Patent Application
20050261302
The present invention relates to the use of inhibitors of the 11-beta-hydroxysteroid dehydrogenase Type 1 enzyme. The present invention further relates to the use of inhibitors of 11-beta-hydroxysteroid dehydrogenase Type 1 enzyme for the treatment of non-insulin dependent type 2 diabetes, insulin resistance, obesity, lipid disorders, metabolic syndrome, and other diseases and conditions that are mediated by excessive glucocorticoid action.
Insulin is a hormone that modulates glucose and lipid metabolism. Impaired action of insulin (insulin resistance) results in reduced insulin-induced glucose uptake, oxidation and storage, reduced insulin-dependent suppression of fatty acid release from adipose tissue (lipolysis), and reduced insulin-mediated suppression of hepatic glucose production and secretion. Insulin resistance frequently occurs in diseases that lead to increased and premature morbidity and mortality.
Diabetes mellitus is characterized by an elevation of plasma glucose levels (hyperglycemia) in the fasting state or after administration of glucose during a glucose tolerance test. While this disease may be caused by several underlying factors, it is generally grouped into two categories, Type 1 and Type 2 diabetes. Type 1 diabetes (or insulin dependent diabetes mellitus, IDDM) is caused by a reduction of production and secretion of insulin. In type 2 diabetes, also referred to as non-insulin dependent diabetes mellitus, or NIDDM, insulin resistance is a significant pathogenic factor in the development of hyperglycemia. Typically, the insulin levels in type 2 diabetes patients are elevated (i.e., hyperinsulinemia), but this compensatory increase is not sufficient to overcome the insulin resistance. Persistent or uncontrolled hyperglycemia in both type 1 and type 2 diabetes mellitus is associated with increased incidence of macrovascular and/or microvascular complications including atherosclerosis, coronary heart disease, peripheral vascular disease, stroke, nephropathy, neuropathy, and retinopathy.
Insulin resistance, even in the absence of profound hyperglycemia, is a component of the metabolic syndrome. Recently, diagnostic criteria for metabolic syndrome have been established. To qualify a patient as having metabolic syndrome, three out of the five following criteria must be met: elevated blood pressure above 130/85 mmHg, fasting blood glucose above 110 mg/dl, abdominal obesity above 40″ (men) or 35″ (women) waist circumference, and blood lipid changes as defined by an increase in triglycerides above 150 mg/dl or decreased HDL cholesterol below 40 mg/dl (men) or 50 mg/dl (women). It is currently estimated that 50 million adults, in the US alone, fulfill these criteria. That population, whether or not they develop overt diabetes mellitus, are at increased risk of developing the macrovascular and microvascular complications of type 2 diabetes listed above.
Available treatments for type 2 diabetes have recognized limitations. Diet and physical exercise can have profound beneficial effects in type 2 diabetes patients, but compliance is poor. Even in patients having good compliance, other forms of therapy may be required to further improve glucose and lipid metabolism.
One therapeutic strategy is to increase insulin levels to overcome insulin resistance. This may be achieved through direct injection of insulin or through stimulation of the endogenous insulin secretion in pancreatic beta cells. Sulfonylureas (e.g., tolbutamide and glipizide) or meglitinide are examples of drugs that stimulate insulin secretion (insulin secretagogues) thereby increasing circulating insulin concentrations high enough to stimulate insulin-resistant tissue. However, insulin and insulin secretagogues may lead to dangerously low glucose concentrations (i.e., hypoglycemia). In addition, insulin secretagogues frequently lose therapeutic potency over time.
Two biguanides, metformin and phenformin, may improve insulin sensitivity and glucose metabolism in diabetic patients. However, the mechanism of action is not well understood. Both compounds may lead to lactic acidosis and gastrointestinal side effects (e.g., nausea or diarrhea).
Alpha-glucosidase inhibitors (e.g., acarbose) may delay carbohydrate absorption from the gut after meals, which may in turn lower blood glucose levels, particularly in the postprandial period. Like biguanides, these compounds may also cause gastrointestinal side effects.
Glitazones (i.e. 5-benzylthiazolidine-2,4-diones) are a newer class of compounds used in the treatment of type 2 diabetes. These agents may reduce insulin resistance in multiple tissues thus lowering blood glucose. The risk of hypoglycemia may also be avoided. Glitazones modify the activity of the peroxisome proliferator activated receptor (PPAR) gamma subtype. PPAR is currently believed to be the primary therapeutic target for the main mechanism of action for the beneficial effects of these compounds. Other modulators of the PPAR family of proteins are currently in development for the treatment of type 2 diabetes and/or dyslipidemia. Marketed glitazones suffer from side effects including bodyweight gain and peripheral edema.
Additional treatments to normalize blood glucose levels in patients with diabetes mellitus are needed. As a result other therapeutic strategies are being explored including: glucagon-like peptide 1 (GLP-1) analogues and inhibitors of dipeptidyl peptidase IV which increase insulin secretion, inhibitors of key enzymes involved in the hepatic glucose production and secretion (e.g., fructose-1,6-bisphosphatase inhibitors), and direct modulation of enzymes involved in insulin signaling (e.g., protein tyrosine phosphatase-1B, PTP-1B).
Another method of treating or prophylactically treating diabetes mellitus is using inhibitors of 11-β-bydroxysteroid dehydrogenase Type 1 (11β-HSD1), as outlined in J. R. Seckl et al., Endocrinology, 142: 1371-1376, 2001, and references cited therein. Glucocorticoids are steroid hormones that are potent regulators of glucose and lipid metabolism. Excessive glucocorticoid action may lead to insulin resistance, type 2 diabetes, dyslipidemia, increased abdominal obesity, and hypertension. Glucocorticoids circulate in the blood in an active form (i.e., cortisol in humans) and an inactive form (i.e., cortisone in humans). 11β-HSD1, which is highly expressed in liver and adipose tissue, converts cortisone to cortisol leading to higher local concentration of cortisol. Inhibition of 11⊕-HSD1 prevents or decreases the tissue specific amplification of glucocorticoid action thus imparting beneficial effects on blood pressure and glucose- and lipid-metabolism.
Thus, inhibiting 11β-HSD1 would benefit patients suffering from non-insulin dependent type 2 diabetes, insulin resistance, obesity, lipid disorders, metabolic syndrome, and other diseases and conditions mediated by excessive glucocorticoid action.
One aspect of the present invention is directed toward a method of inhibiting the 11-beta-hydroxysteroid dehydrogenase Type I enzyme in a mammal, comprising administering a therapeutically effective amount of a compound of formula (I),
A further aspect of the present invention includes the use of the compounds of formula (I) for the treatment of disorders by inhibiting 11-beta-hydroxysteroid dehydrogenase Type 1 enzyme in a mammal. Such disorders include, but are not limited to, non-insulin dependent type 2 diabetes, insulin resistance, obesity, lipid disorders, metabolic syndrome, and other diseases and conditions mediated by excessive glucocorticoid action.
All patents, patent applications, and literature references cited in the specification are herein incorporated by reference in their entirety.
One particular embodiment of the present invention is directed toward a method of inhibiting the 11-beta-hydroxysteroid dehydrogenase Type I enzyme in a mammal, comprising administering a therapeutically effective amount of a compound of formula (I),
Another embodiment of the present invention is directed toward a method of inhibiting the 11-beta-hydroxysteroid dehydrogenase Type I enzyme in a mammal, comprising administering a therapeutically effective amount of a compound of formula (II),
Another embodiment of the present invention is directed toward a method of inhibiting the 11-beta-hydroxysteroid dehydrogenase Type I enzyme in a mammal, comprising administering a therapeutically effective amount of a compound of formula (III),
Another embodiment of the present invention is directed toward a method of inhibiting the 11-beta-hydroxysteroid dehydrogenase Type I enzyme in a mammal, comprising administering a therapeutically effective amount of a compound of formula (IV),
Another embodiment of the present invention is directed toward a method of inhibiting the 11-beta-hydroxysteroid dehydrogenase Type I enzyme in a mammal, comprising administering a therapeutically effective amount of a compound of formula (V),
Another embodiment of the present invention is directed toward a method of inhibiting the 11-beta-hydroxysteroid dehydrogenase Type I enzyme in a mammal, comprising administering a therapeutically effective amount of a compound of formula (VI),
Another embodiment of the present invention is directed toward a method of inhibiting the 11-beta-hydroxysteroid dehydrogenase Type I enzyme in a mammal, comprising administering a therapeutically effective amount of a compound of formula (VII),
Another embodiment of the present invention is directed toward a method of inhibiting the 11-beta-hydroxysteroid dehydrogenase Type I enzyme in a mammal, comprising administering a therapeutically effective amount of a compound of formula (VIII),
Another embodiment of the present invention is directed toward a method of inhibiting the 11-beta-hydroxysteroid dehydrogenase Type I enzyme in a mammal, comprising administering a therapeutically effective amount of a compound of formula (IX),
Another embodiment of the present invention is directed toward a method of inhibiting the 11-beta-hydroxysteroid dehydrogenase Type I enzyme in a mammal, comprising administering a therapeutically effective amount of a compound of formula (X),
Another embodiment of the present invention is directed toward a method of treating or prophylactically treating disorders in a mammal by inhibiting 11-beta-hydroxysteroid dehydrogenase Type I enzyme, comprising administering to a mammal, a therapeutically effective amount of a compound of formula (I, II, III, IV, V, VI, VII, VIII, IX or X).
Another embodiment of the present invention is directed toward a method of treating or prophylactically treating non-insulin dependent type 2 diabetes, insulin resistance, obesity, lipid disorders, metabolic syndrome or diseases and conditions that are mediated by excessive glucocorticoid action, in a mammal by inhibiting 11-beta-hydroxysteroid dehydrogenase Type I enzyme, comprising administering to a mammal, a therapeutically effective amount of a compound of formula (I, II, III, IV, V, VI, VII, VIII, IX or X).
The term “alkoxy,” as used herein, refers to an alkyl group, as defined herein, appended to the parent molecular moiety through an oxygen atom. Representative examples of alkoxy include, but are not limited to, methoxy, ethoxy, propoxy, 2-propoxy, butoxy, tert-butoxy, pentyloxy, and hexyloxy.
The term “alkoxyalkyl,” as used herein, refers to an alkoxy group, as defined herein, appended to the parent molecular moiety through an alkyl group, as defined herein. Representative examples of alkoxyalkyl include, but are not limited to, tert-butoxymethyl, 2-ethoxyethyl, 2-methoxyethyl, and methoxymethyl.
The term “alkoxycarbonyl,” as used herein, refers to an alkoxy group, as defined herein, appended to the parent molecular moiety through a carbonyl group, as defined herein. Representative examples of alkoxycarbonyl include, but are not limited to, methoxycarbonyl, ethoxycarbonyl, and tert-butoxycarbonyl.
