Is it possible to run Leopard on late 2011 Macbook Pro
General rule is no Mac can run an OS older than itself. There are no drivers for hardware that wasn't yet invented. The 2011 Macbook Pro runs OS X 10.7.2 at minimum.
You could normally run an older OS in a VM, but Leopard isn't licensed for virtualisation (see What are the technical and license restrictions around virtualization for Leopard, Snow Leopard and Lion?).