Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/33—Heterocyclic compounds
  • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
  • A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
  • A61K31/505—Pyrimidines; Hydrogenated pyrimidines, e.g. trimethoprim
  • A61K31/519—Pyrimidines; Hydrogenated pyrimidines, e.g. trimethoprim ortho- or peri-condensed with heterocyclic rings
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/33—Heterocyclic compounds
  • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
  • A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P25/00—Drugs for disorders of the nervous system
  • A61P25/18—Antipsychotics, i.e. neuroleptics; Drugs for mania or schizophrenia
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P25/00—Drugs for disorders of the nervous system
  • A61P25/22—Anxiolytics
• • 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
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
  • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
  • Y02A50/30—Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change

Definitions

• the present invention relates to a new use for compounds that inhibit phosphodiesterase 1 (PDEl), e.g., that inhibit PDEl -mediated suppression of the dopamine Dl receptor intracellular pathway, specifically for the treatment of psychosis, e.g., in schizophrenia, schizoaffective disorder, schizophreniform disorder, psychotic disorder, delusional disorder, mania, or bipolar disorder.
• PDEl phosphodiesterase 1
• PDEs phosphodiesterases
• CaM-PDEs Ca 2+ -calmodulin-dependent phosphodiesterases
• PDElA is expressed throughout the brain with higher levels of expression in the CAl to CA3 layers of the hippocampus and cerebellum and at a low level in the striatum.
• PDElA is also expressed in the lung and heart.
• PDElB is predominately expressed in the striatum, dentate gyrus, olfactory tract and cerebellum, and its expression correlates with brain regions having high levels of dopaminergic innervation. Although PDElB is primarily expressed in the central nervous system, it may be detected in the heart. PDElC is primarily expressed in olfactory epithelium, cerebellar granule cells, and striatum. PDElC is also expressed in the heart and vascular smooth muscle.
• Cyclic nucleotide phosphodiesterases downregulate intracellular cAMP and cGMP signaling by hydrolyzing these cyclic nucleotides to their respective inactive 5 '-monophosphates (5'AMP and 5'GMP).
• CaM-PDEs play a critical role in mediating signal transduction in brain cells, particularly within an area of the brain known as the basal ganglia or striatum.
• NMDA-type glutamate receptor activation and/or dopamine D2 receptor activation result in increased intracellular calcium concentrations, leading to activation of effectors such as calmoduJin-dependent kinase II (CaMKII) and calcineurin and to activation of CaM-PDEs, resulting in reduced cAMP and cGMP.
• effectors such as calmoduJin-dependent kinase II (CaMKII) and calcineurin
• CaM-PDEs resulting in reduced cAMP and cGMP.
• Dopamine Dl receptor activation leads to activation of calcium dependent nucleotide cyclases, resulting in increased cAMP and cGMP.
• PKA protein kinase A
• PKG protein kinase G
• DARPP-32 dopamine and cAMP- regulated phosphoprotein
• CREB cAMP responsive element binding protein
• CaM-PDEs can therefore affect dopamine-regulated and other intracellular signaling pathways in the basal ganglia (striatum), including but not limited to nitric oxide, noradrenergic, neurotensin, CCK, VIP, serotonin, glutamate (e.g., NMDA receptor, AMPA receptor), GABA, acetylcholine, adenosine (e.g., A2A receptor), cannabinoid receptor, natriuretic peptide (e.g., ANP, BNP, CNP) and endorphin intracellular signaling pathways.
• basal ganglia striatum
• nitric oxide e.g., noradrenergic
• neurotensin e.g., CCK
• VIP serotonin
• glutamate e.g., NMDA receptor, AMPA receptor
• GABA e.g., NMDA receptor, AMPA receptor
• acetylcholine e.g
• Phosphodiesterase (PDE) activity in particular, phosphodiesterase 1
• PDEl PDEl activity
• functions in brain tissue as a regulator of locomotor activity and learning and memory PDEl is a therapeutic target for regulation of intracellular signaling pathways, preferably in the nervous system, including but not limited to a dopamine Dl receptor, dopamine D2 receptor, nitric oxide, noradrenergic, neurotensin, CCK, VIP, serotonin, glutamate (e.g., NMDA receptor, AMPA receptor), GABA, acetylcholine, adenosine (e.g., A2A receptor), cannabinoid receptor, natriuretic peptide (e.g., ANP, BNP, CNP) or endorphin intracellular signaling pathway.
• a dopamine Dl receptor dopamine D2 receptor
• nitric oxide noradrenergic
• neurotensin CCK
• VIP neurotensin
• serotonin glutamate (e.g., NMDA receptor, AMPA receptor)
• inhibition of PDElB may potentiate the effect of a dopamine Dl agonist by protecting cGMP and cAMP from degradation, and similarly inhibit dopamine D2 receptor signaling pathways, by inhibiting PDEl activity.
• PDEl inhibitors are therefore potentially useful in diseases characterized by reduced dopamine Dl receptor signaling activity. See generally, WO 03/020702.
• EP 0201 188 and EP 0911333 disclose certain 1 ,3,5,-substituted, 6,7-dihydro-1H-pyrazoIo[4,3- ⁇ /
• PCT/US2006/33179 discloses the use of 1,3, 5, -substituted, 6,7-dihydro-1H-pyrazoIo[4,3-(/
• PCT/US2006/022066 discloses PDEl inhibitors which are 7,8- dihydro-[1H or 2H]-imidazo[1,2- ⁇ ]pyrazolo[4,3-e]pyrimidin-4(5H)-ones or 7,8,9- trihydro-[lHor 2H]-pyrimido [1,2-a]pyrazolo[4,3-e]pyrimidin-4(5 ⁇ )-ones, but does not specifically disclose their use for the treatment of schizophrenia.
• PDEI inhibitors are useful to treat psychosis, for example conditions characterized by psychotic symptoms such as hallucinations, paranoid or playful delusions, or disorganized speech and thinking, e.g., schizophrenia, schizoaffective disorder, schizophreniform disorder, psychotic disorder, delusional disorder, and mania, such as in acute manic episodes and bipolar disorder.
• PDEl inhibitors typically have their antagonistic activity at the dopamine D2 receptor.
• PDEl inhibitors primarily act to enhance signaling at the dopamine Dl receptor.
• Dl receptor signaling By enhancing Dl receptor signaling, PDEl inhibitors can increase NMDA receptor function in various brain regions, for example in nucleus accumbens neurons and in the prefrontal cortex. This enhancement of function may be seen for example in NMDA receptors containing the NR2B subunit, and may occur e.g., via activation of the Src and protein kinase A family of kinases.
• PDEl inhibitors useful in the present invention are described more fully below. They include for example
• [2H]-pyrazolo[3,4-d] pyrimidine-4,6(5H, 7H)-diones, in free, salt or prodrug form wherein the (optionally)hetero aryl moiety at the 2-position is preferably benzyl or pryidyl methyl para-substituted relative to the point of attachment with aryl or heteroaryl, e.g., substituted with phenyl, pyridyl or thiadiazolyl, and the 1 - or 2- position substituent is preferably substituted benzyl or pyridylmethyl, e.g.
• the invention thus provides a new method of treatment for psychosis, e.g., schizophrenia, comprising administering an effective amount of a phosphodiesterase- 1 (PDEl) inhibitor to a patient in need thereof.
• PDEl inhibitors include, for example, 7,8-dihydro-[lHor 2H]-imidazo[1,2- ⁇ ]pyrazolo[4,3- £]pyrimidin-4(5H)-ones or 7,8,9-trihydro-[1H or 2H]-pyrimido [1,2-a]pyrazolo[4,3- e]pyrimidin-4(5 ⁇ )-ones, substituted at the 1 or 2 position with C 2-9 alkyl or C 3 - 9 cycloalkyl, or optionally substituted heteroarylalkyl or substituted arylalkyl, in free, salt or prodrug form (hereinafter a PDE 1 Inhibitor, e.g., as described below) or a 1,3,5-substituted
• PDEl inhibitors include I- or 2-substituted
• PDEl inhibitors include 1- or 2- or 7-
• PDEl inhibitors also include, for example, substituted imidazo[2,l- b]purin-4-one, e.g., (6aR,9aS)-2-(biphenyl-4-ylmethyl)-5,6a,7,8,9,9a-hexahydro-5- methyl-3(phenylmethyl)-cyclopent-[4,5]imidazo-[2,l-b]purin-4(3H)-one, (6aR,9aS)- S. ⁇ aJ j S ⁇ a-hexahydro-S-methyl-l ⁇ -bisCphenylmethyOcyclopent- [4,5] imidazo-[2, 1 -b]purin-4(3H)-one, 5 ' -methyl-2 ' ,3 '- bis(phenylmethyl)spiro[cyclopentane-l,7'(8' ⁇ )-[3 ⁇ ]imidazo[2,l-b]purin]-4'(5' ⁇ )- one
• PDEl phosphodiesterase 1
• the PDE 1 Inhibitors for use in the methods of treatment described herein are a 7,8-dihydro-[lHor 2H]-imidazo[l ,2-a]pyrazolo[4,3- e]pyrimidin-4(5H)-ones or 7,8,9-trihydro-[lHor 2H]-pyrimido [1,2-a]pyrazolo[4,3- e]pyrimidin-4(5 ⁇ )-ones, of formula I
• Ri is H or C M alkyl (e.g., methyl);
• R 4 is H or C M alkyl and R 2 and R 3 are, independently, H or C M alkyl
• R 2 and R 3 are both methyl, or R 2 is H and R 3 is isopropyl
• aryl, heteroaryl, (optionally hetero)arylalkoxy, or (optionally hetero)arylalkyl e.g., R 2 and R 3 are both methyl, or R 2 is H and R 3 is isopropyl
• R 2 is H and R 3 and R 4 together form a di-, tri- or tetramethylene bridge
• R 5 is a substituted heteroarylalkyl, e.g., substituted with haloalkyl or
• R 5 is attached to one of the nitrogen atoms on the pyrazolo portion of Formula
• X, Y and Z are, independently, N or C
• R 8 , R 9 , R 1 1 and R, 2 are independently H or halogen (e.g., Cl or F)
• Rio is halogen, alkyl, cycloalkyl, haloalkyl (e.g., trifluoromethyl), aryl (e.g., phenyl), heteroaryl (e.g., pyridyl (for example pyrid-2-yl), or thiadiazolyl (e.g., 1,2,3-thiadiazol-4-yl)), diazolyl, triazolyl, tetrazolyl, arylcarbonyl (e.g., benzoyl), alkylsulfonyl (e.g., methylsulfonyl), heteroarylcarbonyl, or alkoxycarbonyl; provided that when X, Y, or Z is nitrogen, R 8 , R9, or Rio, respectively, is not
• the invention further provides the use of PDE 1 Inhibitors of
• R 4 is H or C M alkyl and at least one of R 2 and R 3 is lower alkyl, such that when the carbon carrying R 3 is chiral, it has the R configuration, e.g., wherein both R 2 and R 3 are methy), or wherein one is hydrogen and the other isopropyl;
• R 4 is H and at least one of R 2 and R 3 is arylalkoxy;
• Ri is methyl
• R 2 , R 3 , and R 4 are H
• n l
• Ri 3 and R H are, independently, H or C 1-4 alkyl (e.g., methyl or isopropyl);
• R 5 is a moiety of Formula Q wherein R 8 , R 9 , R] 1 , and R] 2 are, independently, H or halogen, and Rio is haloalkyl;
• R 6 is phenylamino or phenylalkylamino (e.g., benzylamino);
• the compounds inhibit phosphodiesterase-mediated (e.g., PDEl -mediated, especially PDE IB- mediated) hydrolysis of cGMP, e.g., with an IC 50 of less than l ⁇ M, preferably less than 25 nM in an immobilized-metal affinity particle reagent PDE assay, for example, as described in Example 1 ; in free or salt form.
