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(12) Patent Application Publication (10) Pub. No.: US 2007/0293552 A1 Gorczynski (43) Pub US 20070293552A1 (19) United States (12) Patent Application Publication (10) Pub. No.: US 2007/0293552 A1 Gorczynski (43) Pub. Date: Dec. 20, 2007 (54) ANTIHYPERTENSIVE THERAPY METHOD Publication Classification (76) Inventor: Richard J. Gorczynski, Westminster, (51) Int. Cl. CO (US) A6II 3/42 (2006.01) (52) U.S. Cl. .............................................................. S14/378 Correspondence Address: (57) ABSTRACT HARNESS, DICKEY, & PIERCE, P.L.C Methods and therapeutic combinations are provided for 7700 BONHOMME, STE 400 lowering blood pressure in a Subject exhibiting resistance to ST. LOUIS, MO 63105 (US) a baseline antihypertensive therapy with one or more drugs, or a subject having diabetes and/or chronic kidney disease. A method of the invention comprises administering, in some (21) Appl. No.: 11/761,499 embodiments adjunctively with a modified baseline therapy, a compound of formula (I) as defined herein. A therapeutic (22) Filed: Jun. 12, 2007 combination of the invention comprises a compound of formula (I); at least one diuretic; and at least one antihy pertensive drug selected from ACE inhibitors, angiotensin II Related U.S. Application Data receptor blockers, beta-adrenergic receptor blockers and calcium channel blockers; wherein the at least one diuretic (60) Provisional application No. 60/813.966, filed on Jun. and/or the at least one antihypertensive drug are present at 15, 2006. substantially less than a full dose. US 2007/0293552 A1 Dec. 20, 2007 ANTHYPERTENSIVE THERAPY METHOD signaling pathways. While antagonism of the ETA receptor is known to reduce endothelin-mediated vasoconstriction, 0001. This application claims the benefit of U.S. provi antagonism of the endothelin-B (ET) receptor can block sional application Ser. No. 60/813,966, filed Jun. 15, 2006, clearance of ET-1 from the circulatory system, exacerbating incorporated in its entirety herein by reference. its hypertensive effect. FIELD OF THE INVENTION 0007 Wu et al. (2004) J. Med. Chem. 47, 1969-1986 presented comparative information on a range of compounds 0002 The present invention relates to methods and thera having varying degrees of affinity and selectivity for ETA peutic combinations useful for lowering blood pressure. and having a general formula (I) that can be represented: BACKGROUND OF THE INVENTION (I) 0003 Blood pressure control can often be achieved by HC RI antihypertensive therapy with one or more drugs. Despite a wide range of drugs available for antihypertensive therapy, a segment of the patient population continues to exhibit ( \ resistance to a baseline antihypertensive therapy with one or Yo NH more drugs. A particularly challenging patient population SO has resistant hypertension. Resistant hypertension is defined 7 R2 by the Seventh Report of the Joint National Committee on Z R3 Prevention, Detection, Evaluation, and Treatment of High S Blood Pressure (JNC 7: Chobanian et al. (2003) Hyperten Sion 42:1206-1252) as a failure to achieve goal blood O pressure in patients who are adhering to full doses of an H3C R4 appropriate three-drug regimen that includes a diuretic. Further, resistant hypertension is diagnosed by many phy sicians on the basis of a patient's resistance to adequate, but where, in certain of the compounds listed: less than full, doses of an appropriate three-drug regimen because of the risk or occurrence of adverse events associ 0008) R' is halo or C alkyl: ated with full doses. The terms "adequate” and “full in the 0009 R is hydrogen, C alkyl, (C. alkyl)carbonyl, present context are defined below. (C. cycloalkyl)carbonyl, cyano, halo, aminocarbonyl, di(C. alkyl)aminocarbonyl, (C- alkyl)sulfonyl, 0004. According to JNC 7, a goal of systolic blood oxazol-2-yl or benzoyl: pressure (SBP) <140 mmHg and diastolic blood pressure (DBP) <90 mmHg is recommended for patients with hyper 0010 R and R are independently hydrogen or C. tension and no other serious conditions. For patients with alkyl, or together form a methylenedioxy bridge; and serious or compelling conditions such as diabetes and chronic kidney disease, JNC 7 recommends a goal of SBP 0011 Z is CH, or NH. <130 mmHg and DBP <80 mmHg. Despite intensive, multi Among the compounds mentioned by Wu et al. are: drug therapy, only about 50% of patients with diabetes or chronic kidney disease reach traditional blood pressure 0012 sitaxsentan (N-(4-chloro-3-methylisoxazol-5- goals, with even fewer reaching the more stringent goals yl)-2-(2-(6-methyl-3,4-methylenedioxy-1-yl)acetyl)th now recommended by JNC 7. Thus, resistant hypertension is iophen-3-sulfonamide), in which R" is chloro, R is particularly acute for segments of the population which hydrogen, R and R form a methylenedioxy bridge, exhibit diabetes or chronic kidney disease. and Z is CH, and 0005. It should be noted that the British Hypertensive 0013 TBC37.11 (N-(2-acetyl-4,6-dimethylphenyl)-3- Society (BHD-IV: J. Human Hypertens. (2004) 18:139 (3,4-dimethylisoxazol-5-ylsulfamoyl)-thiophene-2- 185), the European Society of Hypertension/European Soci carboxamide), in which R" is methyl, R is acetyl, R is ety of Cardiology (ESH/ESC; J. Hypertens. (2003) 21:1011 hydrogen, R is methyl, and Z is NH. 1053), and the World Health Organization/International Wu et al. reported an ETA binding affinity (ICs) of Society of Hypertension (WHO/ISH: J. Hypertens. (2003) 1.4-0.5 nM for sitaxsentan and 0.08-0.02 nM for 21:1983-1992) guidelines propose similar but not identical TBC3711, and an ETAVET selectivity factor of 6.5x blood pressure goals for non-diabetic and diabetic patients. 