US20110124678A1 - Treatment with alpha 7-selective ligands - Google Patents

Treatment with alpha 7-selective ligands Download PDF

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US20110124678A1
US20110124678A1 US12/674,327 US67432708A US2011124678A1 US 20110124678 A1 US20110124678 A1 US 20110124678A1 US 67432708 A US67432708 A US 67432708A US 2011124678 A1 US2011124678 A1 US 2011124678A1
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azabicyclo
pyridinyl
methyl
oct
mice
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Merouane Bencherif
Mario B. Marrero
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Catalyst Biosciences Inc
Augusta University Research Institute Inc
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Targacept Inc
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Definitions

  • the present invention includes methods, uses, and selective ⁇ 7 nAChR agonist compounds for treating or preventing metabolic disorders.
  • Metabolic syndrome is a combination of medical disorders that increase the risk for cardiovascular disease and diabetes. Metabolic syndrome affects as much as 25% of the US population and is known by various other names such as (metabolic) syndrome X, insulin resistance syndrome, or Reaven's syndrome.
  • a patient diagnosed with metabolic syndrome typical exhibits three or more symptoms selected from the following group of five symptoms: (1) abdominal obesity; (2) hypertriglyceridemia; (3) low high-density lipoprotein cholesterol (low HDL); (4) high blood pressure; and (5) elevated fasting glucose, which may be in the range characteristic of Type 2 diabetes.
  • Symptoms and features include diabetes mellitus type 2, insulin resistance, high blood pressure, fat deposits mainly around the waist, decreased HDL, elevated triglycerides, and elevated uric acid levels.
  • Primary clinical problems are obesity and the high incidence of diabetes, a condition secondary to the insulin resistant state caused by excess adiposity.
  • Insulin resistance in skeletal muscle, liver and adipose tissue impedes glucose disposal and results in the release of free fatty acids and the characteristic triglyceride dyslipidemia associated with the metabolic syndrome. Elevations in post-prandial and ultimately fasting glucose levels result in compensatory hyperinsulinemia, a condition which causes ⁇ -cell hypertrophy and eventual failure of the Islets and frank type 2 diabetes.
  • Different quantitative inclusion criteria for metabolic syndrome have been proposed by the National Diabetes Federation, the World Health Organization, the European Group for the Study of Insulin Resistance (1999) and the National Cholesterol Education Program Adult Treatment Panel III (2001).
  • Patients with metabolic syndrome, whether or not they have or develop overt diabetes mellitus have an increased risk of developing the macrovascular and microvascular complications that occur with type 2 diabetics, such as atherosclerosis and coronary heart disease.
  • statins otherwise referred to as 3-hydroxy-3-methylglutaryl-coenzyme A (HMG-CoA) reductase inhibitors, are potent inhibitors of cholesterol synthesis that are extensively used in the treatment of hypercholesterolemia.
  • HMG-CoA 3-hydroxy-3-methylglutaryl-coenzyme A
  • 3- Hydroxy -3- methylglutaryl CoA reductase inhibitors prevent high glucose - induced proliferation of mesangial cells via modulation of Rho GTPase/p 21 signaling pathway: Implications for diabetic nephropathy , Proc Natl Acad Sci USA 99: 8301-8305, 2002; de Fiebre C M, Meyer E M, Henry J C, Muraskin S I, Kem W R and Papke R L. Characterization of a series of anabaseine - derived compounds reveals that the 3-(4)- dimethylaminocinnamylidine derivative is a selective agonist at neuronal nicotinic ⁇ 7/125l- ⁇ - bungarotoxin receptor subtypes , Mol. Pharmacol.
  • Nicotinic acetylcholine receptor ⁇ 7 subunit is an essential regulator of inflammation , Nature, 421, 384-387 (2003); de Jonge, W. J. & Ulloa, L., The alpha 7 nicotinic acetylcholine receptor as a pharmacological target for inflammation , British J. Pharmacol., 151, 915-929 (2007); Formari, A. et al., Nicotine withdrawal increases body weight, neuropeptide Y and Agouti - related protein expression in the hypothalamus and decreases uncoupling protein- 3 expression in the brown adipose tissue in high - fat fed mice , Neurosci.
  • Protein - tyrosine phosphatase 1 B is a negative regulator of Insulin - and Insulin - like Growth Factor -1- stimulated signaling , J. Biol. Chem. 271, 19810-19816 (1996); Klaman, L. D. et al., Increased energy expenditure, decreased adiposity, and tissue - specific insulin sensitivity in Protein - tyrosine Phosphatase 1 B - deficient mice , Mol. Cell.
  • TYK 2 and JAK 2 are substrates of Protein - tyrosine Phosphatase 1 B , J. Biol. Chem., 276, 47771-47774 (2001); and Bence, K. K. et al., Neuronal PTP 1 B regulates body weight, adiposity and leptin action , Nat. Med., 12, 917-24 (2006).
  • One aspect of the present invention includes a method for treating or preventing metabolic disorders comprising the administration of a selective ⁇ 7 nAChR agonist.
  • Another aspect of the present invention includes a method for treating or preventing drug-induced central nervous system disorders comprising the administration of a selective ⁇ 7 nAChR agonist.
  • the ⁇ 7 nAChR agonist is Compound A, Compound B, or Compound C, or a pharmaceutically acceptable salt thereof. In one embodiment, the ⁇ 7 nAChR agonist is Compound C or a pharmaceutically acceptable salt thereof.
  • the metabolic disorder is one or more of type I diabetes mellitus, type II diabetes mellitus, metabolic syndrome, atherosclerosis, obesity, and hyperglycemia.
  • the hyperglycemia is a result of statin therapy.
  • the drug-induced central nervous system disorder is a result of statin therapy.
  • One aspect of the present invention is a method for treating or preventing a metabolic disorder comprising the administration of
  • the metabolic disorder is one or more of type I diabetes mellitus, type II diabetes mellitus, metabolic syndrome, atherosclerosis, obesity, and hyperglycemia.
  • a daily dose is from about 0.001 mg/kg to about 3.0 mg/kg.
  • One aspect of the present invention is use of a selective ⁇ 7 nAChR agonist in the manufacture of a medicament for treating or preventing metabolic disorders.
  • Another aspect is use of a selective ⁇ 7 nAChR agonist in the manufacture of a medicament for treating or preventing drug-induced central nervous system disorders.
  • the ⁇ 7 nAChR agonist is Compound A, Compound B, or Compound C, or a pharmaceutically acceptable salt thereof. In one embodiment, the ⁇ 7 nAChR agonist is Compound C or a pharmaceutically acceptable salt thereof.
  • the metabolic disorder is one or more of type I diabetes mellitus, type II diabetes mellitus, metabolic syndrome, atherosclerosis, obesity, and hyperglycemia.
  • the hyperglycemia is a result of statin therapy.
  • the drug-induced central nervous system disorder is a result of statin therapy.
  • the metabolic disorder is one or more of type I diabetes mellitus, type II diabetes mellitus, metabolic syndrome, atherosclerosis, obesity, and hyperglycemia.
  • a daily dose is from about 0.001 mg/kg to about 3.0 mg/kg.
  • Another aspect of the present invention is a selective ⁇ 7 nAChR agonist compound for use in treating or preventing metabolic disorders.
  • Another aspect of the present invention is a selective ⁇ 7 nAChR agonist compound for use in treating or preventing drug-induced central nervous system disorders.
  • the ⁇ 7 nAChR agonist is Compound A, Compound B, or Compound C, or a pharmaceutically acceptable salt thereof. In one embodiment, the ⁇ 7 nAChR agonist is Compound C or a pharmaceutically acceptable salt thereof.
  • the metabolic disorder is one or more of type I diabetes mellitus, type II diabetes mellitus, metabolic syndrome, atherosclerosis, obesity, and hyperglycemia.
  • the hyperglycemia is a result of statin therapy.
  • the drug-induced central nervous system disorder is a result of statin therapy.
  • Another aspect of the present invention is a selective ⁇ 7 nAChR agonist compound
  • the metabolic disorder is one or more of type I diabetes mellitus, type II diabetes mellitus, metabolic syndrome, atherosclerosis, obesity, and hyperglycemia.
