Novel Azaandrostane Derivatives for the Synthesis of 17β-(N-tert-butyl Carbamoyl)-4-aza-5α-androst-1-ene-3-one

The document reported a new industrially viable process for synthesizing finasteride, a compound used in hair loss treatment, from novel azaandrostane derivatives. The process utilized a benzoyl group as a novel protecting group for the lactamic NH group. The structures of the newly prepared compounds were confirmed using spectral data, including IR, 1H-NMR, and MS.