Used as an intermediate in organic synthesis, particularly in the preparation of nitrogen-containing heterocyclic compounds. It serves in the development of pharmaceuticals where azepine derivatives are key structural motifs, especially in central nervous system agents and bioactive molecules. Its tosyl group facilitates selective reactions, enabling controlled ring transformations and functional group manipulations. Commonly applied in research settings for constructing complex polycyclic frameworks through cyclization, alkylation, or rearrangement reactions.