Tri-aryl-substituted-ethane PDE4 inhibitors

1. A pharmaceutical composition comprising a Leukotriene receptor antagonist, a Leukotriene biosynthesis inhibitor, or an M2/M3 antagonist;

a compound represented by Formula (1):

 or a pharmaceutically acceptable salt thereof, wherein

R 1 is C 1-6 alkyl or C 3-6 cycloalkyl, optionally substituted with 1-4 independent halogen;

R 2 is C 1-6 alkyl or C 3-6 cycloalkyl, optionally substituted with 1-4 independent halogen;

R 3 is C 1-4 alkyl, C 3-6 cycloalkyl, heteroaryl, or phenyl, any of which optionally substituted independently with 1-4 independent halogen or C 1-6 alkyl;

R 4 is H or C 1-4 alkyl, said alkyl optionally substituted with 1-4 independent halogen;

R P is H, halogen, nitrile, or a C 1-6 alkyl group, said alkyl optionally substituted with 1-4 independent halogen;

n is 0 or 1; and

when R 3 and R 4 are connected to each other through X, then R 3 and R 4 are each C 1 alkyl, and X is C 0-4 alkyl; and

a pharmaceutically acceptable carrier.

2. A method of treatment or prevention of asthma, chronic bronchitis, chronic obstructive pulmonary disease, eosinophilic granuloma, psoriasis and other benign or malignant proliferative skin diseases, endotoxic shock, laminitis in horses, colic in horses, septic shock, ulcerative colitis, Crohn's disease, reperfusion injury of the myocardium and brain, inflammatory arthritis, chronic glomerulonephritis, atopic dermatitis, urticaria, adult respiratory distress syndrome, infant respiratory distress syndrome, chronic obstructive pulmonary disease in animals, diabetes insipidus, allergic rhinitis, allergic conjunctivitis, vernal conjunctivitis, arterial restenosis, ortherosclerosis, atherosclerosis, neurogenic inflammation, pain, cough, rheumatoid arthritis, ankylosing spondylitis, transplant rejection, graft versus host disease, hypersecretion of gastric acid, bacterial, fungal induced sepsis, viral induced sepsis, fungal induced septic shock, viral induced septic shook, inflammation-mediated chronic tissue degeneration, cytokine-mediated chronic tissue degeneration, osteoarthritis, cancer, cachexia, muscle wasting, depression, memory impairment, tumour growth, or cancerous invasion of normal tissues, osteoporosis, or bone loss, comprising the step of administering a therapeutically effective amount, or a prophylactically effective amount, of a compound represented by Formula (I):

or a pharmaceutically acceptable salt thereof, wherein

R 1 is C 1-6 alkyl or C 3-6 cycloalkyl, optionally substituted with 1-4 independent halogen;

R 2 is C 1-6 alkyl or C 3-6 cycloalkyl, optionally substituted with 1-4 independent halogen;

R 3 is C 1-4 alkyl, C 3-6 cycloalkyl, heteroaryl, or phenyl, any of which optionally substituted independently with 1-4 independent halogen or C 1-6 alkyl;

R 4 is H or C 1-4 alkyl, said alkyl optionally substituted with 1-4 independent halogen;

R P is H, halogen, nitrile, or a C 1-6 alkyl group, said alkyl optionally substituted with 1-4 independent halogen;

n is 0 or 1; and

when R 3 and R 4 are connected to each other through X, then R 3 and R 4 are each C 1 alkyl, and X is C 0-4 alkyl.