Phthalazine compounds and therapeutic agents for erectile dysfunction

• Main Authors: MIYAZAKI KAZUKI, NAGAKURA TADASHI, NAOE YOSHIMITSU, KARIBE NORIO, OZAKI FUMIHIRO, ADACHI HIDEYUKI, WATANABE NOBUHISA, KANEKO TOSHIHIKO, ISHIHARA HIROKI, MIYAZAWA SHUHEI, KAMADA ATSUSHI, TSUKADA ITARU, KODAMA KOHTAROU
• Format: Patent
• Language: English
• Published: 05.06.2003
• Edition: 7
• Subjects: CHEMISTRY; HETEROCYCLIC COMPOUNDS; HUMAN NECESSITIES; HYGIENE; MEDICAL OR VETERINARY SCIENCE; METALLURGY; ORGANIC CHEMISTRY; PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES; SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS ORMEDICINAL PREPARATIONS

The present invention provides a phthalazine compound as a therapeutic agent for erectile dysfunction represented by the following formula, a pharmacologically acceptable salt thereof or a hydrate thereof: wherein R1 and R2 are the same as or different from each other and represent a halogen atom, a C1 to C4 alkyl group which may be substituted with a halogen atom, a C1 to C4 alkoxy group which may be substituted with a halogen atom or a cyano group; X represents a cyano group, a nitro group, a halogen atom, a hydroxyimino group which may be substituted or a heteroaryl group which may be substituted; Y represents a heteroaryl group, an aryl group which may be substituted, an alkynyl group which may substituted, an alkenyl group, an alkyl group, an optionally substituted saturated or unsaturated 4- to 8-membered amine ring, and the cyclic amine compound is a monocyclic compound, bicyclic compound or a spiro compound; l is an integer of 1 to 3; provided that the case where l is 1 or 2, X is a cyano group, a nitro group or a chlorine atom, R1 is a chlorine atom, R2 is a methoxy group and Y is a 5- or 6-memberred amine ring substituted with a hydroxyl group is excluded.