10 for sitaxsentan and 441x10 for TBC37.11. 0006 Use of various selective endothelin-A (ETA) recep 0014) A clinical trial to test a selective ETA receptor tor antagonists to treat moderate hypertension has been antagonist of a different chemical class, namely darusentan, proposed or tested in clinical trials. Endothelin (more par for treatment of resistant hypertension was proposed in a ticularly the ET-1 isoform thereof) is a small peptide hor Myogen, Inc. news release dated Jul. 15, 2004 (http:// mone that is believed to play a critical role in control of investormyogen.com/phoenix.Zhtml?c=135160&p=iro1 blood flow and cell growth. Elevated endothelin blood levels are associated with several cardiovascular disease condi newsArticle&ID=759464&highlight=), later reported in tions, including pulmonary arterial hypertension, chronic Heart Disease Weekly, Aug. 15, 2004, p. 113. renal disease, coronary artery disease, hypertension, and 0015 New methods for lowering blood pressure continue chronic heart failure. Endothelin is a potent vasoconstrictor, to be much needed in the art. Such new methods would be triggering contraction through endothelin-receptor mediated of value if they afford one or more benefits over existing US 2007/0293552 A1 Dec. 20, 2007 therapies, for example one or more benefits as mentioned below, it being understood that recitation of any particular benefit sought does not limit the present invention to (I) embodiments exhibiting that benefit. HC RI 0016. Improved drug therapies for treatment of patients ( \ exhibiting resistance to a baseline antihypertensive therapy Yo NH with one or more drugs, and especially patients having SO resistant hypertension, would be highly desirable. Resistant 7 R2 hypertension is increasing in prevalence due to a variety of Z R3 contributing factors including an aging population, obesity, S patient noncompliance, and the effects of target-organ dis ease. Thus, a focus of current treatment of resistant hyper O tension is to identify and eliminate contributing factors. Despite reducing contributing factors, a Substantial propor tion of patients with resistant hypertension fail to achieve or a pharmaceutically acceptable salt thereof, where: blood pressure goals. 0024) R' is halo or Cs alkyl: 0017 Furthermore, a baseline antihypertensive therapy, 0025 R is hydrogen, C alkyl, (C. alkyl)carbonyl, whether or not a patient exhibits resistance thereto, can have (C. cycloalkyl)carbonyl, cyano, halo, aminocarbonyl, undesirable, in Some cases clinically unacceptable or even di(C. alkyl)aminocarbonyl, (C- alkyl)sulfonyl, dangerous, adverse side effects, especially when adminis oxazol-2-yl or benzoyl: tered at a full dose of each constituent drug in the therapy. 0026 R and R are independently hydrogen or C. 0018 Thus of particular benefit would be an effective alkyl, or together form a methylenedioxy bridge; and drug therapy for treatment of patients exhibiting resistance 0027 Z is CH or NH; to a baseline antihypertensive therapy with one or more drugs, and especially patients having resistant hypertension, wherein wherein the baseline therapy can be modified in a manner 0028 (a) the baseline therapy is modified by dose that results in a reduced risk or incidence of adverse events. reduction or elimination of at least one of said drugs; 0.019 Ambulatory blood pressure in most patients exhib 0029 (b) the baseline therapy is modified in a manner its a 24-hour cycle wherein both systolic and diastolic blood that results in a reduced risk or incidence of adverse pressures are typically higher during the day than at night. events; and/or Any beneficial change in a patient's 24-hour pattern of 0030) (c) a beneficial change in the subjects 24-hour ambulatory systolic and/or diastolic blood pressure would be pattern of systolic and/or diastolic blood pressure is desirable where the patient exhibits resistance to a baseline obtained. antihypertensive therapy with one or more drugs, and espe A closely related embodiment provides use of a com cially where the patient has resistant hypertension. pound of formula (I) in preparation of a medicament for adjunctive administration to lower blood pressure in a 0020. In patients having resistant hypertension, improved Subject exhibiting resistance to a baseline antihyper renal and/or cardiovascular function, including prevention tensive therapy with one or more drugs; said adjunctive of cardiovascular adverse events, would be of great benefit.
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