The term “alkyl,” as used herein, refers to a straight or branched chain hydrocarbon containing from 1 to 10 carbon atoms. Representative examples of alkyl include, but are not limited to, methyl, ethyl, n-propyl, iso-propyl, n-butyl, sec-butyl, iso-butyl, tert-butyl, n-pentyl, isopentyl, neopentyl, n-hexyl, 3-methylhexyl, 2,2-dimethylpentyl, 2,3-dimethylpentyl, n-heptyl, n-octyl, n-nonyl, and n-decyl.
The term “alkylcarbonyl,” as used herein, refers to an alkyl group, as defined herein, appended to the parent molecular moiety through a carbonyl group, as defined herein. Representative examples of alkylcarbonyl include, but are not limited to, acetyl, 1-oxopropyl, 2,2-dimethyl-1-oxopropyl, 1-oxobutyl, and 1-oxopentyl.
The term “alkylsulfonyl,” as used herein, refers to an alkyl group, as defined herein, appended to the parent molecular moiety through a sulfonyl group, as defined herein. Representative examples of alkylsulfonyl include, but are not limited to, methylsulfonyl and ethylsulfonyl.
The term “alkyl-NH,” as used herein, refers to an alkyl group, as defined herein, appended to the parent molecular moiety through a nitrogen atom.
The term “alkyl-NH-alkyl,” as used herein, refers to an alkyl-NH group, as defined herein, appended to the parent molecular moiety through an alkyl group, as defined herein.
The term “aryl,” as used herein, refers to a monocyclic-ring system or a polycyclic-ring system wherein one or more of the fused rings are aromatic. Representative examples of aryl include, but are not limited to, anthracenyl, azulenyl, fluorenyl, indanyl, indenyl, naphthyl, phenyl, and tetrahydronaphthyl.
The aryl groups of this invention may be optionally substituted with 0, 1, 2, 3, 4 or 5 substituents independently selected from alkenyl, alkenylthio, alkenyloxy, alkoxy, alkoxyalkoxy, alkoxyalkoxyalkoxy, alkoxyalkoxyalkyl, alkoxyalkyl, alkoxycarbonyl, alkoxycarbonylalkoxy, alkoxycarbonylalkyl, alkoxysulfonyl, alkyl, alkylcarbonyl, alkylcarbonylalkoxy, alkylcarbonylalkyl, alkylcarbonylalkylthio, alkylcarbonyloxy, alkylcarbonylthio, alkylsulfinyl, alkylsulfinylalkyl, alkyl sulfonyl, alkylsulfonylalkyl, alkylthio, alkylthioalkyl, alkylthioalkoxy, alkynyl, alkynyloxy, alkynylthio, carboxy, carboxyalkoxy, carboxyalkyl, cyano, cyanoalkoxy, cyanoalkyl, cyanoalkylthio, ethylenedioxy, formyl, formylalkoxy, formylalkyl, haloalkenyl, haloalkenyloxy, haloalkoxy, haloalkyl, haloalkynyl, haloalkynyloxy, halogen, hydroxy, hydroxyalkoxy, hydroxyalkyl, mercapto, mercaptoalkoxy, mercaptoalkyl, methylenedioxy, nitro, RfRgN—, RfRgNalkyl, RfRgNcarbonyl and RfRgNsulfonyl, wherein Rf and Rg are members independently selected from the group consisting of hydrogen, alkyl, alkoxyalkyl, alkylcarbonyl, alkylsulfonyl, alkoxycarbonyl, cycloalkyl, cycloalkylalkyl, cycloalkylcarbonyl and cycloalkylsulfonyl.
The term “arylalkyl,” as used herein, refers to an aryl group, as defined herein, appended to the parent molecular moiety through an alkyl group, as defined herein. Representative examples of arylalkyl include, but are not limited to, benzyl, 2-phenylethyl, 3-phenylpropyl, and 2-naphth-2-ylethyl.
The term “aryl-heterocycle,” as used herein, refers to an aryl group, as defined herein, appended to the parent molecular moiety through a heterocycle group, as defined herein.
The term “aryl-NH—,” as used herein, refers to an aryl group, as defined herein, appended to the parent molecular moiety through a nitrogen atom.
The term “aryl-NH-alkyl,” as used herein, refers to an aryl-NH— group, as defined herein, appended to the parent molecular moiety through an alkyl group, as defined herein.
The term “aryloxy,” as used herein, refers to an aryl group, as defined herein, appended to the parent molecular moiety through an oxy moiety, as defined herein. Representative examples of aryloxy include, but are not limited to phenoxy, naphthyloxy, 3-bromophenoxy, 4-chlorophenoxy, 4-methylphenoxy, and 3,5-dimethoxyphenoxy.
The term “aryloxyalkyl,” as used herein, refers to an aryloxy group, as defined herein, appended to the parent molecular moiety through an alkyl group, as defined herein.
The term “arylsulfonyl,” as used herein, refers to an aryl group, as defined herein, appended to the parent molecular moiety through a sulfonyl group, as defined herein. Representative examples of arylsulfonyl include, but are not limited to, phenylsulfonyl, 4-bromophenylsulfonyl and naphthylsulfonyl.
The term “carbonyl,” as used herein refers to a —C(O)— group.
The term “carboxy,” as used herein refers to a —C(O)—OH group.
The term “carboxyalkyl,” as used herein refers to a carboxy group as defined herein, appended to the parent molecular moiety through an alkyl group as defined herein.
The term “carboxycycloalkyl,” as used herein refers to a carboxy group as defined herein, appended to the parent molecular moiety through an cycloalkyl group as defined herein.
The term “cycloalkyl,” as used herein, refers to a saturated cyclic hydrocarbon group containing from 3 to 8 carbons. Examples of cycloalkyl include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, and cyclooctyl.
The cycloalkyl groups of this invention may be substituted with 1, 2, 3, 4 or 5 substituents independently selected from alkenyl, alkenylthio, alkenyloxy, alkoxy, alkoxyalkoxy, alkoxyalkoxyalkoxy, alkoxyalkoxyalkyl, alkoxyalkyl, alkoxycarbonyl, alkoxycarbonylalkoxy, alkoxycarbonylalkyl, alkoxysulfonyl, alkyl, alkylcarbonyl, alkylcarbonylalkoxy, alkylcarbonylalkyl, alkylcarbonylalkylthio, alkylcarbonyloxy, alkylcarbonylthio, alkylsulfinyl, alkylsulfinylalkyl, alkyl sulfonyl, alkylsulfonylalkyl, alkylthio, alkylthioalkyl, alkylthioalkoxy, alkynyl, alkynyloxy, alkynylthio, carboxy, carboxyalkoxy, carboxyalkyl, cyano, cyanoalkoxy, cyanoalkyl, cyanoalkylthio, formyl, formylalkoxy, formylalkyl, haloalkenyl, haloalkenyloxy, haloalkoxy, haloalkyl, haloalkynyl, haloalkynyloxy, halogen, hydroxy, hydroxyalkoxy, hydroxyalkyl, mercapto, mercaptoalkoxy, mercaptoalkyl, nitro, RfRgN—, RfRgNalkyl, RfRgNcarbonyl and RfRgNsulfonyl, wherein Rf and Rg are members independently selected from the group consisting of hydrogen, alkyl, alkoxyalkyl, alkylcarbonyl, alkylsulfonyl, alkoxycarbonyl, cycloalkyl, cycloalkylalkyl, cycloalkylcarbonyl and cycloalkylsulfonyl.
The term “cycloalkylsulfonyl,” as used herein, refers to cycloalkyl group, as defined herein, appended to the parent molecular moiety through a sulfonyl group, as defined herein. Representative examples of cycloalkylsulfonyl include, but are not limited to, cyclohexylsulfonyl and cyclobutylsulfonyl.
The term “halo“ or “halogen,” as used herein, refers to —Cl, —Br, —I or —F.
The term “haloalkyl,” as used herein, refers to at least one halogen, as defined herein, appended to the parent molecular moiety through an alkyl group, as defined herein. Representative examples of haloalkyl include, but are not limited to, chloromethyl, 2-fluoroethyl, trifluoromethyl, pentafluoroethyl, and 2-chloro-3-fluoropentyl.
The term “heterocycle” or “heterocyclic,” as used herein, refers to a monocyclic or bicyclic ring system. Monocyclic ring systems are exemplified by any 3- or 4-membered ring containing a heteroatom independently selected from oxygen, nitrogen and sulfur, or a 5-, 6- or 7-membered ring containing one, two or three heteroatoms wherein the heteroatoms are independently members selected from nitrogen, oxygen and sulfur. The 5-membered ring has from 0-2 double bonds and the 6- and 7-membered rings have from 0-3 double bonds. Representative examples of monocyclic ring systems include, but are not limited to, azetidinyl, azepinyl, aziridinyl, diazepinyl, 1,5-diazocanyl, 4,10-diazabicyclo[5.2.1]decane, 3,7-diazabicyclo[3.3.1]nonane, 1,3-dioxolanyl, dioxanyl, dithianyl, furyl, imidazolyl, imidazolinyl, imidazolidinyl, isothiazolyl, isothiazolinyl, isothiazolidinyl, isoxazolyl, isoxazolinyl, isoxazolidinyl, morpholinyl, oxadiazolyl, oxadiazolinyl, oxadiazolidinyl, oxazolyl, oxazolinyl, oxazolidinyl, piperazinyl, piperidinyl, pyranyl, pyrazinyl, pyrazolyl, pyrazolinyl, pyrazolidinyl, pyridyl, pyrimidinyl, pyridazinyl, pyrrolyl, pyrrolinyl, pyrrolidinyl, tetrahydrofuranyl, tetrahydrothienyl, tetrazinyl, tetrazolyl, thiadiazolyl, thiadiazolinyl, thiadiazolidinyl, thiazolyl, thiazolinyl, thiazolidinyl, thienyl, thiomorpholinyl, 1,1-dioxidothiomorpholinyl(thiomorpholine sulfone), thiopyranyl, triazinyl, triazolyl, and trithianyl. Bicyclic ring systems are exemplified by any of the above monocyclic ring systems fused to an aryl group as defined herein, a cycloalkyl group as defined herein, or another heterocyclic monocyclic ring system. Representative examples of bicyclic ring systems include but are not limited to, for example, benzimidazolyl, benzoazepine, benzothiazolyl, benzothienyl, benzoxazolyl, benzofuranyl, benzopyranyl, benzothiopyranyl, benzodioxinyl, 1,3-benzodioxolyl, cinnolinyl, indazolyl, indolyl, indolinyl, indolizinyl, naphthyridinyl, isobenzofuranyl, isobenzothienyl, isoindolyl, isoindolinyl, isoquinolinyl, phthalazinyl, pyranopyridyl, quinolinyl, quinolizinyl, quinoxalinyl, quinazolinyl, 2,3,4,5-tetrahydro-1H-benzo[c]azepine, 2,3,4,5-tetrahydro-1H-benzo[b]azepine, 2,3,4,5-tetrahydro-1H-benzo[d]azepine, tetrahydroisoquinolinyl, tetrahydroquinolinyl, and thiopyranopyridyl.
