An efficient scalable route to synthesize the enantiomerically pure tert-butyl-(1R,4S,6R)-4-(hydroxymethyl)-3-azabicyclo[4.1.0]heptane-3-carboxylate is described. Compared to the original routes, significant improvements were made by using an innovative approach starting from commercially available chiral lactone. In this approach, one of the key steps described is an elegant epimerization/hydrolysis of the undesired diastereoisomer avoiding tedious purification. The chemistry has been scaled up to produce kilogram amounts of tert-butyl-(1R,4S,6R)-4-(hydroxymethyl)-3azabicyclo[4.1.0]heptane-3-carboxylate in 43% yield over nine chemical transformations.
1-(3-{2-[4-(2-Methyl-5-quinolinyl)-1-piperazinyl]ethyl}phenyl)-2-imidazolidinone, 1, was identified as a potential drug for the treatment of depression and anxiety. Herein is described the work carried out to select the manufacturing route and the process research studies to optimize the key stages of route B. A particular focus is given to the genotoxic impurities, related to this route, as one of the intermediates of the manufacturing route was genotoxic and many genotoxic impurities can be formed in the process. Quality by Design principles were applied for the definition of the control strategy of these impurities.
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