• the PDE 1 Inhibitors include 7,8-dihydro-[lHor 2H]- imidazo[l ,2-o]pyrazolo[4,3-e]pyrimidin-4(5H)-ones of Formula Ia
• Ri is ⁇ or C 1-4 alkyl [e.g., methyl];
• R 4 is ⁇ and R 2 and R 3 are, independently, ⁇ or C 1-4 alkyl [e.g., R 2 and R 3 are both methyl, or R 2 is ⁇ and R 3 is isopropyl], aryl, or arylalkyl;
• R2 is ⁇ and R 3 and R 4 together form a di-, tri- or tetramethylene bridge [pref. wherein the R 3 and R 4 have the cis configuration, e.g., where the carbons carrying R 3 and R 4 have the R and S configurations respectively];
• R 5 is attached to one of the nitrogen atoms on the pyrazolo portion of formula Ia and is a substituted benzyl of formula Qa
• R 8 , R 9 , R 11 and Rn are independently H or halogen (e.g., Cl or F); and Rio is halogen, alkyl, cycloalkyl, haloalkyl (e.g., trifluoromethyl), aryl (e.g., phenyl), heteroaryl (e.g., pyridyl (for example pyrid-2-yl), or thiadiazolyl (e.g., 1,2,3-thiadiazol-4-yl)), arylcarbonyl (e.g., benzoyl), alkyl sulfonyl or heteroarylcarbonyl; and
• halogen e.g., Cl or F
• Rio is halogen, alkyl, cycloalkyl, haloalkyl (e.g., trifluoromethyl), aryl (e.g., phenyl), heteroaryl (e.g., pyridyl (for example pyr
• R 6 is H, alkyl, aryl, heteroaryl, arylalkyl [e.g., benzyl], arylamino [e.g., phenylamino], heteroarylamino, arylalkylamino, N,N-dialkylamino, N,N- diarylamino, or N-aryl-N-(arylalkyl)amino [e.g. N-phenyl-N-(l ,l '-bi ⁇ hen-4- ylmethyl)amino];
• the invention further provides the use of PDE 1 Inhibitors of Formula
• R 4 is H and at least one of R 2 and R 3 is lower alkyl, such that when the carbon carrying R 3 is chiral, it has the R configuration, e.g., wherein both R 2 and R 3 are methyl, or wherein one is hydrogen and the other isopropyl;
• Formula Ia or 2.1 wherein R 2 is H and R 3 and R 4 together form a tri- or tetramethylene bridge, having the cis configuration, preferably wherein the carbons carrying R ⁇ and R ⁇ have the R and S configurations respectively;
• 2.4 Formula Ia, 2.1 , 2.2 or 2.3 wherein R 5 is a moiety of formula Qa wherein R 8 , R 9 , Rn, and Ri 2 are H and Rio is phenyl;
• the PDE 1 Inhibitors are compounds of
• R 2 , R 3 and R 4 are H;
• R 5 is a moiety of Formula Q wherein R 8 , R 9 , Rn and R )2 are H and Ri 0 is phenyl, pyridyl (for example pyrid-2-yl), or thiadiazolyl (e.g., 1,2,3- thiadiazol-4-yl);
• R 6 is benzyl, phenylamino or benzylamino; in free or salt form.
• the PDE 1 Inhibitors are compounds of
• R 2 is H and R 3 and R 4 together form a tri-or tetra-methylene bridge
• R 2 and R 3 are methyl, isopropyl or arylalkoxy and R 4 is H; or R 2 and R 3 are H and R 4 is a C M alkyl;
• R 5 is a substituted heteroarylmethyl, e.g., para-substituted with haloalkyl; or
• R5 is a moiety of Formula Q wherein Rg, R9, Ri 1 and R12 are H or halogen and R 10 is haloalkyl, phenyl, pyridyl (for example pyrid-2-yI), or thiadiazolyl (e.g., 1,2,3-thiadiazol-4-yl); and
• R 6 is benzyl, phenylamino or benzylamino; in free or salt form.
• the PDE 1 Inhibitors are compounds of
• R 2 is H and R 3 and R 4 together form a tri- or tetra-methylene bridge
• R 3 and R 4 are each methyl and R 4 is H; or
• R 2 and R 4 are H and R 3 is isopropyl [pref. the carbon carrying R 3 having the R configuration];
• R 5 is a moiety of Formula Qa wherein R 8 , R 9 , Rn, and Ri 2 are H and
• Rio is haloalkyl, phenyl, pyridyl (for example pyrid-2-yl), or thiadiazolyl
• R 6 is benzyl, phenylamino or benzylamino; in free or salt form.
• the PDE 1 Inhibitors are compounds of
• PDE 1 Inhibitors include compounds according to
• R a and R b are, independently, H or C 1 . 4 alkyl
• R ⁇ is phenylamino or benzylamino
• Rio is phenyl, pyridyl (for example pyrid-2-yl), or thiadiazolyl (e.g., 1,2,3- thiadiazol-4-yl); in free or salt form.
• R 2 is H and R 3 and R 4 together form a tri- or tetra-methylene bridge [pref. with the carbons carrying R 3 and R 4 having the R and S configuration respectively]; or at least one of R 2 and R 3 is methyl, isopropyl or arylalkoxy and R 4 is H; or
• R 2 and R 3 are H and R 4 is a C 1-4 alkyl
• R ⁇ is phenylamino or benzylamino
• Rio is haloalkyl, phenyl, pyridyl (for example pyrid-2-yl), or thiadiazolyl (e.g.,
• R 2 is H and R 3 and R 4 together form a tri- or tetra-methylene bridge [pref. with the carbons carrying R 3 and R 4 having the R and S configuration respectively]; or at least one of R 2 and R 3 is methyl, isopropyl or arylalkoxy and R 4 is H; or
• R 2 and R 3 are H and R 4 is a C 1-4 alkyl
• R 6 is phenylamino or benzylamino
• Rio is phenyl, pyridyl (for example pyrid-2-yl), or thiadiazolyl (e.g., 1,2,3- thiadiazol-4-yl); in free or salt form.
• PDE 1 Inhibitors used in the method disclosed herein also include compounds according to Formula V:
• R 2 is H and R 3 and R4 together form a tri- or tetra-methylene bridge [pref. with the carbons carrying R 3 and R 4 having the R and S configuration respectively]; or R 2 and R 3 are each methyl and R 4 is H; or R 2 and R 4 are H and R 3 is isopropyl [pref. the carbon carrying R 3 having the R configuration];
• R 6 is phenylamino or benzylamino
• Rio is phenyl, pyridyl, or thiadiazolyl; in free or salt form.
• the PDE 1 Inhibitors for use in the methods of treatment described herein are 1- or 2-substituted (6aR*,9aS*)-3- (phenylamino)-5-6a,7,8,9,9a-hexahydro-5-methyl-cyclopent[4,5]irnidazo[1,2- a]pyrazolo[4,3-e]pyrimidin-4(7Hor 2H)-one of Formula XII:
• X is C 1-6 alkylene (e.g., methylene, ethylene or prop-2-yn-1-ylene);
• Y is a single bond, alkynylene (e.g., -O ⁇ C-), arylene (e.g., phenylene) or heteroarylene (e.g., pyridylene);
• Z is H, aryl (e.g., phenyl), heteroaryl (e.g., pyridyl, e.g., pyrid-2-yl), halo (e.g., F, Br, Cl), haloC 1-6 alkyl (e.g., trifluoromethyl), -C(O)-R 1 , - N(R 2 )(R 3 ), or C 3-7 cycloalkyl optionally containing at least one atom selected from a group consisting of N or O (e.g., cyclopentyl, cyclohexyl, tetrahydro-2H-pyran-4-yl, or morpholinyl);
• aryl e.g., phenyl
• heteroaryl e.g., pyridyl, e.g., pyrid-2-yl
• halo e.g., F, Br, Cl
• R 1 is C ⁇ -6 alkyl, haloC )-6 alkyl, -OH or -OC 1-6 alkyl (e.g., -OCH 3 );
• R 2 and R 3 are independently H or Ci-6alkyl
• R 4 and R 5 are independently H, d -6 alky or aryl (e.g., phenyl) optionally substituted with one or more halo (e.g., fluorophenyl, e.g., 4-fluorophenyl) or hydroxy (e.g., hydroxyphenyl, e.g., 4- hydroxyphenyl or 2 -hydroxyphenyl);
• halo e.g., fluorophenyl, e.g., 4-fluorophenyl
• hydroxy e.g., hydroxyphenyl, e.g., 4- hydroxyphenyl or 2 -hydroxyphenyl
• X, Y and Z are independently and optionally substituted with one or more halo (e.g., F, Cl or Br), Ci ⁇ alkyl (e.g., methyl), haloCi. 6alkyl (e.g., trifluoromethyl), for example, Z is heteroaryl, e.g., pyridyl substituted with one or more halo (e.g., 6-fluoropyrid-2-yl, 5- fluoropyrid-2-yl, 6-fluoropyrid-2-yl, 3-fluoropyrid-2-yl, 4-fluoropyrid- 2-yl, 4,6-dichloropyrid-2-yl), haloCi- ⁇ alkyl (e.g., 5- trifluoromethylpyrid-2-yl) or C 1-6 alkyl (e.g., 5-methylpyrid-2-yl), or Z is aryl, e.g., phenyl, substituted with one or more hal
• the PDE 1 Inhibitor of Formula XII for use in the methods of treatment described herein is selected from any of the following:
• V — ⁇ and in free or salt form.
• the PDE 1 Inhibitors for use in the methods of treatment described herein are compounds of Formula XIII:
• X is Ci ⁇ alkylene (e.g., methylene, ethylene or prop-2-yn-l -ylene);
• Y is a single bond, alkynylene (e.g., -C ⁇ C-), arylene (e.g., phenylene) or heteroarylene (e.g., pyridylene);
• Z is H, aryl (e.g., phenyl), heteroaryl (e.g., pyrid-2-yl), halo (e.g., F,
• haloC M alkyl e.g., trifluoromethyl
• R 1 is C 1-4 alkyl, haloC,. 4 alkyl;
• R 2 and R 3 are independently H or C ⁇ -4 alkyl,
• X, Y and Z are independently and optionally substituted with halo (e.g., F, Cl or Br), for example, Z is pyrid-2-yl substituted with fluoro (e.g., 6-fluoro-pyrid-2-yl), in free, salt or prodrug form, including its enantiomers, diastereoisomers and racemates.
• halo e.g., F, Cl or Br
• Z is pyrid-2-yl substituted with fluoro (e.g., 6-fluoro-pyrid-2-yl), in free, salt or prodrug form, including its enantiomers, diastereoisomers and racemates.
• the PDE 1 Inhibitors for use in the methods of treatment described herein are compounds of Formula XlV:
• Ri is H or Cue alkyl (e.g., methyl);
• R 4 is H or Ci- 6 alkyl and R 2 and R 3 are, independently, H or C 1- 6 alkyl optionally substituted with halo or hydroxyl (e.g., R 2 and R 3 are both methyl, or R 2 is H and R 3 is ethyl, isopropyl or hydroxyethyl), aryl, heteroaryl, (optionally hetero)arylalkoxy, or (optionally hetero)arylC ⁇ -6alkyl; or R 2 is H and R 3 and R 4 together form a di-, tri- or tetramethylene bridge (pref. wherein the R 3 and R 4 together have the cis configuration, e.g., where the carbons carrying R 3 and R 4 have the R and S configurations, respectively);
• R 5 is a substituted heteroarylCi. 6 alkyl, e.g., substituted with C 1- 6 haloalkyl; R 5 is -D-E-F, wherein:
• D is Ci. 6 alkylene (e.g., methylene, ethylene or prop-2-yn-1- ylene); E is a single bond, alkynylene (e.g., -C ⁇ C-), arylene (e.g., phenylene) or heteroarylene (e.g., pyridylene); F is H, aryl (e.g., phenyl), heteroaryl (e.g., pyridyl, e.g., pyrid-2-yl), halo (e.g., F, Br, CI), haloC 1-6 alkyl (e.g., trifluoromethyl), -C(O)-Ri 5 , -N(Ri 6 )(R 17 ), or C 3 .
