LPA receptor antagonist
A compound of the general formula (I) or a non-toxic salt thereof. This compound engages in LPA receptor bonding and antagonism and is useful in the prevention and/or treatment of urinary system disease (symptom with prostatic hypertrophy or neurogenic bladder dysfunction disease, symptom to be caused by spinal cord neoplasm, nucleous hernia, spinal canal stenosis or diabetes, occlusion disease of lower urinary tract, inflammatory disease of lower urinary tract, polyuria), carcinoma-associated disease (solid tumor, solid tumor metastasis, angiofibroma, myeloma, multiple myeloma, Kaposi's sarcoma, leucemia and carcinomatous infiltration transition), proliferative disease (disorder with aberrant angiogenesis, artery obstruction and pulmonary fibrosis), inflammation/immune system disease (psoriasis, nephropathy, hepatitis and pneumonitis symptom), disease caused by secretory dysfunction (Sjogren syndrome), brain-related disease (brain infarction, cerebral apoplexy and brain or peripheral neuropathy) or chronic disease (chronic asthma, glomerulonephritis, obesity, prostate hyperplasia, diseases caused by arteriosclerosis process, rheumatism or atopic dermatitis).
1. A compound represented by the following formula (I-B):
wherein R 1 , R 2 , R 3 and R 4 each independently represents (1) C1-8 alkyl, (2) C2-8 alkenyl, (3) a halogen atom, (4) trihalomethyl, (5) Cycl, (6) —OR 6 , or (7) C1-8 alkyl substituted with —OR 6 or Cycl;
R 6 represents (1) a hydrogen atom, (2) C1-8 alkyl, (3) C2-8 alkenyl, (4) Cycl, (5) methyl substituted with 1 to 3 halogen, or (6) C1-8 alkyl substituted with Cycl;
Cycl represents a C3-10 monocyclic or bicyclic carbocyclic group;
G represents a bond,
K and M each independently represents (1) a bond, (2) C1-8 alkylene, or (3) C2-8 alkenylene;
L represents a bond or an oxygen atom;
Ring A represents a C3-7 monocyclic carbocyclic group;
Ring B represents a C3-10 monocyclic or bicyclic carbocyclic group
Ring D represents a pyrrole, pyrazole, 1,3,4-oxadiazole, thiazole or imidazole ring;
Ring E represents a C6 monocyclic aromatic carbocyclic group;
p, q, r and s each independently represents 0 or an integer of from 1 to 3,
in which R 1 s are the same or different when p represents 2 or more; R 2 s are the same or different when q represents 2 or more; R 3 s are the same or different when r represents 2 or more; and R 4 s are the same or different when s represents 2 or more, respectively;
t represents 0 or 1; and
R 5 represents (1) a hydrogen atom or (2) C1-8 alkyl, or
a salt thereof.
2. A pharmaceutical composition comprising the compound according to claim 1 or a salt thereof and a pharmaceutically acceptable carrier.