The present invention provides a novel synthesis of verubecestat, and two novel crystalline forms of verubecestat, as well as pharmaceutically acceptable compositions thereof, each of which may be useful in treating, preventing, ameliorating, and/or delaying the onset of an Aβ pathology and/or a symptom or symptoms thereof. Non-limiting examples of such Aβ pathologies, including Alzheimer's disease, are disclosed herein.