• E is a single bond, alkynylene (e.g., -C ⁇ C-), arylene (e.g., phenylene) or heteroarylene (e.g
• 7cycloalkyl optionally containing at least one atom selected from a group consisting of N or O (e.g., cyclopentyl, cyclohexyl, tetrahydro-2H-pyran-4-yl, or morpholinyl); wherein D, E and F are independently and optionally substituted with one or more halo (e.g., F, Cl or Br), C).
• N or O e.g., cyclopentyl, cyclohexyl, tetrahydro-2H-pyran-4-yl, or morpholinyl
• D, E and F are independently and optionally substituted with one or more halo (e.g., F, Cl or Br), C).
• 6alkyl e.g., methyl
• haloCi- ⁇ alkyl e.g., trifluoromethyl
• Z is heteroaryl, e.g., pyridyl substituted with one or more halo (e.g., 6- fluoropyrid-2-yl, 5-fluoropyrid-2-yl, 6-fluoropyrid-2-yl, 3-fluoropyrid-2-yl, 4-fluoropyrid-2-yl, 4,6- dichloropyrid-2-yl), haloC ⁇ alkyl (e.g., 5- trifluoromethylpyrid-2-yl) or C ⁇ -6 alkyl (e.g., 5- methylpyrid-2-yl), or Z is aryl, e.g., phenyl, substituted with one or more halo (e.g., 4-fluorophenyl); or
• R 5 is attached to one of the nitrogens on the pyrazolo portion of Formula XIV and is a moiety of Formula A wherein X, Y and Z are, independently, N or C, and Rg, R 9 , Rn and Ri 2 are independently H or halogen (e.g., Cl or F), and Rio is halogen, alkyl, cycloalkyl, haloalkyl (e.g., trifiuoromethyi), aryl (e.g., phenyl), heteroaryl (e.g., pyridyl (for example pyrid-2-yl), or thiadiazolyl (e.g., 1,2,3- thiadiazol-4-yl)), diazolyl, triazolyl, tetrazolyl, arylcarbonyl (e.g., benzoyl), alkylsulfonyl (e.g., methylsulfonyl), heteroarylcarbonyl, or
• R 6 is H, alkyl, aryl, heteroaryl, arylalkyl (e.g., benzyl), arylamino (e.g., phenylamino), heterarylamino, N 5 N- dialkylamino, N,N-diarylamino, or N-aryl-N- (arylaky])amino (e.g., N-phenyl-N-(l,l '-biphen-4- ylmethyl)amino); or
• Re is -N(R I S )(R
• R ⁇ and R M are, independently, H or Cj-6 alkyl, aryl, heteroaryl, (optionally hetero)arylalkoxy or (optionally hetero)arylalkyl;
• R 15 is C
• 6 and Rp are independently H or Ci ⁇ alkyl; in free, salt or prodrug form.
• the PDE I Inhibitor of Formula XIV for use in the methods of treatment described herein is:
• the PDE I Inhibitors for use in the methods of treatment described herein are compounds of Formula XV:
• . 6 alkyl e.g., isopropyl, isobutyl, 2-methylbutyl, 2,2-dimethyl propyl.
• C 3 - 8 cycloalkyl e.g., cyclopentyl, cyclohexyl
• one or more amino e.g., -NH 2
• 2-aminocyclopentyI or 2-aminocycIohexyI e.g., 2-aminocyclopentyI or 2-aminocycIohexyI
• heterocycloalkyl e.g., pyrrolidinyl, for example, pyrrolidin-3-yl
• Ci ⁇ alkyl e.g., methyl
• Ci ⁇ haloalkyl e.g., trifluoromethyl, 2,2,2-trifluoroethyl
• Co. 6 alkylaminoC 0-6 alkyl e.g., 2-(dimethylamino)ethyl, 2- aminopropyl
• hydroxyCi hydroxyCi.
• 6 alkyl e.g., 3-hydroxy-2-methylpropyl
• arylC 0-6 alkyl e.g., benzyl
• heteroarylalkyl e.g., pyridylmethyl
• . 6 alkyl e.g., 4-methoxybenzyl
• -G-J wherein:
• G is a single bond or, alkylene (e.g., methylene); J is cycloalkyl or heterocycloalkyl (e.g., oxetan-2-yl, pyrolyin-3-yl, pyrolyin-2-yl) optionally substituted with alkyl (e.g., (l-methylpyrolidin-2-yl)); (iii) R 3 is a) D-E-F wherein
• D is single bond, Ci -6 alkylene (e.g., methylene), or arylCi ⁇ alkylene (e.g., benzylene or -CH 2 CgH 4 -);
• E is a Ci ⁇ alkylene (e.g., methylene, ethynylene, prop-2- yn-1-ylene), arylene (e.g., phenylene Or -C 6 H 4 -), C
• 6 alkyl e.g., isobutyl, isopropyl
• aryl e.g., phenyl
• heteroaryi e.g., 1,2,4-triazoIyI, imidazolyl, pyridyl
• Ci -6 alkyl for example, pyrid-2-yl, imidazol-1-yl, 4-methylimidazolyl, 1 - methyIimidazol-2-yl, 1,2,4-triazol-l-yl, heteroCa.gcycloaikyl (e.g., piperidinyl, pyrrolidinyl) optionally substituted with Ci ⁇ alkyl (e.g., methyl), for example, pyrrolidin-1 -yl, pyrrolidin-2-yl, 1- methylpyrrolidin-2-yl, piperidin-2-yl, 1- methylpiperidin-2-yl, 1 -ethylpiperidin
• R 3 is a substituted heteroarylalkyl, e.g., substituted with C 1- 6 haloalkyl; or c) R 3 is attached to one of the nitrogen atoms on the pyrazolo portion of Formula XV and is a moiety of Formula A
• X, Y and Z are, independently, N or C
• R 8 , R 9 , Ri 1 and Ri 2 are independently H or halogen (e.g., Cl or F); and Rio is halogen, Ci ⁇ alkyl, C 3-8 cycloalkyl, Ci ⁇ haloalkyl (e.g., trifluoromethyl), aryl (e.g., phenyl), heteroaryl (e.g., pyridyl, (for example, pyrid-2-yl) or e.g., thiadiazolyl (for example, l,2,3-thiadiazol-4-yl), diazolyl, triazolyl (e.g., 1,2,4-triazol-l - yl), tetrazolyl (e.g., tetrazol-5-yl), C
• halogen e.g., Cl or F
• Rio is halogen, Ci ⁇ alkyl, C 3-8 cycloalky
• alkoxadiazolyl e.g., 5- methyl-l,2,4-oxadiazol
• pyrazolyl e.g., pyrazol-1-yl
• C 1- 6 alkyl sulfonyl e.g., methyl sulfonyl
• arylcarbonyl e.g., benzoyl
• heteroarylcarbonyl C 1-6 alkoxycarbonyl, (e.g., methoxycarbonyl), aminocarbonyl; preferably phenyl or pyridyl, e.g., 2-pyridyl; provided that when X, Y or X is nitrogen, Rs, R9 or Ri 0 , respectively, is not present;
• R 4 is aryl (e.g., phenyl) optionally substituted with one or more halo (e.g., F or Cl) or hydroxyl, heteroaryl (e.g., pyrid-4-yl, pyrid-2-yl or pyrazol-3-yl) or heteroC3.
• halo e.g., F or Cl
• heteroaryl e.g., pyrid-4-yl, pyrid-2-yl or pyrazol-3-yl
• heteroC3 e.g., pyrid-4-yl, pyrid-2-yl or pyrazol-3-yl
• R 5 is H, Ci- 6 alkyl, C 3-8 cycloalkyl (e.g., cyclopentyl), heteroaryl, aryl, p-benzylaryl (e.g., biphenyl-4-ylmethyl); wherein "alk”, “alkyl”, “haloalkyl” or “alkoxy” refers to C 1-6 alkyl and "cycloalkyl” refers to C 3 - S CyC loalky I; in free, salt or prodrug form.
• PDE 1 Inhibitors of Formula XV for use in the methods of treatment described herein are as follows:
• R 2 is H; C 1-6 alkyl (e.g., isopropyl, isobutyl, 2-methylbutyl, 2,2-dimethyl propyl); C 3-8 cycloalkyl (e.g., cyclopentyl, cyclohexyl) optionally substituted with one or more amino (e.g., -NH 2 ), for example, 2-aminocyclopentyl or 2-aminocyclohexyl); C 3 . sheterocycloalkyl (e.g., pyrrolidinyl, for example, pyrrolidin-3- yl) optionally substituted with Ci.
• C 1-6 alkyl e.g., isopropyl, isobutyl, 2-methylbutyl, 2,2-dimethyl propyl
• C 3-8 cycloalkyl e.g., cyclopentyl, cyclohexyl
• one or more amino e.g., -NH 2
• alkyl e.g., methyl
• Ca-scycloalkyl-C t - ⁇ alkyl e.g.jCyclopropylmethyl
• e.g., methyl
• alkyl e.g., trifluoromethyl, 2,2,2-trifluoroethyl
• Co-ealkylaminoCo- ⁇ alkyl e.g., 2- (dimethylamino)ethyl, 2-aminopropyl), hydroxyCi ⁇ alkyl (e.g., 3-hydroxy-2-methylpropyl
• arylCo- ⁇ alkyi e.g., benzyl
• heteroarylalkyl e.g., pyridylmethyl
• alkoxyarylalkyl e.g., 4-methoxybenzyl
• -G-J wherein:G is a single bond or, alkylene (e.g., methylene) and J is cycloalkyl or heterocycloalkyl (e.g., oxetan-2-yl, pyrolyin-3-yl, pyrolyin-2- yl) optionally substituted with alkyl (e
• R 2 is isopropyl, isobutyl, 2,2- dimethylpropyl, or 2-methyIbutyl
• R 2 is C 1- 6 alkoxyarylCi. 6 alkyl (e.g., Ci-ealkoxybenzyl);
• R 2 is C 3- gheterocycloalkyl (e.g., pyrrolidinyl, for example, pyrrolidin-3- yl) optionally substituted with C 1-5 alkyl (e.g., methyl), for example, 1 -methylpyrrolidin-3-yl;
• R 2 is C 3- gheterocycloalkyl (e.g., pyrrolidinyl, for example, pyrrolidin-3- yl) optionally substituted with C 1-5 alkyl (e.g., methyl), for example, 1 -methylpyrrolidin-3-yl;
• R 2 is C 0- 6 aikylaminoC 0-6 alkyl (e.g., 2-(dimethy(amino)ethyI, 2- aminopropyl);
• R 2 is arylC 0-6 alkyl (e.g., benzyl);
• R 2 is -G-J wherein: G is a single bond or, C 1-6 alkylene (e.g., methylene) and J is cycloalkyl or heterocycloalkyl (e.g., oxetan-2-yl, pyrolyin-3-yl, pyrolyin-2-yl) optionally substituted with alkyl (e.g., (1- methylpyrolidin-2-yl));
• D is single bond, Ci-6alkylene (e.g., methylene), or arylCi- ⁇ alkylene (e.g., benzylene or -CH 2 C 6 H 4 -
• E is C 1-6 aikylene (e.g., methylene, ethynylene, prop-2-yn-1-ylene), arylene (e.g., phenylene or -C 6 H 4 -), Ci ⁇ alkylarylene (e.g., -benzylene- or- CH 2 C 6 H 4 -), aminoCi. 6 alkylene (e.g., -CH 2 N(H)-) or amino (e.g., -N(HH;
• F is d. 6 alkyl (e.g., isobutyl, isopropyl); aryl (e.g., phenyl); heteroaryl (e.g., 1,2,4- triazolyl, imidazolyl, pyridyl) optionally substituted with C 1- ⁇ alkyl, for example, pyrid-2-yl, imidazol-1 -yl, 4- methylimidazolyl, l-methylimidazol-2-yl, 1,2,4-triazol-1-yl; heteroC 3-8 cycloalkyl (e.g., piperidinyl, pyrrolidinyl) optionally substituted with C].
