Synthesis and Biological Evaluation of 4-Bromo-dimethyltryptamine (4-Br-DMT): A Synthetic Building Block for Future Analog Development.

The ongoing psychedelic renaissance has prompted a renewed search for novel drugs based on modifying existing psychedelic motifs. In this study, a synthesis of 4-bromo--dimethyltryptamine (4-Br-DMT) was achieved and used as a late-stage intermediate for analog development. Specifically, we were able to synthesize and access novel molecules by forming carbon-carbon bonds at the C4 position using palladium cross-coupling reactions. Using the synthetic route described here will facilitate the rapid development of a library of tryptamines with novel 4-position substitutions to investigate structure-activity relationships (SARs) with serotonergic targets. Furthermore, the pharmacological target profile and biological effects of 4-Br-DMT were compared to the 4-hydroxy-,-dimethyltryptamine (psilocin) and nonring-substituted analog,,-dimethyltryptamine (DMT). Overall, the data indicate that 4-Br-DMT has a serotonergic profile without psychedelic-like effects in mice but has a reduced safety profile compared to psilocin and DMT.