4-Cyanocyclohexanone is used to prepare nicotinamides as PDE4 D isoenzymes inhibitors. It is also used as an anthranilic acid replacement in niacin receptor agonist.
Marfat, A., et al.: PCT Int. Appl. (1998), WO 9845268 A1 19981015; Schmidt, D., et al.: Bioorg. Med. Chem. lett., 20, 3426 (2010)