• alkyl e.g., isobutyl, isopropyl
• aryl e.g., phenyl
• heteroaryl e.g., 1,2,4- triazolyl, imidazolyl, pyridyl
• 6 alkyl e.g., methyl
• pyrrolidin-1-yl pyrrolidin-2-yl, l-methylpyrrolidin-2-yl, piperidin-2-yl, l-methylpiperidin-2-yl, l-ethylpiperidin-2-yl
• amino e.g., -NH 2
• C 1-6 alkoxy e.g., C 1-6 alkoxy
• -O-haloC 1-6 alkyl e.g., -O- CF 3
• Formula 15.51 wherein F is heteroC 3-8 cycloalkyl (e.g., piperidinyl, pyrrolidinyl) optionally substituted with C 1-6 alkyl (e.g., methyl), for example, pyrrolidin-1-yl, pyrrolidin-2-yl, 1- methylpyrrolidin-2-yl, piperidin-2-yl, l-methylpiperidin-2-yl, 1 -ethylpiperidin-2-yl; 15.60.
• F is pyrrolidin-1-yl;
• F is heteroaryl (e.g., 1,2,4-triazolyl, imidazolyl, pyridyl) optionally substituted with C
• heteroaryl e.g., 1,2,4-triazolyl, imidazolyl, pyridyl
• . 6 alkyl for example, pyrid-2-yl, imidazol-1-yl, 4-methylimidazol-1-yl, 1- methylimidazol-2-yl, 1,2,4-triazol-1-yl;
• R 3 is a substituted heteroarylalkyl, e.g., substituted with C 1-6 haloalky;
• R 4 aryl (e.g., phenyl) optionally substituted with one or more halo (e.g., F or Cl) or hydroxy!, heteroaryl (e.g., pyrid-4-yl, pyrid-2-yi or pyrazol-3- yl) or heteroCs- ⁇ Cycloalkyl (e.g., pyrrolidin-3-yl);
• R 4 is aryl (e.g., phenyl), heteroaryl (e.g., pyrid-4-yl, pyrid-2-yl or pyrazol-3-yl) or heterocycloalkyl (e.g., pyrrolidin-3-yl);
• R 4 is aryl (e.g., phenyl) optionally substituted with one or more halo or hydroxy 1;
• R 5 is H, C 1-6 alkyl, C 3 . scycloalkyl (e.g., cyclopentyl), heteroaryl, aryl, p-benzylaryl (e.g., biphenyl-4-ylmethyl);
• any one of the preceding formulae wherein the compounds inhibit phosphodiesterase-mediated (e.g., PDEl -mediated, especially PDE IB-mediated) hydrolysis of cGMP e.g., with an IC 50 of less than 1 ⁇ M, preferably less than preferably less than 250 nM, preferably less than 50 nM, more preferably less than 25 nM in an immobilized-metal affinity particle reagent PDE assay, for example, as described in Example 1 below; such compounds according to any of the preceding formulae being in free, salt or prodrug form.
• the PDE 1 Inhibitors for use in the methods of treatment described herein are compounds of Formula XVI:
• Ri is H or C 1-6 alkyl (e.g., methyl);
• R 2 is H, alkyl (e.g., isopropyl, isobutyl, 2-methylbutyl, 2,2-dimethyl propyl), cycloalkyl (e.g., cyclopentyl, cyclohexyl), haloalkyl (e.g., trifluoromethyl, 2,2,2 -trifluoroethyl), alkylaminoalkyl (e.g., 2- (dimethylamino)ethyl), hydroxyalkyl (e.g., 3-hydroxy-2-methyl propyl), arylalkyl (e.g., benzyl), heteroarylalkyl (e.g., pyridylmethyl), or alkoxyarylalkyl (e.g., 4-methoxybenzyl);
• alkyl e.g., isopropyl, isobutyl, 2-methylbutyl, 2,2-dimethyl propyl
• cycloalkyl
• R 3 is D-E-F wherein
• D is single bond, C]. 6 alkylene (e.g., methylene), or arylCi. 6alkylene (e.g., benzylene or -CH 2 C 6 H 4 -);
• E is a C 1-6 alkylene (e.g., methylene, ethynylene, prop-2- yn-1-ylene), arylene (e.g., phenylene Or -C 6 H 4 -), C 1- 6 alkylarylene (e.g., -benzylene- or -CH 2 C 6 H 4 -), aminoCu 6alkylene (e.g., -CH 2 N(H)-) or amino (e.g., -N(H)-); and
• C 1 -6 alkyl e.g., isobutyl, isopropyl
• aryl e.g., phenyl
• heteroaryl e.g., 1,2,4-triazolyl, imidazolyl, pyridyl
• C] -6 alkyl for example, pyrid-2-yl, imidazol-1-yl, 4-methylimidazolyl, 1 - methylimidazol-2-yl, 1,2,4-triazol-1-yl, heteroC 3-8 cycloalkyl (e.g., piperidinyl, pyrrolidinyl) optionally substituted with Ci.
• 6 alkyl e.g., methyl
• pyrrolidin-1 -yl pyrroIidin-2-yI
• 1- methylpyrrolidin-2-yl piperidin-2-yl
• 1- methylpiperidin-2-yl 1- methylpiperidin-2-yl
• 1 -ethylpiperidin-2-yl amino (e.g., -NH 2 ), C 1-6 alkoxy, or
• R 4 is aryl (e.g., phenyl), heteroaryl (e.g., pyrid-4-yl, pyrid-2-yl or pyrazol-3-yl) or heterocycloalkyl (e.g., pyrrolidin-3-yl); and (v) R.
• alkyl alkyl, cycloalkyl (e.g., cyclopentyl), heteroaryl, aryl, p- benzylaryl (e.g., biphenyl-4-ylmethyl); wherein "alk”, “alkyl”, “haloalkyl” or “alkoxy” refers to C 1-6 alkyl and "cycloalkyl” refers to C 3-8 cycloalkyl; in free, salt or prodrug form.
• cycloalkyl e.g., cyclopentyl
• heteroaryl aryl
• p- benzylaryl e.g., biphenyl-4-ylmethyl
• the PDE 1 Inhibitors for use in the methods of treatment described herein are compounds of Formula XVII
• R 1 is H or alkyl (e.g., methyl);
• R 2 is H, alkyl (e.g., isopropyl, isobutyl, 2-methylbutyl, 2,2-dimethyl propyl), cycloalkyl (e.g., cyclopentyl, cyclohexyl), haloalkyl (e.g., trifluoromethyl, 2,2,2-trifluoroethyl), alkylaminoalkyl (e.g., 2- (dimethylamino)ethyl), hydroxyalkyl (e.g., 3-hydroxy-2-methyl propyl), arylalkyl (e.g., benzyl), heteroarylalkyl (e.g., pyridylmethyl), or alkoxyarylalkyl (e.g., 4-methoxybenzyl); (iii) R. 3 is D-E-F wherein
• D is single bond, alkylene (e.g., methylene), or arylalkylene (e.g., benzylene or -CH 2 C O H 4 -);
• E is a alkylene (e.g., methylene, ethynylene, prop-2-yn-l- ylene), arylene (e.g., phenylene Or -CnH 4 -), alkylarylene (e.g., -benzylene- Or -CHiC 6 H 4 -), aminoalkylene (e.g., - CH 2 N(HH or amino (e.g., -N(H)-); and
• F is alkyl (e.g., isobutyl), aryl (e.g., phenyl), heteroaryl (e.g., pyrid-2-yl, 1 ,2,4-triazolyl), heteroC3- 6 cycloalkyl (e.g., pyrolidin- 1 -yl), amino (e.g., -NH 2 ), C ⁇ alkoxy, or - O-ha(oalkyl (e.g., -O-CF3); provided that when -D-E- is an heteroarylalkyl or arylalkyl (e.g., benzyl), F is not aryl or heteroaryl.
• alkyl e.g., isobutyl
• aryl e.g., phenyl
• heteroaryl e.g., pyrid-2-yl, 1 ,2,4-triazolyl
• heteroC3- 6 cycloalkyl e.
• R 4 is aryl (e.g., phenyl), heteroaryl (e.g., pyrid-4-yl, pyrid-2-yl or pyrazol-3-yl) or heterocycloalkyl (e.g., pyrrolidin-3-yl); and (v) R 5 is H, alkyl, cycloalkyl (e.g., cyclopentyl), heteroaryl, aryl, p- benzylaryl (e.g., biphenyi-4-yimethyl); wherein "a)k- ⁇ "alkyl". "haloalkyl " or “alkoxy” refers to C ⁇ -6 alkyl and "cycloalkyl” refers to C3.6 cycloalkyh in free, salt or prodrug form.
• aryl e.g., phenyl
• heteroaryl e.g., pyrid-4-yl, pyrid-2-yl or pyrazol-3-
• PDE 1 Inhibitors of Formula XVIi for use in the methods of treatment described herein are as follows:
• R 3 is D-E-F and D is single bond, alkylene (e.g., methylene), or arylalkylene (e.g., -benzylene- or - CH 2 C 6 H 4 -);
• heteroC ⁇ cycloalkyl e.g., pyrolidin-1-yl
• amine e.g., -NH 2
• alkoxy e.g., methoxy
• -O-haioalkyl -OCF 3
• R 4 is aryl (e.g., phenyl), heteroaryl (e.g., pyrid-4-yl, pyrid-2-yl or pyrazol- 3-yl) or heterocycloalkyl (e.g., pyrrolidin-3-yl);
• PDE 1 Inhibitors for use in the methods of treatment described herein are Compounds of Formula XVIII:
• (O R] is H or alkyl (e.g., methyl);
• G is a single bond or, alkylene (e.g., methylene);
• J is cycloalkyl or heterocycloalkyl (e.g., oxetan-2-yl, pyrolyin-3-yl, pyrolyin-2-yl) optionally substituted with alkyl (e.g., (1- methylpyrolidin-2-yl)); or
• C 3-8 cycloalkyl e.g., cyclopentyl, cyclohexyl substituted with one or more amino (e.g., -NH 2 ), for example, 2- aminocyclopentyl or 2-aminocycIohexyl
• C 3 - 8 heterocycloalkyl e.g., pyrrolidinyl, for example, pyrrolidin-3-yl
• Ci- ⁇ alkyl e.g., methyl
• l-methylpyrrolidin-3-yI C 3 - 8 cycloalkyl-C ⁇ - 6 alkyl (e.g.,cyclopropylmethyl), aminoC].
• 6 alkyl e.g., 2-aminopropyl
• J is not an unsubstituted cycloalkyl
• R 3 Is a) D-E-F wherein 1.
• D is single bond, C )-6 alkylene (e.g., methylene), or arylCj. 6alkylene (e.g., benzylene or -CH 2 C 6 H 4 -);
• E is a C
• ⁇ alkylarylene e.g., -benzylene- or -CH 2 C 6 H 4 -
• aminoCi. 6alkylene e.g., -CH 2 N(H)-
• amino e.g., -N(H)-
• C 1 -6 alkyl e.g., isobutyl, isopropyl
• aryl e.g., phenyl
• heteroaryl e.g., 1,2,4-triazolyl, imidazolyl, pyridyl
• Ci. 6 alkyl for example, pyrid-2-yl, imidazol-1-yl, 4-methylimidazolyl, 1- methylimidazol-2-yl, 1 ,2,4-triazol-1-yl, heteroC 3 .
