, in particular an adult of at least 40 years old, preferably an adult of at least 50 years old.
• the subject has been diagnosed with a disease.
• the subject has been diagnosed with a disease modulated by sigma- 1 receptor.
• the compound according to the invention or the pharmaceutical composition according to the invention may be administered by any conventional route of administration.
• the compound or the pharmaceutical composition of the invention can be administered by a topical, enteral, oral, parenteral, intranasal, intravenous, intra-arterial, intramuscular, intratumoral, subcutaneous or intraocular administration and the like.
• the compound according to the invention or the pharmaceutical composition according to the invention can be formulated for a topical, enteral, oral, parenteral, intranasal, intravenous, intra-arterial, intramuscular, subcutaneous or intraocular administration and the like.
• the compound according to the invention or the pharmaceutical composition according to the invention is administered by enteral or parenteral route of administration.
• the compound according to the invention or the pharmaceutical composition according to the invention is preferably administered by intravenous route of administration.
• the compound according to the invention or the pharmaceutical composition according to the invention is preferably administered by oral route of administration.
• composition comprising the molecule is formulated in accordance with standard pharmaceutical practice (Lippincott Williams & Wilkins, 2000 and Encyclopedia of Pharmaceutical Technology, eds. J. Swarbrick and J. C. Boylan, 1988-1999, Marcel Dekker, New York) known by a person skilled in the art.
• the composition can be formulated into conventional oral dosage forms such as tablets, capsules, powders, granules and liquid preparations such as syrups, elixirs, and concentrated drops.
• Nontoxic solid carriers or diluents may be used which include, for example, pharmaceutical grades of mannitol, lactose, starch, magnesium stearate, sodium saccharine, talcum, cellulose, glucose, sucrose, magnesium, carbonate, and the like.
• binders which are agents which impart cohesive qualities to powdered materials, are also necessary.
• starch, gelatin, sugars such as lactose or dextrose, and natural or synthetic gums can be used as binders.
• Disintegrants are also necessary in the tablets to facilitate break-up of the tablet.
• Disintegrants include starches, clays, celluloses, algins, gums and crosslinked polymers.
• lubricants and glidants are also included in the tablets to prevent adhesion to the tablet material to surfaces in the manufacturing process and to improve the flow characteristics of the powder material during manufacture.
• Colloidal silicon dioxide is most commonly used as a glidant and compounds such as talc or stearic acids are most commonly used as lubricants.
• composition can be formulated into ointment, cream or gel form and appropriate penetrants or detergents could be used to facilitate permeation, such as dimethyl sulfoxide, dimethyl acetamide and dimethylformamide.
• nasal sprays for transmucosal administration, nasal sprays, rectal or vaginal suppositories can be used.
• the active compound can be incorporated into any of the known suppository bases by methods known in the art. Examples of such bases include cocoa butter, polyethylene glycols (carbowaxes), polyethylene sorbitan monostearate, and mixtures of these with other compatible materials to modify the melting point or dissolution rate.
• compositions according to the invention may be formulated to release the active drug substantially immediately upon administration or at any predetermined time or time period after administration.
• the treatment with the compound according to the invention or the pharmaceutical composition according to the invention starts no longer than one year, preferably no longer than six, five, four, three, two or one month(s), after the diagnosis of the disease.
• the compound according to the invention or the pharmaceutical composition according to the invention may be administered as a single dose or preferably in multiple doses.
• the treatment is administered regularly, preferably between every day and every month, more preferably between every day and every two weeks, more preferably between every day and every week, even more preferably the treatment is administered every day.
• the treatment is administered several times a day, such as 2 or 3 times a day.
• the duration of treatment with the compound according to the invention or the pharmaceutical composition according to the invention is preferably comprised between one week, more preferably between one week and one or more year(s). Alternatively, the treatment may last as long as the disease persists.
• the amount of compound according to the invention or of pharmaceutical composition according to the invention to be administered has to be determined by standard procedure well known by those of ordinary skills in the art. Physiological data of the patient (e.g. age, size, and weight) and the routes of administration have to be taken into account to determine the appropriate dosage, so as a therapeutically effective amount will be administered to the patient.