  • a daily dose is from about 0.001 mg/kg to about 3.0 mg/kg.
  • FIG. 1 is a graphic representation showing the effects of Compound A on body weight in obese db/db mice.
  • FIG. 2 is a graphic representation showing the effects of Compound A on plasma glucose in obese db/db mice.
  • FIG. 3 is a graphic representation showing the effects of Compound A on food consumption in obese db/db mice.
  • FIG. 4 is a graphic representation showing the effects of Compound A on body weight in obese db/db mice.
  • FIG. 5 is a graphic representation showing the effects of Compound A on glucose levels in obese db/db mice.
  • FIG. 6 is a graphic representation showing the partial inhibition of the effects of Compound A on food consumption in obese db/db mice of the JAK2 tyrosine phosphorylation inhibitor AG-490.
  • AG-490 a known inhibitor of JAK2 tyrosine phosphorylation, partially inhibits effects of Compound A.
  • FIGS. 7A and 7B are graphic representations showing the effects of JAK2 loss-of-function on multiple low dose (MLDS) STZ-induced diabetes (Fasting Blood Glucose) in mice in the presence or absence of Compound A.
  • MLDS multiple low dose
  • STZ-induced diabetes Frasting Blood Glucose
  • FIGS. 8A and 8B are graphic representations showing the effects of JAK2 loss-of-function on multiple low dose (MLDS) STZ-induced increase in HbA1c in mice in the presence or absence of Compound A.
  • MLDS multiple low dose
  • FIGS. 9A and 9B are graphic representations showing the effects of JAK2 loss-of-function on multiple low dose (MLDS) STZ-induced decrease in plasma insulin in mice in the presence or absence of Compound A.
  • MLDS multiple low dose
  • FIGS. 10A and 10B are graphic representations showing the effects of JAK2 loss-of-function on multiple low dose (MLDS) STZ-induced increase in plasma TNF ⁇ in mice in the presence or absence of Compound A.
  • MLDS multiple low dose
  • FIG. 11 is a graphic representation showing the effects of Compound B on food consumption in db/db mice. Results represent the mean+/ ⁇ SEM of eight treated mice and are expressed as food consumed in grams/day. Fat mice show a significant increase in food consumption (*P ⁇ 0.01) which was significantly inhibited by Compound B treatment (+P ⁇ 0.01).
  • FIG. 12 is a graphic representation showing the effects of Compound B on body mass in db/db mice. Results represent the mean+/ ⁇ SEM of eight treated mice and are expressed as their body mass in grams. Fat mice show a significant increase in body mass (*P ⁇ 0.01) which was significantly inhibited by Compound B (+P ⁇ 0.01).
  • FIG. 13 is a graphic representation showing the effects of Compound B on plasma blood glucose (BG) in db/db mice. Results represent the mean+/ ⁇ SEM of eight treated mice and are expressed as mg/dL. Fat mice show a significant increase in BG (*P ⁇ 0.01) which was significantly inhibited by Compound B treatment (+P ⁇ 0.01).
  • FIG. 14 is a graphic representation showing the effects of Compound B on plasma triglycerides (TG) in db/db mice. Results represent the mean+/ ⁇ SEM of eight treated mice and are expressed as mg/dL. Fat mice show a significant increase in plasma TG (*P ⁇ 0.01) which was significantly inhibited by Compound B treatment (+P ⁇ 0.01).
  • FIG. 15 is a graphic representation showing the effects of Compound B on plasma glycosylated hemoglobin (Hb1ac) in db/db mice. Results represent the mean+/ ⁇ SEM of five treated mice and are expressed as %. Fat mice show a significant increase in plasma HbA1c (*P ⁇ 0.01) which was significantly inhibited by Compound B treatment (+P ⁇ 0.01).
  • FIG. 16 is a graphic representation showing the effects of Compound B on plasma TNF ⁇ in db/db mice. Results represent the mean+/ ⁇ SEM of five treated mice and are expressed as pg/ml. Fat mice show a significant increase in TNF ⁇ (*P ⁇ 0.01) which was significantly inhibited by Compound B treatment (+P ⁇ 0.01).
  • FIG. 17 is a graphic representation showing the effects of Compound B on the Glucose Tolerance Test (GTT) in db/db mice PTP-1B WT mice. Results represent the mean+/ ⁇ SEM of four treated mice and are expressed as mg/dL. Fat mice show a significant increase in glucose levels(*P ⁇ 0.01) and a significant effect with Compound B treatment (+P ⁇ 0.01).
  • FIG. 18 is a graphic representation of the effects of simvastatin, referred generally as “statin,” and Compound A on body mass in db/db mice. Results represent the mean+/ ⁇ SEM of eight treated mice and are expressed as their body mass in grams. Fat mice show a significant increase in body mass (*P ⁇ 0.01) which was significantly inhibited by Compound A (+P ⁇ 0.01). Simvastatin alone did not significantly inhibit the increase in body mass (#P>0.05). However, the combination of simvastatin and Compound A had a significant effect in lowering the body mass compared to simvastatin alone (**P ⁇ 0.01).
  • FIG. 19 is a graphic representation of the effects of simvastatin, referred generally as “statin,” and Compound A on food consumption in db/db mice.
  • Results represent the mean+/ ⁇ SEM of eight treated mice and are expressed as food consumed in grams/day.
  • Fat mice show a significant increase in food consumption (*P ⁇ 0.01) which was significantly inhibited by Compound A (+P ⁇ 0.01).
  • Simvastatin alone did not significantly inhibited the increased in food consumption (#P>0.05).
  • the combination of simvastatin and Compound A had a significant effect (**P ⁇ 0.01).
  • FIG. 20 is a graphic representation of the effects of simvastatin, referred generally as “statin,” and Compound A on Hb1ac in db/db mice.
  • Results represent the mean+/ ⁇ SEM of eight treated mice and are expressed as % glycated hemoglobin (% Hb1 ac).
  • Fat mice show a significant increase in % Hb1 ac (*P ⁇ 0.01) which was significantly inhibited by Compound A (+P ⁇ 0.01).
  • Simvastatin alone did not lower the levels % Hb1ac.
  • the combination of simvastatin and Compound A significantly decreased the levels of % Hb1 ac when compared to both the fat (**P ⁇ 0.01) and the fat plus simvastatin (#P ⁇ 0.01).
  • FIG. 21 is a graphic representation of the effects of simvastatin, referred generally as “statin,” and Compound A on plasma blood glucose (BG) in db/db mice.
  • Results represent the mean+/ ⁇ SEM of eight treated mice and are expressed as mg/dL.
  • Fat mice show a significant increase in BG (*P ⁇ 0.01) which was significantly inhibited by Compound A (+P ⁇ 0.01).
  • Simvastatin alone significantly increased the levels of BG (++P ⁇ 0.01) above the fat mice treated with vehicle alone.
  • the combination of simvastatin and Compound A significantly decreased the levels of BG when compared to both the fat (**P ⁇ 0.01) and the fat plus simvastatin (#P ⁇ 0.01).
  • FIGS. 22A and 22B are graphic representations of the effects of simvastatin, referred generally as “statin,” and Compound A on insulin resistance glucose tolerance test in db/db mice.
  • FIG. 23 is a graphic representation of the effects of simvastatin, referred generally as “statin,” and Compound A on plasma triglycerides (TG) in db/db mice.
  • Results represent the mean+/ ⁇ SEM of eight treated mice and are expressed as mg/dL.
  • Fat mice show a significant increase in TG (*P ⁇ 0.01) which was significantly inhibited by Compound A (+P ⁇ 0.01).
  • Simvastatin alone did not significantly decreased the levels of TG (++P>0.01) above the fat mice treated with vehicle alone.
  • the combination of simvastatin and Compound A significantly decreased the levels of TG when compared to both the fat and the fat (**P ⁇ 0.01) and the fat plus simvastatin (#P ⁇ 0.01).
  • FIG. 24 is a graphic representation of the effects of simvastatin, referred generally as “statin,” and Compound A on plasma cholesterol (Chol) in db/db mice.
  • Results represent the mean+/ ⁇ SEM of eight treated mice and are expressed as mg/dL.
