Qatar airway award tix using United miles (downgrade from first to business)

I booked qatar airway flight using united miles. (sfo-fra-doh). (sfo-fra united first) (fra-doh quatar first)

fra-doh segment segment was downgrade to business class due to aircraft change (new 788 flight doesn't have first class seat)

does anyone know if i can get any kind of compensation from qatar airways?

(note: qatar and united are no longer partner)