• the total compound dose for each administration of the compound according to the invention or of the pharmaceutical composition according to the invention is comprised between 0.00001 and 1 g, preferably between 0.01 and 10 mg.
• compositions can be adjusted by the man skilled in the art according to the type and severity of the disease, and to the patient, in particular its age, weight, sex, and general physical condition.
• Scheme 1 General synthetic method for the preparation of 2 substituted - N-substituted- piperidin-4-yl -4 or (5) -phenyl pyridazin-3(2H)-one.
• Example A.l 2-(T-benzylpiperidin-4-vO-4-phenylpyridazin-3 -one hydrochlorideicpd 1).
• Step 4 2-(l-benzylpiperidin-4-yl)-4-phenylpyridazin-3(2H)-one (cpd 1). 4-phenyl-2-(piperidin-4-yl)pyridazin-3(2H)-one trifluoroacetate (94 mg, 0.368 mmol) was dissolved in MeOH (5 mL). Benzaldehyde (58.6 mg, 56 pL, 1.5 equiv.) was added followed by NaB3 ⁇ 4CN (46.3 mg, 0.74 mmol, 2 equiv.). The resulting mixture was stirred at 25°C for 48h. Volatiles were evaporated and the crude was taken up in EtOAc (25 mL).
• Step 2 4-phenyl-2, -one (intermediate B)
• the vial was properly capped and the mixture vessel was evacuated and backfilled with argon (process repeated 3 times) and heated at 120°C until complete conversion of the starting material.
• the reaction conversion was monitored by HPLC and was usually completed within 16 hours. After cooling to room temperature, the reaction mixture was evaporated to dryness.
• the crude was partitioned through EtOAc (30 mL) and H2O (50 mL). The aqueous phase was extracted twice with EtOAc (20 mL). The organic phases were combined, washed with brine and dried over Na2S04 and evaporated.
• the crude material was flash chromatography using a gradient of 50 to 70% of EtOAc in heptane to give the title compound as an yellow solid (2.34 g, 13.6 mmol, 89%).
• Step 4 2-((l-phenethylpiperidin-4-yl)methyl)-4-phenylpyridazin-3(2H)-one (cpd 10)
• Example A.3 2-((l-(2-methoxyethvDpiperidin-4-vDmethvD-4-phenylpyridazin-3 -one
• Example A.4 2-(Yl-(2-(4-fluorophenv0-2-hvdroxyethv0piperidin-4-v0methv0-4- phenylpyridazin-3(2H)-one hydrochloride, (cpd 23).
• Step 1 2-((l-(2-(4-fluorophenyl)-2-oxoethyl)piperidin-4-yl)methyl)-4-phenylpyridazin- 3(2H)-one hydrochloride (cpd 24).
• Step 2 2-((l-(2-(4-fluorophenyl)-2-hydroxyethyl)piperidin-4-yl)methyl)-4-phenylpyridazin- 3(2H)-one hydrochloride ⁇ (cpd 23).
• Example A.5 2-12-0 -benzylpiperidin-4-v0ethv0-4-phenylpyridazin-3(2H)-one hydrochloride, (cpd 26).
• Step 1 tert-butyl 4-(2-((chlorosulfonyl)oxy)ethyl)piperidine-l-carboxylate
• mesylchloride 0.52 mL, 2 equiv.
• mesylchloride 0.52 mL, 2 equiv.
• a solution of tert-butyl 4-(2-hydroxyethyl)piperidine-l-carboxylate 840 mg, 3.7 mmol, 1.0 equiv.
• triethylamine 1.0 mL, 2 equiv.
• the solution was stirred for 4 h and was quenched with 20 mL of 1 M HC1.
• the aqueous phase was extracted with EtOAc (3x20 mL), the combined organic layers were washed with brine (20 mL), dried over NaiSCri, filtered and then concentrated under vacuum.
• Step 3 2-(2-(l-benzylpiperidin-4-yl)ethyl)-4-phenylpyridazin-3(2H)-one, (cpd 26).