  • Fat mice show a significant increase in Chol (*P ⁇ 0.01) which was significantly inhibited by Compound A (+P ⁇ 0.01).
  • Simvastatin alone also significantly decreased the levels of Chol (++P>0.01) above the fat mice treated with vehicle alone.
  • the combination of simvastatin and Compound A also significantly decreased the levels of Chol when compared to the fat (**P ⁇ 0.01). However, there was no significant difference between the Compound A plus simvastatin and the simvastatin alone (#P>0.05).
  • FIG. 25 is a graphic representation of the effects of simvastatin, referred generally as “statin,” and Compound A on plasma TNF ⁇ in db/db mice.
  • Results represent the mean+/ ⁇ SEM of eight treated mice and are expressed as pg/ml.
  • Fat mice show a significant increase in TNF ⁇ (*P ⁇ 0.01) which was significantly inhibited by Compound A (+P ⁇ 0.01).
  • Simvastatin alone did not significantly inhibit the increased in TNF ⁇ (#P>0.05).
  • the combination of simvastatin and Compound A had a significant effect in lowering the levels of TNFa (**P ⁇ 0.01).
  • FIG. 26A is an illustration of the identification of hippocampal progenitor cells using flow cytometry.
  • FIG. 26B is a graphic representation of the effect of anti-depressants on hippocampal progenitor proliferation in mice.
  • FIG. 27 is a graphic representation of the effect of Compound A on hippocampal progenitor cell proliferation.
  • FIG. 28 is a graphic representation illustrating a microglial cell proliferation assay.
  • P FIG. 29 is a graphic representation of the effects of nicotine, Compound D, Compound E, and Compound A on microglial cell proliferation in an LPS-induced model of neuroinflammation.
  • FIG. 30 is a is a Western blot showing the effects of simvastatin on the nicotine-induced JAK2 activation in PC12 cells.
  • Cells were pretreated with simvastatin (5 uM) for 24 hours and with nicotine at the time indicated.
  • the methods for blotting are as described (see, Shaw S. et al, J. Biol. Chem., 2002, herein incorporated by reference). Pretreatment of cells with simvastatin significantly inhibited JAK2 activation induced by nicotine for the times indicated.
  • FIG. 31 is a Western blot showing the effects of simvastatin on the nicotine-induced neuroprotection against A ⁇ -induced apoptosis in PC12 cells. The methods are as described.
  • Poly-(ADP-ribose) polymerase (PARP) is marker of cells undergoing apoptosis. PARP expression was determined by Western analysis of PC12 cells nuclear extract.
  • FIG. 32 is a Western blot showing the effects of 10 ⁇ M farnesyl pyrophosphate (FPP) and geranylgeranyl pyrophosphate (GGPP) on the simvastatin-induced apoptosis in PC12 cells. The methods are as described.
  • FPP farnesyl pyrophosphate
  • GGPP geranylgeranyl pyrophosphate
  • FIG. 33 is graphic representation showing the effects of 10 ⁇ M farnesyl pyrophosphate (FPP) and geranylgeranyl pyrophosphate (GGPP) on the simvastatin blockade of nicotine-induced ROS production in PC12 cells.
  • FPP farnesyl pyrophosphate
  • GGPP geranylgeranyl pyrophosphate
  • FIG. 34 is a graphic representation of the effects of Compound C on food consumption in db/db mice.
  • the illustrated results represent the mean ⁇ SEM of five treated mice/group and are expressed as food consumed in grams/day.
  • Fat mice show a significant increase in food consumption above lean mice (*P ⁇ 0.01) which was significantly inhibited by Compound C treatment (+P ⁇ 0.01).
  • FIG. 35 is a graphic representation of the effects of Compound C on body mass in db/db mice.
  • the illustrated results represent the mean ⁇ SEM of five treated mice/group and are expressed as body mass in grams. Fat mice show a significant increase in body mass (*P ⁇ 0.01) which was significantly inhibited by Compound C treatment (+P ⁇ 0.01). There is no significant difference between fat wild type and fat PTP-1B KO mice due to Compound C treatment (#P>0.05).
  • FIG. 36 is a graphic representation of the effects of Compound C on plasma blood glucose (BG) in db/db mice.
  • the illustrated results represent the mean ⁇ SEM of five treated mice/group and are expressed as mg/dL of BG.
  • Fat mice show a significant increase in BG (*P ⁇ 0.01) which was significantly inhibited by Compound C treatment (+P ⁇ 0.01).
  • FIG. 37 is a graphic representation of the effects of Compound C on plasma triglycerides in db/db mice.
  • the illustrated results represent the mean ⁇ SEM of five treated mice/group and are expressed as mg/dL.
  • Fat mice show a significant increase in plasma TG (*P ⁇ 0.01) which was significantly inhibited by Compound C treatment (+P ⁇ 0.01) in the fat PTP-1B wild type but not in the fat PTP-1B KO. There is also a significant difference in plasma TG levels between the treated fat wild type and treated fat PTP-1B KO (#P ⁇ 0.01).
  • FIG. 38 is a graphic representation of the effects of Compound C on plasma glycosylated hemoglobin (Hb1ac) in db/db mice.
  • the illustrated results represent the mean ⁇ SEM of five treated mice/group and are expressed as %.
  • Fat mice show a significant increase in plasma Hb1ac (*P ⁇ 0.01) which was significantly inhibited by Compound C treatment (+P ⁇ 0.01).
  • FIG. 39 is a graphic representation of the effects of Compound C on TNF ⁇ in db/db mice.
  • the illustrated results represent the mean ⁇ SEM of five treated mice/group and are expressed as pg/mL.
  • Fat mice show a significant increase in TNF ⁇ (*P ⁇ 0.01) which was significantly inhibited by Compound C treatment (+P ⁇ 0.01).
  • TNF ⁇ plasma levels between the fat wild type and fat PTP-1B KO (#P ⁇ 0.01).
  • FIG. 40 is a graphic representation of the effects of Compound C in the glucose tolerance test (GTT) in db/db mice PTP-1B wild type mice. The illustrated results represent the mean ⁇ SEM of four treated mice/group and are expressed as mg/dL. Fat mice show a significant decrease in glucose deposition (*P ⁇ 0.01) with Compound C treatment. Fat mice show a significant increase in deposition (+P ⁇ 0.01).
  • One aspect of the present invention includes the role of ⁇ 7 nAChRs in regulating key biological pathways involved in the metabolic syndrome and the potential of selective ⁇ 7 nAChR agonists as a novel therapeutic approach to treat this condition.
  • ⁇ 7 has been implicated in the cholinergic inflammatory pathway, the evidence is based exclusively on the use of non-selective agonists in the presence of putative selective antagonists, some with rather poor pharmacokinetics or brain penetration properties.
  • another aspect of the present invention includes compounds (hereinafter defined and referred to as Compounds A, B, or C) with high selectivity for the ⁇ 7 nAChR.
  • Compound A is (5-methyl-N-[(2S,3R)-2-(pyridin-3-ylmethyl)-1-azabicyclo[2.2.2]oct-3-yl]thiophene-2-carboxamide), illustrated below.
  • Compound A may also be referred to as (2S,3R)—N-(2-((3-pyridinyl)methyl)-1-azabicyclo[2.2.2]octan-3-yl)-5-methylthiophene-2-carboxamide. Such naming conventions should not impact the clarity of the present invention.
  • Compound B is (2S,3R)—N-(2-((3-pyridinyl)methyl)-1-azabicyclo[2.2.2]oct-3-yl)-5-(2-pyridinyl)thiophene-2-carboxamide, illustrated below:
  • Compound C is (2S,3R)—N-(2-((3-pyridinyl)methyl)-1-azabicyclo[2.2.2]oct-3-yl)benzofuran-2-carboxamide, illustrated below:
  • ⁇ 7-selective ligands inhibit the metabolic syndrome observed in db/db mice by reducing weight gain, normalizing glucose levels, increasing insulin secretion, decreasing glycated hemoglobin, reducing pro-inflammatory cytokines, reducing triglycerides, and normalizing insulin resistance glucose tolerance test. These data indicate that ⁇ 7-selective ligands are useful for the management of the metabolic syndrome (diabetes I and II, atherosclerosis, obesity).
