I want to adapt a VFD
If your single phase is 230V then your 3ph isn't going to be 415V - it'll be 398V. OK back to the question - on the basis that you haven't specified which variable frequency drive I'd strongly advise against it because the smoothing capacitor inside the VFD will not be able to cope. This is what 3ph looks like rectified (no smoothing cap): -



Notice that the ripple voltage is very small (red) - now for comparison, here's what single phase looks like rectified: -



Notice that the single phase that is full wave rectified will inevitably drop down to 0V every half cycle and will need an appropriately sized capacitor to keep the ripple voltage low between peaks of the AC. This isn't needed on a 3ph VFD and, even if it had one, it would be no good for smoothing a single phase because it would be far too low in value to hold up the supply between half cycles.