The heterocycles of this invention may be optionally substituted with 0, 1, 2 or 3 substituents independently selected from alkenyl, alkenylthio, alkenyloxy, alkoxy, alkoxyalkoxy, alkoxyalkoxyalkoxy, alkoxyalkoxyalkyl, alkoxyalkyl, alkoxycarbonyl, alkoxycarbonylalkoxy, alkoxycarbonylalkyl, alkoxysulfonyl, alkyl, alkylcarbonyl, alkylcarbonylalkoxy, alkylcarbonylalkyl, alkylcarbonylalkylthio, alkylcarbonyloxy, alkylcarbonylthio, alkylsulfinyl, alkylsulfinylalkyl, alkyl sulfonyl, alkylsulfonylalkyl, alkylthio, alkylthioalkyl, alkylthioalkoxy, alkynyl, alkynyloxy, alkynylthio, aryl, arylcarbonyl, aryloxy, arylsulfonyl, carboxy, carboxyalkoxy, carboxyalkyl, cyano, cyanoalkoxy, cyanoalkyl, cyanoalkylthio, ethylenedioxy, formyl, formylalkoxy, formylalkyl, haloalkenyl, haloalkenyloxy, haloalkoxy, haloalkyl, haloalkynyl, haloalkynyloxy, halogen, heterocycle, heterocyclecarbonyl, heterocycleoxy, heterocyclesulfonyl, hydroxy, hydroxyalkoxy, hydroxyalkyl, mercapto, mercaptoalkoxy, mercaptoalkyl, methylenedioxy, oxo, nitro, RfRgN—, RfRgNalkyl, RfRgNcarbonyl and RfRgNsulfonyl, wherein Rf and Rg are members independently selected from the group consisting of hydrogen, alkyl, alkoxyalkyl, alkylcarbonyl, alkylsulfonyl, alkoxycarbonyl, cycloalkyl, cycloalkylalkyl, cycloalkylcarbonyl and cycloalkylsulfonyl.
The term “heterocyclealkyl,” as used herein, refers to a heterocycle, as defined herein, appended to the parent molecular moiety through an alkyl group, as defined herein. Representative examples of heterocyclealkyl include, but are not limited to, pyridin-3-ylmethyl and 2-pyrimidin-2-ylpropyl.
The term “heterocyclealkoxy,” as used herein, refers to a heterocycle, as defined herein, appended to the parent molecular moiety through an alkoxy group, as defined herein.
The term “heterocycleoxy,” as used herein, refers to a heterocycle, as defined herein, appended to the parent molecular moiety through an oxy group, as defined herein.
The term “heterocycleoxyalkyl,” as used herein, refers to a heterocycleoxy, as defined herein, appended to the parent molecular moiety through an alkyl group, as defined herein.
The term “heterocycle-NH—,” as used herein, refers to a heterocycle, as defined herein, appended to the parent molecular moiety through a nitrogen atom.
The term “heterocycle-NH-alkyl,” as used herein, refers to a heterocycle-NH—, as defined herein, appended to the parent molecular moiety through an alkyl group, as defined herein.
The term “heterocycle-heterocycle,” as used herein, refers to a heterocycle, as defined herein, appended to the parent molecular moiety through a heterocycle group, as defined herein.
The term “heterocyclesulfonyl,” as used herein, refers to a heterocycle, as defined herein, appended to the parent molecular moiety through a sulfonyl group, as defined herein. Representative examples of heterocyclesulfonyl include, but are not limited to, 1-piperidinylsulfonyl, 4-morpholinylsulfonyl, pyridin-3-ylsulfonyl and quinolin-3-ylsulfonyl.
The term “non-aromatic,” as used herein, refers to a monocyclic or bicyclic ring system that does not contain the appropriate number of double bonds to satisfy the rule for aromaticity. Representative examples of a “non-aromatic” heterocycles include, but not limited to, piperidinyl, piperazinyl, homopiperazinyl, and pyrrolidinyl. Representative bicyclic ring systems are exemplified by any of the above monocyclic ring systems fused to an aryl group as defined herein, a cycloalkyl group as defined herein, or another heterocyclic monocyclic ring system.
The term “oxo,” as used herein, refers to a ═O group appended to the parent molecule through an available carbon atom.
The term “oxy,” as used herein, refers to a —O— group.
The term “sulfonyl,” as used herein, refers to a —S(O)2— group.
Salts
The present compounds may exist as therapeutically suitable salts. The term “therapeutically suitable salt,” refers to salts or zwitterions of the compounds which are water or oil-soluble or dispersible, suitable for treatment of disorders without undue toxicity, irritation, and allergic response, commensurate with a reasonable benefit/risk ratio, and effective for their intended use. The salts may be prepared during the final isolation and purification of the compounds or separately by reacting an amino group of the compounds with a suitable acid. For example, a compound may be dissolved in a suitable solvent such as, but not limited to, methanol and water and treated with at least one equivalent of an acid, like hydrochloric acid. The resulting salt may precipitate out and be isolated by filtration and dried under reduced pressure. Alternatively, the solvent and excess acid may be removed under reduced pressure to provide the salt.
Representative salts include acetate, adipate, alginate, citrate, aspartate, benzoate, benzenesulfonate, bisulfate, butyrate, camphorate, camphorsulfonate, digluconate, glycerophosphate, hemisulfate, heptanoate, hexanoate, formate, isethionate, fumarate, lactate, maleate, methanesulfonate, naphthylenesulfonate, nicotinate, oxalate, pamoate, pectinate, persulfate, 3-phenylpropionate, picrate, oxalate, maleate, pivalate, propionate, succinate, tartrate, trichloroacetate, trifluoroacetate, glutamate, para-toluenesulfonate, undecanoate, hydrochloric, hydrobromic, sulfuric, phosphoric, and the like. The amino groups of the compounds may also be quaternized with alkyl chlorides, bromides, and iodides such as methyl, ethyl, propyl, isopropyl, butyl, lauryl, myristyl, stearyl, and the like. The present invention also includes pharmaceutically acceptable salts of any compounds of formulas I thru X. In general, salt formation (during the purification of the compounds) is taught in the procedure outlined in Example 8.
Basic addition salts may be prepared during the final isolation and purification of the present compounds by reaction of a carboxyl group with a suitable base such as the hydroxide, carbonate, or bicarbonate of a metal cation such as lithium, sodium, potassium, calcium, magnesium, or aluminum, or an organic primary, secondary, or tertiary amine. Quaternary amine salts derived from methylamine, dimethylamine, trimethylamine, triethylamine, diethylamine, ethylamine, tributylamine, pyridine, N,N-dimethylaniline, N-methylpiperidine, N-methylmorpholine, dicyclohexylamine, procaine, dibenzylamine, N,N-dibenzylphenethylamine, 1-ephenaamine, and N,N′-dibenzylethylenediamine, ethylenediamine, ethanolamine, diethanolamine, piperidine, piperazine, and the like, are contemplated as being within the scope of the present invention.
Prodrugs
The present compounds may also exist as therapeutically suitable prodrugs. The term “therapeutically suitable prodrug,” refers to those prodrugs or zwitterions which are suitable for use in contact with the tissues of patients without undue toxicity, irritation, and allergic response, are commensurate with a reasonable benefit/risk ratio, and are effective for their intended use. The term “prodrug,” refers to compounds that are rapidly transformed in vivo to the parent compounds of formula (I-X) for example, by hydrolysis in blood. The term “prodrug,” refers to compounds that contain, but are not limited to, substituents known as “therapeutically suitable esters.” The term “therapeutically suitable ester,” refers to alkoxycarbonyl groups appended to the parent molecule on an available carbon atom. More specifically, a “therapeutically suitable ester,” refers to alkoxycarbonyl groups appended to the parent molecule on one or more available aryl, cycloalkyl and/or heterocycle groups as defined herein. Compounds containing therapeutically suitable esters are an example, but are not intended to limit the scope of compounds considered to be prodrugs. Examples of prodrug ester groups include pivaloyloxymethyl, acetoxymethyl, phthalidyl, indanyl and methoxymethyl, as well as other such groups known in the art. Other examples of prodrug ester groups are found in T. Higuchi and V. Stella, Pro-drugs as Novel Delivery Systems, Vol. 14 of the A.C.S. Symposium Series, and in Edward B. Roche, ed., Bioreversible Carriers in Drug Design, American Pharmaceutical Association and Pergamon Press, 1987, both of which are incorporated herein by reference. Potential prodrug sites include “therapeutically suitable esters” at the carboxyl group of Example 8 (i.e., alkoxycarbonyl groups in the place of the carboxyl group).
Optical Isomers-Diastereomers-Geometric Isomers
Asymmetric centers may exist in the present compounds. Individual stereoisomers of the compounds are prepared by synthesis from chiral starting materials or by preparation of racemic mixtures and separation by conversion to a mixture of diastereomers followed by separation or recrystallization, chromatographic techniques, or direct separation of the enantiomers on chiral chromatographic columns. Starting materials of particular stereochemistry are either commercially available or are made by the methods described hereinbelow and resolved by techniques well-known in the art.
Geometric isomers may exist in the present compounds. The invention contemplates the various geometric isomers and mixtures thereof resulting from the disposal of substituents around a carbon-carbon double bond, a cycloalkyl group, or a heterocycloalkyl group. Substituents around a carbon-carbon double bond are designated as being of Z or E configuration and substituents around a cycloalkyl or heterocycloalkyl are designated as being of cis or trans configuration.
The compounds and processes of the present invention will be better understood in connection with the following synthetic schemes and Experimentals that illustrate a means by which the compounds of the invention may be prepared.
The compounds of this invention may be prepared by a variety of procedures and synthetic routes. Representative procedures and synthetic routes are shown in, but are not limited to, Schemes 1-3.