  • statins include atorvastatin, cerivastatin, fluvastatin, lovastatin, mevastatin, pitavastatin, pravastatin, rosuvastatin, simvastatin, and additional statins, defined based on their inhibition of HMG CoA reductase.
  • statins include atorvastatin, cerivastatin, fluvastatin, lovastatin, mevastatin, pitavastatin, pravastatin, rosuvastatin, simvastatin, and additional statins, defined based on their inhibition of HMG CoA reductase.
  • Compounds useful according to the present invention are ⁇ 7 NNR selective ligands, as exemplified by Compounds A, B, and C, herein.
  • m and n individually can have a value of 1 or 2, and p can have a value of 1, 2, 3 or 4.
  • X is either oxygen or nitrogen (i.e., NR′)
  • Y is either oxygen or sulfur
  • Z is either nitrogen (i.e., NR′), a covalent bond or a linker species, A.
  • A is selected from the group —CR′ R′′-, —CR′ R′′—CR′ R′′-, —CR′ ⁇ CR′-, and —C 2 —, wherein R′ and R′′ are as hereinafter defined.
  • Z is a covalent bond or A
  • X must be nitrogen.
  • Ar is an aryl group, either carbocyclic or heterocyclic, either monocyclic or fused polycyclic, unsubstituted or substituted; and Cy is a 5- or 6-membered heteroaromatic ring, unsubstituted or substituted.
  • the invention includes compounds in which Ar is linked to the azabicycle by a carbonyl group-containing functionality, such as an amide, carbamate, urea, thioamide, thiocarbamate or thiourea functionality.
  • Ar may be bonded directly to the carbonyl (or thiocarbonyl) group or may be linked to the carbonyl (or thiocarbonyl) group through linker A.
  • the invention includes compounds that contain a 1-azabicycle, containing either a 5-, 6-, or 7-membered ring and having a total of 7, 8 or 9 ring atoms (e.g., 1-azabicyclo[2.2.1]heptane, 1-azabicyclo[3.2.1]octane, 1-azabicyclo[2.2.2]octane, and 1-azabicyclo[3.2.2]nonane).
  • 1-azabicyclo[2.2.1]heptane 1-azabicyclo[3.2.1]octane
  • 1-azabicyclo[2.2.2]octane 1-azabicyclo[3.2.2]nonane
  • the value of p is 1, Cy is 3-pyridinyl or 5-pyrimidinyl, X and Y are oxygen, and Z is nitrogen.
  • the value of p is 1, Cy is 3-pyridinyl or 5-pyrimidinyl, X and Z are nitrogen, and Y is oxygen.
  • the value of p is 1, Cy is 3-pyridinyl or 5-pyrimidinyl, X is nitrogen, Y is oxygen, and Z is a covalent bond (between the carbonyl and Ar).
  • the value of p is 1, Cy is 3-pyridinyl or 5-pyrimidinyl, X is nitrogen, Y is oxygen, Z is A (a linker species between the carbonyl and Ar).
  • the compounds of Formula 1 have one or more asymmetric carbons and can therefore exist in the form of racemic mixtures, enantiomers and diastereomers. Both relative and absolute stereochemistry at asymmetric carbons are variable (e.g., cis or trans, R or S). In addition, some of the compounds exist as E and Z isomers about a carbon-carbon double bond. All these individual isomeric compounds and their mixtures are also intended to be within the scope of Formula 1.
  • Ar includes both carbocyclic and heterocyclic aromatic rings, both monocyclic and fused polycyclic, where the aromatic rings can be 5- or 6-membered rings.
  • Representative monocyclic aryl groups include, but are not limited to, phenyl, furanyl, pyrrolyl, thienyl, pyridinyl, pyrimidinyl, oxazolyl, isoxazolyl, pyrazolyl, imidazolyl, thiazolyl, isothiazolyl and the like.
  • Fused polycyclic aryl groups are those aromatic groups that include a 5- or 6-membered aromatic or heteroaromatic ring as one or more rings in a fused ring system.
  • fused polycyclic aryl groups include naphthalene, anthracene, indolizine, indole, isoindole, benzofuran, benzothiophene, indazole, benzimidazole, benzthiazole, purine, quinoline, isoquinoline, cinnoline, phthalazine, quinazoline, quinoxaline, 1,8-naphthyridine, pteridine, carbazole, acridine, phenazine, phenothiazine, phenoxazine, and azulene.
  • Cy groups are 5- and 6-membered ring heteroaromatic groups.
  • Representative Cy groups include pyridinyl, pyrimidinyl, furanyl, pyrrolyl, thienyl, oxazolyl, isoxazolyl, pyrazolyl, imidazolyl, thiazolyl, isothiazolyl and the like, where pyridinyl is preferred.
  • Ar and Cy can be unsubstituted or can be substituted with 1, 2 or 3 substituents, such as alkyl, alkenyl, heterocyclyl, cycloalkyl, aryl, substituted aryl, arylalkyl, substituted arylalkyl, halo (e.g., F, Cl, Br, or I), —OR′, —NR′R′′, —CF 3 , —CN, —NO 2 , —C 2 R′, —SR′, —N 3 , —C( ⁇ O)NR′R′′, —NR′C( ⁇ O)R′′, —C( ⁇ O)R′, —C( ⁇ O)OR′, —OC( ⁇ O)R′, —O(CR′R′′) r C( ⁇ O)R′, —O(CR′R′′) r NR′C( ⁇ O)R′, —O(CR′R′′) r NR′SO 2 R′,
  • Compounds of Formula 1 form acid addition salts which are useful according to the present invention.
  • suitable pharmaceutically acceptable salts include inorganic acid addition salts such as chloride, bromide, sulfate, phosphate, and nitrate; organic acid addition salts such as acetate, galactarate, propionate, succinate, lactate, glycolate, malate, tartrate, citrate, maleate, fumarate, methanesulfonate, p-toluenesulfonate, and ascorbate; salts with acidic amino acid such as aspartate and glutamate.
  • the salts may be in some cases hydrates or ethanol solvates.
  • Representative compounds of Formula 1 include:
  • a second genus of ⁇ 7 NNR selective ligands (see U.S. application Ser. No. 11/465,914, Pub. No. 2007 00197579 A1; also see published international application WO 2007/024814 A1; each of which is incorporated herein by reference in its entirety), useful according to the present invention, is represented by Formula 2.
  • Y is either oxygen or sulfur, and Z is either nitrogen (i.e., NR′) or a covalent bond.
  • A is either absent or a linker species selected from the group —CR′ R′′-, —CR′R′′—CR′ R′′-, —CR′ ⁇ CR′-, and —C 2 —, wherein R′ and R′′ are as hereinafter defined.
  • Ar is an aryl group, either carbocyclic or heterocyclic, either monocyclic or fused polycyclic, unsubstituted or substituted; and Cy is a 5- or 6-membered heteroaromatic ring, unsubstituted or substituted.
  • the invention includes compounds in which Ar is linked to the diazatricycle, at the nitrogen of the pyrrolidine ring, by a carbonyl group-containing functionality, forming an amide or a urea functionality.
  • Ar may be bonded directly to the carbonyl group-containing functionality or may be linked to the carbonyl group-containing functionality through linker A.
  • the invention includes compounds that contain a diazatricycle, containing a 1-azabicyclo[2.2.2]octane.
  • a “carbonyl group-containing functionality” is a moiety of the formula —C( ⁇ Y)—Z—, where Y are Z are as defined herein.
  • Cy is 3-pyridinyl or 5-pyrimidinyl, Y is oxygen, Z is a covalent bond and A is absent. In another embodiment, Cy is 3-pyridinyl or 5-pyrimidinyl, Y is oxygen, Z is nitrogen and A is absent. In a third embodiment, Cy is 3-pyridinyl or 5-pyrimidinyl, Y is oxygen, Z is a covalent bond, and A is a linker species. In a fourth embodiment, Cy is 3-pyridinyl or 5-pyrimidinyl, Y is oxygen, Z is nitrogen and A is a linker species.
  • the junction between the azacycle and the azabicycle can be characterized by any of the various relative and absolute stereochemical configurations at the junction sites (e.g., cis or trans, R or S).
