Would it be in the interest of Persia if they got access to the Black Sea (preferable by capturing Georgia) somewhere in the 1740's (because Nader Shah is Mary Tzu)? I don't know how effectively the Ottomans made use of the port of Basra for their trade.
Also, how long would it take before the Russians would take it?
Edit: Post-1500 TL is also plausible