Abbreviations which have been used in the descriptions of the Schemes and the Examples that follow are: DCM for dichloromethane; DMAP for dimethylaminopyridine; DMF for N,N-dimethylformamide; DMSO for dimethylsulfoxide; DAST for (diethylamino)sulfur trifluoride; DIPEA or Hunig's base for diusopropylethylamine; DMA for dimethylacetamide; EDCI for (3-dimethylaminopropyl)-3-ethylcarbodiimide HCl; EtOAc for ethyl acetate; EtOH for ethanol; HATU for O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluoro-phosphate; HOAc for acetic acid; HOBt for hydroxybenzotriazole hydrate; MeOH for methanol; mesyl for methanesulfonyl; TEA for triethylamine; TFA for trifluoroacetic acid; THF for tetrahydrofuran; tosyl for para-toluenesulfonyl; triflate for trifluoromethanesulfonyl.
Adamantanes of general formula (5), wherein R1, R2, R3, R4, and R5 are as defined in formula I, may be prepared as in Scheme 1. 2-adamantamine and related amines of general formula (1) may be purchased or prepared by methods known to those in the art. For instance 2-adamantamine may undergo reductive amination with an aldehyde or ketone. Amines of general formula (1) may be treated with acylating agents such as chloroacetyl chloride or 2-bromopropionyl bromide of general formula (2), wherein X is Cl, Br, or F, R3 and R4 are defined as in formula I, and Y is a leaving group like Cl or Br (or a protected or masked leaving group), and a base such as diisopropylethylamine to provide amides of general formula (3). Alternatively, acids of general formula (2), wherein X is OH, may be coupled to an amine of general formula (1) like 2-adamantamine with reagents such as EDCI and HOBt to provide amides of general formula (3). When Y is a leaving group like chlorine or bromine, Y equals Z. When Y is a protected or masked leaving group, Y is converted into Z where Z is a leaving group like Cl, Br, I, —O-tosyl, —O-mesyl, or —O-triflate after amide formation. Amides of general formula (3) may be treated with amines of general formula (4) wherein R1 and R2 are as defined in formula I to provide aminoamides of general formula (5).
Adamantanes of general formula (8), wherein R1, R2, R3, R4, and R5 are as defined in formula I, may be prepared as in Scheme 2. 2-adamantamine and related amines of general formula (1) may be purchased or prepared by methods known to those in the art. For instance 2-adamantamine may undergo reductive amination with an aldehyde or ketone. Amines of general formula (1) may be coupled with protected amino acids of general formula (6), wherein X is OH, R3 and R4 are defined as in formula I, and Y is a protected or masked amine, such as N-(tert-butoxycarbonyl)glycine with reagents such as EDCI and HOBt to provide amides of general formula (7) after deprotection. Alternatively, amines of general formula (1) may be treated with activated protected amino acids of general formula (6), wherein X is Cl, Br, or F, and a base such as diisopropylethylamine to provide amides of general formula (7) after deprotection. Amides of general formula (7) may be treated with alkylating agents such as 1,5-dibromopentane and a base like potassium carbonate to yield amides of general formula (8). Among other methods known to those in the art, amides of general formula (7) may be treated with aldehydes such as benzaldehyde and a reducing agent like sodium cyanoborohydride to yield amides of general formula (8).
Adamantanes of general formula (15), wherein R1, R2, R3, R4, and R5 are as defined in formula I, may be prepared as in Scheme 3. Amines of general formula (11) may be purchased or prepared using methodology known to those in the art. The amines of general formula (11) may be reacted with reagents of general formula (12), wherein R3 and R4 are defined as in formula I, Y is a leaving group such as Cl, Br, I, —O-tosyl, —O-mesyl, or —O-triflate, and X is an alkoxy group, such as 2-bromopropionic acid methyl ester in the presence of a base like diisopropylethylamine to provide esters of general formula (13). Esters of general formula (13) may be alkylated using a base like lithium diisopropylamide and an alkylating agent such as methyl iodide to yield acids of general formula (14), X═OH, after hydrolysis. Amines of general formula (1) may be coupled to acids of general formula (14) with reagents such as EDCI and HOBt to provide amides of general formula (15).
The compounds and processes of the present invention will be better understood by reference to the following Examples, which are intended as an illustration of and not a limitation upon the scope of the invention. Further, all citations herein are incorporated by reference.
Compounds of the invention were named by ACD/ChemSketch version 5.01 (developed by Advanced Chemistry Development, Inc., Toronto, ON, Canada) or were given names consistent with ACD nomenclature.
A solution of 2-adamantamine hydrochloride (1.8 g, 9.6 mmoles) and diisopropylethylamine (DIPEA) (3.48 mL, 20 mmoles) in DCM (30 mL) was cooled in an ice bath and treated with chloroacetyl chloride (0.78 mL, 9.65 mmoles). The solution was stirred for 2 hours at room temperature and the DCM was removed under reduced pressure. The residue was partitioned between water and ethyl acetate. The organic layer was washed with saturated sodium bicarbonate and with water, dried over MgSO4 and filtered. The filtrate was concentrated under reduced pressure to provide the title compound as a dark tan solid (2.1 g, 92.5%).
N-Adamantan-2-yl-2-chloro-acetamide (5.2 g, 22.8 mmoles) from Example 1A, piperazine-1-carboxylic acid tert-butyl ester (5.32 g, 28.5 mmoles), and triethylamine (4.0 mL, 28.5 mmoles) were added to a room temperature solution of CH3CN (23 mL) and THF (23 mL). After stirring for 48 h the reaction was concentrated and chromatographed on silica gel (4:1→1:4 hexane:EtOAc) to provide the title compound (5.44 g, 63%).
4-(Adamantan-2-ylcarbamoylmethyl)-piperazine-1-carboxylic acid tert-butyl ester (5.4 g, 14.3 mmoles) from Example 1B was dissolved in CH2Cl2 (34 mL) and TFA (7 mL) and stirred at room temperature for 4 hours. The mixture was concentrated in vacuo, toluene (50 mL) was added, and the resulting mixture concentrated in vacuo again to provide a crude sample of the bis(trifluoroacetic acid) salt of the title compound.
A solution of the bis(trifluoroacetic acid) salt of N-adamantan-2-yl-2-piperazin-1-yl-acetamide (51 mg, 0.1 mmoles), from Example 1C, in dimethylsulfoxide (DMSO) (0.33 mL) and 2N aqueous sodium carbonate (0.2 mL) was treated with 2,5-dichloro-pyridine (30 mg, 0.2 mmoles) and irradiated by microwaves for 20 min at 240° C. The reaction mixture was filtered through a Celite cartridge and purified by HPLC to provide the title compound as a white solid (20 mg, 50%). 1H NMR (300 MHz, CDCl3) δ. 8.12. (d, J=2.5 Hz, 1H), 7.73 (d, J=8.8 Hz, 1H), 7.44 (dd, J=2.5 Hz, 9.2 Hz, 1H), 6.61 (d, J=9.2 Hz, 1H), 4.10 (d, J=8.9 Hz, 1H), 3.56 (t, J=5 Hz, 4H), 3.12 (s, 2H), 2.69 (t, J=5 Hz, 4H), 1.91 (s, 2H), 1.87 (d, J=1.9 Hz, 6H), 1.75 (m, 4H), 1.67 (m, 2H); MS (APCI+) m/z 389 (M+H)+.
A solution of 2-adamantamine hydrochloride (1.87 g, 10 mmoles) in DCM (30 mL) and DIPEA (4.16 mL, 24 mmoles) was cooled in an ice bath and treated with 2-chloropropionyl chloride (0.93 mL, 11 mmoles). The solution was stirred for 2 hours at room temperature and DCM was removed under reduced pressure. The residue was partitioned between water and ethyl acetate. The organic layer was washed with saturated sodium bicarbonate and with water, dried over MgSO4 and filtered. The filtrate was concentrated under reduced pressure to provide the title compound as a dark tan solid (2.2 g, 92.3%).
A solution of 2-chloro-N-adamantan-2-yl-propionamide (2.4 g, 10 mmoles), from Example 2A, in dimethylformamide (DMF) (33 mL) and 2N aqueous sodium carbonate (15 mL) was treated with Boc-piperazine (1.86 g, 10 mmoles). The solution was stirred overnight at 60° C. and DMF was removed under reduced pressure. The residue was partitioned between water and ethyl acetate. The organic layer was washed twice with water, dried over MgSO4 and filtered. The filtrate was concentrated under reduced pressure to provide the title compound as a white solid (2.9 g, 74.3%).
4-[1-(Adamantan-2-ylcarbamoyl)-ethyl]-piperazine-1-carboxylic acid tert-butyl ester (2.9 g, 7.4 mmoles), from Example 2B, was dissolved in a 4N HCl solution in dioxane (50 mL). The resulting solution was stirred for 4 hours at room temperature. Dioxane was removed under reduced pressure to provide a bis(hydrochloride) salt of the title compound as a white solid (2.4 g, 99%)
A solution of the bis(hydrochloride) salt of N-adamantan-2-yl-2-piperazin-1-yl-propionamide (37 mg, 0.1 mmoles), from Example 2C, in dimethylsulfoxide (DMSO) (0.33 mL) and 2N aqueous sodium carbonate (0.2 mL) was treated with 2,5-dichloro-pyridine (30 mg, 0.2 mmoles) and irradiated by microwaves for 20 min at 240° C. The reaction mixture was filtered through a Celite cartridge and purified by HPLC to provide the title compound as a white solid (20 mg, 50%). 1H NMR (300 MHz, CDCl3) δ. 8.12. (d, J=2.8 Hz, 1H), 7.76 (d, J=8.5 Hz, 1H), 7.44 (dd, J=2.5, 9.2 Hz, 1H), 6.61 (d, J=9.2 Hz, 1H), 4.05 (d, J=8.5 Hz, 1H, ), 3.54 (s, 4H), 3.12 (d, J=6.5 Hz, 1H), 2.68 (m, 4H), 1.89 (m, 8H), 1.75 (s, 4H), 1.67(m, 2H), 1.28 (d, J=6.7 Hz, 3H); MS (APCI+) m/z 403 (M+H)+.
