You might be able to convert C4D files to DWG, when you first export your C4D graphics to DXF in Cinema 4D and then convert DXF to DWG.
Convert CINEMA 4D file format to AutoCAD drawing.
We found 2 software records in the database related to .c4d to .dwg file format conversion.
Microsoft Windows software - convert c4d to dwg on Windows
A CINEMA-4D converter
Convert from c4d file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned c4d to dwg. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A 3D CAD translation softwate