If you look at the Hotels Chart, you’ll notice the only transfer partner to Hilton is Amex which already can be converted to Hilton Honors at 2.0 rate, but there is a way to do the same with Citi or Chase points. Personally I don’t think this is a good way to spend points, but if you have to do it for some reason, here is how you can.
Transfer your points to Virgin Atlantic. Call Virgin to transfer points to Hilton, they do it at 1.5 rate.
If you do this during Citi (or Amex) VA bonus transfer window, you can get even better rate: 1.87-1.95 Hilton points instead of 1.5