  • the compounds have one or more asymmetric carbons and can therefore exist in the form of racemic mixtures, enantiomers and diastereomers.
  • some of the compounds exist as E and Z isomers about a carbon-carbon double bond. All these individual isomeric compounds and their mixtures are also intended to be within the scope of the present invention.
  • Ar includes both carbocyclic and heterocyclic aromatic rings, both monocyclic and fused polycyclic, where the aromatic rings can be 5- or 6-membered rings.
  • Representative monocyclic aryl groups include, but are not limited to, phenyl, furanyl, pyrrolyl, thienyl, pyridinyl, pyrimidinyl, oxazolyl, isoxazolyl, pyrazolyl, imidazolyl, thiazolyl, isothiazolyl and the like.
  • Fused polycyclic aryl groups are those aromatic groups that include a 5- or 6-membered aromatic or heteroaromatic ring as one or more rings in a fused ring system.
  • fused polycyclic aryl groups include naphthalene, anthracene, indolizine, indole, isoindole, benzofuran, benzothiophene, indazole, benzimidazole, benzthiazole, purine, quinoline, isoquinoline, cinnoline, phthalazine, quinazoline, quinoxaline, 1,8-naphthyridine, pteridine, carbazole, acridine, phenazine, phenothiazine, phenoxazine, and azulene.
  • Cy groups are 5- and 6-membered ring heteroaromatic groups.
  • Representative Cy groups include pyridinyl, pyrimidinyl, furanyl, pyrrolyl, thienyl, oxazolyl, isoxazolyl, pyrazolyl, imidazolyl, thiazolyl, isothiazolyl and the like, where pyridinyl is preferred.
  • Ar and Cy can be unsubstituted or can be substituted with 1, 2 or 3 substituents, such as alkyl, alkenyl, heterocyclyl, cycloalkyl, aryl, substituted aryl, arylalkyl, substituted arylalkyl, halo (e.g., F, Cl, Br, or I), —OR′, —NR′R′′, —CF 3 , —CN, —NO 2 , —C 2 R′, —SR', —N 3 , —C( ⁇ O)NR′R′′, —NR′C( ⁇ O)R′′, —C( ⁇ O)R′, —C( ⁇ O)OR′, —OC( ⁇ O)R′, —O(CR′R′′) r C( ⁇ O)R′, —O(CR′R′′) r NR′C( ⁇ O)R′, —O(CR′R′′) r NR′SO 2 R′,
  • Compounds of Formula 2 form acid addition salts which are useful according to the present invention.
  • suitable pharmaceutically acceptable salts include inorganic acid addition salts such as chloride, bromide, sulfate, phosphate, and nitrate; organic acid addition salts such as acetate, galactarate, propionate, succinate, lactate, glycolate, malate, tartrate, citrate, maleate, fumarate, methanesulfonate, p-toluenesulfonate, and ascorbate; salts with acidic amino acid such as aspartate and glutamate.
  • the salts may be in some cases hydrates or ethanol solvates.
  • Representative compounds of Formula 2 include:
  • the nitrogen at the position indicated above as the 5-position is the nitrogen involved in the formation of the amides, thioamides, ureas and thioureas described herein.
  • Compounds useful according to the present invention also include compounds of Formula 3:
  • X is either oxygen or nitrogen (i.e., NR′), and Z is either nitrogen (i.e., NR′), —CR′ ⁇ CR′- or a covalent bond, provided that X must be nitrogen when Z is —CR′ ⁇ CR′- or a covalent bond, and further provided that X and Z are not simultaneously nitrogen.
  • Ar is an aryl group, either carbocyclic or heterocyclic, either monocyclic or fused polycyclic, unsubstituted or substituted;
  • R′ is hydrogen, C 1 -C 8 alkyl (e.g., straight chain or branched alkyl, preferably C 1 -C 5 , such as methyl, ethyl, or isopropyl), aryl, or arylalkyl (such as benzyl).
  • Compounds useful according to the present invention also include compounds of Formula 4:
  • Ar is an aryl group, either carbocyclic or heterocyclic, either monocyclic or fused polycyclic, unsubstituted or substituted;
  • R is hydrogen, C 1 -C 8 alkyl (e.g., straight chain or branched alkyl, preferably C 1 -C 5 , such as methyl, ethyl, or isopropyl), aryl, or arylalkyl (such as benzyl).
  • Such compounds are disclosed as ⁇ 7 selective ligands in, for instance, PCTs WO 03/018585, WO 03/018586, WO 03/022856, WO 03/070732, WO 03/072578, WO 04/039815 and WO 04/052348, and U.S. Pat. No. 6,562,816, each of which is incorporated herein in its entirety.
  • Compounds useful according to the present invention also include compounds of Formula 5:
  • n 1 or 2;
  • Ar is an aryl group, either carbocyclic or heterocyclic, either monocyclic or fused polycyclic, unsubstituted or substituted; and Z is oxygen, —CC—, —CH ⁇ CH— or a covalent bond.
  • Such compounds are disclosed as ⁇ 7 selective ligands in, for instance, PCTs WO 00/058311, WO 04/016616, WO 04/016617, 04/061510, WO 04/061511 and WO 04/076453, each of which is incorporated herein in its entirety.
  • Compounds useful according to the present invention also include compounds of Formula 6:
  • Ar is a fused polycyclic, heterocyclic aryl group, unsubstituted or substituted; and Z is —CH 2 — or a covalent bond.
  • Such compounds are disclosed as ⁇ 7 selective ligands in, for instance, PCTs WO 03/119837 and WO 05/111038 and U.S. Pat. No. 6,881,734, each of which is herein incorporated by reference in its entirety.
  • Compounds useful according to the present invention also include compounds of Formula 7:
  • Ar is an aryl group, either carbocyclic or heterocyclic, either monocyclic or fused polycyclic, unsubstituted or substituted;
  • X is either CH or N;
  • Z is either oxygen, nitrogen (NR) or a covalent bond; and
  • R is H or alkyl.
  • Z—Ar is absent from Formula 7.
  • Such compounds are disclosed as ⁇ 7 selective ligands in, for instance, PCTs WO 00/042044, WO 02/096912, WO 03/087102, WO 03/087103, WO 03/087104, WO 05/030778, WO 05/042538 and WO 05/066168, and U.S. Pat. No. 6,110,914, U.S. Pat. No. 6,369,224, U.S. Pat. No. 6,569,865, U.S. Pat. No. 6,703,502, U.S. Pat. No. 6,706,878, U.S. Pat. No. 6,995,167, U.S. Pat. No. 7,186,836 and U.S. Pat. No. 7,196,096, each of which is incorporated herein by reference in its entirety.
  • Compounds useful according to the present invention also include compounds of Formula 8:
  • Ar is an aryl group, either carbocyclic or heterocyclic, either unsubstituted or substituted.
  • Compounds useful according to the present invention also include compounds of Formula 9:
  • Ar is an aryl group, either carbocyclic or heterocyclic, either monocyclic or fused polycyclic, unsubstituted or substituted (preferably by aryl or aryloxy substituents).
  • Such compounds are disclosed as ⁇ 7 selective ligands in, for instance, PCTs WO 04/016608, WO 05/066166, WO 05/066167, WO 07/018,738, and U.S. Pat. No. 7,160,876, each of which is herein incorporated by reference in its entirety.
  • Compounds useful according to the present invention also include compounds of Formula 10:
  • Ar is an phenyl group, unsubstituted or substituted, and Z is either —CH ⁇ CH— or a covalent bond.
  • Such compounds are disclosed as ⁇ 7 ligands in, for instance, PCTs WO 92/15306, WO 94/05288, WO 99/10338, WO04/019943, WO 04/052365 and WO 06/133303, and U.S. Pat. No. 5,741,802 and U.S. Pat. No. 5,977,144, each of which is herein incorporated by reference in its entirety.
  • Compounds useful according to the present invention also include compounds of Formula 11:
  • n is 1 or 2; R is H or alkyl, but most preferably methyl; X is nitrogen or CH; Z is NH or a covalent bond, and when X is nitrogen, Z must be a covalent bond; and Ar is an indolyl, indazolyl, 1,2-benzisoxazolyl or 1,2-benzisothiazolyl moiety, attached in each case via the 3 position to the carbonyl.