Library synthesis was performed using a PE Biosystems (Applied Biosystems) Solaris 530 organic synthesizer. All monomers used in the automated synthesis were stored under inert atmosphere and supplied as either oils or solids in capped 4 mL Kimble vials (Kimble 6088 1A-1545) from Aldrich Chemical Co. Other reagents were used directly as obtained from the manufacturer. Each of the 48 round bottom flasks was charged with 3 equivalents of PS—BH3CN resin (Argonaut Technologies). The reaction block was then assembled, placed on the Solaris 530 and purged with nitrogen for 45 seconds. The alcohol monomers (0.6 mmoles) were each dissolved in 3 mL of DMA and the HOAc and amine core were each dissolved in 17 and 10 mL of 50/50 MeOH/DCM, respectively, and placed on the instrument. To the monomer solutions was added 0.5 mmoles of Dess-Martin periodinane reagent (Aldrich Chemical Co.). The monomer/Dess-Martin periodinane solution was shaken at room temperature for 30 minutes. The Solaris was then primed with MeOH and into each of the 48 flasks containing PS—BH3CN resin was added 0.75 mL of the core solution (1 eq.) followed by 0.75 mL of HOAc solution (1 eq) and 1.5 eq of each monomer solution. The reactions were heated to 55° C. overnight, checked by LC/MS to confirm that the transformations were complete, filtered and transferred to 20 mL vials containing 3 eq. of MP-Carbonate and 2 eq. of PS-TsNHNH2 (Argonaut Technologies) resin. The reaction vessels and PS—BH3CN resin were washed with MeOH and the combined filtrates were shaken over the MP-carbonate/PS-TsNHNH2 resins for 2 hours at room temperature. The MP-Carbonate/PS-TsNHNH2 resins were removed via filtration and the reactions were concentrated to dryness. The residues were dissolved in 1:1 DMSO/MeOH (1.2 mL) and purified by reverse-phase HPLC. The monomer in this case was 2-benzyloxy-ethanol and the core was the product of Example 1C. 1H NMR (500 MHz, pyridine-d5) δ ppm 1.59 (d, J=12.2 Hz, 2 H) 1.65 (s, 2 H) 1.74 (m, 7 H) 1.89 (d, J=12.8 Hz, 2 H) 1.98 (m, J=4.7 Hz, 2 H) 2.59 (m, 7 H) 2.66 (t, J=5.9 Hz, 2 H) 3.16 (s, 2 H) 3.65 (m, 2 H) 4.29 (m, 1 H) 4.56 (s, 2 H) 7.31 (t, J=7.95 Hz, 1 H) 7.39 (m, J=7.49, 7.5 Hz, 3 H) 7.47 (d, J=6.9 Hz, 2 H); MS (ESI) positive ion 412.1 (M+H)+.
A solution of 2-chloro-N-adamantan-2-yl-propionamide (48 mg, 0.2 mmoles), from Example 2A, in dimethylformamide (DMF) (0.5 mL) and 2N aqueous sodium carbonate (0.1 mL) was treated with furan-2-yl-piperazin-1-yl-methanone. The solution was stirred overnight at 70° C. and DMF was removed under reduced pressure. The residue was partitioned between water and ethyl acetate. The organic layer was washed twice with water, dried over MgSO4 and filtered. The filtrate was concentrated under reduced pressure and purified by HPLC to provide the title compound as a white solid (43 mg, 56%). 1H NMR (300 MHz, CDCl3) δ. 7.67 (d, J=8.5 Hz, 1H), 7.48 (s, 1H), 7.01 (d, J=3.4 Hz, 1H), 6.48 (q, J=1.5,3.4 Hz, 1H), 4.05 (d, J=8.7 Hz, 1H), 3.84 (s, 4H), 3.12(q, J=7.2 Hz, 1H), 2.63 (m, 4H), 1.9-1.86 (m, 8H), 1.76-1.68 (m, 6H), 1.26 (d, 7.2, 3H), ;MS (APCI+) m/z 386 (M+H)+.
1-(Benzyloxycarbonyl)-piperidine-2-carboxylic acid [M. J. Genin, W. B. Gleason, R. L. Johnson J. Org. Chem. 1993, 58 (4), 860-866], (5.26 g., 0.02 mol) and diisopropyethylamine (3.10 g, 0.024 mol) were dissolved in 35 mL. dichloromethane. 1-Hydroxybenzotriazole (3.366 g., 0.022 mol) was added. When all of the solids dissolved, 2-amino-adamantane HCl (4.50 g., 0.024 mol) was added. Finally, EDCI.HCl (4.60 g., 0.024 mol) was added. After stirring 10 minutes, a clear solution was observed. After stirring 18 hours at room temperature, the solution was concentrated under reduced pressure and toluene was added. The organic phase was washed with aqueous Na2CO3, water, dilute HCl, and then aqueous KHCO3. After drying over Na2SO4, the solvents were removed in vacuum to yield the title compound (6.65 g, 84% yield). TLC in ethyl acetate was one spot, Rf=0.65.
The product of Example 7A (6.55 g., 16.52 mmoles) was dissolved in methanol (125 mL). 10% Pd on carbon (665 mg.) was added and the mixture was hydrogenated with 4 atmospheres H2 at room temperature for 1 hour. The catalyst was removed by filtration, and the solution concentrated under reduced pressure. Heptane was added and removed under reduced pressure (3 times). The residue was crystallized from ether and heptane (1:3) to provide the title compound (4.33 g, 100%, mp 112-114° C.).
The product of Example 7B (263 mg., 1.0 mm.) and diisopropylethylamine (387 mg, 3.0 mmoles) were dissolved in DMF (1.5 mL). 2-(Chloromethyl)-pyridine HCl (175 mg, 1.067 mmoles) was added. The mixture was stirred for 5 hours at room temperature. Toluene and aqueous KHCO3 were added and shaken. The toluene phase was dried (Na2SO4) and the solution concentrated under reduced pressure. The residue was chromatographed on silica gel, eluting with 5% methanol in dichloromethane to yield the title compound (211 mg, mp 126-127° C.). NMR(300 MHz, CDCl3) 1.15-1.20 (m, 1H), 1.22-1.98 (m, 19H), 2.03-2.17 (m,2H), 2.85-2.95 (m, 2H), 3.35 (d, J=13 Hz, 1H), 4.01 (d, J=13 Hz, 1H), 4.15 (s, 1H), 7.15 (dd, J=4 Hz, J=2 Hz, 1H), 7.24 (d, J=7 Hz), 1H), 7.63 (dt, J=7 Hz, J=2 Hz, 1H), 7.68 (s, 1H), 8.55 (dd, J=4 Hz, J=1 Hz, 1H).
A stirred solution of pyrrolidine-2-carboxylic acid adamantan-2-ylamide trifluoracetic acid salt (73 mg, 0.2 mmoles) from Example 6C, N,N-diisoproylethylamine (52 mg, 0.4 mmoles), 4-bromomethyl-benzoic acid (43 mg, 0.2 mmoles), dimethylsulfoxide (1.5 mL) and methanol (1.5 mL) was heated to 70° C. for 18 hours. The mixture was cooled to 23° C. and purified by preparative HPLC on a Waters Symmetry C8 column (40mm×100 mm, 7 μm particle size) using a gradient of 10% to 100% acetonitrile: 0.1% aqueous TFA over 12 min (15 min run time) at a flow rate of 70 mL/min to afford the trifluoroacetic acid salt of the title compound (51.6 mg,51%) upon concentration in vacuo. 1H NMR (300 MHz, DMSO-d6) δ. 13.10 (bs, 1H), 9.66 (bs, 1H), 8.15 (m, 1H), 7.93 (d, J=8.4 Hz, 2H), 7.58 (d, J=8.1 Hz, 2H), 4.48 (m, 1H),4.38 (m, 1H), 4.19 (m, 1H), 3.61 (m, 1H), 2.07 (m, 1H), 1.70 (m, 16H), 1.27 (m, 3H); MS (DCI) m/z 383 (M+H)+.
A 0° C. heterogenous solution of 4-[2-(adamantan-2-ylcarbamoyl)-pyrrolidin-1-ylmethyl]-benzoic acid (50 mg, 0.13 mmoles) from Example 8 and CH2Cl2 (6 mL) was treated with oxalyl chloride (20 mg, 0.16 mmoles) and catalytic N,N-dimethylformamide. The reaction mixture was slowly warmed to 23° C. and remained heterogeneous even after 2 hours. To the reaction mixture was added tetrahydrofuran (4 mL) and thionyl chloride (0.5 mL), and the reaction temperature raised to reflux for 30 minutes. The reaction mixture was cooled to 23° C., concentrated under reduced pressure, and re-dissolved in tetrahydrofuran (1 mL). To this stirred reaction mixture at 23° C. was added 0.5 M NH3 in dioxane (1.05 mL, 0.55 mmoles) followed after 30 min by H2O (0.25 mL). After another 30 min, the reaction mixture was concentrated under reduced pressure and purified by preparative HPLC on a Waters Symmetry C8 column (40 mm×10 0 mm, 7 μm particle size) using a gradient of 10% to 100% acetonitrile: ammonium acetate (10 mM) over 12 minutes (15 minute run time) at a flow rate of 70 mL/min to afford the title compound (11 mg, 22%). 1H NMR (300 MHz, DMSO-d6) δ. 7.92 (bs, 1H), 7.83 (d, J=8.1 Hz, 2H), 7.73 (d, J=8.4 Hz, 1H), 7.38 (d, J=8.1 Hz, 2H), 7.31 (bs, 1H), 3.86 (d, J=13.8 Hz, 1H), 3.77 (d, J=8.4 Hz, 1H), 3.59 (d, J=13.5 Hz, 1H), 3.16 (dd, J=4.8, 9.9 Hz, 1H), 2.98 (m, 1H), 2.36 (m, 1H), 2.10 (m, 1H), 1.72 (m, 15H), 1.54 (m, 2H); MS (DCI) m/z 382 (M+H)+.
A solution of 1-(5-trifluoromethyl-pyridin-2-yl)-piperazine (0.9 g, 3.9 mmoles) in MeOH (13 mL) and DIPEA (1.5 mL) was treated with 2-bromo-propionic acid methyl ester (0.48 mL, 4.3 mmoles) and stirred overnight at 70° C. MeOH was removed under reduced pressure and the residue was purified (silica gel, 10-40% acetone in hexane) to provide the title compound as a yellowish solid (1.23 g, 99%).