• cycloalkyl e.g., piperidinyl, pyrrolidinyl
• -6 alkyl e.g., methyl
• pyrrolidin-1-yl pyrrolidin-2-yl
• pyrrolidin-2-yl 1- methylpyrrolidin-2-yl
• piperidin-2-yl 1- methylpiperidin-2-yl
• amino e.g., -NH 2
• R 3 is a substituted heteroarylaklyl, e.g., substituted with haloalkyl; or c) R 3 is attached to one of the nitrogen atoms on the pyrazolo portion of Formula XVIII and is a moiety of Formula A
• X, Y and Z are, independently, N or C, and Rs, R9, Ri 1 and Ri 2 are independently H or halogen (e.g., Cl or F); and Rio is halogen, alkyl, cycloalkyl, haloalkyl (e.g., trifluoromethyl), aryl (e.g., phenyl), heteroaryl (e.g., pyridyl, (for example, pyrid-2-yl) or e.g., thiadiazolyl (for example, 1,2,3-thiadiazol- 4-yl), diazolyl, triazolyl (e.g., 1,2,4-triazol-1-yl), tetrazolyl (e.g., tetrazol-5-yl), alkoxadiazolyl (e.g., 5-methyl-l ,2,4- oxadiazol), pyrazolyl (e.g., pyrazol-1-yl), alkyl
• R 4 is aryl (e.g., phenyl) optionally substituted with one or more halo (e.g., F or Cl) or hydroxyl, heteroaryl (e.g., pyrid-4-yl, pyrid-2-yl or pyrazol-3-yl) or heteroC 3-6 cycloalkyl (e.g., pyrrolidin-3-yl); and (vi) R 5 is H, Ci.
• halo e.g., F or Cl
• heteroaryl e.g., pyrid-4-yl, pyrid-2-yl or pyrazol-3-yl
• heteroC 3-6 cycloalkyl e.g., pyrrolidin-3-yl
• alkyl C 3-8 cycloalkyl (e.g., cyclopentyl), heteroaryl, aryl, p-benzylaryl (e.g., biphenyl-4-ylmethyl), wherein "alk”, “alkyl”, “haloalkyl” or “alkoxy” refers to C 1-6 alkyl and "cycloalkyl” refers to C 3-6 cycloalkyl; in free, salt or prodrug form.
• cycloalkyl e.g., cyclopentyl
• heteroaryl e.g., aryl
• p-benzylaryl e.g., biphenyl-4-ylmethyl
• the PDE 1 Inhibitors for use in the methods of treatment described herein are compounds of Formula XIX:
• R is H or alkyl (e.g., methyl);
• G is a single bond or, alkylene (e.g., methylene);
• J is cycloalkyl or heterocycloalkyl (e.g., oxetan-2-yl, pyrolyin-3-yl, pyrolyin-2-yl) optionally substituted with alkyl (e.g., (1- methylpyrolidin-2-yl)); provided that when G is a single bond, J is not cycloalkyl;
• heterocycloalkyl e.g., oxetan-2-yl, pyrolyin-3-yl, pyrolyin-2-yl
• alkyl e.g., (1- methylpyrolidin-2-yl
• R 3 is a) D-E-F wherein
• D is single bond, alkylene (e.g., methylene), arylalkylene (e.g., benzylene or -CH 2 C 6 H 4 -);
• E is a alkylene (e.g., methylene, ethynylene, prop-2-yn-1- ylene), arylene (e.g., phenylene or -C 6 H 4 -), alkylarylene (e.g., -benzylene- or -CH2C 6 H4-), aminoalkylene (e.g., - CH 2 N(H)-) or amino (e.g., -N(H)-); and
• alkylene e.g., methylene, ethynylene, prop-2-yn-1- ylene
• arylene e.g., phenylene or -C 6 H 4 -
• alkylarylene e.g., -benzylene- or -CH2C 6 H4-
• aminoalkylene e.g., - CH 2 N(H)-
• amino e.g., -N(H)-
• F is alkyl (e.g., isobutyl), aryl (e.g., phenyl), heteroaryl (e.g., pyrid-2-yl, 1,2,4-triazolyl), heteroC 3-6 cycloalkyl (e.g., pyrolidin-1-yl), amino (e.g., -NH 2 ), C 1-4 alkoxy, or - O-haloalkyl (e.g., -0-CF 3 );
• R 3 is a substituted heteroarylaklyl, e.g., substituted with haloalkyl; or c) R 3 is attached to one of the nitrogen atoms on the pyrazolo portion of Formula XIX and is a moiety of Formula A wherein X, Y and Z are, independently, N or C, and R 8 , R 9 , Ri i and Ri 2 are independently H or halogen (e.g., Cl or F); and Rio is halogen, alkyl, cycloalkyl, haloalkyl (e.g., trifluoromethyl), aryl (e.g., phenyl), heteroaryl (e.g., pyridyl, (for example, pyrid-2-yl) or e.g., thiadiazolyl (for example, 1,2,3-thiadiazoI- 4-yl), diazolyl, triazolyl (e.g., 1,2,4-triazol-1-
• the PDE 1 Inhibitors of Formula XIX for use in the methods of treatment described herein are as follows: 19.1. Formula XIX wherein Ri is methyl; 19.2. Formula XlX or 19.1, wherein G is a single bond or alkylene (e.g., methylene) and J is cycloalkyl or heterocycloalkyl (e.g., oxetan-2-yl, pyrolyin-3-yl, pyrolyin-2-yI) optionally substituted with alkyl (e.g., (1- methylpyrolidin-2-yl);
• R 3 is D-E-F and D is single bond, alkylene (e.g., methylene), or arylalkylene (e.g., -benzylene-);
• R 3 is D-E-F and E is a alkylene (e.g., methylene, ethynylene, prop-2-yn-1-ylene), arylene (e.g., phenylene or -C 6 H 4 -), alkylarylene (e.g., -benzylene- or - CH 2 C 6 H 4 -), aminoalkylene (e.g., -CH 2 N(H)-) or amino (e.g., -N(H)-
• alkylene e.g., methylene, ethynylene, prop-2-yn-1-ylene
• arylene e.g., phenylene or -C 6 H 4 -
• alkylarylene e.g., -benzylene- or - CH 2 C 6 H 4 -
• aminoalkylene e.g., -CH 2 N(H)-
• amino e.g., -N(H)-
• heteroC 3 . 6 cycloa!kyi e.g., pyrolidin-1-yl
• amino e.g., -NH 2
• C 1-4 alkoxy e.g., C 1-4 alkoxy
• -O-haloalkyl e.g., -0-CF 3
• R 3 is a moiety of Formula A wherein R 8 , R9, Ri 1 and Ri 2 are each H and Ri 0 is 2-pyridyl optionally substituted with fluoro (e.g., 6-fluoropyrid-2-yI);
• any one of the preceding formulae wherein the compounds inhibit phosphodiesterase-mediated e.g., PDEl -mediated, especially PDElB- mediated
• hydrolysis of cGMP e.g., with an IC 5 O of less than l ⁇ M, preferably less than 25 nM in an immobilized-metal affinity particle reagent PDE assay, for example, as described in Example 19;
• the PDE 1 Inhibitors for use in the methods of treatment described herein are compounds of Formula XX:
• Ri is H or alkyl (e.g., methyl);
• R 2 is alkyl (e.g., isopropyl, isobutyl, isopropyl, 2,2-dimethylpropyl);
• R 3 is a) D-E-F wherein
• D is single bond, C 1-6 alkylene (e.g., methylene), or arylC
• E is a C 1-6 alkylene (e.g., methylene, ethynylene, prop-2-yn- 1-ylene), arylene (e.g., phenylene or -C 6 H 4 -), C 1- 6 alkylarylene (e.g., -benzylene- Or -CH 2 C 6 H 4 -), aminoC].
• 6alkylene e.g., -CH 2 N(H)-
• amino e.g., -N(H)-
• C 1 -6 alkyl e.g., isobutyl, isopropyl
• aryl e.g., phenyl
• heteroaryl e.g., 1 ,2,4-triazolyl, imidazolyl, pyridyl
• C 1-6 alkyl for example, pyrid-2-yl, imidazol-1-yl, 4-methylimidazolyl, 1- methylimidazol-2-y], 1,2,4-triazol-1-yl, heteroC 3 _ 8
• cycloalkyl e.g., piperidinyl, pyrrolidinyl
• C 1-6 alkyl e.g., methyl
• R 3 is a substituted heteroarylaklyl, e.g., substituted with haloalkyl; or c) R 3 is attached to one of the nitrogen atoms on the pyrazolo portion of Formula XX and is a moiety of Formula A
• X, Y and Z are, independently, N or C, and R 8 , R 9 , Ri 1 and R) 2 are independently H or halogen (e.g., Cl or F); and Rio is halogen, alkyl, cycloalkyl, haloalkyl (e.g., trifluoromethyl), aryl (e.g., phenyl), heteroaryl (e.g., pyridyl, (for example, pyrid-2-yl) or e.g., thiadiazolyl (for example, 1,2,3-thiadiazol- 4-yl), diazolyl, triazolyl (e.g., 1,2,4-triazol-1-yl), tetrazolyl (e.g., tetrazol-5-yl), alkoxadiazoly] (e.g., 5-methyl-1,2,4- oxadiazol), pyrazolyl (e.g., pyrazol-1-yl), alk
• R 4 is aryl (e.g., phenyl) optionally substituted with one or more halo (e.g., F or Cl) or hydroxyl, heteroaryl (e.g., pyrid-4-yl, pyrid-2-yl or pyrazol-3-yl) or heteroC ⁇ cycloalkyl (e.g., pyrrolidin-3-yl); wherein “alk”, “alkyl”, “haloalkyl” or “alkoxy” refers to C, -6 alkyl and "cycloalkyl” refers to C 3-6 cycloalkyl; in free, salt or prodrug form.
