United States Patent (10) Patent No.: US 8,859,550 B2 Chen Et Al
US00885955OB2 (12) United States Patent (10) Patent No.: US 8,859,550 B2 Chen et al. (45) Date of Patent: *Oct. 14, 2014 (54) HETEROCYCLIC INHIBITORS OF FOREIGN PATENT DOCUMENTS HISTAMINE RECEPTORS FOR THE TREATMENT OF DISEASE Wo 2004:36 A 358 (75) Inventors: Pingyun Chen, Chapel Hill, NC (US); W. SS: A. 33. Stephen A. R. Carino, Del Mar, CA WO 2009098320 A2 8, 2009 (US); Ricky Wayne Couch, Durham, WO 2010030785 A2 3, 2010 NC (US); Daniel S. Kinder, Del Mar, W. 38H 73 A. 338 sS); Beth A. Norton, Del Mar, CA WO 20110894.00 A1 7, 2011 (73) Assignee: Kalypsys, Inc., Del Mar, CA (US) OTHER PUBLICATIONS c Khankari et al. Thermochimica Acta 1995, 248, 61-79. (*) Notice: Subject to any disclaimer, the term of this Conalty, M.L. et akl., “Anticancer agents—XII. Pyridazine and patent is extended or adjusted under 35 Benzodiazine derivatives.” Proceedings of the Royal Irish Academy, U.S.C. 154(b) by O days. Section B: Biological, Geological and Chemical Science (1976), 76(10), 151-63. This patent is Subject to a terminal dis- Kim, HS et al., “Synthesis of tetrazolo 1.5-aquinoxalines with anti Ca10. microbial activity,” Journal of the Korean Chemical Society (2001), 45(4), 325-333. (21) Appl. No.: 13/606.947 Smits R. A. et al., “Major advances in the developments of histamine H4 receptor ligands.” Drug Discovery Today, vol. 14, No. 15/16, Aug. (22) Filed: Sep. 7, 2012 2009. Beres M. et al., “Ring Opening of 1.2.3Triazolo 1.5- (65) Prior Publication Data alpha pyrazinium Salts: Synthesis and Some Transformations of a US 2013/0245001A1 Sep.
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