  • Such compounds are disclosed as ⁇ 7 ligands in, for instance, PCT WO 06/001894, herein incorporated by reference in its entirety.
  • 3-Quinuclidinone hydrochloride (8.25 kg, 51.0 mol) and methanol (49.5 L) were added to a 100 L glass reaction flask, under an nitrogen atmosphere, equipped with a mechanical stirrer, temperature probe, and condenser.
  • Potassium hydroxide (5.55 kg, 99.0 mol) was added via a powder funnel over an approximately 30 min period, resulting in a rise in reaction temperature from 50° C. to 56° C.
  • 3-pyridinecarboxaldehyde (4.80 kg, 44.9 mol) was added to the reaction mixture.
  • the resulting mixture was stirred at 20° C. ⁇ 5° C. for a minimum of 12 h, as the reaction was monitored by thin layer chromatography (TLC).
  • reaction mixture was filtered through a sintered glass funnel and the filter cake was washed with methanol (74.2 L).
  • the filtrate was concentrated, transferred to a reaction flask, and water (66.0 L) was added.
  • the suspension was stirred for a minimum of 30 min, filtered, and the filter cake was washed with water (90.0 L) until the pH of the rinse was 7-9.
  • the solid was dried under vacuum at 50° C. ⁇ 5° C. for a minimum of 12 h to give 8.58 kg (89.3%) of 2-((3-pyridinyl)methylene)-1-azabicyclo[2.2.2]octan-3-one.
  • the evacuation and pressurization with hydrogen were repeated 2 more times, leaving the reactor under 20 inches water pressure of hydrogen gas after the third pressurization.
  • the reaction mixture was stirred at 20° C. ⁇ 5° C. for a minimum of 12 h, and the reaction was monitored via TLC.
  • the suspension was filtered through a bed of Celite®545 (1.9 kg) on a sintered glass funnel, and the filter cake was washed with methanol (10.1 L).
  • the filtrate was concentrated to obtain a semi-solid which was transferred, under an nitrogen atmosphere, to a 200 L reaction flask fitted with a mechanical stirrer, condenser, and temperature probe.
  • the semi-solid was dissolved in ethanol (57.2 L), and di-p-toluoyl-D-tartaric acid (DTTA) (9.74 kg, 25.2 mol) was added.
  • DTTA di-p-toluoyl-D-tartaric acid
  • the stirring reaction mixture was heated at reflux for a minimum of 1 h, and for an additional minimum of 12 h while the reaction was cooled to between 15° C. and 30° C.
  • the suspension was filtered using a tabletop filter, and the filter cake was washed with ethanol (11.4 L).
  • Dichloromethane (34.7 L) was added to the remaining aqueous phase, and the suspension was stirred for between 2 min and 10 min. The layers were allowed to separate for between 2 min and 10 min. Again, the organic phase was removed and dried over anhydrous sodium sulfate. The extraction of the aqueous phase with dichloromethane (34.7 L) was repeated one more time, as above. Samples of each extraction were submitted for chiral HPLC analysis. The sodium sulfate was removed by filtration, and the filtrates were concentrated to obtain (2S)-2-((3-pyridinyl)methyl)-1-azabicyclo[2.2.2]octan-3-one (4.0 kg) as a solid.
  • reaction mixture was cooled to below ⁇ 5° C., and sodium borohydride (1.53 kg, 40.5 mol) was added in portions, keeping the reaction temperature below 15° C. (this addition took several hours).
  • the reaction mixture was then stirred at 15° C. ⁇ 10° C. for a minimum of 1 h.
  • the reaction was monitored by HPLC, and upon completion of the reaction (as indicated by less than 0.5% of (2S)-2-((3-pyridinyl)methyl)-1-azabicyclo[2.2.2]octan-3-one remaining), 2 M sodium hydroxide (15.99 L) was added and the mixture was stirred for a minimum of 10 min.
  • the reaction mixture was filtered through a bed of Celite®545 in a tabletop funnel. The filter cake was washed with ethanol (15.23 L), and the filtrate was concentrated to obtain an oil.
  • the concentrate was transferred to a clean 100 L glass reaction flask equipped with a mechanical stirrer and temperature probe under an inert atmosphere. Water (1 L) was added, and the mixture was cooled to 0° C. ⁇ 5° C. 2 M Hydrochloric acid (24 L) was added to the mixture to adjust the pH of the mixture to pH 1. The mixture was then stirred for a minimum of 10 min, and 2 M sodium hydroxide (24 L) was slowly added to adjust the pH of the mixture to pH 14. The mixture was stirred for a minimum of 10 min, and the aqueous phase was extracted with dichloromethane (3 ⁇ 15.23 L).
  • the filter cake was transferred to a clean 100 L glass reaction flask equipped with a mechanical stirrer, temperature probe, and condenser under an inert atmosphere.
  • a 9:1 ethanol/water solution (30.7 L) was added, and the resulting slurry was heated at gentle reflux for a minimum of 1 h.
  • the reaction mixture was then stirred for a minimum of 12 h while cooling to between 15° C. and 30° C.
  • the mixture was filtered and the filter cake was washed with ethanol (5.76 L).
  • the product was collected and dried under vacuum at 50° C. ⁇ 5° C.
  • the precipitated salt was collected by suction filtration and recrystallized from 5 mL of methanol. Air drying left 1.4 g of white solid, which was partitioned between chloroform (5 mL) and 2 M sodium hydroxide (5 mL). The chloroform layer and a 5 mL chloroform extract of the aqueous layer were combined, dried (anhydrous sodium sulfate) and concentrated to give a colorless oil (0.434 g). The enantiomeric purity of this free base was determined by conversion of a portion into its N-(tert-butoxycarbonyl)-L-prolinamide, which was then analyzed for diastereomeric purity (98%) using LCMS.
  • the mother liquor from the initial crystallization was made basic ( ⁇ pH 11) with 2 M sodium hydroxide and extracted twice with chloroform (10 mL). The chloroform extracts were dried (anhydrous sodium sulfate) and concentrated to give an oil.
  • Diphenylchlorophosphate (0.35 mL, 0.46 g, 1.7 mmol) was added drop-wise to a solution of benzofuran-2-carboxylic acid (0.28 g, 1.7 mmol) and triethylamine (0.24 mL, 0.17 g, 1.7 mmol) in dry dichloromethane (5 mL).
  • Diphenylchlorophosphate (96 ⁇ L, 124 mg, 0.46 mmol) was added drop-wise to a solution of the benzofuran-2-carboxylic acid (75 mg, 0.46 mmol) (that derived from the di-p-toluoyl-L-tartaric acid salt) and triethylamine (64 ⁇ L, 46 mg, 0.46 mmol) in dry dichloromethane (1 mL).
  • 3-Quinuclidinone hydrochloride (8.25 kg, 51.0 mol) and methanol (49.5 L) were added to a 100 L glass reaction flask, under an nitrogen atmosphere, equipped with a mechanical stirrer, temperature probe, and condenser.
  • Potassium hydroxide (5.55 kg, 99.0 mol) was added via a powder funnel over an approximately 30 min period, resulting in a rise in reaction temperature from 50° C. to 56° C.
  • 3-pyridinecarboxaldehyde (4.80 kg, 44.9 mol) was added to the reaction mixture.
  • the resulting mixture was stirred at 20° C. ⁇ 5° C. for a minimum of 12 h, as the reaction was monitored by thin layer chromatography (TLC).
  • reaction mixture was filtered through a sintered glass funnel and the filter cake was washed with methanol (74.2 L).
  • the filtrate was concentrated, transferred to a reaction flask, and water (66.0 L) was added.
  • the suspension was stirred for a minimum of 30 min, filtered, and the filter cake was washed with water (90.0 L) until the pH of the rinse was 7-9.
  • the solid was dried under vacuum at 50° C. ⁇ 5° C. for a minimum of 12 h to give 8.58 kg (89.3%) of 2-((3-pyridinyl)methylene)-1-azabicyclo[2.2.2]octan-3-one.
  • the evacuation and pressurization with hydrogen were repeated 2 more times, leaving the reactor under 20 inches water pressure of hydrogen gas after the third pressurization.