• halo e.g., F or Cl
• the Compound of Formula XX includes the proviso that when R 4 is unsubstituted aryl (e.g., phenyl), and R 3 is a moiety of Formula A, wherein Rio is a 5-fluoropyrid-2-yl, 6-fluoropyrid-2-yl, 4,6- dimethylpyrid-2-yl, 3,4-dihydro-2H-pyrol-5-yl, or 1,2,4-triazolyl, [0036]
• the PDE 1 Inhibitors for use in the methods of treatment described herein are compounds of Formula XXI: wherein
• Ri is H or alkyl (e.g., methyl);
• R 2 is alkyl (e.g., isopropyl, isobutyl, isopropyl, 2,2-dimethylpropyl);
• R 3 is a) D-E-F wherein
• D is single bond, alkylene (e.g., methylene) or arylalkylene (e.g., benzylene Or-CH 2 C 6 H 4 -);
• E is a alkylene (e.g., methylene, ethynylene, prop-2-yn-1- ylene), arylene (e.g., phenylene or -C 6 H 4 -), alkylarylene (e.g., -benzylene- Or -CH 2 C 6 H 4 -), aminoalkylene (e.g., - CH 2 N(H)-) or amino (e.g., -N(H)-); and
• alkylene e.g., methylene, ethynylene, prop-2-yn-1- ylene
• arylene e.g., phenylene or -C 6 H 4 -
• alkylarylene e.g., -benzylene- Or -CH 2 C 6 H 4 -
• aminoalkylene e.g., - CH 2 N(H)-
• amino e.g., -N(H)-
• F is alkyl (e.g., isobutyl), aryl (e.g., phenyl), heteroaryl (e.g., pyrid-2-yl, 1,2,4-triazolyl), heteroC 3-6 cycloalkyl (e.g., pyrolidin-1-yl), amino (e.g., -NH 2 ), C 1-4 alkoxy, or - O-haloalkyl (e.g., -0-CF 3 );
• R 3 is a substituted heteroarylaklyl, e.g., substituted with haloalkyl; or c) R 3 is attached to one of the nitrogen atoms on the pyrazolo portion of Formula XXI and is a moiety of Formula A
• Ri 0 is halogen, alkyl, cycloalkyl, haloalkyl (e.g., trifluoromethyl), aryl (e.g., phenyl), heteroaryl (e.g., pyridyl, (for example, pyrid-2-yl) or e.g., thiadiazolyl (for example, 1,2,3-thiadiazol- 4-yl), diazolyl, triazolyl (e.g., 1,2,4-triazol-1-yl), tetrazolyl (e.g., tetrazol-5-yl), alkoxadiazolyl (e.g., 5-methyl- 1,2,4- oxadiazol), pyrazolyl (e.g., pyrazol-1 -y
• R4 is aryl (e.g., phenyl), heteroaryl (e.g., pyrid-4-yl, pyrid-2-yl or pyrazol-3-yl) or heterocycloalkyl (e.g., pyrolidin-3-yl); provided that when R 4 is aryl (e.g., phenyl), and R 3 is a moiety of Formula A, Ri 0 is a 5-fluoropyrid-2-yl, 6-fluoropyrid-2-yl, 4,6-dimethylpyrid-2-yI, 3,4- dihydro-2H-pyrol-5-yl, or 1 ,2,4-triazolyl,
• R 3 is D-E-F and E is alkylene (e.g., methylene or ethynylene), arylene (e.g., phenylene), alkylarylene (e.g., -benzylene-), aminoalkylene (e.g., -CH 2 N(H)-) or amino (e.g., -N(H)-);
• alkylene e.g., methylene or ethynylene
• arylene e.g., phenylene
• alkylarylene e.g., -benzylene-
• aminoalkylene e.g., -CH 2 N(H)-
• amino e.g., -N(H)-
• R 3 is D-E-F and E is alkylene (e.g., methylene or ethynylene);
• R 3 is D-E-F and E is methylene
• R 3 is D-E-F and F is alkyl (e.g., isobutyl), aryl (e.g., phenyl), heteroaryl (e.g., pyrid-2-yl, 1,2,4-triazolyl), heteroC 3 _ 6cycloalkyl (e.g., pyrolidin-1-yl), amine (e.g., -NH 2 ), alkoxy (e.g., methoxy) or -O-haloalkyl (-OCF 3 );
• alkyl e.g., isobutyl
• aryl e.g., phenyl
• heteroaryl e.g., pyrid-2-yl, 1,2,4-triazolyl
• heteroC 3 _ 6cycloalkyl e.g., pyrolidin-1-yl
• amine e.g., -NH 2
• alkoxy e.g., methoxy
• R 3 is D-E-F and F is aryl (e.g., phenyl);
• R 3 is D-E-F and F is phenyl
• R 4 is aryl (e.g., phenyl), heteroaryl (e.g., pyrid-4-yl, pyrid-2-yl or pyrazol- 3-yl) or heterocycloalkyl (e.g., pyrolidin-3-yl); provided that when R 4 is aryl (e.g., phenyl), and R 3 is a moiety of Formula A, Ri 0 is a 5- fluoropyrid-2-yl, 6-fluoropyrid-2-yl, 4,6-dimethylpyrid-2-yl, 3,4- dihydro-2H-pyrol-5-yl, or 1,2,4-triazolyl;
• the invention further provides a Compound of Formula XV, XVI,
• R 2 is C 3- gheterocycloalkyl (e.g., pyrrolidinyl, for example, pyrrolidin-3-yl) optionally substituted with Ci ⁇ alkyl (e.g., methyl), for example,
• R 2 is pyrrolidinyl (e.g., pyrrolidin-3-yl) optionally substituted with C 1-6 alkyl;
• R 4 is aryl (e.g., phenyl) optionally substituted with one or more halo (e.g., F or Cl) or hydroxyl;
• any one of the preceding formulae wherein the compounds inhibit phosphodiesterase-mediated e.g., PDEl -mediated, especially PDEl B -mediated
• hydrolysis of cGMP e.g., with an IC 50 of less than 1 ⁇ M, preferably less than preferably less than 250 nM, preferably less than 50 nM, more preferably less than 25 nM in an immobilized-metal affinity particle reagent PDE assay, for example, as described in Example 1 below, in free, salt or prodrug form.
• the PDE 1 Inhibitors for use in the methods of treatment described herein are a 1,3,5-substituted 6,7-dihydro-lH-pyrazolo[4,3-cQpyrimidin-7- one, of formula VI
• R 3 is methyl or Ci-C 6 alkyl; Ri is ⁇ or Ci-C 4 alkyl;
• each of R 2 and R 3 is independently selected from ⁇ and C 1 -C 4 alkyl, or R 2 is ⁇ or C 1 -C 4 alkyl and R 3 is OH, C 2 -C 4 alkanoyloxy or fluoro, or R 2 and R 3 when taken together represent C 2 -C 6 alkylene, or R 2 and R 3 when taken together with the carbon atom to which they are attached represent a carbonyl group;
• Ar is either (a)
• R 4 , R 5 and R 6 is independently selected from
• R 4 , R 5 and R 6 are independently selected from the R 4 , R5 and R 6 substitutents listed above;
• Z is Ci-C 4 alkylene
• G is a direct link, Z, O, -SO 2 NH-, SO 2 , or -Z-N(C 1 -C 4 alkyl)SO 2 -,
• Het is a 5- or 6-membered heterocyclic group containing 1, 2, 3 or 4 nitrogen heteroatoms; or 1 or 2 nitrogen heteroatoms and 1 sulphur heteroatom or 1 oxygen heteroatom; or the heterocyclic group is furanyl or thiophenyl; wherein the Het group is saturated or partially or fully unsaturated and optionally substituted by up to 3 substitutents, wherein each substitutent is independently selected from Ci -C 4 alkyl, oxo, hydroxy, halo, and 1IaIo(C 1 -C 4 ) alkyl;
• benzodioxolanyl benzodioxanyl, benzimidazolyl, quinolinyl, indolyl, quinazolinyl, isoquinolinyl, benzotriazolyl, benzofuranyl, benzothiophenyl, quinoxalinyl, or phthalizinyl,
• heterocyclic portion of said bicyclic Ar group is optionally partially or fully saturated, said group being optionally substituted by one or more Of C 1 -C 4 alkyl, halo, hydroxy, oxo, amino, and Ci-C 4 alkoxy;
• PDE 1 Inhibitors for use in the present invention include
• Ra is a C 2-4 alkyl group
• R 4 , R 5 and R 6 are independently selected from H , (C 1-4 alkyl) 2 N-, C 1-4 alkanesulphonamido and benzenesulphonamido;
• R 4 , R 5 and R 6 are independently selected from H, diethylamino, methanesulphonamido and benzenesulphonamido;
• a compound which is a 1,3,5,-substituted, 6,7-dihydro-1H- pyrazolo[4,3- ⁇ /]pyrimidin-7-one, in free or pharmaceutically acceptable salt form e.g. a compound of Formula VI or according to any of formulae 3.2 - 3.21 , wherein the compound inhibits phosphodiesterase-mediated (e.g., PDEl -mediated, especially PDElB-mediated) hydrolysis of cGMP, e.g., with an IC 50 of less than l ⁇ M, preferably less than 25 nM in an immobilized-metal affinity particle reagent PDE assay, for example, as described in Example 1 below.
• phosphodiesterase-mediated e.g., PDEl -mediated, especially PDElB-mediated
• the PDE 1 Inhibitors for use in the methods of treatment described herein are substituted (imidazo, pryimido or diazepino)[2,l- b]purin-4-ones of Formula Vila or VIIb:
• R 1 , R a , R b , R c and R d are each independently H, alkyl, aryl, heteroaryl, cycloalkyl or heterocycloalkyl groups,
• each alkyl group of R 1 , R a , R b , R c and R d is independently unsubstituted or substituted with 1 to 5 independently selected R 3 moieties which can be the same or different, each R 3 moiety being independently selected from the group consisting of hydroxy, alkoxy, cycloalkoxy, aryloxy, alkylthio, arylthio, aryl, haloaryl, heteroaryl, cycloalkyl, heterocycloalkyl, amino, alkylamino, dialkylamino, cycloalkylamino and heterocycloalkylamino groups;
• each of the aryl, heteroaryl, cycloalkyl and heterocycloalkyl groups of R 1 , R a , R b , R c and R d is independently unsubstituted or substituted with I to 5 independently selected R 4 moieties which can be the same or different, each R 4 moiety being independently selected from the group consisting of: halo, optionally substituted aryl (e.g., phenyl, chlorophenyl, methoxyphenyl), heteroaryl (e.g., pyridyl, pyrrolyl), nitro, cyano, haloalkyl, haloalkoxy, alkyl, alkoxy, cycloalkyl, heterocycloalkyl (e.g., pyrolidinyl, morpholin-4-yl, pyrrol-1-yl), cycloalkylalkyl, amino, alkylamino, dialkylamino, -OCF 3 , acy
• each of the aryl, heteroaryl, cycloalkyl and heterocycloalkyl groups of the R 3 and R 4 moieties above is independently unsubstituted or substituted with 1 to 5 independently selected R 12 moieties which can be the same or different, each R 12 moiety being independently selected from the group consisting of: halo, phenyl, nitro, cyano, haloalkyl, haloalkoxy, alkyl, cycloalkyl, cycloalkylalkyl, amino, alkylamino, -OCF 3 , acyloxy, - OR 8 , -C(O)R 9 , -C(O)OR 8 , -NR 10 C(O)R 9 , -NR 10 C(O)OR 8 ,- NR 10 S(O) 2 R 9 , - S(O) O-2 R 9 groups, carbonyl when two hydrogens attached to the same carbon atom of the cycloalkyl or heterocyclo groups
• R a and R b together with the carbon to which they are both attached, form a 4- to 7-membered cycloalkyl or heterocycloalkyl ring, and R c and R d are each independently H or an alkyl group; or
• R a and R c together with the respective carbons to which they are attached, form a 4- to 7-membered cycloalkyl or heterocycloalkyl ring, and R b and R d are each independently H or an alkyl group, preferably R a and R c together have the cis configuration, e.g., where the carbons carrying R a and R c have the R and S configurations, respectively;
• R 2 is H, halo, alkyl, hal ⁇ alkyl, alkoxy, alkylthio, amino, aminosulfonyl, monoalkylamino, dialkylamino, hydroxyalkylamino, aminoalkylamino, carboxy, alkoxycarbonyl, aminocarbonyl or alkylaminocarbonyl group,
• each alkyl group of R 2 is independently unsubstituted or substituted with 1 to 5 independently selected R 13 moieties which can be the same or different, each R 13 moiety being independently selected from the group consisting of halo, hydroxy, alkoxy, alkyl, aryl (e.g., phenyl, naphthyl) heteroaryl (e.g., 1H-imidazol-2-yl), cycloalkyl, heterocycloalkyl (e.g., pyrolidin-1-yl), amino, monoalkylamino or dialkylamino group,
• each aryl group of R 13 is independently unsubstituted or substituted with 1 to 5 independently selected R 4 moieties which can be the same or different;
• Y is H or an alkyl group substituted with (i) an aryl, heteroaryl, cycloalkyl, hydroxy, alkoxy, amino, monoalkylamino or dialkylamino group, or (ii) an aryl group substituted with from one to three moieties each independently selected from the group consisting of: halo, alkyl, phenyl, hydroxy, alkoxy, phenoxy, amino, monoalkylamino and dialkylamino group;
• each R 8 is independently H, alkyl or aryl
• each R 9 is independently H, alkyl, aryl or -NR 10 R 11 ;
• each R 10 is independently H, alkyl, aryl, heteroaryl, arylalkyl or heteroarylalkyl, wherein each alkyl, aryl, heteroaryl, arylalkyl or heteroarylalkyl of R 10 is unsubstituted or independently substituted with 1 to 5 R 14 moieties which can be the same or different, each R )4 moiety being independently selected from the group consisting of: halo, alkyl, aryl, cycloalkyl, -CF 3 , -OCF 3 , -CN, -OR 8 , -CH 2 OR 8 , -C(O)OR 8 and - C(O)NR 8 R 8 ; and
• each R 11 is independently H, alkyl, aryl, heteroaryl, arylalkyl or heteroarylalkyl, wherein each alkyl, aryl, heteroaryl, arylalkyl or heteroarylalkyl of R 11 is unsubstituted or independently substituted with 1 to 5 R 14 moieties which can be the same or different.