• the invention provides also a process for the preparation of compounds of general formula (I) carrying small substituents R’ (fluoro, methyl or hydroxyl) or R (Cl-C5-alkyl, C3- C7 cycloalkyl) on C-4 carbon of the piperidine.
• R’ fluoro, methyl or hydroxyl
• R Cl-C5-alkyl, C3- C7 cycloalkyl
• Example A.6 2-(l-n-benzylpiperidin-4-vnethvn-4-phenylpyridazin-3 -one hydro chloride (cpd 28).
• the Suzuki-Miyaura cross coupling reaction can be performed later in the sequence enabling more convergent methods for i) the introduction of various aryls on positions 4 or 5 of the pyridazinones rings (method a) or ii) the functionalization of the piperidine moieties (method b)
• Method a) the introduction of various aryls on positions 4 or 5 of the pyridazinones rings
• method b the functionalization of the piperidine moieties
• N-alkylation of chloropyridazinone derivatives A with appropriate tert-butyl 4- methyl sulfonyl oxy-piperidine- 1-carboxylate derivatives of general formula C afforded intermediates E.
• Example A.7 2-(T-benzylpiperidin-4-v0-4-(4-methoxyphenv0pyridazin-3 -one hydrochloride , (cpd 30).
• Step 1 tert-butyl 4-((5-chloro-6-oxopyridazin- 1 (6H)-yl))piperidine- 1 -carboxylate
• tert-butyl 4-(5-(4-methoxyphenyl)-6-oxopyridazin-l(6H)-yl)piperidine-l-carboxylate A microwave vial (oven-dried and under argon) was charged with 4- methoxyphenylboronic acid (125.9 mg, 0.83 mmol, 1.3 equiv.), tert-butyl 4-(5-chloro-6- oxopyridazin-l(6H)-yl)piperidine-l-carboxylate (200 mg, 0.64 mmol, 1.0 equiv.), sodium carbonate (135.1 mg, 1.27 mmol, 2 equiv.).
• Tetrakis(triphenylphosphine) palladium(O) (74.4 mg, 10 mol %.) was then added, followed by DME (3.34 mL), and HzO (1.1 mL).
• the vial was properly capped and the mixture vessel was evacuated and backfilled with argon (process repeated 3 times), and heated at 100°C until complete conversion of the starting material.
• the reaction conversion was monitored by HPLC and was usually completed within 16 hours. After cooling to room temperature, the reaction mixture was evaporated to dryness.
• the crude was partitioned through EtOAc (30 mL) and EbO (50mL). The aqueous phase was extracted twice with EtOAc (20 mL).
• Step 3 2-(l-benzylpiperidin-4-yl)-4-(4-methoxyphenyl)-2, 3-dihydro pyridazin-3-one hydrochloride, (cpd 30).
• Benzaldehyde (74.3 mg, 70.8 pL, 1.5 equiv.) was added followed NaB3 ⁇ 4CN (61. 8 mg, 0.9 mmol, 2 equiv.) and AcOH (2.7 m ⁇ ). The resulting mixture was stirred at rt for 16h. Volatiles were evaporated and the crude was taken up in EtOAc (25 mL). The organic phase was washed with brine, dried and concentrated under vacuum.
• tert-butyl 4-((5- chloro-6-oxopyridazin-l(6H)-yl))piperidine-l-carboxylate 100 mg, 0.32 mmol, 1 equiv.
• 4-trifluoromethyl phenylboronic acid 78.7 mg, 0.41 mmol, 1.3 equiv.
• tert-butyl 4- ⁇ 6-oxo-5- [4-(trifluoromethyl)phenyl]- 1 ,6-dihydropyridazin- 1 -yl (piperidine- 1 -carboxylate was obtained as a white solid (65 mg, 48%).
• tert-butyl 4-((5- chloro-6-oxopyridazin-l(6H)-yl))piperidine-l -carboxylate 200 mg, 0.64 mmol, 1 equiv.
• 4-chlorophenylboronic acid 99.7 mg, 0.63 mmol, 1.0 equiv.
