Novel Phosphorus-Containing Thyromimetics

Abstract

The present invention relates to compounds of phosphonic acid-containing T3 mimetics and monoesters thereof, stereoisomers, pharmaceutically acceptable salts, co-crystals, and prodrugs thereof and pharmaceutically acceptable salts and co-crystals of the prodrugs, as well as their preparation and uses for preventing and / or treating metabolic diseases such as obesity, NASH, hypercholesterolemia and hyperlipidemia, as well as associated conditions such as atherosclerosis, coronary heart disease, impaired glucose tolerance, metabolic syndrome x and diabetes.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of U.S. application Ser. No. 11 / 137,773, filed May 26, 2005, which is a continuation-in-part of PCT / US2004 / 039024, filed Nov. 19, 2004, which claims the benefit, under 35 U.S.C. §119(e), of the earlier filing date of U.S. Provisional Application No. 60 / 598,524, filed Aug. 3, 2004, and U.S. Provisional Application No. 60 / 523,830, filed Nov. 19, 2003. This application also claims the benefit of U.S. Provisional Application No. 60 / 725,170, filed Oct. 6, 2005. The contents of these applications are incorporated by reference herein in their entirety, including figures.FIELD OF THE INVENTION[0002]The present invention is directed toward phosphonic acid-containing compounds and monoesters thereof that are thyroid receptor ligands, pharmaceutically acceptable salts, and to prodrugs of these compounds as well as their preparation and uses for preventing and / or treating metabolic diseases such as obesity, NASH, h...

AI Technical Summary

Benefits of technology

[0036]The present invention relates to phosphonic acid- and phosphonic acid monoester-containing compounds that bind to thyroid receptors in the liver. Activation of these receptors results in modulation of gene expression of genes regulated by thyroid hormones. The present invention also relates to pharmaceutically acceptable salts and co-crystals, prodrugs, and pharmaceutically acceptable salts and co-crystals of these prodrugs of these compounds. The compounds can be used to treat diseases and disorders including metabolic diseases. In one aspect, the phosphonic acid- and phosphonic acid monoester-containing compounds are useful for improving efficacy, improving the therapeutic index, e.g., decreasing non-liver related toxicities and side effects, or for improving liver selectivity, i.e., increasing distribution of an active drug to the liver relative to extrahepatic tissues and more specifically increasing distribution of the an active drug to the nucleus of liver cells relative to the nucleus of extrahepatic tissue cells (including heart, kidney and pituitary). Prodrugs of the phosphonic acid- and phosphonic acid monoester-containing compounds are useful for increasing oral bioavailability and sustained delivery of the phosphorus-containing compounds.

[0110]The term “prodrug” as used herein refers to any compound that when administered to a biological system generates a biologically active compound as a result of spontaneous chemical reaction(s), enzyme catalyzed chemical reaction(s), and / or metabolic chemical reaction(s), or a combination of each. Standard prodrugs are formed using groups attached to functionality, e.g., HO—, HS—, HOOC—, R2N—, associated with the drug, that cleave in vivo. Standard prodrugs include but are not limited to carboxylate esters where the group is alkyl, aryl, aralkyl, acyloxyalkyl, alkoxycarbonyloxyalkyl as well as esters of hydroxyl, thiol and amines where the group attached is an acyl group, an alkoxycarbonyl, aminocarbonyl, phosphate or sulfate. The groups illustrated are exemplary, not exhaustive, and one skilled in the art could prepare other known varieties of prodrugs. Such prodrugs of the compounds of the present invention fall within this scope. Prodrugs must undergo some form of a chemical transformation to produce the compound that is biologically active or is a precursor of the biologically active compound. In some cases, the prodrug is biologically active, usually less than the drug itself, and serves to improve drug efficacy or safety through improved oral bioavailability, and / or pharmacodynamic half-life, etc. Prodrug forms of compounds may be utilized, for example, to improve bioavailability, improve subject acceptability such as by masking or reducing unpleasant characteristics such as bitter taste or gastrointestinal irritability, alter solubility such as for intravenous use, provide for prolonged or sustained release or delivery, improve ease of formulation, or provide site-specific delivery of the compound. Prodrugs are described in The Organic Chemistry of Drug Design and Drug Action, by Richard B. Silverman, Academic Press, San Diego, 1992. Chapter 8: “Prodrugs and Drug delivery Systems” pp. 352-401; Design of Prodrugs, edited by H. Bundgaard, Elsevier Science, Amsterdam, 1985; Design of Biopharmaceutical Properties through Prodrugs and Analogs, Ed. by E. B. Roche, American Pharmaceutical Association, Washington, 1977; and Drug Delivery Systems, ed. by R. L. Juliano, Oxford Univ. Press, Oxford, 1980.

[0161]The term “atherosclerosis” refers to a condition characterized by irregularly distributed lipid deposits in the intima of large and medium-sized arteries wherein such deposits provoke fibrosis and calcification. Atherosclerosis raises the risk of angina, stroke, heart attack, or other cardiac or cardiovascular conditions.

Problems solved by technology

Much of the energy, however, is lost in the form of heat (thermogenesis), which is associated with an increase in mitochondrial proton leak possibly arising from TH-mediated effects on mitochondrial membrane, uncoupling proteins, enzymes involved in the inefficient sn-glycerol 3-phosphate shuttle such as mitochondrial sn-glycerol 3-phosphate dehydrogenase (mGPDH), and / or enzymes associated with proton leakage such as the adenine nucleotide transporter (ANT), Na+ / K+-ATPase, Ca2+-ATPase and ATP synthase.

The effectiveness of TH treatment is complicated by the need for supraphysiological doses of T3 and the associated side effects, which include cardiac problems, muscle weakness and erosion of body mass.

Long-term therapy has also been associated with bone loss.

The effectiveness of T3 to induce weight loss may be attenuated by defects in TH action.

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