Abstract: The present invention is directed to compounds of Formulas (I, Ia, IIa and IIb). The invention also relates to pharmaceutical compositions comprising compounds of Formulas (I, Ia, IIa and IIb). Methods of making and using the compounds of Formulas (I, Ia, IIa and IIb) are also within the scope of the invention.

Abstract: The present invention is directed to a compound of Formula (I) Formula (I) The invention also relates to pharmaceutical compositions comprising compounds of Formula (I) and methods comprising administering to a subject at least one compound selected from compounds of Formula (I) for treating diseases mediated by P2X7 receptor activity, such as rheumatoid arthritis, osteoarthritis, psoriasis, septic shock, allergic dermatitis, asthma, allergic asthma, mild to severe asthma, steroid resistant asthma, idiopathic pulmonary fibrosis, allergic rhinitis, chronic obstructive pulmonary disease; airway hyper-responsiveness, diseases of the nervous and neuro-immune system, acute and chronic pain states of neuropathic pain, inflammatory pain, spontaneous pain, opioid induced pain, diabetic neuropathy, postherpetic neuralgia, low back pain, chemotherapy-induced neuropathic pain, fibromyalgia, diseases involved with and without neuroinflammation of the central nervous system, mood disorders, major depression, major depress