Abstract: To find a compound having a tissue fibrinosis-inhibitory activity and a fibrinolytic activity, and to provide a novel compound that is useful for preventing and/or treating tissue fibrinosis diseases (pulmonary fibrosis, renal fibrosis etc.), diseases caused by pathological blood clots such as ischemic heart diseases (myocardial infarction, angina), intraatrial thrombus, pulmonary embolism, deep venous thrombosis, disseminated intravascular coagulation, ischemic cerebral diseases (cerebral infarction, cerebral bleeding) and arteriosclerosis and the like. To provide a pharmaceutical drug comprising a 5-phenyl-3-pyridazinone derivative represented by the following general formula (I): and an optical isomer thereof, or a pharmaceutically acceptable salt thereof, or a hydrate or solvate thereof, useful for preventing and/or treating disease conditions or symptoms mediated by plasminogen activator inhibitor-1.

Abstract: A pyrazolone derivative represented by formula (I) below: wherein R1 to R3 are the same as defined in claims; or an optical isomer, a pharmaceutically acceptable salt thereof, or a hydrate or solvate thereof is provided. The novel pyrazolone derivative according to the present invention has a PAI-1 production inhibitory activity, a tissue fibrosis inhibitory activity, and a fibrolytic activity, and is effective for preventing and/or treating tissue fibrotic diseases (lung fibrosis, kidney fibrosis, etc.) and diseases of which a pathological thrombus becomes the cause, such as ischemic cardiac diseases (cardiac infarction and angina pectoris), atrial thrombus, lung embolism, deep thrombophlebitis, disseminated intravascular clotting, ischemic brain diseases (brain infarction, brain hemorrhage), and arterial sclerosis.

Abstract: To find a compound having a tissue fibrinosis-inhibitory activity and a fibrinolytic activity, and to provide a novel compound that is useful for preventing and/or treating tissue fibrinosis diseases (pulmonary fibrosis, renal fibrosis etc.), diseases caused by pathological blood clots such as ischemic heart diseases (myocardial infarction, angina), intraatrial thrombus, pulmonary embolism, deep venous thrombosis, disseminated intravascular coagulation, ischemic cerebral diseases (cerebral infarction, cerebral bleeding) and arteriosclerosis and the like. To provide a pharmaceutical drug comprising a 5-phenyl-3-pyridazinone derivative represented by the following general formula (I): and an optical isomer thereof, or a pharmaceutically acceptable salt thereof, or a hydrate or solvate thereof, useful for preventing and/or treating disease conditions or symptoms mediated by plasminogen activator inhibitor-1.

Abstract: A 2-phenylmorpholin-5-one derivative having the formula (I): wherein R1 represents a C1 to C8 alkyl group, a C3 to C7 cycloalkyl group or an indanyl group, R2 represents a C1 to C4 alkyl group, R3 represents a hydrogen atom, a C1 to C5 alkyl group, etc., R4 represents a hydrogen atom, a C1 to C6 alkyl group, etc., R5, R6 represent a hydrogen atom, a C1 to C5 alkyl group, etc., an optical isomer thereof or a pharmacologically acceptable salt thereof, or a hydrate or solvate thereof and a pharmaceutical composition containing the same. The above compound has a strong type IV phosphodiesterase (PDE) inhibitory activity and has bronchodilater and antiinflammatory effects.

Abstract: A 6-phenyltetrahydro-1,3-oxazin-2-one derivative having the formula (I): wherein, R1 is an unsubstituted or substituted C1 to C8 alkyl group; an unsubstituted or substituted C3 to C7 cycloalkyl group;, etc., R2 is a C1 to C4 alkyl group, R3 is H; an unsubstituted or substituted C1 to C5 alkyl group; etc., R4 is H; an unsubstituted or substituted C1 to C6 alkyl group, and R5 and R6 are independently a hydrogen atom; an unsubstituted or substituted C1 to C5 alkyl group; etc. an optical isomer thereof, or a pharmacologically acceptable salt thereof, or a hydrate or a solvate thereof and pharmaceutical compositions containing the same, in particular a drug for the prevention or treatment of inflammatory diseases and a drug for asthma. The above 6-phenyltetrahydro-1,3-oxazin-2-one derivative has a strong type IV PDE inhibitory activity and has a bronchiodilator and antiinflammatory effects.

Abstract: A 3-anilino-2-cycloalkenone derivative of the formula (I): wherein, R1 represents a C1 to C8 alkyl group, which may have a substituent, except for a methyl group, a C3 to C7 cycloalkyl group, a 3-tetrahydrofuryl group, an 2-indanyl group, etc., R2 represents a C1 to C4 alkyl group, R3 represents a hydrogen atom, a C3 to C7 alkyl group, which may have a substituent, a C3 to C7 cycloalkyl group, etc., R4 represents a hydrogen atom, a C1 to C5 alkyl group, which may have a substituent, a halogen atom, etc., R5, R6, R7, and R8 independently represent a hydrogen atom, a C1 to C5 alkyl group, which may have a substituent, etc., X represents —(CR11R12)n—, wherein n is 0 to 2, R11 and R12 independently represent a hydrogen atom, a C1 to C5 alkyl group, which may have a substituent, etc.

Abstract: A 5-phenyl-3-pyridazinone derivative having the formula (I) wherein R1 represents an unsubstituted or substituted C1 to C8 alkyl group, C3 to C7 cycloalkyl group, or indanyl group; R2 represents a C1 to C4 alkyl group; R3 represents a hydrogen atom or an unsubstituted or substituted C1 to C5 alkyl group; a C3 to C7 cycloalkyl group; or an aryl group which may contain a heteroatom; R4 and R5 independently represent a hydrogen atom, C1 to C6 alkyl group, an unsubstituted or substituted phenyl, or a monocyclic aryl group which may contain a heteroatom; a dotted line represents a single or double bond, provided that when the dotted line represents a single bond; R6 represents a hydrogen atom or C1 to C6 alkyl group.