  • the reaction mixture was stirred at 20° C. ⁇ 5° C. for a minimum of 12 h, and the reaction was monitored via TLC.
  • the suspension was filtered through a bed of Celite®545 (1.9 kg) on a sintered glass funnel, and the filter cake was washed with methanol (10.1 L).
  • the filtrate was concentrated to obtain a semi-solid which was transferred, under an nitrogen atmosphere, to a 200 L reaction flask fitted with a mechanical stirrer, condenser, and temperature probe.
  • the semi-solid was dissolved in ethanol (57.2 L), and di-p-toluoyl-D-tartaric acid (DTTA) (9.74 kg, 25.2 mol) was added.
  • DTTA di-p-toluoyl-D-tartaric acid
  • the stirring reaction mixture was heated at reflux for a minimum of 1 h, and for an additional minimum of 12 h while the reaction was cooled to between 15° C. and 30° C.
  • the suspension was filtered using a tabletop filter, and the filter cake was washed with ethanol (11.4 L).
  • Dichloromethane (34.7 L) was added to the remaining aqueous phase, and the suspension was stirred for between 2 min and 10 min. The layers were allowed to separate for between 2 min and 10 min. Again, the organic phase was removed and dried over anhydrous sodium sulfate. The extraction of the aqueous phase with dichloromethane (34.7 L) was repeated one more time, as above. Samples of each extraction were submitted for chiral HPLC analysis. The sodium sulfate was removed by filtration, and the filtrates were concentrated to obtain (2S)-2-((3-pyridinyl)methyl)-1-azabicyclo[2.2.2]octan-3-one (4.0 kg) as a solid.
  • reaction mixture was cooled to below ⁇ 5° C., and sodium borohydride (1.53 kg, 40.5 mol) was added in portions, keeping the reaction temperature below 15° C. (this addition took several hours).
  • the reaction mixture was then stirred at 15° C. ⁇ 10° C. for a minimum of 1 h.
  • the reaction was monitored by HPLC, and upon completion of the reaction (as indicated by less than 0.5% of (2S)-2-((3-pyridinyl)methyl)-1-azabicyclo[2.2.2]octan-3-one remaining), 2 M sodium hydroxide (15.99 L) was added and the mixture was stirred for a minimum of 10 min.
  • the reaction mixture was filtered through a bed of Celite®545 in a tabletop funnel. The filter cake was washed with ethanol (15.23 L), and the filtrate was concentrated to obtain an oil.
  • the concentrate was transferred to a clean 100 L glass reaction flask equipped with a mechanical stirrer and temperature probe under an inert atmosphere. Water (1 L) was added, and the mixture was cooled to 0° C. ⁇ 5° C. 2 M Hydrochloric acid (24 L) was added to the mixture to adjust the pH of the mixture to pH 1. The mixture was then stirred for a minimum of 10 min, and 2 M sodium hydroxide (24 L) was slowly added to adjust the pH of the mixture to pH 14. The mixture was stirred for a minimum of 10 min, and the aqueous phase was extracted with dichloromethane (3 ⁇ 15.23 L).
  • reaction mixture was heated at near-reflux for a minimum of 12 h, and the reaction was monitored by TLC. Upon completion of the reaction, the reaction mixture was cooled to below 45° C., and it was filtered through a bed of Celite®545 (1.2 kg) on a sintered glass funnel. The filter cake was rinsed with ethanol (3 L) and the filtrate was concentrated to obtain an aqueous phase. Water (500 mL) was added to the concentrated filtrate, and this combined aqueous layer was washed with methyl tert-butyl ether (MTBE) (2 ⁇ 4.79 L). 2 M Sodium hydroxide (19.5 L) was added to the aqueous phase to adjust the pH of the mixture to pH 14.
  • MTBE methyl tert-butyl ether
  • the filter cake was transferred to a clean 100 L glass reaction flask equipped with a mechanical stirrer, temperature probe, and condenser under an inert atmosphere.
  • a 9:1 ethanol/water solution (30.7 L) was added, and the resulting slurry was heated at gentle reflux for a minimum of 1 h.
  • the reaction mixture was then stirred for a minimum of 12 h while cooling to between 15° C. and 30° C.
  • the mixture was filtered and the filter cake was washed with ethanol (5.76 L).
  • the product was collected and dried under vacuum at 50° C. ⁇ 5° C.
  • a hydrochloric acid/THF solution was prepared by adding of concentrated hydrochloric acid (1.93 mL of 12M, 23.2 mmol) drop-wise to 8.5 mL of chilled THF. The solution was warmed to ambient temperature. To a round bottom flask was added (2S,3R)—N-(2-((3-pyridinyl)methyl)-1-azabicyclo[2.2.2]oct-3-yl)benzofuran-2-carboxamide (8.49 g, 23.5 mmol) and acetone (85 mL). The mixture was stirred and heated at 45-50° C. until a complete solution was obtained.
  • Compounds A, B, and C are ⁇ 7-selective ligands.
  • Compounds A, B and C exhibited E max values >50% in an electrophysiology functional assay in Xenopus laevis oocytes transiently expressing human ⁇ 7 nicotinic receptor.
  • the IC50s for Compound A are >10 micromolar at more than 60 targets in a receptor profile screen.
  • PTPases protein tyrosine phosphatases
  • LAR protein tyrosine phosphatases
  • SHP-2 protein tyrosine phosphatases
  • Glucose Metabolism Similar to the results obtained for food intake and body weight gain, at the end of seven weeks of treatment, plasma glucose levels in the obese (db ⁇ ) mice treated with the ⁇ 7 agonist were significantly lower (p ⁇ 0.01) than those in the untreated PTP1B+ and PTP1B ⁇ mice.
  • the ⁇ 7 nAChR antagonist MLA was given concurrently with treatment compound and the mice showed no significant decrease in plasma glucose.
  • Total glycemic load reflects both fasting and post-prandial glucose levels in the blood.
  • a time averaged index of glycemic load is accumulation of advanced glycation end products (AGEs), which can be estimated from the glycosylation of hemoglobin, HbA1c.
  • AGEs advanced glycation end products
  • Lean treated and non-treated PTP1B+ and PTP1B ⁇ mice all showed HbA1C levels lower than 5%, consistent with normal glycemic control.
  • obese mice showed markedly elevated HbA1c levels, consistent with the observed glucose intolerance fasting hyperglycemia, which were significantly lowered (p ⁇ 0.01) by the ⁇ 7 agonist.
  • HbA1c levels were markedly reduced and further reduced by treatment.
  • ⁇ 7 nAChR plays a central role in regulating both the fasting and post-prandial glucose levels in the blood and that this effect is not dependent on PTP1B.
  • MLA the increased insulin sensitivity induced by the ⁇ 7 agonist is suppressed.
  • Lipid Metabolism Treated and non-treated lean mice show normal levels of triglycerides. However, obese mice display elevated fasting triglyceride levels, consistent with the loss of insulin sensitivity in fat cells. Nevertheless, when the obese mice were treated they displayed largely normal levels of triglycerides, an effect which was blocked by the ⁇ 7 antagonist MLA, suggesting a normalization of adipocyte insulin resistance via an ⁇ 7 nAChR-mediated pathway.
  • Plasma TNF- ⁇ Levels Plasma concentration of inflammatory mediators such as TNF- ⁇ is increased in the insulin resistant states of obesity and type 2 diabetes. Reduction of the levels of TNF ⁇ in diabetic mice correlates with increased insulin sensitivity and decreased plasma insulin and blood glucose levels. Treated and non-treated lean mice showed no change in the plasma levels of TNF- ⁇ , but obese mice had elevated fasting plasma TNF- ⁇ levels. However, when the obese mice were treated, they displayed significantly decreased plasma TNF- ⁇ levels and this was blocked by the ⁇ 7 antagonist MLA, confirming that ⁇ 7 nAChRs are directly involved in blocking the obesity-induced increase of TNF- ⁇ and hence the decreased insulin resistance.