• tert-butyl 4- ⁇ 6-oxo-5-[4- chlorophenyl]-l,6-dihydropyridazin-l-yl (piperi dine- 1 -carboxylate was obtained as a yellow solid (195 mg, 78%).
• Example A.8 2-[(l-benzylpiperidin-4-yl)methyl]-4-(2-chlorophenyl)-2,3-dihydropyridazin- 3 -one hydrochloride, (cpd 33).
• Step 1 tert-butyl 4-((5-chloro-6-oxopyridazin-l(6H)-yl)methyl)piperidine-l-carboxylate
• Tetrakis(triphenylphosphine) palladium(O) (26.4 mg, 5 mol %.) was then added, followed by toluene (1.74 mL), and H2O (0.35 mL) and EtOH (0.35 mL) .
• the vial was properly capped and the mixture vessel was evacuated and backfilled with argon (process repeated 3 times) and heated at 120°C until complete conversion of the starting material.
• the reaction conversion was monitored by HPLC and was usually completed within 17 hours. After cooling to room temperature, the reaction mixture was evaporated to dryness.
• the crude was partitioned through EtOAc (30 mL) and H2O (50mL). The aqueous phase was extracted twice with EtOAc (20 mL).
• Step 3 2-[(l-benzylpiperidin-4-yl)methyl]-4-(2-chlorophenyl)-2,3-dihydropyridazin-3-one hydrochloride, (cpd 33).
• Benzaldehyde (36.5 mg, 34.7 pL, 1.2 equiv.) was added followed by NaBHsCN (35. 9 mg, 0.57 mmol, 2 equiv.). The resulting mixture was stirred at rt for 19h. Volatiles were evaporated and the crude was taken up in EtOAc (25 mL). The organic phase was washed with brine, dried and concentrated under vacuum.
• Example A.9 2-(Yl-benzylpiperidin-4-v0methv0-4-(4-fluorophenv0pyridazin-3 -one hydrochloride (cpd 35).
• Step 1 tert-butyl 4-((5-chloro-6-oxopyridazin-l(6H)-yl)methyl)piperidine-l-carboxylate
• the reaction was performed in anhydrous conditions under argon atmosphere.
• 4-chloro-2, 3-dihydropyridazin-3-one 110 mg, 0.84 mmol, 1.0 equiv.
• dry DMF 8.42 mL
• sodium hydride 67.41 mg, 1.68 mmol, 2.0 equiv.
• tert-butyl 4- [(methylsulfonyl)oxy)methyl]piperidine-l-carboxylate (296.7 mg, 1.01 mmol, 1.2 equiv.) was added portionwise and the mixture was heated at 110°C overnight (HPLC monitoring: complete conversion). The mixture was quenched with H2O (150 mL) and extracted with EtOAc (3 x 40 mL). The combined organic layers were washed with brine (2 x 50 mL), dried over NaiSCri, filtered and evaporated to dryness.
• Benzaldehyde (388 mg, 370 pL, 1.2 equiv.) was added, followed by NaBHsCN (61.8 mg, 0.9 mmol, 2 equiv.) and DIEA (2.0 mL, 4 equiv.). The resulting mixture was stirred at rt for 16h. Volatiles were evaporated and the crude was taken up in EtOAc (25 mL). The organic phase was washed with brine, dried and concentrated under vacuum.
• the vial was properly capped and the mixture vessel was evacuated and backfilled with argon (process repeated 3 times) and heated at 120°C until complete conversion of the starting material.
• the reaction conversion was monitored by HPLC and was usually completed within 16 hours. After cooling to room temperature, the reaction mixture was evaporated to dryness.
• the crude was partitioned through EtOAc (30 mL) and EbO (50mL). The aqueous phase was extracted twice with EtOAc (20 mL). The organic phases were combined, washed with brine and dried (Na2S04) and evaporated.
• a Sonogashira cross coupling reaction could be performed starting from the title intermediate of general structure E (see scheme 4).
• the resulting alkynes derivatives of general structure F (where R7 is an aryl group, such as phenyl) were hydrogenated using Pd/C as catalyst.
• Deprotection of the tert-butyloxy carbonyl group followed by alkylation, or reductive amination of the resulting piperidine derivatives gave examples of the present invention.
