If you are putting this indoors, I would highly suggest that you search for a transition fitting like the ones below. I would never put a normal pvc to copper threaded joint indoors. Also, keep in mind that PVC is usually not permitted (by code) to be used indoors.
The easiest would be to go with a pushfit type connection. This would transition from PVC (Iron Pipe Size) to Copper (Copper tube size). Cash Acme, or Sharkbite makes this fitting.
Sioux Chief makes transition fittings that I would also feel more comfortable with…
Sweat x PVC glue (this would be my ideal choice)
Male thread x PVC glue (would require a copper male adapter sweated in at some point.