  • mice used in these studies were the leptin receptor deficient db/db mice on a C57BL6 background obtained from Jackson Laboratories and PTP1B-null mice on a mixed C57BL6/Balb C background from Dr. Michel Tremblay at the Cancer Institute at McGill University in Montreal, Canada. Because obese db/db mice are infertile, mice were generated as dual heterozygotes, heterozygous for both the mutant leptin receptor and the deleted PTP1B. Dual heterozygotes were interbred, producing 1:4 obese mice and 1:4 PTP-1B null mice. In this breeding configuration 1:16 were dual KO mice.
  • mice heterozygous for both genes were bred to PTP-1B null mice heterozygous for the mutant db allele.
  • 1:4 mice were obese and 1:8 were dual KO mice.
  • heterozygotes were preferred to wild-types over controls.
  • Dual heterozygous littermates were used as lean controls and littermates heterozygous for db were used as lean PTP1B KO controls.
  • Mouse genotyping At 3 weeks of age, DNA was obtained by tail clip. The genomic DNA from tail clip was used to screen for the presence of the mutant leptin receptor and deletion cassette of PTP-1B using the Polymerase Chain Reaction. Specific genotypes were determining by resolving PCR products with agarose gel electrophoresis. Deletion of PTP-1B was verified by Western analysis using an anti-PTP-1B antibody from Upstate Biotechnology.
  • Metabolic Phenotyping The effects of the tested compound (for example, Compound A at 1 mg/kg/day via oral gavage) on growth rates and food intake of mice were generated by measuring body weight and food intake bi-weekly for from ages 3 to 10 weeks. In selected cohorts, the ⁇ 7 antagonist MLA was also given via gavage, concurrently, at 3 mg/kg daily.
  • the JAK2 kinase inhibitor (AG-490) was administered intraperitoneally (IP) at 1 mg/kg daily. Fasting glucose was measured once a week after food withdrawal, with a Precision XL glucometer using tail vein bleeding. HbA1c levels were also measured from these samples with the A1C kit from Metrika, Inc.
  • mice were anesthetized with 2% isoflurane and the left carotid artery and jugular vein cannulated after an overnight fast.
  • a 10 mg bolus of glucose was injected intravenously (iv) via the jugular vein and blood glucose measured every 5 minutes for 40 minutes in a drop of blood from the carotid line.
  • a separate group of fasted mice were anesthetized by isoflurane in a rapid induction chamber and swiftly decapitated. Blood was collected in heparin and rapidly centrifuged at 4° C. to remove cells and to obtain plasma, and the samples were frozen for later analyses.
  • Plasma TNF- ⁇ concentrations were determined using ELISA assay kits from eBioscience and plasma triglyceride levels were determined using the L-Type TG H test (Wako Diagnostics), an in vitro assay for the quantitative determination of triglycerides in serum or plasma. All data are expressed as mean and SEM. Differences among all groups were compared by One Way ANOVA.
  • mice In order to induce diabetes in the mice five multiple doses of STZ (50 mg/kg ip) or vehicle (citrate buffer) were administered daily for ten days as suggested for such investigations. Mice were weighed and blood glucose levels were determined at baseline and every four days thereafter. The mice reached stable hyperglycemia within two weeks. Now in order to determine the influence of JAK2, conditional floxed JAK2 KO mice provided by Dr. Wagner were used. These mice were crossed with inducible non-tissue specific mER-Cre mice from Jackson Labs.
  • mice have an inducible element which is a mERT2-Cre fusion cDNA, which encodes the mutated murine estrogen receptor ligand-binding domain (amino acids 281 to 599, G525R) and which is insensitive to estrogen but sensitive to tamoxifen.
  • This inducible transgenic mouse line facilitates gene targeting and would be beneficial in investigating the role of JAK2 in the adult mouse.
  • the time point of Cre activity can be regulated by injections with tamoxifen and using these inducible Cre transgenic mice, we will be able to generate JAK2 KO mutants in a conditional and inducible manner.
  • Homozygous JAK2flox mice carrying the mCre/mERT were generated by breeding double heterozygous mice containing JAK2flox and Cre/mERT, and have assess the efficiency of induced Cre-mediated deletion of the loxP flanked JAK2 gene segment via Southern assay before and after intraperitoneal injections of tamoxifen.
  • Western blot analysis demonstrates that after 7 days of intraperitoneal injections of tamoxifen at a concentration of 20 mg/kg there was a total ablation of JAK2 expression in the pancreas while there is no effect on the expression of Actin.
  • mice had grossly normal appearance, activity and behavior.
  • mice fasting glucose levels were measured at least twice a week via tail vein bleeding with a Precision XL glucometer while HbA1c levels were measured using the A1C kit from Metrika Inc.
  • fasted mice were anesthetized by isofluorance in a rapid induction chamber and swiftly decapitated. Trunk blood was collected in heparin and rapidly centrifuged at 4C to remove blood cells and obtain plasma. Samples were frozen for later analyses. Plasma insulin, TNF ⁇ and IL-6 concentration were determined using ELISA assay kits.
  • mice Animal Models and Metabolic Phenotyping: Parental strains of mice used in these studies were the leptin receptor deficient db/db fat mice or leptin receptor wild type DB/DB lean mice on a C57BL6 background obtained from Jackson Laboratories. Animal were treated with simvastatin and tested compound, such as Compound A at 1 mg/kg/day via gavage. Growth rates of mice were generated by measuring body weight twice weekly for 10 weeks. Daily food intake was measured in mice metabolic cages obtained from Fisher. To assess glucose tolerance, mice were anesthetized with 2% isoflurane and the left carotid artery and jugular vein cannulated after an overnite fast.
  • the compounds, Compounds A, B, and C are demonstrated to reduce weight gain, normalize glucose levels, decrease glycated hemoglobin, reduce pro-inflammatory cytokines, reduce triglycerides, and normalize insulin resistance glucose tolerance test. These data indicate that ⁇ 7 ligands, including Compounds A, B, and C, ameliorate the glycemic state in metabolic disorders such as diabetes type II and biological parameters associated with the metabolic syndrome.
  • ⁇ 7 nAChR agonists can reduce weight gain, normalize glucose levels, decrease glycated hemoglobin, reduce the pro-inflammatory cytokine TNF- ⁇ , reduce triglycerides, and normalize insulin sensitivity in transgenic models of type 2 diabetes. These effects were not prevented in obese mice lacking the phosphotyrosine phosphatase PTP1B but were fully reversed by the ⁇ 7 antagonist MLA. Furthermore, the JAK2 kinase specific inhibitor AG-490 also inhibited the ⁇ 7 agonist-induced weight loss, decreased food intake and normalization of glucose levels. ⁇ 7 nAChRs play a central role in regulating the biological parameters associated with type 2 diabetes and the metabolic syndrome.
  • the CNS modulates the immune system through the reticuloendothelial system. This CNS modulation is mediated through the vagus nerve, utilizing the major vagal neurotransmitter acetylcholine which acts upon ⁇ 7 nAChRs on macrophages.
  • Neuroprotective effects elicited by ⁇ 7-selective ligands can be traced to ⁇ 7 nAChR activation and transduction of signals to PI-3-K (phosphatidylinositol 3-kinase) and AKT (protein kinase B) through the protein tyrosine kinase Janus kinase 2 (JAK2), all of which compose a key cell survival pathway.
  • PI-3-K phosphatidylinositol 3-kinase
  • AKT protein kinase B
  • JAK2 protein tyrosine kinase Janus kinase 2
  • PTP1B protein tyrosine phosphatase
  • PTP1B has been shown to act as a negative regulator of insulin signaling. Overexpression of PTP1B impairs insulin signals, whereas loss of PTP1B is associated with increased sensitivity to insulin. PTP1B binds to and catalyzes the dephosphorylation of the insulin receptor and many of the effects of PTP1B on insulin signaling can be explained on the basis of this interaction.
  • PTP1B phosphotyrosine phosphatase
  • PTP1B antagonists have been used pharmacologically to improve glucose tolerance.
  • PTP1B has also been reported to dephosphorylate JAK2, suggesting that there is cross-talk between the ⁇ 7 nAChR-linked anti-inflammatory pathway and insulin regulation. Since PTP1B regulates body weight, adiposity and leptin action, ⁇ 7 nAChRs may play a critical role in regulating numerous aspects of the metabolic syndrome.

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US20140024673A1 (en) 2014-01-23
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