A solution of 2-[4-(5-trifluoromethyl-pyridin-2-yl)-piperazin-1-yl]-propionic acid methyl ester (1.23 g, 3.9 mmoles), from Example 11A, in dry THF (3 mL) was added dropwise to a −65° C. solution of 1.8 N lithium diisopropylamine (LDA) in dry THF (2.4 mL) and stirred at this temperature for 1 hour. Methyl iodide (0.49 mL, 7.88 mmoles) was then added to the reaction mixture. The reaction was allowed to slowly warm to room temperature and stir for 2 hours at room temperature. The reaction was quenched with ice/water and partitioned between water and ethyl acetate. The aqueous layer was extracted with ethyl acetate. The combined organic extracts were washed with water, dried over MgSO4, filtered and the filtrate concentrated under reduced pressure. The residue was purified (silica gel, 10-30% acetone in hexane) to provide the title compound as a yellowish solid (1.05 g, 81.7%)
A solution of 2-methyl-2-[4-(5-trifluoromethyl-pyridin-2-yl)-piperazin-1-yl]-propionic acid methyl ester (1.05 g, 3.17 mmoles), from Example 11B, in dioxane (10 mL) was treated with 5N aqueous potassium hydroxide (10 mL) and stirred for 4 hours at 60° C. Dioxane was removed under reduced pressure, the residue neutralized with 1N HCl to pH=7 and extracted three times with 4:1 THF:DCM. The combined organic extracts were dried over MgSO4, filtered and the filtrate concentrated under reduced pressure to provide the title compound as a white solid (0.9 g, 90%)
A solution of 2-methyl-2-[4-(5-trifluoromethyl-pyridin-2-yl)-piperazin-1-yl]-propionic acid (159 mg, 0.5 mmoles), from Example 11C, in DCM (5 mL) and DIPEA (0.5 mL) was treated with hydroxybenzotriazole hydrate (HOBt) (84 mg, 0.6 mmoles), 2-adamantamine hydrochloride (112 mg, 0.6 mmoles) and 15 min later with (3-dimethylaminopropyl)-3-ethylcarbodiimide HCl (EDCI) (115 mg, 0.6 mmoles). The reaction mixture was stirred overnight at room temperature. DCM was removed under reduced pressure and the residue was partitioned between water and ethyl acetate. The aqueous layer was extracted with ethyl acetate. The combined organic extracts were washed with saturated aqueous sodium bicarbonate and water, dried over MgSO4 and filtered. The filtrate was concentrated under reduced pressure and the crude product purified (silica gel, 10-40% acetone in hexane) to provide the title compound as a white solid (160 mg, 69%). 1H NMR (300 MHz, CDCl3) δ. 8.41 (s, 1H), 7.79 (d, J=6.5 Hz, 1H), 7.65 (m, 1H), 6.66 (d, J=9.2 Hz, 1H), 4.02 (d, J=6.8 Hz, 1H), 3.66 (m, 4H), 2.65 (t, J=5.1 Hz, 4H),1.9-1.86 (m, 8H), 1.75-1.69 (m, 6H), 1.24 (s, 6H); MS(APCI+) m/z 451 (M+H)+.
Measurement of Inhibition Constants:
The ability of test compounds to inhibit human 11-βHSD-1 enzymatic activity in vitro was evaluated in a Scintillation Proximity Assay (SPA). Tritiated-cortisone substrate, NADPH cofactor and titrated compound were incubated with truncated human 11β-HSD-1 enzyme (24-287AA) at room temperature to allow the conversion to cortisol to occur. The reaction was stopped by adding a non-specific 11β-HSD inhibitor, 18β-glycyrrhetinic acid. The tritiated cortisol generated was then captured by a mixture of an anti-cortisol monoclonal antibody and SPA beads coated with anti-mouse antibodies. The reaction plate was shaken at room temperature and the radioactivity bound to SPA beads was then measured on a β-scintillation counter. The 11-βHSD-1 assay was carried out in 96-well microtiter plates in a total volume of 220 μl. To start the assay, 188 μl of master mix which contains 17.5 nM 3H-cortisone, 157.5 nM cortisone, and 181 mM NADPH was added to the wells. In order to drive the reaction in the forward direction, 1 mM G-6-P was also added. Solid compound was dissolved in DMSO to make a 10 mM stock followed by a subsequent 10-fold dilution with 3% DMSO in Tris/EDTA buffer (pH 7.4). 22 μl of titrated compounds was then added in triplicate to the substrate. Reactions were initiated by the addition of 10 μl of 0.1 mg/ml E.coli lysates overexpressing 11β-HSD-1 enzyme. After shaking and incubating plates for 30 minutes at room temperature, reactions were stopped by adding 10 μl of 1 mM glycyrrhetinic acid. The product, tritiated cortisol, was captured by adding 10 μl of 1 μM monoclonal anti-cortisol antibodies and 100 μl SPA beads coated with anti-mouse antibodies. After shaking for 30 minutes, plates were read on a liquid scintillation counter Topcount. Percent inhibition was calculated based on the background and the maximal signal. Wells that contained substrate without compound or enzyme were used as the background, while the wells that contained substrate and enzyme without any compound were considered as maximal signal. Percent of inhibition of each compound was calculated relative to the maximal signal and IC50 curves were generated. This assay was applied to 11β-HSD-2 as well, whereby tritiated cortisol and NAD+ were used as substrate and cofactor, respectively.
As shown in Table 1, compounds of the present invention are active in the 11-βHSD-1 assay described above and show selectivity for human 11-β-HSD-1 over human 11-β-HSD-2.
The data in Table 1 indicates that the compounds of the present invention are active in the human 11β-HSD-1 enzymatic SPA assay described above and show selectivity for 11β-HSD-1 over 11β-HSD-2. The 11β-HSD-1 inhibitors generally have an inhibition constant IC50 of less than 600 nM, and more preferably less than 50 nM. Preferably, the compounds are selective and have an inhibition constant IC50 against 11β-HSD-2 greater than 1000 nM, and more preferably greater than 10,000 nM. Generally, the IC50 ratio for 11β-HSD-2 to 11β-HSD-1 of a compound is at least 10 or greater, and preferably 100 or greater.
Mouse Dehydrocorticosterone Challenge Model
Male CD-1 (18-22 g) mice (Charles River, Madison, Wis.) were group housed and allowed free access to food and water. Mice are brought into a quiet procedure room for acclimation the night before the study. Animals are dosed with vehicle or compound at various times (pretreatment period) before being challenged with 11-dehydrocorticosterone (Steraloids Inc., Newport, R.I.). Thirty minutes after challenge, the mice are euthanized with CO2 and blood samples (EDTA) are obtained by cardiac puncture and immediately placed on ice. Blood samples were then spun, the plasma was removed, and the samples frozen until further analysis was performed. Corticosterone levels were obtained by ELISA (American Laboratory Prod., Co., Windham, N.H.) or HPLC/mass spectroscopy.
ob/ob Mouse Model of Type 2 Diabetes
Male B6.VLepob(−/−) (ob/ob) mice and their lean littennates (Jackson Laboratory, Bar Harbor, Me.) were group housed and allowed free access to food (Purina 5015) and water. Mice were 6-7 weeks old at the start of each study. On day 0, animals were weighed and postprandial glucose levels determined (Medisense Precision-X™ glucometer, Abbott Laboratories). Mean postprandial glucose levels did not differ significantly from group to group (n=10) at the start of the studies. Animals were weighed, and postprandial glucose measurements were taken weekly throughout the study. On the last day of the study, 16 hours post dose (unless otherwise noted) the mice were euthanized via CO2, and blood samples (EDTA) were taken by cardiac puncture and immediately placed on ice. Whole blood measurements for HbA1c were taken with hand held meters (A1c NOW, Metrika Inc., Sunnyvale Calif.). Blood samples were then spun and plasma was removed and frozen until further analysis. The plasma triglyceride levels were determined according to instructions by the manufacturer (Infinity kit, Sigma Diagnostics, St. Louis Mo.).
The compounds are selective inhibitors of the 11β-HSD-1 enzyme. Their utility in treating or prophylactically treating type 2 diabetes, high blood pressure, dyslipidemia, obesity and other diseases and conditions is believed to derive from the biochemical mechanism described below.
Biochemical Mechanism
Glucocorticoids are steroid hormones that play an important role in regulating multiple physiological processes in a wide range of tissues and organs. For example, glucocorticoids are potent regulators of glucose and lipid metabolism. Excess glucocorticoid action may lead to insulin resistance, type 2 diabetes, dyslipidemia, visceral obesity and hypertension. Cortisol and cortisone are the major active and inactive forms of glucocorticoids in humans, respectively, while corticosterone and dehydrocorticosterone are the major active and inactive forms in rodents.
Previously, the main determinants of glucocorticoid action were thought to be the circulating hormone concentration and the density of receptors in the target tissues. In the last decade, it was discovered that tissue glucocorticoid levels may also be controlled by 11β-hydroxysteroid dehydrogenases enzymes (11β-HSDs). There are two 11β-HSD isozymes which have different substrate affinities and cofactors. The 11β-hydroxysteroid dehydrogenases type 1 enzyme (11β-HSD-1) is a low affinity enzyme with Km for cortisone in the micromolar range that prefers NADPH/NADP+ (nicotinamide adenine dinucleotide phosphate) as cofactors. 11β-HSD-1 is widely expressed and particularly high expression levels are found in liver, brain, lung, adipose tissue, and vascular smooth muscle cells. In vitro studies indicate that 11β-HSD-1 is capable of acting both as a reductase and a dehydrogenase. However, many studies have shown that it functions primarily as a reductase in vivo and in intact cells. It converts inactive 11-ketoglucocorticoids (i.e., cortisone or dehydrocorticosterone) to active 11-hydroxyglucocorticoids (i.e., cortisol or corticosterone), and thereby amplifies glucocorticoid action in a tissue-specific manner.
With only 20% homology to 11β-HSD-1, the 11β-hydroxysteroid dehydrogenases type 2 enzyme (11β-HSD-2) is a NAD+-dependent (nicotinamide adenine dinucleotide-dependent), high affinity dehydrogenase with a Km for cortisol in the nanomolar range. 11β-HSD-2 is found primarily in mineralocorticoid target tissues, such as kidney, colon, and placenta. Glucocorticoid action is initiated by the binding of glucocorticoids to receptors, such as glucocorticoid receptors and mineralocorticoid receptors. Through binding to its receptor, the main mineralocorticoid aldosterone controls the water and electrolyte balance in the body. However, the mineralocorticoid receptors have a high affinity for both cortisol and aldosterone. 11β-HSD-2 converts cortisol to inactive cortisone, therefore preventing the exposure of non-selective mineralocorticoid receptors to high levels of cortisol. Mutations in the gene encoding 11β-HSD-2 cause Apparent Mineralocorticoid Excess Syndrome (AME), which is a congenital syndrome resulting in hypokaleamia and severe hypertension. Patients have elevated cortisol levels in mineralocorticoid target tissues due to reduced 11β-HSD-2 activity. The AME symptoms may also be induced by administration of the 11β-HSD-2 inhibitor glycyrrhetinic acid. The activity of 11β-HSD-2 in placenta is probably important for protecting the fetus from excess exposure to maternal glucocorticoids, which may result in hypertension, glucose intolerance and growth retardation.
The effects of elevated levels of cortisol are also observed in patients who have Cushing's syndrome (D. N. Orth, N. Engl. J. Med. 332:791-803, 1995, M. Boscaro, et al., Lancet, 357: 783-791, 2001, X. Bertagna, et al, Cushing's Disease. In: Melmed S., Ed. The Pituitary. 2nd ed. Malden, Mass.: Blackwell; 592-612, 2002), which is a disease characterized by high levels of cortisol in the blood stream. Patients with Cushing's syndrome often develop many of the symptoms of type 2 diabetes, obesity, metabolic syndrome and dyslipidemia including insulin resistance, central obesity, hypertension, glucose intolerance, etc.
