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(12) United States Patent (10) Patent No.: US 6,541,479 B1 Mehanna Et Al

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(12) United States Patent (10) Patent No.: US 6,541,479 B1 Mehanna Et Al USOO6541479 B1 (12) United States Patent (10) Patent No.: US 6,541,479 B1 Mehanna et al. (45) Date of Patent: Apr. 1, 2003 (54) CALCIUM CHANNEL BLOCKERS 5,132,106 A 7/1992 Tuloup et al. ................ 424/70 5,134,139 A 7/1992 Kawai et al. ............... 514/211 (75) Inventors: Ahmed S. Mehanna, Sudbury; Jinyung 5,135,936 A 8/1992 Adams et al. .............. 514/305 T. Kim, Boston, both of MA (US) 5,144,029 A 9/1992 Ward et al. ................. 540/610 5,198.433 A 3/1993 Palfreyman et al. ........ 514/212 5,276,026 A 1/1994 Barrish et al. .............. 514/212 (73) ASSignee: Masays sole of Pharmacy, 5,281,592 A 1/1994 Ozeki et al. ............. 514/224.2 s 5,344,830 A 9/1994 Mills et al. .............. 514/235.8 (*) Notice: Subject to any disclaimer, the term of this rig: A : y R t t r 5. patent is extended or adjusted under 35 5,496,815. A 3/1996 Ozeki et al. ............. 514/224.2 U.S.C. 154(b) by 0 days. 5,514,693 A 5/1996 Cozzi et al. ................ 514/341 5,607,939 A 3/1997 Kato et al. .................. 514/278 (21) Appl. No.: 08/982,953 5,623,051. A 4/1997 Catterall et al. ............ 530/324 (22) Filed: Dec. 2, 1997 OTHER PUBLICATIONS (51) Int. Cl." .............................................. A61K31/495 Abstract to Gialdi et al. of CA56:4664g, Mar. 8, 1962.* (52) U.S. Cl. ................................... 514/255.01: 514/310 Fugita, M. et al., "Synthesis and Ca" Antagonistic Activity (58) Field of Search ............................. 514310, 25so of...." J. Medicinal Chemistry, (1990), 33.7, 1898–1905. Yamamoto, K. et al., “Novel Calcium Antagonists . J. (56) References Cited Med. Chem. (1988), 31:919–930. Jilek, J.; et al., “Preparation of new antimicrobial (phenylth U.S. PATENT DOCUMENTS io)benzylamines”, Chemical Abstracts Accession No. 4,550,116 A 10/1985 Soto et al. .................. 514327 1992:612134 (Abstract only). 4,593,033 A 6/1986 Hartman et al. ... 514/290 Jilek, J., et al., “Potential antidepressants: 2-(methyoxy-and 4,596,805 A 6/1986 Jiang ................ ... 514/258 hydroxyphenylthio) benzylamines as selective inhibitors of 4,640,930 A 2/1987 Mohacsi et al. .. ... 514/431 5-hydroxytryptamine re-uptake in the brain”, Chemical 4,654,353 A 3/1987 Alker et al. ...... ... S14/334 Abstracts Accession No. 1990:458596 (Abstract only). 4,742,069 A 5/1988 Jaunin et al. ..... ... 514/356 4,758,669 A 7/1988 Johnson et al. ... ... 546/263 * cited by examiner 4,791,117 A 12/1988 Press ................ ... 514/300 4,829.076 A 5/1989 Szilagyi et al. ............. 514/356 Primary Examiner Dwayne C. Jones 4,847.273 A 7/1989 Jaunin et al. ..... ... 514/347 (74) Attorney, Agent, or Firm Wolf, Greenfield & Sacks, 4,918,073. A 4/1990 Riger et al. ... ... 514/255 P.C. 4,918,074 A 4/1990 Tsuda et al. ...... ... 514/258 4.959,359 A 9/1990 Mohacsi et al. .. ... 514/211 (57) ABSTRACT 4.988,713 A 1/1991 Frigerio ............ ... 514/356 - 4992,432 A 2/1991 Mohacsi et al. ............ 514/211 The invention involves the identification of a family of 4,994612 A 2/1991 Jaunin et al. ................. 564/88 compounds which block calcium channels. The compounds 5,017,586 A 5/1991 Schlager ..................... 514/318 can be formulated in pharmaceutical carriers and adminis 5,025,010 A 6/1991 Oekonomopulos et al. .. 514/224 tered to Subjects. The compounds are useful for treating 5,034,395 A 7/1991 Tamada et al. ............. 544/365 disorders associated with calcium channel activity, Such as, 5,036,098 A 7/1991 Kimura et al............... 514/438 cardiovascular diseases, for example hypertension, conges 5,039,674. A 8/1991 Fujikura et al. ............ 514/212 tive heart failure, arrhythmia and angina 5,070,088 A 12/1991 Atwal .............. ... 514/212 s 5,071,844 A 12/1991 AIker et al. ... ... 514/211 5,106,845. A 4/1992 Carr et al. .................. 514/218 16 Claims, 4 Drawing Sheets U.S. Patent Apr. 1, 2003 Sheet 1 of 4 US 6,541,479 B1 FIG. 1 1. 