Commercial Route Development of Sigma-2 Receptor Modulator, CT1812 Leveraging Photoflow, and HTS Technologies
In our recent publication, we present how we developed a second-generation synthesis of CT1812, a sigma-2 receptor modulator (ligand), from readily available starting materials to support late-stage clinical needs. We explain how we replaced an AIBN-induced thermal benzylic bromination in DCE with a visible-light-induced continuous flow process in MeCN operating at room temperature.
To overcome the unexpected challenges encountered in the hydrogenation of alkyne 13 in the penultimate step, the team employed high throughput screening. We explain the rationale for a polymorph switch from the originally developed monofumarate anhydrate to the more thermodynamically stable hemifumarate dihydrate as well. This new convergent route proceeds in eight steps (longest linear sequence (LLS) = 6) compared to the original med chem route (12 steps; LLS = 9), and was successfully demonstrated on a 100 kg scale.
To learn more about the results of this collaboration, please read the full article in Organic Process Research & Development.