N4-Methylpyridine-3,4-diamine is primarily utilized in the synthesis of various pharmaceutical compounds. It serves as a key intermediate in the production of drugs targeting neurological disorders, particularly those involving dopamine regulation. Its structural properties make it suitable for developing inhibitors of specific enzymes, which are crucial in treating conditions like Parkinson's disease. Additionally, it is employed in organic synthesis to create complex molecules for research in medicinal chemistry, aiding in the discovery of new therapeutic agents.