• a Suzuki-Miyaura cross-coupling reaction with the help of alkyl boronic acids could be an alternative way to introduce alkyl or aralkyl groups in positions 4 or 5 of the pyridazinones moieties.
• General conditions used are depicted in scheme 4.
• X Cl, Br, I
• Example A.10 2-(Yl-benzylpiperidin-4-v0methv0-4-phenethylpyridazin-3 -one (cpd 36).
• Step 1 tert-butyl 4-((6-oxo-5-(phenylethynyl)pyridazin-l(6H)-yl)methyl)piperidine-l- carboxylate
• Step 2 tert-butyl 4-((6-oxo-5-phenethylpyridazin-l(6H)-yl)methyl)piperidine-l- carboxylate
• Step 3 2-((l-benzylpiperidin-4-yl)methyl)-4-phenethylpyridazin-3(2H)-one hydrochloride, (cpd 36).
• Benzaldehyde (26.6 mg, 25 pL, 1.2 equiv.) was added followed by NaBHsCN (26.2 mg, 0.42 mmol, 2 equiv.) and DIEA (145 pL, 4 equiv). The resulting mixture was stirred at rt for 16h. Volatiles were evaporated and the crude was taken up in EtOAc (25 mL). The organic phase was washed with brine, dried and concentrated under vacuum.
• Example A.11 2-(l-benzylpiperidin-4-yl)-4-(2-phenylethyl)-2,3-dihydropyridazin-3-one hydrochloride, (cpd 37).
• Step 1 tert-butyl 4-[6-oxo-5-(2-phenylethyl)- 1 ,6-dihydropyridazin- 1 -yljpiperidine- 1 - carboxyl ate
• the vial was properly capped, and the mixture vessel was evacuated and backfilled with argon (process repeated 3 times) and heated at 100°C until complete conversion of the starting material.
• the reaction conversion was monitored by HPLC and was usually completed within 16 hours. After cooling to room temperature, the reaction mixture was evaporated to dryness.
• the crude was partitioned through EtOAc (30 mL) and H2O (50 mL). The aqueous phase was extracted twice with EtOAc (20 mL). The organic phases were combined, washed with brine and dried (Na2S04) and evaporated.
• the crude material was flash chromatography using a gradient of 0 % to 100% EtOAc in heptane to give the title compound as a colorless oil (66 mg, 27%).
• Step 2 2-(l-benzylpiperidin-4-yl)-4-(2-phenylethyl)-2,3-dihydropyridazin-3-one hydrochloride, (cpd 37).
• the vial was properly capped and the mixture vessel was evacuated and backfilled with argon (process repeated 3 times) and heated at 100°C until complete conversion of the starting material.
• the reaction conversion was monitored by HPLC and was usually completed within 16 hours. After cooling to room temperature, the reaction mixture was evaporated to dryness.
• the crude was partitioned through EtOAc (30 mL) and H2O (50 mL).
• Example A.13 2-(Yl-benzylpiperidin-4-v0methv0-4-morpholinopyridazin-3(2HVone hydrochloride (cpd 40).
• Step 1 tert-butyl 4-((5-morpholino-6-oxopyridazin-l(6H)-yl)methyl)piperidine-l-carboxylate
• the vial was properly capped and the mixture vessel was evacuated and backfilled with argon (process repeated 3 times) and heated at 120°C until complete conversion of the starting material.
• the reaction conversion was monitored by HPLC and was usually completed within 16 hours. After cooling to room temperature, the reaction mixture was evaporated to dryness.
• the crude was partitioned through EtOAc (30 mL) and H2O (50 mL).
• Step 2 2-((l-benzylpiperidin-4-yl)methyl)-4-morpholinopyridazin-3(2H)-one hydrochloride, (cpd 40).
• Benzaldehyde (36.3 mg, 34.5 pL, 1.5 equiv.) was added followed NaBHsCN (28.6 mg, 0.46 mmol, 2 equiv.) and DIEA (117.8 mg, 158 m ⁇ , 4 equiv.). The resulting mixture was stirred at rt for 48h. Volatiles were evaporated and the crude was taken up in EtOAc (25 mL). The organic phase was washed with brine, dried and concentrated under vacuum.
