Used primarily as an intermediate in the synthesis of pharmaceuticals, particularly in the development of certain antidepressants and psychoactive compounds. It plays a role in the preparation of tricyclic antidepressants due to its ability to form complex ring structures when further alkylated or cyclized. Its chlorinated structure enhances reactivity in cross-coupling and substitution reactions, making it valuable in medicinal chemistry for building nitrogen-containing heterocycles. Also investigated for use in the production of selective serotonin reuptake inhibitors (SSRIs) and related neuroactive agents. Handle with care due to potential alkylating properties and toxicity.