• the invention further provides the use of PDE 1 Inhibitors of Formula
• 4.16 Of any of the preceding formulae wherein the compound is in free or salt form; 4.17: A compound which is a substituted imidazo[2,l -b]purin-4-one, in free or pharmaceutically acceptable salt form, e.g. a compound of Formula Vila or according to any of formulae 4.1 - 4.16, wherein the compound inhibits phosphodiesterase-mediated (e.g., PDEl -mediated, especially PDElB-mediated) hydrolysis of cGMP, e.g., with an IC 50 of less than i ⁇ M, preferably less than 25 nM in an immobilized-metal affinity particle reagent PDE assay, for example, as described in Example 1 below.
• phosphodiesterase-mediated e.g., PDEl -mediated, especially PDElB-mediated
• compounds of Formula Vila or VIIb are selected from a group consisting of (6aR,9aS)-5,6a,7,8,9,9a-hexahydro-5-methyl-2,3- bis(phenylmethyl)-cyclopent[4,5]imidazo[2,l-b]purin-4(3H)-one, (6aR,9aS)-2- (biphenyl-4-ylmethyl)-5,6a,7,8,9,9a-hexahydro-5-methyl-3- (phenylmethyl)cyclopent[4,5]imidazo[2,l-b]purin-4(3H)-one, 5'-methyI-2',3'- bis(phenylmethyl)spiro[cyclopentane-l,7'(8' ⁇ )-[3 ⁇ ]imidazo[2,l-b]purin]-4'(5' ⁇ )- one and 5 ' -methyl-2 ' -(biphenyl-4-ylmethyl
• compound of Formula Vila is N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoe
• the PDE 1 Inhibitors for use in the methods of treatment described herein are Compounds of Formula Villa or VIIIb:
• R 1 is hydrogen, alkyl or alkyl substituted with aryl or hydroxy
• R 2 is hydrogen, aryl, heteroaryl, cycloalkyl, alkyl or alkyl substituted with aryl, heteroaryl, hydroxy, alkoxy, amino, monoalkyl amino or dialkylamino, or ⁇ (CH 2 ) m TCOR 20 wherein m is an integer from 1 to 6, T is oxygen or -NH- - and R 20 is hydrogen, aryl, heteroaryl, alkyl or alkyl substituted with aryl or heteroaryl;
• R 3 is hydrogen, halo, trifluoromethyl, alkoxy, alkylthio, alkyl, cycloalkyl, aryl, aminosulfonyl, amino, monoalkylamino, dialkylamino, hydroxyalkylamino, aminoalkylamino, carboxy, alkoxycarbonyl or aminocarbonyl or alkyl substituted with aryl, hydroxy, alkoxy, amino, monoalkylamino or dialkylamino;
• R a , R b , R c and R d independently represent hydrogen, alkyl, cycloalkyl or aryl; or (R a and R b ) or (R c and R d ) or (R b and R c ) can complete a saturated ring of 5- to 7-carbon atoms, or (R a and R b ) taken together and (R b and R c ) taken together, each complete a saturated ring of 5- to 7-carbon atoms, wherein each ring optionally can contain a sulfur or oxygen atom and whose carbon atoms may be optionally substituted with one or more or the following: alkenyl, alkynyl, hydroxy, carboxy, alkoxycarbonyl, alkyl or alkyl substituted with hydroxy, carboxy or alkoxycarbonyl; or such saturated ring can have two adjacent carbon atoms which are shared with an adjoining aryl ring; and
• n is zero or one.
• the invention further provides the use of PDE 1 Inhibitors of Formula
• R b form a saturated 5 membered ring
• (R b and R c ) form a saturated 5, 6 or 7 membered ring
• (R a and R b ) and (R b and R c ) each complete a saturated ring and each ring contains 5 or 6 carbon atoms.
• Formula Villa or VIIIb in free or salt form, selected from the following:
• a compound which is a substituted imidazo[2,l-b]purin-4-one, in free or pharmaceutically acceptable salt form e.g. a compound of Formula Villa, VIIIb or according to any of formulae 5.1-5.7, wherein the compound inhibits phosphodiesterase-mediated (e.g., PDEl -mediated, especially PDE IB-mediated) hydrolysis of cGMP, e.g., with an IC 50 of less than 10 ⁇ M, preferably less than 100 nM in an immobilized-metal affinity particle reagent PDE assay, for example, as described in Example 1 below.
• phosphodiesterase-mediated e.g., PDEl -mediated, especially PDE IB-mediated
• the PDE 1 Inhibitors for use in the methods of treatment described herein are Compounds of Formula IXa or IXb
• R 1 is H, cycloalkyl, alkyl, R 23 -alkyl- or R 26 ;
• R a , R b and R c are, independently of one another, each H, alkyl, cyoloalkyl, aryl, R 22 - aryl- or R 24 -alkyI-; or
• R a and R b together with the carbon to which they are both attached, form a 4- to 7- membered ring, and R c is H or alkyl; or
• R a and R c together with the respective carbons to which they are attached, form a 4- to 7-membered ring, and R b is H or alkyl;
• Y is aryl-alkyl or R 22 -aryl-alkyl-;
• R 2 is monohaloalkyl, polyhaloalkyl, provided that it is not trifluoromethyl, azido, cyano, oximino, cycloalkenyl, heteroaryl, R 22 -heteroaryl- or R 27 -alkyl-;
• Y is aryl-alkyl or R 22 -aryl-alkyl-;
• X is — O — or — S — ;
• Y is aryl-alkyl or R 22 -aryl-alkyl-;
• R 2 is R 26 , cycloalkyl cycloalkylalkyl, heterocycloalkyl, cycloalkenyl or R 26 -alkyl-;
• X is — O — or — S — ;
• Y is aryl-alkyl or R 22 -aryl-alkyl-;
• R 2 is alkyl, R 26 , cycloalkyl, cycloalkylalkyl, heterocycloalkyl, cycloalkenyl or R 28 -alkyl-;
• X is —SO— or -SO 2 -;
• Y is aryl-alkyl or R 22 -aryl-alkyl-;
• R 2 is alkyl, R 26 , cycloalkyl, cycloalkylalkyl, heterocycloalkyl, cycloalkenyl or R 28 -alkyl-;
• X is — NR 8 - ;
• Y is aryl-alkyl or R 22 -aryl-alkyl-;
• R 2 is (R 29 ) p -alkyl-, cycloalkyl, (R 30 ) p -cycloalkyl-, cycloalkenyl, (R 30 ) p -cycloalkenyl-, heterocycloalkyl or (R 30 ) p -heterocycloalkyl-:
• Y is aryl-alkyl or R 22 -aryl-alkyI-;
• R 2 is alkyl, R 26 , cycloalkyl, cycloalkylalkyl, heterocycloalkyl, cycloalkenyl or R 3 '-alkyl-; or
• Y is aryl-alkyl or R 22 -aryl-alkyl-;
• R 2 is alkyl, R 26 , cycloalkyl, cycloalkylalkyl or R 23 -alkyl-;
• R 6 is H or R 7 ;
• R 7 is alkyl, cycloalkyl or cycloalkylalkyl
• R 8 is heterocycloalkyl or R 6 ;
• R 21 is 1-6 substituents each independently selected from the group consisting of halo, hydroxy, alkoxy, phenoxy, phenyl, nitro, aminosulfonyl, cyano, monohaloalkyl, polyhaloalkyl, thiol, alkylthio, cyoloalkyl, cycloalkylalkyl, amino, alkylamino, acylamino, carboxyl, — C(O)OR 34 , carboxamido, — OCF 3 and acyloxy;
• R 22 is 1-6 substituents each independently selected from the group consisting of alkyl and R 21 ;
• R 23 is cycloalkoxy aryloxy, alkylthio, arylthio, cycloalkyl or R 28 ;
• R 24 is cycloalkyl or R 26 ;
• R 25 is hydroxy, alkoxy, amino, monoalkylamino, dialkylamino or R 26 ;
• R 26 is aryl, R 22 -aryl-, heteroaryl or R 22 -heteroaryl-;
• R 27 is cycloalkoxy, aryloxy, alkylthio, arylthio, heteroaryl, R 22 -heteroaryl-, cycloalkyl, heterocycloalkyl, cycloalkenyl, cycloalkylamino or heterocycloalkylamino;
• R 28 is cycloalkylamino, heterocycloalkylamino or R 25 ;
• R 29 is alkoxy, cycloalkylamino, heterocycloalkylamino or R 26 ;
• R 30 is halo, hydroxy, alkoxy, amino, aminosulfonyl, cyano, monohaloalkyl, polyhaloalkyl, thiol, alkylthio, alkyl, cyoloalkyl, cycloalkylalkyl or acyloxy;
• R 31 is cycloalkyl or R 28 ;
• R 34 is alkyl, aryl, aralkyl and heteroaryl
• p 1 to 4.
• the invention further provides the use of PDE 1 Inhibitors of Formula
• IXa or IXb as follows:
• the invention provides the use of PDE 1
• Ri, R 2 and R 3 are independently selected from the group consisting of hydrogen, lower alkyl, lower alkoxy, halogeno, hydroxy, (di-lower alkyl)amino, 4-morpholinyl, 1-pyrrolidinyl, 1-pyrrolyl, --CF 3 , — OCF 3 , phenyl and methoxyphenyl; or R 1 and R 2 together are methylenedioxy; or Ri and R 2 together with the carbon atoms to which they are attached form a benzene ring; and
• R a is hydrogen and R b and R c , together with the carbon atoms to which they are attached, form a saturated ring of 5 carbons; or R a is lower alkyl, R b is hydrogen or lower alkyl, and R c is hydrogen; or R a , R b and the carbon atom to which they are attached form a saturated ring of 5-7 carbons, and R c is hydrogen; or R a is hydrogen, and R b , R c and the carbon atoms to which they are attached form a tetrahydrofuran ring; or R a and R b , together with the carbon atom to which they are attached, and R b and R c , together with the carbon atoms to which they are attached, each form a saturated ring of 5-7 carbons.
