Total Synthesis of Rucaparib.

A concise total synthesis of rucaparib, an FDA-approved drug for ovarian and prostate cancers, is reported. The Heck reaction of the commercially available aryl iodide with acrylonitrile provided the desired ( E )-2-aminocinnamonitrile derivative. A subsequent imino-Stetter reaction of the aldimine derived from 2-aminocinnamonitrile and aldehyde furnished indole-3-acetonitrile bearing the desired substituents at appropriate positions. The construction of the final azepinone scaffold via reduction of the nitrile group followed by seven-membered lactamization afforded rucaparib. Notably, the synthesis of rucaparib is achieved using commercially available starting materials in only three separation operations with 54% overall yield.