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Process chemistry, the practice of scaling up chemical production from gram and kilograms to thousands of gallons while always of vital importance, has lately become a highly visible enterprise in the pharmaceutical sector.In the pharmaceutical industry, once the medicinal chemist defines the target molecule, the process chemist finds the most efficient, economical and safe route to make the molecule and its analogues.The process for the preparation of the BPH candidate, Finasteride will be discussed.We will discuss how the process for pharmaceutical drug development evolved from discovery to commercialization using aza-steroid as a template.The key process involved the introduction of a double bond in the aza steroid via a novel silicon mediated quinine oxidation.The mechanism of the quinine oxidation as well as the process development studies of the quinine oxidation will be discussed.