• Step 1 tert-butyl 4-((6-oxo-5-(4-phenylpiperazin-l-yl)pyridazin-l(6H)-yl)methyl)piperidine- 1 -carboxyl ate
• Step 2 2-(l-benzylpiperidin-4-yl)-4-(4-phenylpiperazin-l-yl)pyridazin-3(2H)-one hydro chloride, (cpd 41).
• Step 1 tert-butyl 4-((5-(3,4-dihydroisoquinolin-2(lH)-yl)-6-oxopyridazin-l(6H)-yl)methyl)- piperidine- 1 -carboxylate
• the pyridazinones ring can be replaced by a pyridone or pyrimidone ring of general structure H, in a similar 4-step sequence as depicted in the following scheme 6.
• n 0, K2CO3, 2-butanone, 85°C, 24h ; b) NaH, DMF, 110°C, 18h ; c) K2CO3, Pd(PPh 3 ) 4 , Ar-PhB(OH)2, Toluene, EtOH, H2O, 120°C, 16h; d) TFA, DCM, 25°C, 45 min; e) NaBFLCN; DIE A, MeOH, 25°C, 18h orR 3 -CH 2 Br, K2CO3, DMF or MeCN, 80°C, 18h.
• Example A.14 3-(T-benzylpiperidin-4-vO-5-phenylpyrimidin-4 -one hydrochloride (cpd 43).
• Step 1 tert-butyl 4-(6-oxo-5-phenylpyrimidin-l(6H)-yl)piperidine-l-carboxylate
• the vial was properly capped and the mixture vessel was evacuated and backfilled with argon (process repeated 3 times) and heated at 100°C until complete conversion of the starting material.
• the reaction conversion was monitored by HPLC and was usually completed within 16 hours. After cooling to room temperature, the reaction mixture was evaporated to dryness.
• the crude was partitioned through EtOAc (30 mL) and EbO (50 mL). The aqueous phase was extracted twice with EtOAc (20 mL). The organic phases were combined, washed with brine and dried (Na 2 S04) and evaporated.
• Benzaldehyde (48.4mg, 46.1 pL, 1.5 equiv.) was added followed NaBHsCN (40.22 mg, 0.6 mmol, 2 equiv.) and AcOH (1.7 m ⁇ ). The resulting mixture was stirred at rt for 16h. Volatiles were evaporated and the crude was taken up in EtOAc (25 mL). The organic phase was washed with brine, dried and concentrated under vacuum.
• tert-butyl 4-[(5-bromo-6-oxo-l,6-dihydropyrimidin-l- yl)methyl]piperidine- 1-carboxylate 73 mg, 0.19 mmol, 1 equiv.
• a Suzuki Miyaura cross coupling reaction with the help of phenylboronic acid (26.3 mg, 0.21 mmol, 1.1 equiv.)
• tert- butyl 4-[(6-oxo-5-phenyl- 1 ,6-dihydropyrimidin- 1 -yl)methyl]piperidine- 1 -carboxylate was obtained after after flash chromatography on silica gel (Hept/EtOAc) as a yellow oil (32.7 mg, 45%).
• tert-butyl 4-[(3-bromo-2-oxo-l,2-dihydropyridin-l-yl)methyl]piperidine- 1-carboxylate (123 mg, 0.33 mmol, 1 equiv.)
• a Suzuki Miyaura cross coupling reaction with the help of phenylboronic acid (44.4 mg, 0.36 mmol, 1.1 equiv.)
• tert-butyl 4-[(2-oxo-3-phenyl- l,2-dihydropyridin-l-yl)methyl]piperidine-l-carboxylate was obtained after flash chromatography on silica gel (Hept/EtOAc) as a yellow oil (100 mg, 82%).
• the inhibition of [ 3 H](+)-pentazocine binding assay is mainly used to determine the inhibition constant (Ki) of potential sigma- 1 receptor ligands.
• Ki inhibition constant

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