• the invention provides the use of PDE 1
• R 1 , R 2 and R 3 are independently selected from the group consisting of hydrogen, lower alkyl, lower alkoxy, halogeno, hydroxy, (di-lower alkyl)amino, 4-morpholinyl, 1-pyrrolidinyl, 1- pyrrolyl, -CF 3 , -OCF 3 , phenyl and methoxyphenyl; or Ri and R 2 together are methylenedioxy; or Ri and R 2 together with the carbon atoms to which they are attached form a benzene ring;
• R 2 is selected from a group consisting of H, halo (e.g., F, Cl), methoxy, methyl, trifluoromethyl, dimethylamino, phenyl, methoxyphenyl-, -OCF 3 , 3,4-OCH 2 O-, pyrolidin-1-yl, pyrol-1-yl and morpholin-4-yl;
• R a is hydrogen and R b and R c , together with the carbon atoms to which they are attached, form a saturated ring of 5 carbons; or R a is lower alkyl, R b is hydrogen or lower alkyl, and R c is hydrogen; or R a , R b and the carbon atom to which they are attached form a saturated ring of 5-7 carbons, and R c is hydrogen; or R a is hydrogen, and R b , R c and the carbon atoms to which they are attached form a tetrahydrofuran ring; or R a and R b , together with the carbon atom to which they are attached, and R b and R c , together with the carbon atoms to which they are attached, each form a saturated ring of 5-7 carbons;
• the invention provides the use of PDE 1
• Inhibitors selected from the following:
• Alkyl as used herein is a saturated or unsaturated hydrocarbon moiety, preferably saturated, preferably one to seven carbon atoms in length, which may be linear or branched, and may be optionally substituted, e.g., mono-, di-, or tri- substituted, e.g., with halogen (e.g., chloro or fluoro), hydroxy, or carboxy.
• halogen e.g., chloro or fluoro
• Cycloalkyl as used herein is a saturated or unsaturated nonaromatic hydrocarbon moiety, preferably saturated, preferably comprising three to nine carbon atoms, at least some of which form a nonaromatic mono- or bicyclic, or bridged cyclic structure, and which may be optionally substituted, e.g., with halogen (e.g., chloro or fluoro), hydroxy, or carboxy. c.
• halogen e.g., chloro or fluoro
• Heterocycloalkyl as used herein is a saturated or unsaturated nonaromatic hydrocarbon moiety, preferably saturated, preferably comprising three to nine carbon atoms, at least one atom selected from a group consisting of N, O or S, at least some of which form a nonaromatic mono- or bicyclic, or bridged cyclic structure, and which may be optionally , substituted, e.g., with halogen (e.g., chloro or fluoro), hydroxy, or carboxy.
• halogen e.g., chloro or fluoro
• heterocycloalkyl examples include pyrrolidinyl (e.g., pyrroUdm ' -l-yl), morpholinyi (e.g., morpholin-4-yl), d.
• Aryl as used herein is a mono or bicyclic aromatic hydrocarbon (e.g., phenyl, naphthyl), preferably phenyl, optionally substituted, e.g., with alkyl (e.g., methyl), halogen (e.g., chloro or fluoro), haloalkyl (e.g., trifluoromethyl), hydroxy, carboxy, or an additional aryl or heteroaryl (e.g., biphenyl or pyridylphenyl).
• Heteroaryl as used herein is an aromatic moiety wherein one or more of the atoms making up the aromatic ring is sulfur or nitrogen rather than carbon, e.g., pyridyl, thiadiazolyl, pyrrolyl (e.g., pyrrol-2-yl) or imidazolyl (e.g., 1H-imidazol-2-yl), which may be optionally substituted, e.g., with alkyl, halogen, haloalkyl, hydroxy or carboxy.
• PDE 1 Inhibitors may exist in free or salt form, e.g., as acid addition salts.
• PDE 1 Inhibitors may exist in free or salt form, e.g., as acid addition salts.
• acid addition salts e.g., as acid addition salts.
• the PDE 1 Inhibitors are intended for use as pharmaceuticals, therefore pharmaceutically acceptable salts are preferred. Salts which are unsuitable for pharmaceutical uses may be useful, for example, for the isolation or purification of free PDE 1 Inhibitors or their pharmaceutically acceptable salts.
• PDE 1 Inhibitors may in some cases also exist in prodrug form, for example when the compounds contain physiologically hydrolysable and acceptable esters.
• physiologically hydrolysable and acceptable ester means esters of PDE 1 Inhibitors which are hydrolysable under physiological conditions to yield acids (in the case of PDE 1 Inhibitors which have hydroxy substituents) or alcohols (in the case of PDE 1 Inhibitors which have carboxy substituents) which are themselves physiologically tolerable at doses to be administered.
• physiologically hydrolysable and acceptable ester means esters of PDE 1 Inhibitors which are hydrolysable under physiological conditions to yield acids (in the case of PDE 1 Inhibitors which have hydroxy substituents) or alcohols (in the case of PDE 1 Inhibitors which have carboxy substituents) which are themselves physiologically tolerable at doses to be administered.
• the term thus embraces conventional pharmaceutical prodrug forms.
• the invention provides methods of treatment of psychosis, e.g., any condition characterized by psychotic symptoms such as hallucinations, paranoid or playful delusions, or disorganized speech and thinking, e.g., schizophrenia, schizoaffective disorder, schizophreniform disorder, psychotic disorder, delusional disorder, or mania, such as in acute manic episodes and bipolar disorder, comprising administering an effective amount of a PDE 1 inhibitor, e.g., a PDE 1 Inhibitor as hereinbefore described, for example a Compound of any of Formulae I, Ia, II, III, IV, V, VI, Vila, VIIb, Villa, VIIIb, IXa, IXb, X, XI.
• a PDE 1 inhibitor e.g., a PDE 1 Inhibitor as hereinbefore described, for example a Compound of any of Formulae I, Ia, II, III, IV, V, VI, Vila, VIIb, Villa, VIIIb, IX
• PDE 1 Inhibitors may be used in the foregoing methods of treatment prophylaxis as a sole therapeutic agent, but may also be used in combination or for co-administration with other active agents.
• the invention further comprises a method of treating psychosis, e.g., schizophrenia, schizoaffective disorder, schizophreniform disorder, psychotic disorder, delusional disorder, or mania, comprising administering simultaneously, sequentially, or contemporaneously administering therapeutically effective amounts of
• psychosis e.g., schizophrenia, schizoaffective disorder, schizophreniform disorder, psychotic disorder, delusional disorder, or mania
• a PDE 1 Inhibitor e.g., any of Formulae I, Ia, II, III, IV, V, VI, Vila, VIIb, Villa, VIIIb, IXa, IXb, X, XI, XII-XXI, or any of Formulae 1.2-1.17, 2.1-2.9, 3.2-3.22, 4.1-4.17, 5.1-5.8, 6.1-6.2, 7.1-7.12, 15.1-15.95, 17.1-17.39, 19.1- 19.39, 21.1 -21.44 or 22.1-22.24; and (ii) an antipsychotic, e.g.,
• Typical antipsychotics e.g.,
• Butyrophenones e.g. Haloperidol (Haldol, Serenace), Droperidol (Droleptan);
• Phenothiazines e.g., Chlorpromazine (Thorazine, Largactil), Fluphenazine (Prolixin), Perphenazine (Trilafon), Prochlorperazine (Compazine), Thioridazine (Mellaril, Melleril), Trifluoperazine (Stelazine), Mesoridazine, Periciazine, Promazine, Triflupromazine (Vesprin),
• Thioxanthenes e.g., Chlorprothixene, Flupenthixol (Depixol,
• Atypical antipsychotics e.g.,
• Clozapine Clozapine (Clozaril), Olanzapine (Zyprexa), Risperidone (Risperdal), Quetiapine (Seroquel), Ziprasidone (Geodon), Amisulpride (Solian), Paliperidone (Invega), Aripiprazole (Abilify), Bifeprunox; norclozapine,
• the present invention also provides
• a pharmaceutical composition comprising a PDE 1 Inhibitor in combination or association with a pharmaceutically acceptable diluent or carrier for use in the treatment of a disease or condition as hereinbefore set forth, or for use in a method of treatment as hereinbefore set forth.
• treatment and “treating” are to be understood accordingly as embracing prophylaxis and treatment or amelioration of any of the symptoms of disease as well as treatment of the cause of the disease.
• Dosages employed in practicing the present invention will of course vary depending, e.g. on the particular disease or condition to be treated, the particular PDE 1 Inhibitor used, the mode of administration, and the therapy desired.
• PDE 1 Inhibitors may be administered by any suitable route, including orally, parenterally, transdermally, or by inhalation, but are preferably administered orally.
• satisfactory results, e.g. for the treatment of diseases as hereinbefore set forth are indicated to be obtained on oral administration at dosages of the order from about 0.01 to 2.0 mg/kg.
• an indicated daily dosage for oral administration will accordingly be in the range of from about 0.75 to 150 mg, conveniently administered once, or in divided doses 2 to 4 times, daily or in sustained release form.
• Unit dosage forms for oral administration thus for example may comprise from about 0.2 to 75 or 150 mg, e.g. from about 0.2 or 2.0 to 50, 75 or 100 mg of a PDE 1 Inhibitor, together with a pharmaceutically acceptable diluent or carrier therefor.
• compositions comprising PDE 1 Inhibitors may be prepared using conventional diluents or excipients and techniques known in the galenic art.
• oral dosage forms may include tablets, capsules, solutions, suspensions and the like.
• Phosphodiesterase IB is a calcium/calmodulin dependent phosphodiesterase enzyme that converts cyclic guanosine monophosphate (cGMP) to 5'-guanosine monophosphate (5'-GMP).
• PDElB can also convert a modified cGMP substrate, such as the fluorescent molecule cGMP-fluorescein, to the corresponding GMP-fluorescein.
• the generation of GMP -fluorescein from cGMP-fluorescein can be quantitated, using, for example, the IMAP (Molecular Devices, Sunnyvale, CA) immobilized-metal affinity particle reagent.
• the IMAP reagent binds with high affinity to the free 5'- phosphate that is found in GMP-fluorescein and not in cGMP-fluorescein.
• the resulting GMP-fluorescein - IMAP complex is large relative to cGMP-fluorescein.
• Small fluorophores that are bound up in a large, slowly tumbling, complex can be distinguished from unbound fluorophores, because the photons emitted as they fluoresce retain the same polarity as the photons used to excite the fluorescence.
• Assay 3',5'-cyclic-nucleotide-specific bovine brain phosphodiesterase (Sigma, St. Louis, MO) is reconstituted with 50% glycerol to 2.5 U/ml. One unit of enzyme will hydrolyze 1.0 ⁇ mole of 3',5'-cAMP to 5'-AMP per min at pH 7.5 at 30°C.
• reaction buffer (30 ⁇ M CaCl 2 , 10 U/ml of calmodulin (Sigma P2277), 1OmM Tris-HCl pH 7.2, 1OmM MgCl 2 , 0.1% BSA, 0.05% NaN 3 ) to yield a final concentration of 1.25mU/ml.
• 99 ⁇ l of diluted enzyme solution is added into each well in a flat bottom 96-well polystyrene plate to which 1 ⁇ l of test compound dissolved in 100% DMSO is added. The compounds are mixed and pre-incubated with the enzyme for 10 min at room temperature.
• the FL-GMP conversion reaction is initiated by combining 4 parts enzyme and inhibitor mix with 1 part substrate solution (0.225 ⁇ M) in a 384-well microtiter plate. The reaction is incubated in dark at room temperature for 15 min. The reaction is halted by addition of 60 ⁇ l of binding reagent (1 :400 dilution of IMAP beads in binding buffer supplemented with 1 :1800 dilution of antifoam) to each well of the 384-well plate. The plate is incubated at room temperature for 1 hour to allow IMAP binding to proceed to completion, and then placed in an Envision multimode microplate reader (PerkinElmer, Shelton, CT) to measure the fluorescence polarization ( ⁇ mp).
• Envision multimode microplate reader PerkinElmer, Shelton, CT
• IC 50 values are determined by measuring enzyme activity in the presence of 8 to 16 concentrations of compound ranging from 0.0037 nM to 80,000 nM and then plotting drug concentration versus ⁇ mP, which allows IC 50 values to be estimated using nonlinear regression software (XLFit; IDBS, Cambridge, MA).

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