VectorWorks is the only program that can reliably export .vwx files and it also supports saving to DWG format, so is obvious choice for this conversion. As far as we know, AutoCAD does not support Nemetschek VectorWorks graphics (.vwx) and same goes to other alternatives.
Convert VectorWorks design file to AutoCAD drawing.
We found one software available in the database for this conversion.
Microsoft Windows software - convert vwx to dwg on Windows
A 3D modeling and rendering tool for Windows
Convert from vwx file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.