The compounds of this invention are selective inhibitors of 11β-HSD-1 when comparing to 11β-HSD-2. Previous studies (B. R. Walker et al., J. of Clin. Endocrinology and Met., 80: 3155-3159, 1995) have demonstrated that administration of 11β-HSD-1 inhibitors improves insulin sensitivity in humans. However, these studies were carried out using the nonselective 11β-HSD-1 inhibitor carbenoxolone. Inhibition of 11β-HSD-2 by carbenoxolone causes serious side effects, such as hypertension.
Although cortisol is an important and well-recognized anti-inflammatory agent (J. Baxer, Pharmac. Ther., 2:605-659, 1976), if present in large amount, it also has detrimental effects. For example, cortisol antagonizes the effects of insulin in the liver resulting in reduced insulin sensitivity and increased gluconeogenesis. Therefore, patients who already have impaired glucose tolerance have a greater probability of developing type 2 diabetes in the presence of abnormally high levels of cortisol.
Since glucocorticoids are potent regulators of glucose and lipid metabolism, excessive glucocorticoid action may lead to insulin resistance, type 2 diabetes, dyslipidemia, visceral obesity and hypertension. The present invention relates to the administration of a therapeutically effective dose of an 11β-HSD-1 inhibitor for the treatment, control, amelioration, and/or delay of onset of diseases and conditions that are mediated by excess or uncontrolled, amounts or activity of cortisol and/or other corticosteroids. Inhibition of the 11β-HSD-1 enzyme limits the conversion of inactive cortisone to active cortisol. Cortisol may cause, or contribute to, the symptoms of these diseases and conditions if it is present in excessive amounts. Dysregulation of glucocorticoid activity has been linked to metabolic disorders, including type 2 diabetes, metabolic syndrome, Cushing's Syndrome, Addison's Disease, and others. Glucocorticoids upregulate key glucoeneogenic enzymes in the liver such as PEPCK and G6Pase, and therefore lowering local glucocorticoid levels in this tissue is expected to improve glucose metabolism in type 2 diabetics. 11β-HSD-1 receptor whole-body knockout mice, and mice overexpressing 11β-HSD-2 in fat (resulting in lower levels of active glucocorticoid in fat) have better glucose control than their wild type counterparts (Masuzaki, et al.; Science. 294: 2166-2170, 2001; Harris, et al.; Endocrinology. 142: 114-120, 2001; Kershaw et al.; Diabetes. 54: 1023-1031, 2005). Therefore, specific 11β-HSD-1 inhibitors could be used for the treatment or prevention of type 2 diabetes and/or insulin resistance.
By reducing insulin resistance and maintaining serum glucose at normal concentrations, compounds of this invention may also have utility in the treatment and prevention of the numerous conditions that often accompany type 2 diabetes and insulin resistance, including the metabolic syndrome, obesity, reactive hypoglycemia, and diabetic dyslipidemia. The following diseases, disorders and conditions are related to type 2 diabetes, and some or all of these may be treated, controlled, prevented and/or have their onset delayed, by treatment with the compounds of this invention: hyperglycemia, low glucose tolerance, insulin resistance, obesity, lipid disorders, dyslipidemia, hyperlipidemia, hypertriglyceridemia, hypercholesterolemia, low HDL levels, high LDL levels, atherosclerosis and its sequelae, vascular restenosis, pancreatitis, abdominal obesity, neurodegenerative disease, retinopathy, nephropathy, neuropathy, metabolic syndrome and other disorders where insulin resistance is a component. Abdominal obesity is closely associated with glucose intolerance (C. T. Montaque et al., Diabetes, 49: 883-888, 2000), hyperinsulinemia, hypertriglyceridemia, and other factors of metabolic syndrome (also known as Syndrome X), such as high blood pressure, elevated LDL, and reduced HDL. Animal data supporting the role of HSD1 in the pathogenesis of the metabolic syndrome is extensive (Masuzaki, et al.; Science. 294: 2166-2170, 2001; Paterson et al.; Proc Natl. Acad. Sci. USA. 101: 7088-93, 2004; Montague and O'Rahilly; Diabetes. 49: 883-888, 2000). Thus, administration of an effective amount of an 11β-HSD-1 inhibitor may be useful in the treatment or control of the metabolic syndrome. Furthermore, administration of an 11β-HSD-1 inhibitor may be useful in the treatment or control of obesity by controlling excess cortisol, independent of its effectiveness in treating or prophylactically treating NIDDM. Long-term treatment with an 11β-HSD-1 inhibitor may also be useful in delaying the onset of obesity, or perhaps preventing it entirely if the patients use an 11β-HSD-1 inhibitor in combination with controlled diet and exercise. Potent, selective 11β-HSD-1 inhibitors should also have therapeutic value in the treatment of the glucocorticoid-related effects characterizing the metabolic syndrome, or any of the following related conditions: hyperglycemia, low glucose tolerance, insulin resistance, obesity, lipid disorders, dyslipidemia, hyperlipidemia, hypertriglycidemia, hypercholesterolemia, low HDL levels, high LDL levels, atherosclerosis, vascular restenosis, pancreatitis, obesity, neurodegenerative disease, retinopathy, nephropathy, hepatic steatosis or related liver diseases, and Syndrome X, and other disorders where insulin resistance is a component.
11β-HSD-1 is expressed in pancreatic islet cells, where active glucocorticoids have a negative effect on glucose stimulated insulin secretion (Davani et al.;. Biol. Chem. 10: 34841-34844,2000; Tadayyon and Smith. Expert Opin. Investig. Drugs. 12: 307-324,2003; Billaudel and Sutter. J. Endocrinol. 95: 315-20, 1982.). It has been reported that the conversion of dehydrocorticosterone to corticosterone by 11β-HSD-1 inhibits insulin secretion from isolated murine pancreatic beta cells. Incubation of isolated islets with an 11β-HSD-1 inhibitor improves glucose stimulated insulin secretion. An earlier study suggested that glucocorticoids reduce insulin secretion in vivo. (B. Billaudel et al., Horm. Metab. Res. 11: 555-560, 1979). Therefore, inhibition of 11β-HSD-1 enzyme in the pancreas may improve glucose stimulated insulin release.
Glucocorticoids may bind to and activate glucocorticoid receptors (and possibly mineralocorticoid receptors) to potentiate the vasoconstrictive effects of both catecholamines and angiotensin II (M. Pirpiris et al., Hypertension, 19:567-574, 1992, C. Kornel et al., Steroids, 58: 580-587, 1993, B. R. Walker and B. C. Williams, Clin. Sci. 82:597-605, 1992). The 11β-HSD-1 enzyme is present in vascular smooth muscle, which is believed to control the contractile response together with 11β-HSD-2. High levels of cortisol in tissues where the mineralocorticoid receptor is present may lead to hypertension. Therefore, administration of a therapeutic dose of an 11β-HSD-1 inhibitor should be effective in treating or prophylactically treating, controlling, and ameliorating the symptoms of hypertension.
11β-HSD-1 is expressed in mammalian brain, and published data indicates that glucocorticoids may cause neuronal degeneration and dysfunction, particularly in the aged (de Quervain et al.; Hum Mol Genet. 13: 47-52,2004; Belanoffet al. J. Psychiatr Res. 35: 127-35, 2001). Evidence in rodents and humans suggests that prolonged elevation of plasma glucocorticoid levels impairs cognitive function that becomes more profound with aging. (See, A. M. Issa et al., J. Neurosci., 10:3247-3254, 1990, S. J. Lupien et. al., Nat. Neurosci., 1:69-73 1998, J. L. Yau et al., Neuroscience, 66: 571-581, 1995). Chronic excessive cortisol levels in the brain may result in neuronal loss and neuronal dysfunction. (See, D. S. Kerr et al., Psychobiology 22: 123-133, 1994, C. Woolley, Brain Res. 531: 225-231, 1990, P. W. Landfield, Science, 272: 1249-1251, 1996). Furthermore, glucocorticoid-induced acute psychosis exemplifies a more pharmacological induction of this response, and is of major concern to physicians when treating patients with these steroidal agents (Wolkowitz et al.; Ann NY Acad Sci. 1032: 191-4, 2004). Thekkapat et al have recently shown that 11β-HSD-1 mRNA is expressed in human hippocampus, frontal cortex and cerebellum, and that treatment of elderly diabetic individuals with the non-selective 11β-HSD-1 and 11β-HSD-2 inhibitor carbenoxolone improved verbal fluency and memory (Proc Natl Acad Sci USA. 101: 6743-9, 2004). Therefore, administration of a therapeutic dose of an 11β-HSD-1 inhibitor may reduce, ameliorate, control and/or prevent the cognitive impairment associated with aging, neuronal dysfunction, dementia, and steroid-induced acute psychosis.
Cushing's syndrome is a life-threatening metabolic disorder characterized by chronically elevated glucocorticoid levels caused by either excessive endogenous production of cortisol from the adrenal glands, or by the administration of high doses of exogenous glucocorticoids, such as prednisone or dexamethasone, as part of an anti-inflammatory treatment regimen. Typical Cushingoid characteristics include central obesity, diabetes and/or insulin resistance, dyslipidemia, hypertension, reduced cognitive capacity, dementia, osteoporosis, atherosclerosis, moon faces, buffalo hump, skin thinning, and sleep deprivation among others (Principles and Practice of Endocrinology and Metabolism. Edited by Kenneth Becker, Lippincott Williams and Wilkins Pulishers, Philadelphia, 2001; pg 723-8). It is therefore expected that potent, selective 11β-HSD-1 inhibitors would be effective for the treatment of Cushing's disease.
As previously described above, 11β-HSD-1 inhibitors may be effective in the treatment of many features of the metabolic syndrome including hypertension and dyslipidemia. The combination of hypertension and dyslipidemia contribute to the development of atherosclerosis, and therefore it would be expected that administration of a therapeutically effective amount of an 11β-HSD-1 inhibitor would treat, control, delay the onset of, and/or prevent atherosclerosis and other metabolic syndrome-derived cardiovascular diseases.
