Reaxys does not feature AutoNom and has no plans to do so. This is because tools which can generate an IUPAC name for a given structure are typically available in the structure editors with which Reaxys is compatible with (such as ChemDraw and Symyx Draw). The standard structure editor MarvinSketch from ChemAxon within Reaxys also contains this feature and is accessible through the menu item Tools -> Naming.

Please note: AutoNom is a 3rd party tool owned by the Beilstein Institute.