# US 7,608,716 B2 · Pyrazolonaphthyridine derivative

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 7,608,716 B2
- Document ID: US7608716B2
- Status: Granted
- Kind: B2
- Application number: 10/533,806
- Filed: 2003-11-05
- Published: 2006-02-23
- Granted: 2009-10-27
- Earliest claimed: 2002-11-06
- Assignees: Aska Pharmaceutical Co., Ltd.
- Inventors: Hashime Kanazawa; Tomoji Aotsuka; Kentarou Kumazawa; Kouki Ishitani; Takashi Nose
- Web page: https://patentgrep.com/patent/US7608716B2

## CPC

- A61K 31/4375: the heterocyclic ring system containing a six-membered ring having nitrogen as a ring heteroatom, e.g. quinolizines, naphthyridines, berberine, vincamine
- A61K 31/444: containing a six-membered ring with nitrogen as a ring heteroatom, e.g. amrinone
- A61P 1/02: Stomatological preparations, e.g. drugs for caries, aphtae, periodontitis
- A61P 1/04: for ulcers, gastritis or reflux esophagitis, e.g. antacids, inhibitors of acid secretion, mucosal protectants
- A61P 1/16: for liver or gallbladder disorders, e.g. hepatoprotective agents, cholagogues, litholytics
- A61P 1/18: for pancreatic disorders, e.g. pancreatic enzymes
- A61P 3/04: Anorexiants; Antiobesity agents
- A61P 3/10: for hyperglycaemia, e.g. antidiabetics
- A61P 5/14: of the thyroid hormones, e.g. T3, T4
- A61P 5/38: of the suprarenal hormones
- A61P 7/00: Drugs for disorders of the blood or the extracellular fluid
- A61P 7/02: Antithrombotic agents; Anticoagulants; Platelet aggregation inhibitors
- A61P 7/06: Antianaemics
- A61P 9/00: Drugs for disorders of the cardiovascular system
- A61P 9/04: Inotropic agents, i.e. stimulants of cardiac contraction; Drugs for heart failure
- A61P 9/10: for treating ischaemic or atherosclerotic diseases, e.g. antianginal drugs, coronary vasodilators, drugs for myocardial infarction, retinopathy, cerebrovascula insufficiency, renal arteriosclerosis
- A61P 9/12: Antihypertensives
- A61P 9/14: Vasoprotectives; Antihaemorrhoidals; Drugs for varicose therapy; Capillary stabilisers
- A61P 11/00: Drugs for disorders of the respiratory system
- A61P 11/02: Nasal agents, e.g. decongestants
- A61P 11/04: for throat disorders
- A61P 11/06: Antiasthmatics
- A61P 11/08: Bronchodilators
- A61P 11/16: Central respiratory analeptics
- A61P 13/02: of urine or of the urinary tract, e.g. urine acidifiers
- A61P 13/08: of the prostate
- A61P 13/10: of the bladder
- A61P 13/12: of the kidneys
- A61P 15/08: for gonadal disorders or for enhancing fertility, e.g. inducers of ovulation or of spermatogenesis
- A61P 15/10: for impotence
- A61P 17/00: Drugs for dermatological disorders
- A61P 17/02: for treating wounds, ulcers, burns, scars, keloids, or the like
- A61P 17/04: Antipruritics
- A61P 17/06: Antipsoriatics
- A61P 17/14: for baldness or alopecia
- A61P 19/02: for joint disorders, e.g. arthritis, arthrosis
- A61P 19/06: Antigout agents, e.g. antihyperuricemic or uricosuric agents
- A61P 21/00: Drugs for disorders of the muscular or neuromuscular system
- A61P 21/02: Muscle relaxants, e.g. for tetanus or cramps
- A61P 21/04: for myasthenia gravis
- A61P 25/00: Drugs for disorders of the nervous system
- A61P 25/04: Centrally acting analgesics, e.g. opioids
- A61P 25/08: Antiepileptics; Anticonvulsants
- A61P 25/16: Anti-Parkinson drugs
- A61P 25/18: Antipsychotics, i.e. neuroleptics; Drugs for mania or schizophrenia
- A61P 25/20: Hypnotics; Sedatives
- A61P 25/22: Anxiolytics
- A61P 25/24: Antidepressants
- A61P 25/28: for treating neurodegenerative disorders of the central nervous system, e.g. nootropic agents, cognition enhancers, drugs for treating Alzheimer's disease or other forms of dementia
- A61P 27/02: Ophthalmic agents
- A61P 27/06: Antiglaucoma agents or miotics
- A61P 27/14: Decongestants or antiallergics
- A61P 27/16: Otologicals
- A61P 29/00: Non-central analgesic, antipyretic or antiinflammatory agents, e.g. antirheumatic agents; Non-steroidal antiinflammatory drugs [NSAID]
- A61P 31/04: Antibacterial agents
- A61P 31/12: Antivirals
- A61P 31/18: for HIV
- A61P 35/00: Antineoplastic agents
- A61P 35/02: specific for leukemia
- A61P 37/00: Drugs for immunological or allergic disorders
- A61P 37/02: Immunomodulators
- A61P 37/06: Immunosuppressants, e.g. drugs for graft rejection
- A61P 37/08: Antiallergic agents (antiasthmatic agents A61P11/06; ophthalmic antiallergics A61P27/14)
- A61P 43/00: Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
- C07D 471/14: Ortho-condensed systems
- A61K: PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES (devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms A61J3/00; chemical aspects of, or use of materials for deodorisation of air, for disinfection or sterilisation, or for bandages, dressings, absorbent pads or surgical articles A61L; soap compositions C11D)
- A61P: SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)

## Abstract

The target is to provide PDE IV inhibitors which have a highly potent anti-asthmatic and/or COPD-prophylactic/therapeutic profile with unexpectedly excellent safety. A compound of the formula (1): wherein A is phenyl, pyridyl, 1-oxypyridyl, or thienyl, which may be unsubstituted or optionally substituted with one or more members selected from the group consisting of hydroxyl, halogen, cyano, nitro, lower alkyl, lower alkoxy, lower alkylcarbonyloxy, amino, carboxyl, lower alkoxycarbonyl, carboxy-lower alkylene, lower alkoxycarbonyl-lower alkylene, lower alkylsulfonyl, lower alkylsulfonylamino, and ureido; R1 is a group selected from the group consisting of hydrogen, hydroxyl, halogen, cyano, nitro, lower alkoxy, amino, carboxyl, and lower alkoxycarbonyl; R2 is hydrogen or lower alkyl; and m is an integer of 1 to 3; or a pharmaceutically acceptable salt thereof, possesses highly excellent PDE IV-specific inhibitory actions and is useful as an anti-asthmatic drug and/or a prophylactic/therapeutic drug for COPD with high safety.

## Claims

### Claim 1

A compound of the formula (1):
wherein:
A is phenyl, which may be unsubstituted or optionally substituted with fluorine;
R1 is hydrogen;
R2 is hydrogen; and
m is 1;
wherein said compound is selected from the group consisting of 3-benzyl-5-phenyl-1H-pyrazolo[4,3-c][1,8]-naphthyridin-4(5H)-one, and 3-(4-fluorobenzyl)-5-phenyl-1H-pyrazolo[4,3-c][1,8]-naphthyridin-4(5H)-one,
or a pharmaceutically acceptable salt thereof.

### Claim 2 (depends on 1)

A pharmaceutical composition which comprises an effective amount of a compound according to claim 1, or a pharmaceutically acceptable salt thereof, in admixture with a pharmaceutically acceptable carrier.