One significant side effect associated with topical and systemic glucocorticoid therapy is corticosteroid-induced glaucoma. This condition results in serious increases in intraocular pressure, with the potential to result in blindness (Armaly et al.; Arch Ophthalmol. 78: 193-7, 1967; Stokes et al.; Invest Ophthalmol Vis Sci. 44: 5163-7, 2003.). The cells that produce the majority of aqueous humor in the eye are the nonpigmented epithelial cells (NPE). These cells have been demonstrated to express 11β-HSD-1, and consistent with the expression of 11β-HSD-1, is the finding of elevated ratios of cortisol:cortisone in the aqueous humor (Rauz et al.; Invest Ophthalmol Vis Sci. 42: 2037-2042, 2001). Furthermore, it has been shown that patients who have glaucoma, but who are not taking exogenous steroids, have elevated levels of cortisol vs. cortisone in their aqueous humor (Rauz et al.; QJM. 96: 481-490,2003.) Treatment of patients with the nonselective 11β-HSD-1 and 11β-HSD-2 inhibitor carbenoxolone for 4 and 7 days significantly lowered intraocular pressure by 10% and 17% respectively, and lowered local cortisol generation within the eye (Rauz et al.; QJM. 96: 481-490, 2003). Therefore, administration of 11β-HSD-1 specific inhibitors could be used for the treatment of glaucoma.
In certain disease states, such as tuberculosis, psoriasis, and stress in general, high glucocorticoid activity shifts the immune response to a humoral response, when in fact a cell based response may be more beneficial to the patients. Inhibition of 11β-HSD-1 activity may reduce glucocorticoid levels, thereby shifting the immuno response to a cell based response. (D. Mason, Immunology Today, 12: 57-60, 1991, G. A. W. Rook, Baillier's Clin. Endocrinol. Metab. 13: 576-581, 1999). Therefore, administration of 11β-HSD-1 specific inhibitors could be used for the treatment of tuberculosis, psoriasis, stress in general, and diseases or conditions where high glucocorticoid activity shifts the immune response to a humoral response.
Glucocorticoids are known to cause a variety of skin related side effects including skin thinning, and impairment of wound healing (Anstead, G. M. Adv Wound Care. 11: 277-85, 1998; Beer, et al.; Vitam Horm. 59: 217-39, 2000). 11β-HSD-1 is expressed in human skin fibroblasts, and it has been shown that the topical treatment with the non-selective 11β-HSD-1 and 11β-HSD-2 inhibitor glycerrhetinic acid increases the potency of topically applied hydrocortisone in a skin vasoconstrictor assay (Hammami, M M, and Siiteri, P K. J Clin. Endocrinol. Metab. 73: 326-34, 1991). Advantageous effects of selective 11β-HSD-1 inhibitors on wound healing have also been published (WO 2004/11310). It is therefore expected that potent, selective 11β-HSD-1 inhibitors would treat wound healing or skin thinning due to excessive glucocorticoid activity.
Excess glucocorticoids decrease bone mineral density and increase fracture risk. This effect is mainly mediated by inhibition of osteoblastic bone formation, which results in a net bone loss (C. H. Kim et al. J. Endocrinol. 162: 371-379, 1999, C. G. Bellows et al. 23: 119-125, 1998, M. S. Cooper et al., Bone 27: 375-381, 2000). Glucocorticoids are also known to increase bone resorption and reduce bone formation in mammals (Turner et al.; Calcif Tissue Int. 54: 311-5,1995; Lane, N E et al. Med Pediatr Oncol. 41: 212-6,2003). 11β-HSD-1 mRNA expression and reductase activity have been demonstrated in primary cultures of human osteoblasts in homogenates of human bone (Bland et al.; J. Endocrinol. 161: 455-464, 1999; Cooper et al.; Bone, 23: 119-125, 2000; Cooper et al.; J. Bone Miner Res. 17: 979-986, 2002). In surgical explants obtained from orthopedic operations, 11β-HSD-1 expression in primary cultures of osteoblasts was found to be increased approximately 3-fold between young and old donors (Cooper et al.; J. Bone Miner Res. 17: 979-986, 2002). Glucocorticoids such as prednisone and dexamethasone are also commonly used to treat a variety of inflammatory conditions including arthritis, inflammatory bowl disease, and asthma. These steroidal agents have been shown to increase expression of 11β-HSD-1 mRNA and activity in human osteoblasts (Cooper et al.; J. Bone Miner Res. 17: 979-986, 2002). Similar results have been shown in primary osteoblast cells and MG-63 osteosarcoma cells where the inflammatory cytokines TNF alpha and IL-1 beta increase 11β-HSD-1 mRNA expression and activity (Cooper et al.; J. Bone Miner Res. 16: 1037-1044, 2001). These studies suggest that 11β-HSD-1 plays a potentially important role in the development of bone-related adverse events as a result of excessive glucocorticoid levels or activity. Bone samples taken from healthy human volunteers orally dosed with the non-selective 11β-HSD-1 and 11β-HSD-2 inhibitor carbenoxolone showed a significant decrease in markers of bone resorption (Cooper et al.; Bone. 27: 375-81, 2000). Therefore, administration of an 11β-HSD-1 specific inhibitor may be useful for preventing bone loss due to glucocorticoid-induced or age-dependent osteroporosis.
Therapeutic Compositions-Administration-Dose Ranges
Therapeutic compositions of the present compounds comprise an effective amount of the same formulated with one or more therapeutically suitable excipients. The term “therapeutically suitable excipient,” as used herein, represents a non-toxic, solid, semi-solid or liquid filler, diluent, encapsulating material, or formulation auxiliary of any type. Examples of therapeutically suitable excipients include sugars; cellulose and derivatives thereof; oils; glycols; solutions; buffering, coloring, releasing, coating, sweetening, flavoring, and perfuming agents; and the like. These therapeutic compositions may be administered parenterally, intracistemally, orally, rectally, or intraperitoneally.
Liquid dosage forms for oral administration of the present compounds comprise formulations of the same as emulsions, microemulsions, solutions, suspensions, syrups, and elixirs. In addition to the compounds, the liquid dosage forms may contain diluents and/or solubilizing or emulsifying agents. Besides inert diluents, the oral compositions may include wetting, emulsifying, sweetening, flavoring, and perfuming agents.
Injectable preparations of the present compounds comprise sterile, injectable, aqueous and oleaginous solutions, suspensions or emulsions, any of which may be optionally formulated with parenterally suitable diluents, dispersing, wetting, or suspending agents. These injectable preparations may be sterilized by filtration through a bacterial-retaining filter or formulated with sterilizing agents that dissolve or disperse in the injectable media.
The absorption of the compounds of the present invention may be delayed by using a liquid suspension of crystalline or amorphous material with poor water solubility. The rate of absorption of the compounds depends upon their rate of dissolution that, in turn, depends on their crystallinity. Delayed absorption of a parenterally administered compound may be accomplished by dissolving or suspending the compound in oil. Injectable depot forms of the compounds may also be prepared by microencapsulating the same in biodegradable polymers. Depending upon the ratio of compound to polymer and the nature of the polymer employed, the rate of release may be controlled. Depot injectable formulations are also prepared by entrapping the compounds in liposomes or microemulsions that are compatible with body tissues.
Solid dosage forms for oral administration of the present compounds include capsules, tablets, pills, powders, and granules. In such forms, the compound is mixed with at least one inert, therapeutically suitable excipient such as a carrier, filler, extender, disintegrating agent, solution retarding agent, wetting agent, absorbent, or lubricant. With capsules, tablets, and pills, the excipient may also contain buffering agents. Suppositories for rectal administration may be prepared by mixing the compounds with a suitable non-irritating excipient that is solid at ordinary temperature but fluid in the rectum.
The present compounds may be micro-encapsulated with one or more of the excipients discussed previously. The solid dosage forms of tablets, dragees, capsules, pills, and granules may be prepared with coatings and shells such as enteric and release-controlling. In these forms, the compounds may be mixed with at least one inert diluent and may optionally comprise tableting lubricants and aids. Capsules may also optionally contain opacifying agents that delay release of the compounds in a desired part of the intestinal tract.
Transdermal patches have the added advantage of providing controlled delivery of the present compounds to the body. Such dosage forms are prepared by dissolving or dispensing the compounds in the proper medium. Absorption enhancers may also be used to increase the flux of the compounds across the skin, and the rate of absorption may be controlled by providing a rate controlling membrane or by dispersing the compounds in a polymer matrix or gel.
Disorders may be treated and/or prophylactically treated in a patient by administering to the patient a therapeutically effective amount of compound of the present invention in such an amount and for such time as is necessary to achieve the desired result. The term “therapeutically effective amount,” refers to administration of a sufficient amount of a compound of formula (I-X) to effectively treat and/or prophylactically treat disorders modulated by the 11-beta-hydroxysteroid dehydrogenase type 1 enzyme at a reasonable benefit/risk ratio applicable to medical treatments. The specific therapeutically effective dose level for any patient population may depend upon one or more factors including, but not limited to, the disorder being treated; the severity of the disorder; the activity of the compound employed; the specific composition employed; age; body weight; general health; gender; diet; time of administration; route of administration; rate of excretion; treatment duration; drugs used in combination; and, coincidental therapy.
The present invention also includes pharmaceutically active metabolites formed by in vivo biotransformation of compounds of formula (I-X). The term “therapeutically suitable metabolite”, as used herein, refers to a pharmaceutically active compound formed by the in vivo biotransformation of compounds of formula (I-X), such as, adamantane hydroxylation and polyhydroxylation metabolites. A discussion of biotransformation is provided in Goodman and Gilman's, The Pharmacological Basis of Therapeutics, seventh edition, MacMillan Publishing Company, New York, N.Y., (1985).
The total daily dose of the compounds of the present invention to effectively inhibit the action of 11-beta-hydroxysteroid dehydrogenase type 1 enzyme in single or divided doses range from about 0.01 mg/kg/day to about 50 mg/kg/day body weight. More preferably, the single or multiple dose ranges from about 0.1 mg/kg/day to about 25 mg/kg/day body weight. Single dose compositions may contain such amounts or multiple doses thereof of the compounds of the present invention to make up the daily dose. In general, treatment regimens comprise administration to a patient from about 10 mg to about 1000 mg of the compounds per day in single or multiple doses.
It is understood that the foregoing detailed description and accompanying examples are merely illustrative and are not to be taken as limitations upon the scope of the invention, which is defined solely by the appended claims and their equivalents. Various changes and modifications to the disclosed embodiments will be apparent to those skilled in the art. Such changes and modifications, including without limitation those relating to the chemical structures, substituents, derivatives, intermediates, syntheses, formulations and/or methods of use of the invention, may be made without departing from the spirit and scope thereof.
This application claims priority from U.S. Provisional Patent Application Ser. No. 60/618,775, filed Oct. 14, 2004, which claims priority from U.S. Provisional Patent Application Ser. No. 60/566,260, filed Apr. 29, 2004, which is incorporated herein by reference.
| Number | Date | Country | |
|---|---|---|---|
| 60618775 | Oct 2004 | US | |
| 60566260 | Apr 2004 | US |
