I'm not sure why a war would take place, maybe relating to the attempts to starve Britain, or Napoleon's ego leads him to want to control more of the world, or he wants to recreate Rome, whatever the reason. If say he retains Russia as an ally and launches the invasion around 1812, or that he defeated Russia decisively in the 1812-13 time period and invades afterwards at the peak of his power.
Could the Ottoman Empire resist a total conquest of their European land, or could France even take the fight to the Middle East?