The present invention is directed to the compounds of Formula I which are inhibitors of tropomyosin-related kinase A (TrkA): Formula (I) or stereoisomers, tautomers or a pharmaceutically acceptable salts, metabolites, isotopes, solvates or prodrugs thereof, wherein, Ra, Rb, Rc, Rd, R1, R2, L and Het-Ar are as defined herein. These compounds can be used for the preventive and/or therapeutic treatment of diseases or disorders associated with abnormal activities of nerve growth factor (NGF) receptor TrkA such as Pain, inflammation or an inflammatory diseases, Cancer, atherosclerosis, restenosis, thrombosis, Neurodegenerative diseases, Erectile Dysfunction (ED), Skin disorders, Autoimmune disease like Multiple sclerosis, Sjögren's syndrome, endometriosis, diabetic peripheral neuropathy, prostatitis, Infectious diseases, diseases related to an imbalance of the regulation of bone remodeling, endometriosis, pelvic pain syndrome and diseases resulting from abnormal tissue remodelling and fibrotic disorders； or a disease, disorder, injury, or malfunction relating to dysmyelination or demyelination.
