Veliflapon is in clin. development for prevention of myocardial infarction via down-regulation of 5-lipoxygenase activating protein (FLAP), a principle component of the leukotriene B4 pathway.In the spirit of Quality by Design, the synthetic process used for production of the API was investigated by selecting specific unit operations and determining the Critical Process Parameters (CPP).Parameters affecting the crystallization of the API, the final chem. step, and the penultimate chem. step were studied.The penultimate step, a stereoselective alkylation, was studied by Design of Experiment (DOE) and the results indicated that the alkylation step, once suspected of being sterically directed through the use of a chiral-directing menthol ester, may not be.Results from these studies are presented with emphasis on the final crystallization of the API and the DOE on the alkylation step.