Continuous flow synthesis of <i>N</i>,<i>N</i>-dimethyltryptamine (DMT) analogues with therapeutic potential

Herein, we describe the continuous flow synthesis and in-line extraction of <i>N</i>,<i>N</i>-dimethyltryptamine (DMT) and several of its analogues using a Fischer indole reaction, along with a larger gram scale synthesis (4.75 g) of the model compound. These products could then be quickly transformed into their respective fumarate salts, making them easier to handle and stable for long time storage using a straightforward batch procedure. Additionally, the commercially available drug rizatriptan benzoate could be synthesised with high purity using this setup. The presented method employs relatively green solvents both for the synthesis and purification of the target products.