Provided herein are novel processes and methods for making 4-[(3-[(4-cyclopropylcarbonyl)piperazin-1-yl]carbonyl)-4-fluorophenyl]methyl(2H)phthalazin-1-one (Olaparib) and intermediates thereof. Olaparib is a poly ADP ribose polymerase (PARP) inhibitor useful in the treatment of cancers. Benefits of the present disclosure include the use of less toxic compounds and improved yields.