2 R. R. S-CH R mem-a R R R5 R (9) co 5 4. COCl. (5) N / \ R, H-N N-R (7) \ / (8) R. R. O. R; R, Roy Rio - = alkyl, piperOnyl, or -CH2 R N U.S. Patent Apr. 1, 2003 Sheet 2 of 4 US 6,541479 B1 FIG 2 10 - -O- COMP #1 5 -o--o-CONTROL DILT O -5 CHARGE IN AO MAP (mmHg) 10 30 60 100 130 180 27 O 500 DOSE IN MCG/KG FIG. 3 CHANGE IN MAP (mmHg) 10 30 SO 100 130 180 27 O 500 DOSE IN MCG/KG U.S. Patent Apr. 1, 2003 Sheet 3 of 4 US 6,541,479 B1 FIG. 4 CHANGE IN MAP (mmHg) 10 30 SO 100 130 BO 270 500 DOSE IN MCG/KG FIG. 5 -O- COMP 4 -O-DILT. -- CONTROL CHANGE IN MAP (mmHg) 10 30 SO 100 130 180 27O 500 DOSE IN MCG/KG U.S. Patent Apr. 1, 2003 Sheet 4 of 4 US 6,541479 B1 FIG. 6 10 -o- COMP 5 5 -O-DILT. n CONTROL O -5 CHANGE IN O MAP (mmHg) - 15 -20 -25 -30 10 30 SO 100 130 18O 270 500 DOSE IN MCG/KG US 6,541479 B1 1 2 CALCIUM CHANNEL BLOCKERS which the Seven membered ring of diltiazem was replaced with 6- and 5-membered fused-ring systems. These two new classes of calcium channel blockers, the benzothiazine and FIELD OF THE INVENTION benzothiazole respectively (Yamamoto, K., J. Med. Chem., This invention relates to a class of aromatic compounds v. 31, p. 919–930(1988); Fujita, M., J. Med. Chem., v.33, p. which are blockers of calcium channels. The invention also 1898-1905 (1990)) demonstrated potent calcium channel relates to pharmaceutical compositions, methods of blocking blocking activity. Some of these compounds even demon calcium channels, kits and methods of treatment using the Strated more tissue Selectivity toward calcium channels in class of compounds described herein, as well as intermediate blood vessels. compounds useful in the preparation of the compounds. 1O SUMMARY OF THE INVENTION BACKGROUND OF THE INVENTION A new family of calcium channel blockers, which are Calcium channel blockers are a chemically diverse class defined by the structures set forth below, have been identi of compounds having important therapeutic value in the fied according to the invention. The members of the new control of a variety of diseases including Several cardiovas 15 family of compounds constitute a new class of calcium cular disorders, Such as hypertension, angina, and cardiac channel blockers which is not encompassed by any of the arrhythmias (Fleckenstein, Cir. ReS. V. 52, (Suppl. 1), three known classes of calcium channel blockers, the p. 13-16 (1983); Fleckenstein, Experimental Facts and dihydropyridines, the phenyl alkyl amines, or the benzothi Therapeutic Prospects, John Wiley, New York (1983); aZepines. Of the three known classes the compounds of the McCall, D., Curr Pract Cardiol, v. 10, p. 1-11 (1985)). invention are most structurally similar to the benzothiaz Calcium channel blockers are a heterogenous group of epine class of calcium channel blockers, which have the drugs that prevent or slow the entry of calcium into cells by following Structural formula. regulating cellular calcium channels. (Remington, The Sci ence and Practice of Pharmacy, Nineteenth Edition, Mack as / Publishing Company, Eaton, Pa., p.963 (1995)). The regu N C lation of calcium entry into the cells of the cardiovascular 1. 2 System is of paramount importance to the proper functioning 5 1-C -Rs of this System. Cardiac and vascular Smooth muscle cells R, q=NN have calcium channels within the cell membrane. Calcium R influx through these channels initiates a process of electro mechanical coupling which ultimately leads to muscle con traction. The ability to regulate the entry of calcium into cardiac and vascular Smooth muscle cells is a powerful therapeutic approach in the treatment of angina and hyper- as tension respectively. Likewise, blocking calcium influx into Prior to the instant invention it was believed that the fused cardiac tissues and conduction Systems provides a useful ring Structure of the benzothiazepines was essential for the approach to control certain types of arrhythmia. calcium channel blocking activity of these compounds. Calcium channel blockers are also believed to be useful in Applicants, however, have Surprisingly discovered that com the treatment of other disorders in which the regulation of 40 pounds having the basic central atomic structure of the calcium plays a role in normal hemostasis. Such disorders benzothiazepines but lacking the fused ring Structure have include, for example, pulmonary hypertension, peripheral calcium channel blocking activity and actually demonstrate vascular disease, mild congestive heart failure, hypertrophic comparable anti-hypertensive activity to traditional ben Subaortic Stenosis, protection againstischemic injury, Stroke, Zothiazepines Such as diltiazem. migraine, tumor resistance to anti-neoplastic drugs, 45 In one aspect the invention is a composition of a com achalasia, esophageal Spasms, bronchial asthma, premature pound having the following Structural formula: labor, dySmenorrhea, and enhancement of Success in renal transplantation. (Remington, The Science and Practice of Ar-X-Ara Pharmacy, Nineteenth Edition, Mack Publishing Company, Eaton, Pa., p.963 (1995)). 50 wherein Ara is an aryl group or a heteroaryl group, Most of the currently available calcium channel blockers wherein the heteroaryl is a ring having 5, 6, or 7 atoms, belong to one of three major chemical groups of drugs, the and wherein at least one atom of the heteroaryl is dihydropyridines, Such as nifedipine, the phenyl alkyl Selected from the group consisting of a Sulfur, a amines, Such as Verapamil, and the benzothiazepines Such as nitrogen, and an oxygen atom, and which is Substituted diltiazem.
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